RPS-BLAST 2.2.26 [Sep-21-2011]
Database: CDD.v3.10
44,354 sequences; 10,937,602 total letters
Searching..................................................done
Query= psy10225
(207 letters)
>gnl|CDD|212795 cd11861, SH3_DLG-like, Src Homology 3 domain of Disks large
homolog proteins. The DLG-like proteins are
scaffolding proteins that cluster at synapses and are
also called PSD (postsynaptic density)-95 proteins or
SAPs (synapse-associated proteins). They play important
roles in synaptic development and plasticity, cell
polarity, migration and proliferation. They are members
of the MAGUK (membrane-associated guanylate kinase)
protein family, which is characterized by the presence
of a core of three domains: PDZ, SH3, and guanylate
kinase (GuK). The GuK domain in MAGUK proteins is
enzymatically inactive; instead, the domain mediates
protein-protein interactions and associates
intramolecularly with the SH3 domain. DLG-like proteins
contain three PDZ domains and varying N-terminal
regions. All DLG proteins exist as
alternatively-spliced isoforms. Vertebrates contain
four DLG proteins from different genes, called DLG1-4.
DLG4 and DLG2 are found predominantly at postsynaptic
sites and they mediate surface ion channel and receptor
clustering. DLG3 is found axons and some presynaptic
terminals. DLG1 interacts with AMPA-type glutamate
receptors and is critical in their maturation and
delivery to synapses. The SH3 domain of DLG4 binds and
clusters the kainate subgroup of glutamate receptors
via two proline-rich sequences in their C-terminal
tail. It also binds AKAP79/150 (A-kinase anchoring
protein). SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 61
Score = 130 bits (328), Expect = 9e-40
Identities = 43/61 (70%), Positives = 55/61 (90%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
+ RALFDYDP++D GLPS+GL F +GDILHVTNASDDEWWQARRV P+G+E+ +G++PSK
Sbjct: 1 YVRALFDYDPSRDSGLPSQGLSFKFGDILHVTNASDDEWWQARRVTPNGEEEEVGVIPSK 60
Query: 79 K 79
+
Sbjct: 61 R 61
>gnl|CDD|212965 cd12032, SH3_DLG2, Src Homology 3 domain of Disks Large homolog
2. DLG2, also called postsynaptic density-93 (PSD93)
or Channel-associated protein of synapse-110 (chapsyn
110), is a scaffolding protein that clusters at
synapses and plays an important role in synaptic
development and plasticity. The DLG2 delta isoform
binds inwardly rectifying potassium Kir2 channels,
which determine resting membrane potential in neurons.
It regulates the spatial and temporal distribution of
Kir2 channels within neuronal membranes. DLG2 is a
member of the MAGUK (membrane-associated guanylate
kinase) protein family, which is characterized by the
presence of a core of three domains: PDZ, SH3, and
guanylate kinase (GuK). The GuK domain in MAGUK
proteins is enzymatically inactive; instead, the domain
mediates protein-protein interactions and associates
intramolecularly with the SH3 domain. DLG2 contains
three PDZ domains. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 74
Score = 112 bits (281), Expect = 9e-33
Identities = 46/68 (67%), Positives = 57/68 (83%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
+ RA+FDY+ +KD GLPS+GL F YGDILHV NASDDEWWQARRV P GD + +G++PSK
Sbjct: 7 YVRAMFDYEKSKDSGLPSQGLSFRYGDILHVINASDDEWWQARRVTPDGDSEEMGVIPSK 66
Query: 79 KRWERKQR 86
+R ERK+R
Sbjct: 67 RRVERKER 74
>gnl|CDD|212964 cd12031, SH3_DLG1, Src Homology 3 domain of Disks Large homolog
1. DLG1, also called synapse-associated protein 97
(SAP97), is a scaffolding protein that clusters at
synapses and plays an important role in synaptic
development and plasticity. DLG1 plays roles in
regulating cell polarity, proliferation, migration, and
cycle progression. It interacts with AMPA-type
glutamate receptors and is critical in their maturation
and delivery to synapses. It also interacts with
PKCalpha and promotes wound healing. DLG1 is a member
of the MAGUK (membrane-associated guanylate kinase)
protein family, which is characterized by the presence
of a core of three domains: PDZ, SH3, and guanylate
kinase (GuK). The GuK domain in MAGUK proteins is
enzymatically inactive; instead, the domain mediates
protein-protein interactions and associates
intramolecularly with the SH3 domain. DLG1 contains
three PDZ domains. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 67
Score = 102 bits (255), Expect = 7e-29
Identities = 43/64 (67%), Positives = 52/64 (81%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
+ RALFDYD TKD GLPS+GL F +GDILHV NASDDEWWQAR+V G+ + IG++PSK
Sbjct: 4 YVRALFDYDKTKDSGLPSQGLNFKFGDILHVVNASDDEWWQARQVTADGESEEIGVIPSK 63
Query: 79 KRWE 82
+R E
Sbjct: 64 RRVE 67
>gnl|CDD|212962 cd12029, SH3_DLG3, Src Homology 3 domain of Disks Large homolog
3. DLG3, also called synapse-associated protein 102
(SAP102), is a scaffolding protein that clusters at
synapses and plays an important role in synaptic
development and plasticity. Mutations in DLG3 cause
midgestational embryonic lethality in mice and may be
associated with nonsyndromic X-linked mental
retardation in humans. It interacts with the NEDD4
(neural precursor cell-expressed developmentally
downregulated 4) family of ubiquitin ligases and
promotes apical tight junction formation. DLG3 is a
member of the MAGUK (membrane-associated guanylate
kinase) protein family, which is characterized by the
presence of a core of three domains: PDZ, SH3, and
guanylate kinase (GuK). The GuK domain in MAGUK
proteins is enzymatically inactive; instead, the domain
mediates protein-protein interactions and associates
intramolecularly with the SH3 domain. DLG3 contains
three PDZ domains. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 67
Score = 99.0 bits (246), Expect = 2e-27
Identities = 44/64 (68%), Positives = 51/64 (79%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
+ RALFDYD T+D LPS+GL F YGDILHV NASDDEWWQAR V P G+ + IG++PSK
Sbjct: 4 YVRALFDYDRTRDSCLPSQGLSFSYGDILHVINASDDEWWQARLVTPHGESEQIGVIPSK 63
Query: 79 KRWE 82
KR E
Sbjct: 64 KRVE 67
>gnl|CDD|212963 cd12030, SH3_DLG4, Src Homology 3 domain of Disks Large homolog
4. DLG4, also called postsynaptic density-95 (PSD95)
or synapse-associated protein 90 (SAP90), is a
scaffolding protein that clusters at synapses and plays
an important role in synaptic development and
plasticity. It is responsible for the membrane
clustering and retention of many transporters and
receptors such as potassium channels and PMCA4b, a
P-type ion transport ATPase, among others. DLG4 is a
member of the MAGUK (membrane-associated guanylate
kinase) protein family, which is characterized by the
presence of a core of three domains: PDZ, SH3, and
guanylate kinase (GuK). The GuK domain in MAGUK
proteins is enzymatically inactive; instead, the domain
mediates protein-protein interactions and associates
intramolecularly with the SH3 domain. DLG4 contains
three PDZ domains. The SH3 domain of DLG4 binds and
clusters the kainate subgroup of glutamate receptors
via two proline-rich sequences in their C-terminal
tail. It also binds AKAP79/150 (A-kinase anchoring
protein). SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 66
Score = 93.8 bits (233), Expect = 1e-25
Identities = 36/64 (56%), Positives = 46/64 (71%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
+ RALFDYD TKD G S+ L F +GD+LHV +A D+EWWQARRV + + IG +PSK
Sbjct: 3 YIRALFDYDKTKDCGFLSQALSFRFGDVLHVIDAGDEEWWQARRVHSDSETEEIGFIPSK 62
Query: 79 KRWE 82
+R E
Sbjct: 63 RRVE 66
>gnl|CDD|212796 cd11862, SH3_MPP, Src Homology 3 domain of Membrane Protein,
Palmitoylated (or MAGUK p55 subfamily member) proteins.
The MPP/p55 subfamily of MAGUK (membrane-associated
guanylate kinase) proteins includes at least eight
vertebrate members (MPP1-7 and CASK), four Drosophila
proteins (Stardust, Varicose, CASK and Skiff), and
other similar proteins; they all contain one each of
the core of three domains characteristic of MAGUK
proteins: PDZ, SH3, and guanylate kinase (GuK). In
addition, most members except for MPP1 contain
N-terminal L27 domains and some also contain a Hook
(Protein 4.1 Binding) motif in between the SH3 and GuK
domains. CASK has an additional calmodulin-dependent
kinase (CaMK)-like domain at the N-terminus. Members of
this subfamily are scaffolding proteins that play
important roles in regulating and establishing cell
polarity, cell adhesion, and synaptic targeting and
transmission, among others. The GuK domain in MAGUK
proteins is enzymatically inactive; instead, the domain
mediates protein-protein interactions and associates
intramolecularly with the SH3 domain. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 61
Score = 81.1 bits (201), Expect = 1e-20
Identities = 32/63 (50%), Positives = 40/63 (63%), Gaps = 6/63 (9%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIV 75
F RALFDYDP +D +P + GL F GDIL + N D WWQAR+V GD G G++
Sbjct: 1 FVRALFDYDPEEDPLIPCKEAGLSFKKGDILQIVNQDDPNWWQARKV---GDPNGRAGLI 57
Query: 76 PSK 78
PS+
Sbjct: 58 PSQ 60
>gnl|CDD|212968 cd12035, SH3_MPP1-like, Src Homology 3 domain of Membrane
Protein, Palmitoylated 1 (or MAGUK p55 subfamily member
1)-like proteins. This subfamily includes MPP1, CASK
(Calcium/calmodulin-dependent Serine protein Kinase),
Caenorhabditis elegans lin-2, and similar proteins.
MPP1 and CASK are scaffolding proteins from the MAGUK
(membrane-associated guanylate kinase) protein family,
which is characterized by the presence of a core of
three domains: PDZ, SH3, and guanylate kinase (GuK). In
addition, they also have the Hook (Protein 4.1 Binding)
motif in between the SH3 and GuK domains. The GuK
domain in MAGUK proteins is enzymatically inactive;
instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. CASK and lin-2 also contain an N-terminal
calmodulin-dependent kinase (CaMK)-like domain and two
L27 domains. MPP1 is ubiquitously-expressed and plays
roles in regulating neutrophil polarity, cell shape,
hair cell development, and neural development and
patterning of the retina. CASK is highly expressed in
the mammalian nervous system and plays roles in
synaptic protein targeting, neural development, and
gene expression regulation. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 62
Score = 70.9 bits (174), Expect = 1e-16
Identities = 27/61 (44%), Positives = 38/61 (62%), Gaps = 4/61 (6%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+ RA FDYDP+KDD +P + G+ F GDIL + + D WWQAR P ++ G++P
Sbjct: 1 YVRAQFDYDPSKDDLIPCQQAGIAFKTGDILQIISKDDHNWWQAR--KPGASKEPAGLIP 58
Query: 77 S 77
S
Sbjct: 59 S 59
>gnl|CDD|212969 cd12036, SH3_MPP5, Src Homology 3 domain of Membrane Protein,
Palmitoylated 5 (or MAGUK p55 subfamily member 5).
MPP5, also called PALS1 (Protein associated with Lin7)
or Nagie oko protein in zebrafish or Stardust in
Drosophila, is a scaffolding protein which associates
with Crumbs homolog 1 (CRB1), CRB2, or CRB3 through its
PDZ domain and with PALS1-associated tight junction
protein (PATJ) or multi-PDZ domain protein 1 (MUPP1)
through its L27 domain. The resulting tri-protein
complexes are core proteins of the Crumb complex, which
localizes at tight junctions or subapical regions, and
is involved in the maintenance of apical-basal polarity
in epithelial cells and the morphogenesis and function
of photoreceptor cells. MPP5 is critical for the proper
stratification of the retina and is also expressed in T
lymphocytes where it is important for TCR-mediated
activation of NFkB. Drosophila Stardust exists in
several isoforms, some of which show opposing functions
in photoreceptor cells, which suggests that the
relative ratio of different Crumbs complexes regulates
photoreceptor homeostasis. MPP5 contains two L27
domains followed by the core of three domains
characteristic of MAGUK (membrane-associated guanylate
kinase) proteins: PDZ, SH3, and guanylate kinase (GuK).
In addition, it also contains the Hook (Protein 4.1
Binding) motif in between the SH3 and GuK domains. The
GuK domain in MAGUK proteins is enzymatically inactive;
instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 63
Score = 69.7 bits (171), Expect = 3e-16
Identities = 31/63 (49%), Positives = 36/63 (57%), Gaps = 8/63 (12%)
Query: 21 RALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG---IGIV 75
RA FDYDP D +P R GL F GDILHV + D WWQA R G+E G++
Sbjct: 3 RAHFDYDPEDDPYIPCRELGLSFQKGDILHVISQEDPNWWQAYR---EGEEDNQSLAGLI 59
Query: 76 PSK 78
PSK
Sbjct: 60 PSK 62
>gnl|CDD|213013 cd12080, SH3_MPP1, Src Homology 3 domain of Membrane Protein,
Palmitoylated 1 (or MAGUK p55 subfamily member 1).
MPP1, also called 55 kDa erythrocyte membrane protein
(p55), is a ubiquitously-expressed scaffolding protein
that plays roles in regulating neutrophil polarity,
cell shape, hair cell development, and neural
development and patterning of the retina. It was
originally identified as an erythrocyte protein that
stabilizes the actin cytoskeleton to the plasma
membrane by forming a complex with 4.1R protein and
glycophorin C. MPP1 is one of seven vertebrate homologs
of the Drosophila Stardust protein, which is required
in establishing cell polarity, and it contains the
three domains characteristic of MAGUK
(membrane-associated guanylate kinase) proteins: PDZ,
SH3, and guanylate kinase (GuK). In addition, it also
contains the Hook (Protein 4.1 Binding) motif in
between the SH3 and GuK domains. The GuK domain in
MAGUK proteins is enzymatically inactive; instead, the
domain mediates protein-protein interactions and
associates intramolecularly with the SH3 domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 62
Score = 64.6 bits (157), Expect = 3e-14
Identities = 26/61 (42%), Positives = 36/61 (59%), Gaps = 4/61 (6%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+ RA FDYDP KD+ +P + GL F GDI+ + N D WWQ R + E+ G++P
Sbjct: 1 YMRAQFDYDPKKDNLIPCKEAGLKFQTGDIIQIINKDDSNWWQGR--VEGSGEESAGLIP 58
Query: 77 S 77
S
Sbjct: 59 S 59
>gnl|CDD|212972 cd12039, SH3_MPP3, Src Homology 3 domain of Membrane Protein,
Palmitoylated 3 (or MAGUK p55 subfamily member 3).
MPP3 is a scaffolding protein that colocalizes with
MPP5 and CRB1 at the subdpical region adjacent to
adherens junctions and may function in photoreceptor
polarity. It interacts with some nectins and regulates
their trafficking and processing. Nectins are cell-cell
adhesion proteins involved in the establishment
apical-basal polarity at cell adhesion sites. It is one
of seven vertebrate homologs of the Drosophila Stardust
protein, which is required in establishing cell
polarity, and it contains two L27 domains followed by
the core of three domains characteristic of MAGUK
(membrane-associated guanylate kinase) proteins: PDZ,
SH3, and guanylate kinase (GuK). The GuK domain in
MAGUK proteins is enzymatically inactive; instead, the
domain mediates protein-protein interactions and
associates intramolecularly with the SH3 domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 62
Score = 61.1 bits (148), Expect = 5e-13
Identities = 31/64 (48%), Positives = 40/64 (62%), Gaps = 6/64 (9%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQ-GIGIV 75
F RALFDY+P +D +P + GLPF DIL V + D WWQA+RV GD G++
Sbjct: 1 FMRALFDYNPYEDRAIPCQEAGLPFKRRDILEVVSQDDPTWWQAKRV---GDTNLRAGLI 57
Query: 76 PSKK 79
PSK+
Sbjct: 58 PSKQ 61
>gnl|CDD|213014 cd12081, SH3_CASK, Src Homology 3 domain of
Calcium/calmodulin-dependent Serine protein Kinase.
CASK is a scaffolding protein that is highly expressed
in the mammalian nervous system and plays roles in
synaptic protein targeting, neural development, and
gene expression regulation. CASK interacts with many
different binding partners including parkin, neurexin,
syndecans, calcium channel proteins, caskin, among
others, to perform specific functions in different
subcellular locations. Disruption of the CASK gene in
mice results in neonatal lethality while mutations in
the human gene have been associated with X-linked
mental retardation. Drosophila CASK is associated with
both pre- and postsynaptic membranes and is crucial in
synaptic transmission and vesicle cycling. CASK
contains an N-terminal calmodulin-dependent kinase
(CaMK)-like domain, two L27 domains, followed by the
core of three domains characteristic of MAGUK
(membrane-associated guanylate kinase) proteins: PDZ,
SH3, and guanylate kinase (GuK). In addition, it also
contains the Hook (Protein 4.1 Binding) motif in
between the SH3 and GuK domains. The GuK domain in
MAGUK proteins is enzymatically inactive; instead, the
domain mediates protein-protein interactions and
associates intramolecularly with the SH3 domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 62
Score = 59.5 bits (144), Expect = 2e-12
Identities = 24/61 (39%), Positives = 34/61 (55%), Gaps = 4/61 (6%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+ RA F+YDP KDD +P + G+ F GDIL + + D WWQA+ G++P
Sbjct: 1 YVRAQFEYDPLKDDLIPCKQAGIRFRVGDILQIISKDDHNWWQAKLENSKNGTA--GLIP 58
Query: 77 S 77
S
Sbjct: 59 S 59
>gnl|CDD|212966 cd12033, SH3_MPP7, Src Homology 3 domain of Membrane Protein,
Palmitoylated 7 (or MAGUK p55 subfamily member 7).
MPP7 is a scaffolding protein that binds to DLG1 and
promotes tight junction formation and epithelial cell
polarity. Mutations in the MPP7 gene may be associated
with the pathogenesis of diabetes and extreme bone
mineral density. It is one of seven vertebrate homologs
of the Drosophila Stardust protein, which is required
in establishing cell polarity, and it contains two L27
domains followed by the core of three domains
characteristic of MAGUK (membrane-associated guanylate
kinase) proteins: PDZ, SH3, and guanylate kinase (GuK).
The GuK domain in MAGUK proteins is enzymatically
inactive; instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 61
Score = 57.0 bits (137), Expect = 2e-11
Identities = 27/63 (42%), Positives = 37/63 (58%), Gaps = 6/63 (9%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQ-GIGIV 75
F +ALFDY+P +D +P + GL F GDIL + + D WWQA+ GD G++
Sbjct: 1 FIKALFDYNPNEDKAIPCKEAGLSFKKGDILQIMSQDDATWWQAKH---EGDANPRAGLI 57
Query: 76 PSK 78
PSK
Sbjct: 58 PSK 60
>gnl|CDD|212967 cd12034, SH3_MPP4, Src Homology 3 domain of Membrane Protein,
Palmitoylated 4 (or MAGUK p55 subfamily member 4).
MPP4, also called Disks Large homolog 6 (DLG6) or
Amyotrophic lateral sclerosis 2 chromosomal region
candidate gene 5 protein (ALS2CR5), is a
retina-specific scaffolding protein that plays a role
in organizing presynaptic protein complexes in the
photoreceptor synapse, where it localizes to the plasma
membrane. It is required in the proper localization of
calcium ATPases and for maintenance of calcium
homeostasis. MPP4 is one of seven vertebrate homologs
of the Drosophila Stardust protein, which is required
in establishing cell polarity, and it contains two L27
domains followed by the core of three domains
characteristic of MAGUK (membrane-associated guanylate
kinase) proteins: PDZ, SH3, and guanylate kinase (GuK).
The GuK domain in MAGUK proteins is enzymatically
inactive; instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 61
Score = 56.4 bits (136), Expect = 3e-11
Identities = 24/61 (39%), Positives = 35/61 (57%), Gaps = 4/61 (6%)
Query: 19 FSRALFDYDPTKDDGLP--SRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+ RA+ DY P +D +P GLPF GDIL + + +D WWQAR++ G++P
Sbjct: 1 YVRAMVDYWPQQDPSIPCADAGLPFRKGDILQIVDQNDSLWWQARKLSDLA--ACAGLIP 58
Query: 77 S 77
S
Sbjct: 59 S 59
>gnl|CDD|214620 smart00326, SH3, Src homology 3 domains. Src homology 3 (SH3)
domains bind to target proteins through sequences
containing proline and hydrophobic amino acids.
Pro-containing polypeptides may bind to SH3 domains in
2 different binding orientations.
Length = 56
Score = 54.1 bits (131), Expect = 2e-10
Identities = 22/57 (38%), Positives = 27/57 (47%), Gaps = 10/57 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RAL+DY D L F GDI+ V SDD WW+ R G + G+ PS
Sbjct: 6 RALYDYTAQDPDELS-----FKKGDIITVLEKSDDGWWKGRL----GRGK-EGLFPS 52
>gnl|CDD|212971 cd12038, SH3_MPP6, Src Homology 3 domain of Membrane Protein,
Palmitoylated 6 (or MAGUK p55 subfamily member 6).
MPP6, also called Veli-associated MAGUK 1 (VAM-1) or
PALS2, is a scaffolding protein that binds to Veli-1, a
homolog of Caenorhabditis Lin-7. It is one of seven
vertebrate homologs of the Drosophila Stardust protein,
which is required in establishing cell polarity, and it
contains two L27 domains followed by the core of three
domains characteristic of MAGUK (membrane-associated
guanylate kinase) proteins: PDZ, SH3, and guanylate
kinase (GuK). In addition, it also contains the Hook
(Protein 4.1 Binding) motif in between the SH3 and GuK
domains. The GuK domain in MAGUK proteins is
enzymatically inactive; instead, the domain mediates
protein-protein interactions and associates
intramolecularly with the SH3 domain. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 61
Score = 53.5 bits (128), Expect = 4e-10
Identities = 24/62 (38%), Positives = 34/62 (54%), Gaps = 5/62 (8%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
F + FDY+P D+ +P + GL F G+IL + N D WWQA V G G++P
Sbjct: 1 FVKCHFDYNPYNDNLIPCKEAGLKFSKGEILQIVNREDPNWWQASHVKEGGSA---GLIP 57
Query: 77 SK 78
S+
Sbjct: 58 SQ 59
>gnl|CDD|212970 cd12037, SH3_MPP2, Src Homology 3 domain of Membrane Protein,
Palmitoylated 2 (or MAGUK p55 subfamily member 2).
MPP2 is a scaffolding protein that interacts with the
non-receptor tyrosine kinase c-Src in epithelial cells
to negatively regulate its activity and morphological
function. It is one of seven vertebrate homologs of the
Drosophila Stardust protein, which is required in
establishing cell polarity, and it contains two L27
domains followed by the core of three domains
characteristic of MAGUK (membrane-associated guanylate
kinase) proteins: PDZ, SH3, and guanylate kinase (GuK).
In addition, it also contains the Hook (Protein 4.1
Binding) motif in between the SH3 and GuK domains. The
GuK domain in MAGUK proteins is enzymatically inactive;
instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 59
Score = 53.0 bits (127), Expect = 5e-10
Identities = 26/63 (41%), Positives = 35/63 (55%), Gaps = 8/63 (12%)
Query: 19 FSRALFDYDPTKDDGLPSR--GLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIV 75
F + FDYDP+ D +P + GL F GD+L + N D WWQA V E G G++
Sbjct: 1 FVKCHFDYDPSSDSLIPCKEAGLKFRAGDLLQIVNQEDPNWWQACHV-----EGGSAGLI 55
Query: 76 PSK 78
PS+
Sbjct: 56 PSQ 58
>gnl|CDD|212690 cd00174, SH3, Src Homology 3 domain superfamily. Src Homology 3
(SH3) domains are protein interaction domains that bind
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. Thus, they
are referred to as proline-recognition domains (PRDs).
SH3 domains are less selective and show more diverse
specificity compared to other PRDs. They have been
shown to bind peptide sequences that lack the PxxP
motif; examples include the PxxDY motif of Eps8 and the
RKxxYxxY sequence in SKAP55. SH3 domain containing
proteins play versatile and diverse roles in the cell,
including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies, among others. Many members of this
superfamily are adaptor proteins that associate with a
number of protein partners, facilitating complex
formation and signal transduction.
Length = 51
Score = 52.9 bits (128), Expect = 5e-10
Identities = 19/57 (33%), Positives = 26/57 (45%), Gaps = 10/57 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RAL+DY+ DD L F GDI+ V DD WW+ + G+ P+
Sbjct: 3 RALYDYEAQDDDELS-----FKKGDIITVLEKDDDGWWEGEL-----NGGREGLFPA 49
>gnl|CDD|212707 cd11773, SH3_Sla1p_1, First Src Homology 3 domain of the fungal
endocytic adaptor protein Sla1p. Sla1p facilitates
endocytosis by playing a role as an adaptor protein in
coupling components of the actin cytoskeleton to the
endocytic machinery. It interacts with Abp1p, Las17p
and Pan1p, which are activator proteins of
actin-related protein 2/3 (Arp2/3). Sla1p contains
multiple domains including three SH3 domains, a SAM
(sterile alpha motif) domain, and a Sla1 homology
domain 1 (SHD1), which binds to the NPFXD motif that is
found in many integral membrane proteins such as the
Golgi-localized Arf-binding protein Lsb5p and the
P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 57
Score = 50.5 bits (121), Expect = 4e-09
Identities = 21/58 (36%), Positives = 36/58 (62%), Gaps = 6/58 (10%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR-RVLPSGDEQGIGIVPS 77
+AL+DY+P +D L DIL++ SDD+WW+ + +V S D++ +G+VP+
Sbjct: 3 KALYDYEPQTEDELT-----IQEDDILYLLEKSDDDWWKVKLKVNSSDDDEPVGLVPA 55
>gnl|CDD|215659 pfam00018, SH3_1, SH3 domain. SH3 (Src homology 3) domains are
often indicative of a protein involved in signal
transduction related to cytoskeletal organisation.
First described in the Src cytoplasmic tyrosine kinase.
The structure is a partly opened beta barrel.
Length = 47
Score = 49.1 bits (118), Expect = 1e-08
Identities = 20/57 (35%), Positives = 26/57 (45%), Gaps = 10/57 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
AL+DY + D L F GDI+ V SDD WW+ R G++PS
Sbjct: 1 VALYDYTAREPDELS-----FKKGDIIIVLEKSDDGWWKGRL-----KGGKEGLIPS 47
>gnl|CDD|212779 cd11845, SH3_Src_like, Src homology 3 domain of Src kinase-like
Protein Tyrosine Kinases. Src subfamily members
include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes,
and Brk. Src (or c-Src) proteins are cytoplasmic (or
non-receptor) PTKs which are anchored to the plasma
membrane. They contain an N-terminal SH4 domain with a
myristoylation site, followed by SH3 and SH2 domains, a
tyr kinase domain, and a regulatory C-terminal region
containing a conserved tyr. They are activated by
autophosphorylation at the tyr kinase domain, but are
negatively regulated by phosphorylation at the
C-terminal tyr by Csk (C-terminal Src Kinase). However,
Brk lacks the N-terminal myristoylation sites. Src
proteins are involved in signaling pathways that
regulate cytokine and growth factor responses,
cytoskeleton dynamics, cell proliferation, survival,
and differentiation. They were identified as the first
proto-oncogene products, and they regulate cell
adhesion, invasion, and motility in cancer cells, and
tumor vasculature, contributing to cancer progression
and metastasis. Src kinases are overexpressed in a
variety of human cancers, making them attractive
targets for therapy. They are also implicated in acute
inflammatory responses and osteoclast function. Src,
Fyn, Yes, and Yrk are widely expressed, while Blk, Lck,
Hck, Fgr, Lyn, and Brk show a limited expression
pattern. This subfamily also includes Drosophila
Src42A, Src oncogene at 42A (also known as Dsrc41)
which accumulates at sites of cell-cell or cell-matrix
adhesion, and participates in Drosphila development and
wound healing. It has been shown to promote tube
elongation in the tracheal system, is essential for
proper cell-cell matching during dorsal closure, and
regulates cell-cell contacts in developing Drosophila
eyes. The SH3 domain of Src kinases contributes to
substrate recruitment by binding adaptor
proteins/substrates, and regulation of kinase activity
through an intramolecular interaction. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 52
Score = 47.2 bits (113), Expect = 7e-08
Identities = 24/58 (41%), Positives = 31/58 (53%), Gaps = 11/58 (18%)
Query: 21 RALFDYDP-TKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
AL+DY+ T DD L F GD L + + SD +WW AR L +G E G +PS
Sbjct: 3 VALYDYEARTDDD------LSFKKGDRLQILDDSDGDWWLARH-LSTGKE---GYIPS 50
>gnl|CDD|212706 cd11772, SH3_OSTF1, Src Homology 3 domain of metazoan osteoclast
stimulating factor 1. OSTF1, also named OSF or SH3P2,
is a signaling protein containing SH3 and
ankyrin-repeat domains. It acts through a Src-related
pathway to enhance the formation of osteoclasts and
bone resorption. It also acts as a negative regulator
of cell motility. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 44.6 bits (106), Expect = 7e-07
Identities = 20/57 (35%), Positives = 31/57 (54%), Gaps = 11/57 (19%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RAL+DY+ D L F GD+L++++ SD WW+A G + G++PS
Sbjct: 3 RALYDYEAQHPDELS-----FEEGDLLYISDKSDPNWWKAT----CGGKT--GLIPS 48
>gnl|CDD|212789 cd11855, SH3_Sho1p, Src homology 3 domain of High osmolarity
signaling protein Sho1p. Sho1p (or Sho1), also called
SSU81 (Suppressor of SUA8-1 mutation), is a yeast
membrane protein that regulates adaptation to high salt
conditions by activating the HOG (high-osmolarity
glycerol) pathway. High salt concentrations lead to the
localization to the membrane of the MAPKK Pbs2, which
is then activated by the MAPKK Ste11 and in turn,
activates the MAPK Hog1. Pbs2 is localized to the
membrane though the interaction of its PxxP motif with
the SH3 domain of Sho1p. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 55
Score = 42.8 bits (101), Expect = 3e-06
Identities = 24/57 (42%), Positives = 33/57 (57%), Gaps = 9/57 (15%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RAL+ YD + DD L F G+IL V++ S +WWQAR+ +G+ GI PS
Sbjct: 3 RALYPYDASPDD---PNELSFEKGEILEVSDTS-GKWWQARK--SNGE---TGICPS 50
>gnl|CDD|212741 cd11807, SH3_ASPP, Src homology 3 domain of Apoptosis Stimulating
of p53 proteins (ASPP). The ASPP family of proteins
bind to important regulators of apoptosis (p53, Bcl-2,
and RelA) and cell growth (APCL, PP1). They share
similarity at their C-termini, where they harbor a
proline-rich region, four ankyrin (ANK) repeats, and an
SH3 domain. Vertebrates contain three members of the
family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2
activate the apoptotic function of the p53 family of
tumor suppressors (p53, p63, and p73), while iASPP is
an oncoprotein that specifically inhibits p53-induced
apoptosis. The expression of ASPP proteins is altered
in tumors; ASPP1 and ASPP2 are downregulated whereas
iASPP is upregulated is some cancer types. ASPP
proteins also bind and regulate protein phosphatase 1
(PP1), and this binding is competitive with p53
binding. The SH3 domain and the ANK repeats of ASPP
contribute to the p53 binding site; they bind to the
DNA binding domain of p53. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 57
Score = 41.6 bits (98), Expect = 9e-06
Identities = 21/53 (39%), Positives = 24/53 (45%), Gaps = 12/53 (22%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDD---EWWQARRVLPSGDEQG 71
ALFDY+ D L F GD L V DD EWW AR D++G
Sbjct: 5 ALFDYEAENGD-----ELSFREGDELTVLRKGDDDETEWWWAR----LNDKEG 48
>gnl|CDD|212882 cd11949, SH3_GRB2_C, C-terminal Src homology 3 domain of Growth
factor receptor-bound protein 2. GRB2 is a critical
signaling molecule that regulates the Ras pathway by
linking tyrosine kinases to the Ras guanine nucleotide
releasing protein Sos (son of sevenless), which
converts Ras to the active GTP-bound state. It is
ubiquitously expressed in all tissues throughout
development and is important in cell cycle progression,
motility, morphogenesis, and angiogenesis. In
lymphocytes, GRB2 is associated with antigen receptor
signaling components. GRB2 contains an N-terminal SH3
domain, a central SH2 domain, and a C-terminal SH3
domain. The C-terminal SH3 domain of GRB2 binds to Gab2
(Grb2-associated binder 2) through epitopes containing
RxxK motifs, as well as to the proline-rich C-terminus
of FGRF2. SH3 domains are protein interaction domains
that typically bind to proline-rich ligands with
moderate affinity and selectivity, preferentially to
PxxP motifs. They play versatile and diverse roles in
the cell including the regulation of enzymes, changing
the subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 41.0 bits (96), Expect = 1e-05
Identities = 16/41 (39%), Positives = 23/41 (56%), Gaps = 5/41 (12%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQ 59
+ +ALFD+DP +D L F GD + V + SD WW+
Sbjct: 1 YVQALFDFDPQEDGELG-----FRRGDFIEVMDNSDPNWWK 36
>gnl|CDD|219499 pfam07653, SH3_2, Variant SH3 domain. SH3 (Src homology 3)
domains are often indicative of a protein involved in
signal transduction related to cytoskeletal
organisation. First described in the Src cytoplasmic
tyrosine kinase. The structure is a partly opened beta
barrel.
Length = 53
Score = 40.9 bits (97), Expect = 1e-05
Identities = 17/60 (28%), Positives = 24/60 (40%), Gaps = 11/60 (18%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKKR 80
R +FDY T L GD++ V + D+ WW+ R G+VPS
Sbjct: 3 RVIFDYVATDP-----NELSLKKGDVVKVLDKDDNGWWEGER------GGRRGLVPSSYV 51
>gnl|CDD|212692 cd11758, SH3_CRK_N, N-terminal Src Homology 3 domain of Ct10
Regulator of Kinase adaptor proteins. CRK adaptor
proteins consists of SH2 and SH3 domains, which bind
tyrosine-phosphorylated peptides and proline-rich
motifs, respectively. They function downstream of
protein tyrosine kinases in many signaling pathways
started by various extracellular signals, including
growth and differentiation factors. Cellular CRK
(c-CRK) contains a single SH2 domain, followed by
N-terminal and C-terminal SH3 domains. It is involved
in the regulation of many cellular processes including
cell growth, motility, adhesion, and apoptosis. CRK has
been implicated in the malignancy of various human
cancers. The N-terminal SH3 domain of CRK binds a
number of target proteins including DOCK180, C3G, SOS,
and cABL. The CRK family includes two alternatively
spliced protein forms, CRKI and CRKII, that are
expressed by the CRK gene, and the CRK-like (CRKL)
protein, which is expressed by a distinct gene (CRKL).
SH3 domains are protein interaction domains that bind
to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 55
Score = 40.0 bits (94), Expect = 3e-05
Identities = 20/57 (35%), Positives = 30/57 (52%), Gaps = 12/57 (21%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIVP 76
RALFD+ D+ LP F G+IL V +++WW AR + +G G++P
Sbjct: 4 RALFDFPGNDDEDLP-----FKKGEILTVIRKPEEQWWNAR------NSEGKTGMIP 49
>gnl|CDD|212739 cd11805, SH3_GRB2_like_C, C-terminal Src homology 3 domain of
Growth factor receptor-bound protein 2 (GRB2) and
related proteins. This family includes the adaptor
protein GRB2 and related proteins including Drosophila
melanogaster Downstream of receptor kinase (DRK),
Caenorhabditis elegans Sex muscle abnormal protein 5
(Sem-5), GRB2-related adaptor protein (GRAP), GRAP2,
and similar proteins. Family members contain an
N-terminal SH3 domain, a central SH2 domain, and a
C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical
signaling molecule that regulates the Ras pathway by
linking tyrosine kinases to the Ras guanine nucleotide
releasing protein Sos (son of sevenless), which
converts Ras to the active GTP-bound state. GRAP2 plays
an important role in T cell receptor (TCR) signaling by
promoting the formation of the SLP-76:LAT complex,
which couples the TCR to the Ras pathway. GRAP acts as
a negative regulator of T cell receptor (TCR)-induced
lymphocyte proliferation by downregulating the
signaling to the Ras/ERK pathway. The C-terminal SH3
domains (SH3c) of GRB2 and GRAP2 have been shown to
bind to classical PxxP motif ligands, as well as to
non-classical motifs. GRB2 SH3c binds Gab2
(Grb2-associated binder 2) through epitopes containing
RxxK motifs, while the SH3c of GRAP2 binds to the
phosphatase-like protein HD-PTP via a RxxxxK motif. SH3
domains are protein interaction domains that typically
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 39.9 bits (94), Expect = 4e-05
Identities = 14/43 (32%), Positives = 24/43 (55%), Gaps = 5/43 (11%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
+AL+D++P + L F GDI+ V ++SD +WW+
Sbjct: 1 RVQALYDFNPQEPGELE-----FRRGDIITVLDSSDPDWWKGE 38
>gnl|CDD|212939 cd12006, SH3_Fyn_Yrk, Src homology 3 domain of Fyn and Yrk
Protein Tyrosine Kinases. Fyn and Yrk (Yes-related
kinase) are members of the Src subfamily of proteins,
which are cytoplasmic (or non-receptor) PTKs. Fyn,
together with Lck, plays a critical role in T-cell
signal transduction by phosphorylating ITAM
(immunoreceptor tyr activation motif) sequences on
T-cell receptors, ultimately leading to the
proliferation and differentiation of T-cells. In
addition, Fyn is involved in the myelination of
neurons, and is implicated in Alzheimer's and
Parkinson's diseases. Yrk has been detected only in
chickens. It is primarily found in neuronal and
epithelial cells and in macrophages. It may play a role
in inflammation and in response to injury. Src kinases
contain an N-terminal SH4 domain with a myristoylation
site, followed by SH3 and SH2 domains, a tyr kinase
domain, and a regulatory C-terminal region containing a
conserved tyr. They are activated by
autophosphorylation at the tyr kinase domain, but are
negatively regulated by phosphorylation at the
C-terminal tyr by Csk (C-terminal Src Kinase). The SH3
domain of Src kinases contributes to substrate
recruitment by binding adaptor proteins/substrates, and
regulation of kinase activity through an intramolecular
interaction. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 56
Score = 39.6 bits (92), Expect = 5e-05
Identities = 22/57 (38%), Positives = 33/57 (57%), Gaps = 11/57 (19%)
Query: 22 ALFDYDP-TKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
AL+DY+ T+DD L FH G+ + N+S+ +WW+AR L +G G +PS
Sbjct: 5 ALYDYEARTEDD------LSFHKGEKFQILNSSEGDWWEARS-LTTG---ETGYIPS 51
>gnl|CDD|212754 cd11820, SH3_STAM, Src homology 3 domain of Signal Transducing
Adaptor Molecules. STAMs were discovered as proteins
that are highly phosphorylated following cytokine and
growth factor stimulation. They function in cytokine
signaling and surface receptor degradation, as well as
regulate Golgi morphology. They associate with many
proteins including Jak2 and Jak3 tyrosine kinases, Hrs,
AMSH, and UBPY. STAM adaptor proteins contain VHS
(Vps27, Hrs, STAM homology), ubiquitin interacting
(UIM), and SH3 domains. There are two vertebrate STAMs,
STAM1 and STAM2, which may be functionally redundant;
vertebrate STAMs contain ITAM motifs. They are part of
the endosomal sorting complex required for transport
(ESCRT-0). STAM2 deficiency in mice did not cause any
obvious abnormality, while STAM1 deficiency resulted in
growth retardation. Loss of both STAM1 and STAM2 in
mice proved lethal, indicating that STAMs are important
for embryonic development. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 54
Score = 39.4 bits (92), Expect = 6e-05
Identities = 17/57 (29%), Positives = 30/57 (52%), Gaps = 11/57 (19%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RAL+D++ +D+ L F G+I+ V + SD WW+ + +G G+ P+
Sbjct: 4 RALYDFEAAEDNELT-----FKAGEIITVLDDSDPNWWKGS------NHRGEGLFPA 49
>gnl|CDD|212884 cd11951, SH3_GRAP_C, C-terminal Src homology 3 domain of
GRB2-related adaptor protein. GRAP is a GRB-2 like
adaptor protein that is highly expressed in lymphoid
tissues. It acts as a negative regulator of T cell
receptor (TCR)-induced lymphocyte proliferation by
downregulating the signaling to the Ras/ERK pathway. It
has been identified as a regulator of TGFbeta signaling
in diabetic kidney tubules and may have a role in the
pathogenesis of the disease. GRAP contains an
N-terminal SH3 domain, a central SH2 domain, and a
C-terminal SH3 domain. The C-terminal SH3 domains
(SH3c) of the related proteins, GRB2 and GRAP2, have
been shown to bind to classical PxxP motif ligands, as
well as to non-classical motifs. GRB2 SH3c binds Gab2
(Grb2-associated binder 2) through epitopes containing
RxxK motifs, while the SH3c of GRAP2 binds to the
phosphatase-like protein HD-PTP via a RxxxxK motif. SH3
domains are protein interaction domains that typically
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 38.6 bits (90), Expect = 8e-05
Identities = 13/43 (30%), Positives = 19/43 (44%), Gaps = 5/43 (11%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
F +A +D+ L F GDI+ V + D WW+ R
Sbjct: 1 FVQAQYDFSAED-----PSQLSFRRGDIIEVLDCPDPNWWRGR 38
>gnl|CDD|212760 cd11826, SH3_Abi, Src homology 3 domain of Abl Interactor
proteins. Abl interactor (Abi) proteins are adaptor
proteins serving as binding partners and substrates of
Abl tyrosine kinases. They are involved in regulating
actin cytoskeletal reorganization and play important
roles in membrane-ruffling, endocytosis, cell motility,
and cell migration. They localize to sites of actin
polymerization in epithelial adherens junction and
immune synapses, as well as to the leading edge of
lamellipodia. Vertebrates contain two Abi proteins,
Abi1 and Abi2. Abi1 displays a wide expression pattern
while Abi2 is highly expressed in the eye and brain.
Abi proteins contain a homeobox homology domain, a
proline-rich region, and a SH3 domain. The SH3 domain
of Abi binds to a PxxP motif in Abl. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 52
Score = 38.5 bits (90), Expect = 9e-05
Identities = 17/39 (43%), Positives = 23/39 (58%), Gaps = 5/39 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQ 59
AL+DY KDD L F GDI++VT +DD W++
Sbjct: 3 VALYDYTADKDDELS-----FQEGDIIYVTKKNDDGWYE 36
>gnl|CDD|212797 cd11863, SH3_CACNB, Src Homology 3 domain of Voltage-dependent
L-type calcium channel subunit beta. Voltage-dependent
calcium channels (Ca(V)s) are multi-protein complexes
that regulate the entry of calcium into cells. They
impact muscle contraction, neuronal migration, hormone
and neurotransmitter release, and the activation of
calcium-dependent signaling pathways. They are composed
of four subunits: alpha1, alpha2delta, beta, and gamma.
The beta subunit is a soluble and intracellular protein
that interacts with the transmembrane alpha1 subunit.
It facilitates the trafficking and proper localization
of the alpha1 subunit to the cellular plasma membrane.
Vertebrates contain four different beta subunits from
distinct genes (beta1-4); each exists as multiple
splice variants. All are expressed in the brain while
other tissues show more specific expression patterns.
The beta subunits show similarity to MAGUK
(membrane-associated guanylate kinase) proteins in that
they contain SH3 and inactive guanylate kinase (GuK)
domains; however, they do not appear to contain a PDZ
domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 62
Score = 38.4 bits (90), Expect = 1e-04
Identities = 20/60 (33%), Positives = 27/60 (45%), Gaps = 5/60 (8%)
Query: 20 SRALFDYDPTKDDGLPSRG--LPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
R YD + DD P G + F D LH+ +++WW R V D IG +PS
Sbjct: 3 VRTNVGYDGSLDDDSPVPGYAVSFEAKDFLHIKEKYNNDWWIGRLVKEGCD---IGFIPS 59
>gnl|CDD|212896 cd11963, SH3_STAM2, Src homology 3 domain of Signal Transducing
Adaptor Molecule 2. STAM2, also called EAST (Epidermal
growth factor receptor-associated protein with SH3 and
TAM domain) or Hbp (Hrs binding protein), is part of
the endosomal sorting complex required for transport
(ESCRT-0). It plays a role in sorting mono-ubiquinated
endosomal cargo for trafficking to the lysosome for
degradation. It is also involved in the regulation of
exocytosis. STAMs were discovered as proteins that are
highly phosphorylated following cytokine and growth
factor stimulation. They function in cytokine signaling
and surface receptor degradation, as well as regulate
Golgi morphology. They associate with many proteins
including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH,
and UBPY. STAM adaptor proteins contain VHS (Vps27,
Hrs, STAM homology), ubiquitin interacting (UIM), and
SH3 domains. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 57
Score = 38.1 bits (88), Expect = 2e-04
Identities = 18/57 (31%), Positives = 32/57 (56%), Gaps = 11/57 (19%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RAL+D++ +D+ L F +G+I+ V + SD WW+ + +G+G+ PS
Sbjct: 5 RALYDFEAVEDNELT-----FKHGEIIIVLDDSDANWWKGE------NHRGVGLFPS 50
>gnl|CDD|212762 cd11828, SH3_ARHGEF9_like, Src homology 3 domain of ARHGEF9-like
Rho guanine nucleotide exchange factors. Members of
this family contain a SH3 domain followed by RhoGEF
(also called Dbl-homologous or DH) and Pleckstrin
Homology (PH) domains. They include the Rho guanine
nucleotide exchange factors ARHGEF9, ASEF (also called
ARHGEF4), ASEF2, and similar proteins. GEFs activate
small GTPases by exchanging bound GDP for free GTP.
ARHGEF9 specifically activates Cdc42, while both ASEF
and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is
highly expressed in the brain and it interacts with
gephyrin, a postsynaptic protein associated with GABA
and glycine receptors. ASEF plays a role in
angiogenesis and cell migration. ASEF2 is important in
cell migration and adhesion dynamics. ASEF exists in an
autoinhibited form and is activated upon binding of the
tumor suppressor APC (adenomatous polyposis coli),
leading to the activation of Rac1 or Cdc42. In its
autoinhibited form, the SH3 domain of ASEF forms an
extensive interface with the DH and PH domains,
blocking the Rac binding site. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 53
Score = 37.7 bits (88), Expect = 2e-04
Identities = 17/53 (32%), Positives = 25/53 (47%), Gaps = 9/53 (16%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG 71
+ AL+D+ T D L F GD++ V + SD +WW DE+G
Sbjct: 1 LAEALWDHV-TMDP----EELGFKAGDVIEVLDMSDKDWWWGSI----RDEEG 44
>gnl|CDD|212737 cd11803, SH3_Endophilin_A, Src homology 3 domain of Endophilin-A.
Endophilins play roles in synaptic vesicle formation,
virus budding, mitochondrial morphology maintenance,
receptor-mediated endocytosis inhibition, and endosomal
sorting. They are classified into two types, A and B.
Vertebrates contain three endophilin-A isoforms (A1,
A2, and A3). Endophilin-A proteins are enriched in the
brain and play multiple roles in receptor-mediated
endocytosis. They tubulate membranes and regulate
calcium influx into neurons to trigger the activation
of the endocytic machinery. They are also involved in
the sorting of plasma membrane proteins, actin filament
assembly, and the uncoating of clathrin-coated vesicles
for fusion with endosomes. Endophilins contain an
N-terminal N-BAR domain (BAR domain with an additional
N-terminal amphipathic helix), followed by a variable
region containing proline clusters, and a C-terminal
SH3 domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 55
Score = 37.6 bits (88), Expect = 2e-04
Identities = 15/41 (36%), Positives = 26/41 (63%), Gaps = 5/41 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
RAL+D++P +++G L F GDI+ +TN D+ W++
Sbjct: 4 RALYDFEP-ENEG----ELGFKEGDIITLTNQIDENWYEGM 39
>gnl|CDD|212897 cd11964, SH3_STAM1, Src homology 3 domain of Signal Transducing
Adaptor Molecule 1. STAM1 is part of the endosomal
sorting complex required for transport (ESCRT-0) and is
involved in sorting ubiquitinated cargo proteins from
the endosome. It may also be involved in the regulation
of IL2 and GM-CSF mediated signaling, and has been
implicated in neural cell survival. STAMs were
discovered as proteins that are highly phosphorylated
following cytokine and growth factor stimulation. They
function in cytokine signaling and surface receptor
degradation, as well as regulate Golgi morphology. They
associate with many proteins including Jak2 and Jak3
tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor
proteins contain VHS (Vps27, Hrs, STAM homology),
ubiquitin interacting (UIM), and SH3 domains. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 55
Score = 36.9 bits (85), Expect = 4e-04
Identities = 18/57 (31%), Positives = 29/57 (50%), Gaps = 11/57 (19%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
RA++D++ +D+ L F GDI+ + + SD WW+ QG G+ PS
Sbjct: 4 RAIYDFEAAEDNELT-----FKAGDIITILDDSDPNWWKGE------TPQGTGLFPS 49
>gnl|CDD|212883 cd11950, SH3_GRAP2_C, C-terminal Src homology 3 domain of
GRB2-related adaptor protein 2. GRAP2 is also called
GADS (GRB2-related adapter downstream of Shc), GrpL,
GRB2L, Mona, or GRID (Grb2-related protein with insert
domain). It is expressed specifically in the
hematopoietic system. It plays an important role in T
cell receptor (TCR) signaling by promoting the
formation of the SLP-76:LAT complex, which couples the
TCR to the Ras pathway. It also has roles in
antigen-receptor and tyrosine kinase mediated
signaling. GRAP2 is unique from other GRB2-like adaptor
proteins in that it can be regulated by caspase
cleavage. It contains an N-terminal SH3 domain, a
central SH2 domain, and a C-terminal SH3 domain. The
C-terminal SH3 domain of GRAP2 binds to different
motifs found in substrate peptides including the
typical PxxP motif in hematopoietic progenitor kinase 1
(HPK1), the RxxK motif in SLP-76 and HPK1, and the
RxxxxK motif in phosphatase-like protein HD-PTP. SH3
domains are protein interaction domains that typically
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 36.7 bits (85), Expect = 5e-04
Identities = 15/41 (36%), Positives = 26/41 (63%), Gaps = 5/41 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
RAL+D++ +DD L F+ GD++ V ++S+ WW+ R
Sbjct: 3 RALYDFEALEDDELG-----FNSGDVIEVLDSSNPSWWKGR 38
>gnl|CDD|212942 cd12009, SH3_Blk, Src homology 3 domain of Blk Protein Tyrosine
Kinase. Blk is a member of the Src subfamily of
proteins, which are cytoplasmic (or non-receptor) PTKs.
It is expressed specifically in B-cells and is involved
in pre-BCR (B-cell receptor) signaling. Src kinases
contain an N-terminal SH4 domain with a myristoylation
site, followed by SH3 and SH2 domains, a tyr kinase
domain, and a regulatory C-terminal region containing a
conserved tyr. They are activated by
autophosphorylation at the tyr kinase domain, but are
negatively regulated by phosphorylation at the
C-terminal tyr by Csk (C-terminal Src Kinase). The SH3
domain of Src kinases contributes to substrate
recruitment by binding adaptor proteins/substrates, and
regulation of kinase activity through an intramolecular
interaction. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 54
Score = 36.3 bits (84), Expect = 6e-04
Identities = 20/56 (35%), Positives = 28/56 (50%), Gaps = 10/56 (17%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
A +D+ P+ + R L G+ L V SD EWW A+ L +G E G +PS
Sbjct: 4 AQYDFVPSNE-----RDLQLKKGEKLQVL-KSDGEWWLAKS-LTTGKE---GYIPS 49
>gnl|CDD|212886 cd11953, SH3_ASPP2, Src Homology 3 (SH3) domain of Apoptosis
Stimulating of p53 protein 2. ASPP2 is the full length
form of the previously-identified tumor supressor,
p53-binding protein 2 (p53BP2). ASPP2 activates the
apoptotic function of the p53 family of tumor
suppressors (p53, p63, and p73). It plays a central
role in regulating apoptosis and cell growth;
ASPP2-deficient mice show postnatal death.
Downregulated expression of ASPP2 is frequently found
in breast tumors, lung cancer, and diffuse large B-cell
lymphoma where it is correlated with a poor clinical
outcome. ASPP2 contains a proline-rich region, four
ankyrin (ANK) repeats, and an SH3 domain at its
C-terminal half. The SH3 domain and the ANK repeats of
ASPP2 contribute to the p53 binding site; they bind to
the DNA binding domain of p53. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 57
Score = 36.1 bits (83), Expect = 0.001
Identities = 17/43 (39%), Positives = 21/43 (48%), Gaps = 8/43 (18%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGD---ILHVTNASDDEWWQAR 61
AL+DY+ DD L F GD IL + + EWW AR
Sbjct: 5 ALWDYEGESDD-----ELSFKEGDCMTILRREDEDETEWWWAR 42
>gnl|CDD|212811 cd11878, SH3_Bem1p_1, First Src Homology 3 domain of Bud
emergence protein 1 and similar domains. Members of
this subfamily bear similarity to Saccharomyces
cerevisiae Bem1p, containing two Src Homology 3 (SH3)
domains at the N-terminus, a central PX domain, and a
C-terminal PB1 domain. Bem1p is a scaffolding protein
that is critical for proper Cdc42p activation during
bud formation in yeast. During budding and mating,
Bem1p migrates to the plasma membrane where it can
serve as an adaptor for Cdc42p and some other proteins.
Bem1p also functions as an effector of the G1 cyclin
Cln3p and the cyclin-dependent kinase Cdc28p in
promoting vacuolar fusion. SH3 domains bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs; they play a
role in the regulation of enzymes by intramolecular
interactions, changing the subcellular localization of
signal pathway components and mediate multiprotein
complex assemblies.
Length = 54
Score = 35.3 bits (82), Expect = 0.002
Identities = 18/57 (31%), Positives = 24/57 (42%), Gaps = 10/57 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTN-ASDDEWWQARRVLPSGDEQGIGIVP 76
RAL+DY L F GD HV EW++A P ++ G+VP
Sbjct: 3 RALYDYRAQT-----PGELSFSKGDFFHVIGEEDQGEWYEATN--PVTGKR--GLVP 50
>gnl|CDD|212979 cd12046, SH3_p67phox_C, C-terminal (or second) Src Homology 3
domain of the p67phox subunit of NADPH oxidase.
p67phox, also called Neutrophil cytosol factor 2
(NCF-2), is a cytosolic subunit of the phagocytic NADPH
oxidase complex (also called Nox2 or gp91phox) which
plays a crucial role in the cellular response to
bacterial infection. NADPH oxidase catalyzes the
transfer of electrons from NADPH to oxygen during
phagocytosis forming superoxide and reactive oxygen
species. p67phox plays a regulatory role and contains
N-terminal TPR, first SH3 (or N-terminal or central
SH3), PB1, and C-terminal SH3 domains. It binds, via
its C-terminal SH3 domain, to a proline-rich region of
p47phox and upon activation, this complex assembles
with flavocytochrome b558, the Nox2-p22phox
heterodimer. Concurrently, RacGTP translocates to the
membrane and interacts with the TPR domain of p67phox,
which leads to the activation of NADPH oxidase. The PB1
domain of p67phox binds to its partner PB1 domain in
p40phox, and this facilitates the assembly of
p47phox-p67phox at the membrane. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 35.2 bits (81), Expect = 0.002
Identities = 17/57 (29%), Positives = 29/57 (50%), Gaps = 13/57 (22%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIVPS 77
ALF Y+ ++ + L F GD++ V + +++W + G +G IGI PS
Sbjct: 4 ALFSYEASQPEDLE-----FQKGDVILVLSKVNEDWLE-------GQCKGKIGIFPS 48
>gnl|CDD|212816 cd11883, SH3_Sdc25, Src Homology 3 domain of Sdc25/Cdc25 guanine
nucleotide exchange factors. This subfamily is
composed of the Saccharomyces cerevisiae guanine
nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and
similar proteins. These GEFs regulate Ras by
stimulating the GDP/GTP exchange on Ras. Cdc25 is
involved in the Ras/PKA pathway that plays an important
role in the regulation of metabolism, stress responses,
and proliferation, depending on available nutrients and
conditions. Proteins in this subfamily contain an
N-terminal SH3 domain as well as REM (Ras exchanger
motif) and RasGEF domains at the C-terminus. SH3
domains bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs; they play a role in the regulation of enzymes
by intramolecular interactions, changing the
subcellular localization of signal pathway components
and mediate multiprotein complex assemblies.
Length = 55
Score = 34.9 bits (81), Expect = 0.002
Identities = 13/38 (34%), Positives = 18/38 (47%), Gaps = 5/38 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
AL+D+ P + L F GDI++V N WW
Sbjct: 3 VALYDFTPKSKNQLS-----FKAGDIIYVLNKDPSGWW 35
>gnl|CDD|212793 cd11859, SH3_ZO, Src homology 3 domain of the Tight junction
proteins, Zonula occludens (ZO) proteins. ZO proteins
are scaffolding proteins that associate with each other
and with other proteins of the tight junction, zonula
adherens, and gap junctions. They play roles in
regulating cytoskeletal dynamics at these cell
junctions. They are considered members of the MAGUK
(membrane-associated guanylate kinase) protein family,
which is characterized by the presence of a core of
three domains: PDZ, SH3, and guanylate kinase (GuK).
The GuK domain in MAGUK proteins is enzymatically
inactive; instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. Vertebrates contain three ZO proteins
(ZO-1, ZO-2, and ZO-3) with redundant and non-redundant
roles. They contain three PDZ domains, followed by SH3
and GuK domains; in addition, ZO-1 and ZO-2 contains a
proline-rich (PR) actin binding domain at the
C-terminus while ZO-3 contains this PR domain between
the second and third PDZ domains. The C-terminal
regions of the three ZO proteins are unique. The SH3
domain of ZO-1 has been shown to bind ZONAB, ZAK,
afadin, and Galpha12. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 62
Score = 34.6 bits (80), Expect = 0.003
Identities = 20/67 (29%), Positives = 29/67 (43%), Gaps = 8/67 (11%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDE---WWQARRVLPSGDEQGIGIV 75
+ R FDY+ L F G++ HV + WQA RV + E G++
Sbjct: 1 YIRTHFDYEKP-----AKGELSFKKGEVFHVVDTLYQGTVGSWQAVRVGRNHQELERGVI 55
Query: 76 PSKKRWE 82
P+K R E
Sbjct: 56 PNKSRAE 62
>gnl|CDD|212758 cd11824, SH3_PSTPIP1, Src homology 3 domain of
Proline-Serine-Threonine Phosphatase-Interacting
Protein 1. PSTPIP1, also called CD2 Binding Protein 1
(CD2BP1), is mainly expressed in hematopoietic cells.
It is a binding partner of the cell surface receptor
CD2 and PTP-PEST, a tyrosine phosphatase which
functions in cell motility and Rac1 regulation. It also
plays a role in the activation of the Wiskott-Aldrich
syndrome protein (WASP), which couples actin
rearrangement and T cell activation. Mutations in the
gene encoding PSTPIP1 cause the autoinflammatory
disorder known as PAPA (pyogenic sterile arthritis,
pyoderma gangrenosum, and acne) syndrome. PSTPIP1
contains an N-terminal F-BAR domain, PEST motifs, and a
C-terminal SH3 domain. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 53
Score = 34.3 bits (79), Expect = 0.003
Identities = 15/50 (30%), Positives = 21/50 (42%), Gaps = 7/50 (14%)
Query: 19 FSRALFDYDPTKDDGLP-SRGLPFHYGDILHVTNASDDEWWQARRVLPSG 67
L+DY +DD L S+G D++ V +D WW R G
Sbjct: 1 KYSVLYDYTAQEDDELSISKG------DVVAVIEKGEDGWWTVERNGQKG 44
>gnl|CDD|212994 cd12061, SH3_betaPIX, Src Homology 3 domain of beta-Pak
Interactive eXchange factor. Beta-PIX, also called Rho
guanine nucleotide exchange factor 7 (ARHGEF7) or Cool
(Cloned out of Library)-1, activates small GTPases by
exchanging bound GDP for free GTP. It acts as a GEF for
both Cdc42 and Rac 1, and plays important roles in
regulating neuroendocrine exocytosis, focal adhesion
maturation, cell migration, synaptic vesicle
localization, and insulin secretion. PIX proteins
contain an N-terminal SH3 domain followed by RhoGEF
(also called Dbl-homologous or DH) and Pleckstrin
Homology (PH) domains, and a C-terminal leucine-zipper
domain for dimerization. The SH3 domain of PIX binds to
an atypical PxxxPR motif in p21-activated kinases
(PAKs) with high affinity. The binding of PAKs to PIX
facilitate the localization of PAKs to focal complexes
and also localizes PAKs to PIX targets Cdc43 and Rac,
leading to the activation of PAKs. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 54
Score = 34.3 bits (78), Expect = 0.004
Identities = 14/40 (35%), Positives = 21/40 (52%), Gaps = 5/40 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQA 60
RA F++ T +D L F GD++HVT + WW+
Sbjct: 3 RAKFNFQQTNEDELS-----FSKGDVIHVTRVEEGGWWEG 37
>gnl|CDD|212703 cd11769, SH3_CSK, Src Homology 3 domain of C-terminal Src kinase.
CSK is a cytoplasmic (or nonreceptor) tyr kinase
containing the Src homology domains, SH3 and SH2,
N-terminal to the catalytic tyr kinase domain. They
negatively regulate the activity of Src kinases that
are anchored to the plasma membrane. To inhibit Src
kinases, CSK is translocated to the membrane via
binding to specific transmembrane proteins, G-proteins,
or adaptor proteins near the membrane. CSK catalyzes
the tyr phosphorylation of the regulatory C-terminal
tail of Src kinases, resulting in their inactivation.
It is expressed in a wide variety of tissues and plays
a role, as a regulator of Src, in cell proliferation,
survival, and differentiation, and consequently, in
cancer development and progression. In addition, CSK
also shows Src-independent functions. It is a critical
component in G-protein signaling, and plays a role in
cytoskeletal reorganization and cell migration. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 57
Score = 34.2 bits (79), Expect = 0.004
Identities = 16/56 (28%), Positives = 27/56 (48%), Gaps = 11/56 (19%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDD-EWWQARRVLPSGDEQGIGIVP 76
A ++++ G LPF GDIL + + D W++A+ G E G++P
Sbjct: 6 AKYNFN-----GASEEDLPFKKGDILTIVAVTKDPNWYKAKNK--DGRE---GMIP 51
>gnl|CDD|212974 cd12041, SH3_CACNB1, Src Homology 3 domain of Voltage-dependent
L-type calcium channel subunit beta-1. The beta1
subunit of voltage-dependent calcium channels (Ca(V)s)
is one of four beta subunits present in vertebrates. It
is the only beta subunit, as the beta1a variant,
expressed in skeletal muscle; the beta1b variant is
also widely expressed in other tissues including the
heart and brain. Knockout of the beta1 gene in mice
results in embryonic lethality, demonstrating its
importance in development. Ca(V)s are multi-protein
complexes that regulate the entry of calcium into
cells. They impact muscle contraction, neuronal
migration, hormone and neurotransmitter release, and
the activation of calcium-dependent signaling pathways.
They are composed of four subunits: alpha1,
alpha2delta, beta, and gamma. The beta subunit is a
soluble and intracellular protein that interacts with
the transmembrane alpha1 subunit. It facilitates the
trafficking and proper localization of the alpha1
subunit to the cellular plasma membrane. Vertebrates
contain four different beta subunits from distinct
genes (beta1-4); each exists as multiple splice
variants. All are expressed in the brain while other
tissues show more specific expression patterns. The
beta subunits show similarity to MAGUK
(membrane-associated guanylate kinase) proteins in that
they contain SH3 and inactive guanylate kinase (GuK)
domains; however, they do not appear to contain a PDZ
domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 68
Score = 34.6 bits (79), Expect = 0.004
Identities = 19/59 (32%), Positives = 31/59 (52%), Gaps = 5/59 (8%)
Query: 26 YDPTKDDGLPSRGL--PFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKKRWE 82
Y+P+ D +P +G+ F D LH+ +++WW R V G E +G +PS + E
Sbjct: 13 YNPSPGDDVPVQGMAISFEPKDFLHIKEKYNNDWWIGRLV-KEGCE--VGFIPSPVKLE 68
>gnl|CDD|212891 cd11958, SH3_RUSC1, Src homology 3 domain of RUN and SH3
domain-containing protein 1. RUSC1, also called NESCA
(New molecule containing SH3 at the carboxy-terminus),
is highly expressed in the brain and is translocated to
the nuclear membrane from the cytoplasm upon
stimulation with neurotrophin. It plays a role in
facilitating neurotrophin-dependent neurite outgrowth.
It also interacts with NEMO (or IKKgamma) and may
function in NEMO-mediated activation of NF-kB. RUSC
proteins are adaptor proteins consisting of RUN,
leucine zipper, and SH3 domains. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 51
Score = 34.0 bits (78), Expect = 0.004
Identities = 18/56 (32%), Positives = 27/56 (48%), Gaps = 12/56 (21%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
RAL D+ ++ L F G+ L V D++W + RR GD + G+VP
Sbjct: 3 RALCDHAGSES------QLSFRKGEELQVLGTVDEDWIRCRR----GDRE--GLVP 46
>gnl|CDD|212702 cd11768, SH3_Tec_like, Src Homology 3 domain of Tec-like Protein
Tyrosine Kinases. The Tec (Tyrosine kinase expressed
in hepatocellular carcinoma) subfamily is composed of
Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and
similar proteins. They are cytoplasmic (or nonreceptor)
tyr kinases containing Src homology protein interaction
domains (SH3, SH2) N-terminal to the catalytic tyr
kinase domain. Most Tec subfamily members (except Rlk)
also contain an N-terminal pleckstrin homology (PH)
domain, which binds the products of PI3K and allows
membrane recruitment and activation. In addition, some
members contain the Tec homology (TH) domain, which
contains proline-rich and zinc-binding regions. Tec
kinases are expressed mainly by haematopoietic cells,
although Tec and Bmx are also found in endothelial
cells. B-cells express Btk and Tec, while T-cells
express Itk, Txk, and Tec. Collectively, Tec kinases
are expressed in a variety of myeloid cells such as
mast cells, platelets, macrophages, and dendritic
cells. Each Tec kinase shows a distinct cell-type
pattern of expression. The function of Tec kinases in
lymphoid cells have been studied extensively. They play
important roles in the development, differentiation,
maturation, regulation, survival, and function of
B-cells and T-cells. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 54
Score = 33.8 bits (78), Expect = 0.005
Identities = 18/57 (31%), Positives = 28/57 (49%), Gaps = 12/57 (21%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIVPS 77
AL+D+ P + LP G+ V + S++ WW+AR D+ G G +PS
Sbjct: 4 ALYDFQPIEPGDLPLEK-----GEEYVVLDDSNEHWWRAR------DKNGNEGYIPS 49
>gnl|CDD|212973 cd12040, SH3_CACNB2, Src Homology 3 domain of Voltage-dependent
L-type calcium channel subunit beta2. The beta2
subunit of voltage-dependent calcium channels (Ca(V)s)
is one of four beta subunits present in vertebrates. It
is expressed in the heart and is present in specific
neuronal cells including cerebellar Purkinje cells,
hippocampal pyramidal neurons, and photoreceptors.
Knockout of the beta2 gene in mice results in embryonic
lethality, demonstrating its importance in development.
Ca(V)s are multi-protein complexes that regulate the
entry of calcium into cells. They impact muscle
contraction, neuronal migration, hormone and
neurotransmitter release, and the activation of
calcium-dependent signaling pathways. They are composed
of four subunits: alpha1, alpha2delta, beta, and gamma.
The beta subunit is a soluble and intracellular protein
that interacts with the transmembrane alpha1 subunit.
It facilitates the trafficking and proper localization
of the alpha1 subunit to the cellular plasma membrane.
Vertebrates contain four different beta subunits from
distinct genes (beta1-4); each exists as multiple
splice variants. All are expressed in the brain while
other tissues show more specific expression patterns.
The beta subunits show similarity to MAGUK
(membrane-associated guanylate kinase) proteins in that
they contain SH3 and inactive guanylate kinase (GuK)
domains; however, they do not appear to contain a PDZ
domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 69
Score = 34.2 bits (78), Expect = 0.005
Identities = 17/59 (28%), Positives = 26/59 (44%), Gaps = 5/59 (8%)
Query: 26 YDPTKDDGLP--SRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKKRWE 82
Y +D +P + F D LHV +++WW R V + IG +PS + E
Sbjct: 14 YSAAHEDDVPVPGMAISFEAKDFLHVKEKFNNDWWIGRLVKEGCE---IGFIPSPVKLE 69
>gnl|CDD|212696 cd11762, SH3_FCHSD_2, Second Src Homology 3 domain of FCH and
double SH3 domains proteins. This group is composed of
FCH and double SH3 domains protein 1 (FCHSD1) and
FCHSD2. These proteins have a common domain structure
consisting of an N-terminal F-BAR (FES-CIP4 Homology
and Bin/Amphiphysin/Rvs), two SH3, and C-terminal
proline-rich domains. They have only been characterized
in silico and their functions remain unknown. This
group also includes the insect protein, nervous wreck,
which acts as a regulator of synaptic growth signaling.
SH3 domains are protein interaction domains that bind
to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 57
Score = 33.9 bits (78), Expect = 0.005
Identities = 19/64 (29%), Positives = 28/64 (43%), Gaps = 17/64 (26%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNAS----DDEWWQARRVLPSGDEQG-IG 73
RAL+DY+ D+ L F G I+ + DD WW+ G+ G +G
Sbjct: 1 LVRALYDYEAQSDE-----ELSFPEGAIIRILRKDDNGVDDGWWE-------GEFNGRVG 48
Query: 74 IVPS 77
+ PS
Sbjct: 49 VFPS 52
>gnl|CDD|212975 cd12042, SH3_CACNB3, Src Homology 3 domain of Voltage-dependent
L-type calcium channel subunit beta3. The beta3
subunit of voltage-dependent calcium channels (Ca(V)s)
is one of four beta subunits present in vertebrates. It
is the main beta subunit present in smooth muscles and
is strongly expressed in the brain; it is predominant
in the olfactory bulb, cortex, and hippocampus. It may
play a role in regulating the NMDAR
(N-methyl-d-aspartate receptor) activity in the
hippocampus and thus, activity-dependent synaptic
plasticity and cognitive behaviors. Ca(V)s are
multi-protein complexes that regulate the entry of
calcium into cells. They impact muscle contraction,
neuronal migration, hormone and neurotransmitter
release, and the activation of calcium-dependent
signaling pathways. They are composed of four subunits:
alpha1, alpha2delta, beta, and gamma. The beta subunit
is a soluble and intracellular protein that interacts
with the transmembrane alpha1 subunit. It facilitates
the trafficking and proper localization of the alpha1
subunit to the cellular plasma membrane. Vertebrates
contain four different beta subunits from distinct
genes (beta1-4); each exists as multiple splice
variants. All are expressed in the brain while other
tissues show more specific expression patterns. The
beta subunits show similarity to MAGUK
(membrane-associated guanylate kinase) proteins in that
they contain SH3 and inactive guanylate kinase (GuK)
domains; however, they do not appear to contain a PDZ
domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 68
Score = 34.2 bits (78), Expect = 0.005
Identities = 18/54 (33%), Positives = 26/54 (48%), Gaps = 5/54 (9%)
Query: 31 DDGLPSRG--LPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKKRWE 82
D+ P +G + F D LH+ ++WW R V GD I +PS +R E
Sbjct: 18 DEECPVQGAAINFEAKDFLHIKEKYSNDWWIGRLVKEGGD---IAFIPSPQRLE 68
>gnl|CDD|212976 cd12043, SH3_CACNB4, Src Homology 3 domain of Voltage-dependent
L-type calcium channel subunit beta4. The beta4
subunit of voltage-dependent calcium channels (Ca(V)s)
is one of four beta subunits present in vertebrates. It
is the only beta subunit expressed in the cochlea and
is highly expressed in the brain, predominantly in the
cerebellum. Ca(V)s are multi-protein complexes that
regulate the entry of calcium into cells. They impact
muscle contraction, neuronal migration, hormone and
neurotransmitter release, and the activation of
calcium-dependent signaling pathways. They are composed
of four subunits: alpha1, alpha2delta, beta, and gamma.
The beta subunit is a soluble and intracellular protein
that interacts with the transmembrane alpha1 subunit.
It facilitates the trafficking and proper localization
of the alpha1 subunit to the cellular plasma membrane.
Vertebrates contain four different beta subunits from
distinct genes (beta1-4); each exists as multiple
splice variants. All are expressed in the brain while
other tissues show more specific expression patterns.
The beta subunits show similarity to MAGUK
(membrane-associated guanylate kinase) proteins in that
they contain SH3 and inactive guanylate kinase (GuK)
domains; however, they do not appear to contain a PDZ
domain. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 68
Score = 34.2 bits (78), Expect = 0.006
Identities = 16/53 (30%), Positives = 25/53 (47%), Gaps = 3/53 (5%)
Query: 30 KDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKKRWE 82
+D +P + F D LH+ +++WW R V + IG +PS R E
Sbjct: 19 EDVPVPGTAISFDAKDFLHIKEKYNNDWWIGRLVKEGCE---IGFIPSPLRLE 68
>gnl|CDD|212940 cd12007, SH3_Yes, Src homology 3 domain of Yes Protein Tyrosine
Kinase. Yes (or c-Yes) is a member of the Src
subfamily of proteins, which are cytoplasmic (or
non-receptor) PTKs. c-Yes kinase is the cellular
homolog of the oncogenic protein (v-Yes) encoded by the
Yamaguchi 73 and Esh sarcoma viruses. It displays
functional overlap with other Src subfamily members,
particularly Src. It also shows some unique functions
such as binding to occludins, transmembrane proteins
that regulate extracellular interactions in tight
junctions. Yes also associates with a number of
proteins in different cell types that Src does not
interact with, like JAK2 and gp130 in pre-adipocytes,
and Pyk2 in treated pulmonary vein endothelial cells.
Although the biological function of Yes remains
unclear, it appears to have a role in regulating
cell-cell interactions and vesicle trafficking in
polarized cells. Src kinases contain an N-terminal SH4
domain with a myristoylation site, followed by SH3 and
SH2 domains, a tyr kinase domain, and a regulatory
C-terminal region containing a conserved tyr. They are
activated by autophosphorylation at the tyr kinase
domain, but are negatively regulated by phosphorylation
at the C-terminal tyr by Csk (C-terminal Src Kinase).
The SH3 domain of Src kinases contributes to substrate
recruitment by binding adaptor proteins/substrates, and
regulation of kinase activity through an intramolecular
interaction. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 58
Score = 33.5 bits (76), Expect = 0.007
Identities = 14/43 (32%), Positives = 24/43 (55%), Gaps = 7/43 (16%)
Query: 22 ALFDYDP-TKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRV 63
AL+DY+ T +D L F G+ + N ++ +WW+AR +
Sbjct: 5 ALYDYEARTTED------LSFKKGERFQIINNTEGDWWEARSI 41
>gnl|CDD|212881 cd11948, SH3_GRAP_N, N-terminal Src homology 3 domain of
GRB2-related adaptor protein. GRAP is a GRB-2 like
adaptor protein that is highly expressed in lymphoid
tissues. It acts as a negative regulator of T cell
receptor (TCR)-induced lymphocyte proliferation by
downregulating the signaling to the Ras/ERK pathway. It
has been identified as a regulator of TGFbeta signaling
in diabetic kidney tubules and may have a role in the
pathogenesis of the disease. GRAP contains an
N-terminal SH3 domain, a central SH2 domain, and a
C-terminal SH3 domain. The N-terminal SH3 domain of the
related protein GRB2 binds to Sos and Sos-derived
proline-rich peptides. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 54
Score = 33.3 bits (76), Expect = 0.007
Identities = 15/39 (38%), Positives = 21/39 (53%), Gaps = 5/39 (12%)
Query: 20 SRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
+ AL+ + T+ D LP F GDIL + N DD+ W
Sbjct: 2 AVALYSFQATESDELP-----FQKGDILKILNMEDDQNW 35
>gnl|CDD|212753 cd11819, SH3_Cortactin_like, Src homology 3 domain of Cortactin
and related proteins. This subfamily includes
cortactin, Abp1 (actin-binding protein 1),
hematopoietic lineage cell-specific protein 1 (HS1),
and similar proteins. These proteins are involved in
regulating actin dynamics through direct or indirect
interaction with the Arp2/3 complex, which is required
to initiate actin polymerization. They all contain at
least one C-terminal SH3 domain. Cortactin and HS1 bind
Arp2/3 and actin through an N-terminal region that
contains an acidic domain and several copies of a
repeat domain found in cortactin and HS1. Abp1 binds
actin via an N-terminal actin-depolymerizing factor
(ADF) homology domain. Yeast Abp1 binds Arp2/3 directly
through two acidic domains. Mammalian Abp1 does not
directly interact with Arp2/3; instead, it regulates
actin dynamics indirectly by interacting with dynamin
and WASP family proteins. The C-terminal region of
these proteins acts as an adaptor or scaffold that can
connect membrane trafficking and signaling proteins
that bind the SH3 domain within the actin network. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 54
Score = 33.4 bits (77), Expect = 0.007
Identities = 16/57 (28%), Positives = 25/57 (43%), Gaps = 10/57 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
+AL+DY +D+ + F GDI+ D+ WW V G G+ P+
Sbjct: 3 KALYDYQAAEDN-----EISFVEGDIITQIEQIDEGWWLG--VNAKGQ---KGLFPA 49
>gnl|CDD|212781 cd11847, SH3_Brk, Src homology 3 domain of Brk (Breast tumor
kinase) Protein Tyrosine Kinase (PTK), also called
PTK6. Brk is a cytoplasmic (or non-receptor) PTK with
limited homology to Src kinases. It has been found to
be overexpressed in a majority of breast tumors. It
plays roles in normal cell differentiation,
proliferation, survival, migration, and cell cycle
progression. Brk substrates include RNA-binding
proteins (SLM-1/2, Sam68), transcription factors
(STAT3/5), and signaling molecules (Akt, paxillin,
IRS-4). Src kinases in general contain an N-terminal
SH4 domain with a myristoylation site, followed by SH3
and SH2 domains, a tyr kinase domain, and a regulatory
C-terminal region containing a conserved tyr; they are
activated by autophosphorylation at the tyr kinase
domain, but are negatively regulated by phosphorylation
at the C-terminal tyr by Csk (C-terminal Src Kinase).
However, Brk lacks the N-terminal myristoylation site.
The SH3 domain of Src kinases contributes to substrate
recruitment by binding adaptor proteins/substrates, and
regulation of kinase activity through an intramolecular
interaction. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 58
Score = 33.3 bits (76), Expect = 0.008
Identities = 17/55 (30%), Positives = 24/55 (43%), Gaps = 6/55 (10%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
AL+D+ D+ L F GD + S D WW A ++ +G G VP
Sbjct: 4 ALWDFKARGDEELS-----FQAGDQFRIAERSGD-WWTALKLDRAGGVVAQGFVP 52
>gnl|CDD|212906 cd11973, SH3_ASEF, Src homology 3 domain of APC-Stimulated
guanine nucleotide Exchange Factor. ASEF, also called
ARHGEF4, exists in an autoinhibited form and is
activated upon binding of the tumor suppressor APC
(adenomatous polyposis coli). GEFs activate small
GTPases by exchanging bound GDP for free GTP. ASEF can
activate Rac1 or Cdc42. Truncated ASEF, which is found
in colorectal cancers, is constitutively active and has
been shown to promote angiogenesis and cancer cell
migration. ASEF contains a SH3 domain followed by
RhoGEF (also called Dbl-homologous or DH) and
Pleckstrin Homology (PH) domains. In its autoinhibited
form, the SH3 domain of ASEF forms an extensive
interface with the DH and PH domains, blocking the Rac
binding site. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 73
Score = 33.8 bits (77), Expect = 0.008
Identities = 19/51 (37%), Positives = 28/51 (54%), Gaps = 5/51 (9%)
Query: 11 LISTHLFSFSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
LIS + AL+D+ T DD + L F GD++ V +A++ EWW R
Sbjct: 11 LISDGSVVCAEALWDH-VTMDD----QELGFKAGDVIEVMDATNKEWWWGR 56
>gnl|CDD|212810 cd11877, SH3_PIX, Src Homology 3 domain of Pak Interactive
eXchange factors. PIX proteins are Rho guanine
nucleotide exchange factors (GEFs), which activate
small GTPases by exchanging bound GDP for free GTP.
They act as GEFs for both Cdc42 and Rac 1, and have
been implicated in cell motility, adhesion, neurite
outgrowth, and cell polarity. Vertebrates contain two
proteins from the PIX subfamily, alpha-PIX and
beta-PIX. Alpha-PIX, also called ARHGEF6, is localized
in dendritic spines where it regulates spine
morphogenesis. Mutations in the ARHGEF6 gene cause
X-linked intellectual disability in humans. Beta-PIX
play roles in regulating neuroendocrine exocytosis,
focal adhesion maturation, cell migration, synaptic
vesicle localization, and insulin secretion. PIX
proteins contain an N-terminal SH3 domain followed by
RhoGEF (also called Dbl-homologous or DH) and
Pleckstrin Homology (PH) domains, and a C-terminal
leucine-zipper domain for dimerization. The SH3 domain
of PIX binds to an atypical PxxxPR motif in
p21-activated kinases (PAKs) with high affinity. The
binding of PAKs to PIX facilitate the localization of
PAKs to focal complexes and also localizes PAKs to PIX
targets Cdc43 and Rac, leading to the activation of
PAKs. SH3 domains are protein interaction domains that
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 33.1 bits (76), Expect = 0.008
Identities = 14/39 (35%), Positives = 21/39 (53%), Gaps = 5/39 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQ 59
RA F+++ T +D L F GDI+ VT + WW+
Sbjct: 3 RAKFNFEGTNEDELS-----FDKGDIITVTQVVEGGWWE 36
>gnl|CDD|212820 cd11887, SH3_Bbc1, Src Homology 3 domain of Bbc1 and similar
domains. This subfamily is composed of Saccharomyces
cerevisiae Bbc1p, also called Mti1p (Myosin tail
region-interacting protein), and similar proteins.
Bbc1p interacts with and regulates type I myosins in
yeast, Myo3p and Myo5p, which are involved in actin
cytoskeletal reorganization. It also binds and inhibits
Las17, a WASp family protein that functions as an
activator of the Arp2/3 complex. Bbc1p contains an
N-terminal SH3 domain. SH3 domains bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs; they play a role in the
regulation of enzymes by intramolecular interactions,
changing the subcellular localization of signal pathway
components and mediate multiprotein complex assemblies.
Length = 60
Score = 33.1 bits (76), Expect = 0.009
Identities = 16/56 (28%), Positives = 27/56 (48%), Gaps = 6/56 (10%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+AL+ Y+ +D L F G ++ VT D +W+ V +G+ + GI P
Sbjct: 5 KALYPYESDHEDDLN-----FDVGQLITVTEEEDADWYFGEYVDSNGNTK-EGIFP 54
>gnl|CDD|212755 cd11821, SH3_ASAP, Src homology 3 domain of ArfGAP with SH3
domain, ankyrin repeat and PH domain containing
proteins. ASAPs are Arf GTPase activating proteins
(GAPs) and they function in regulating cell growth,
migration, and invasion. They contain an N-terminal BAR
domain, followed by a Pleckstrin homology (PH) domain,
an Arf GAP domain, ankyrin (ANK) repeats, and a
C-terminal SH3 domain. Vertebrates contain at least
three members, ASAP1, ASAP2, and ASAP3, but some ASAP3
proteins do not seem to harbor a C-terminal SH3 domain.
ASAP1 and ASAP2 show GTPase activating protein (GAP)
activity towards Arf1 and Arf5. They do not show GAP
activity towards Arf6, but are able to mediate Arf6
signaling by binding stably to GTP-Arf6. ASAP3 is an
Arf6-specific GAP. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 32.7 bits (75), Expect = 0.011
Identities = 17/38 (44%), Positives = 20/38 (52%), Gaps = 5/38 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
RAL+D DD L F G+I+ VT DDEWW
Sbjct: 3 RALYDCQADNDDELT-----FSEGEIIVVTGEEDDEWW 35
>gnl|CDD|212928 cd11995, SH3_Intersectin1_5, Fifth Src homology 3 domain (or
SH3E) of Intersectin-1. Intersectin-1 (ITSN1) is an
adaptor protein that functions in exo- and endocytosis,
actin cytoskeletal reorganization, and signal
transduction. It plays a role in clathrin-coated pit
(CCP) formation. It binds to many proteins through its
multidomain structure and facilitate the assembly of
multimeric complexes. ITSN1 localizes in membranous
organelles, CCPs, the Golgi complex, and may be
involved in the cell membrane trafficking system. It
exists in alternatively spliced short and long
isoforms. The short isoform contains two Eps15 homology
domains (EH1 and EH2), a coiled-coil region and five
SH3 domains (SH3A-E), while the long isoform, in
addition, contains RhoGEF (also called Dbl-homologous
or DH), Pleckstrin homology (PH) and C2 domains. The
fifth SH3 domain (or SH3E) of ITSN1 has been shown to
bind many protein partners including SGIP1, Sos1,
dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and
synaptojanin-1, among others. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 54
Score = 33.0 bits (75), Expect = 0.012
Identities = 18/57 (31%), Positives = 27/57 (47%), Gaps = 13/57 (22%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIVPS 77
++DY DD L F G I++V N D +WW+ G+ G +G+ PS
Sbjct: 5 GMYDYTAQNDDELA-----FSKGQIINVLNKEDPDWWK-------GELNGQVGLFPS 49
>gnl|CDD|212721 cd11787, SH3_SH3RF_2, Second Src Homology 3 domain of SH3 domain
containing ring finger proteins. This model represents
the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or
POSHER), SH3RF3 (POSH2), and similar domains. Members
of this family are scaffold proteins that function as
E3 ubiquitin-protein ligases. They all contain an
N-terminal RING finger domain and multiple SH3 domains;
SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2
has three. SH3RF1 plays a role in calcium homeostasis
through the control of the ubiquitin domain protein
Herp. It may also have a role in regulating death
receptor mediated and JNK mediated apoptosis. SH3RF3
interacts with p21-activated kinase 2 (PAK2) and
GTP-loaded Rac1. It may play a role in regulating JNK
mediated apoptosis in certain conditions. SH3RF2 acts
as an anti-apoptotic regulator of the JNK pathway by
binding to and promoting the degradation of SH3RF1. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 32.7 bits (75), Expect = 0.013
Identities = 18/58 (31%), Positives = 28/58 (48%), Gaps = 8/58 (13%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+AL+D++ +D L F GD++ V D+ W + R GD+ IGI P
Sbjct: 1 QCKALYDFEMKDED--EKDCLTFKKGDVITVIRRVDENWAEGRL----GDK--IGIFP 50
>gnl|CDD|212738 cd11804, SH3_GRB2_like_N, N-terminal Src homology 3 domain of
Growth factor receptor-bound protein 2 (GRB2) and
related proteins. This family includes the adaptor
protein GRB2 and related proteins including Drosophila
melanogaster Downstream of receptor kinase (DRK),
Caenorhabditis elegans Sex muscle abnormal protein 5
(Sem-5), GRB2-related adaptor protein (GRAP), GRAP2,
and similar proteins. Family members contain an
N-terminal SH3 domain, a central SH2 domain, and a
C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical
signaling molecule that regulates the Ras pathway by
linking tyrosine kinases to the Ras guanine nucleotide
releasing protein Sos (son of sevenless), which
converts Ras to the active GTP-bound state. GRAP2 plays
an important role in T cell receptor (TCR) signaling by
promoting the formation of the SLP-76:LAT complex,
which couples the TCR to the Ras pathway. GRAP acts as
a negative regulator of T cell receptor (TCR)-induced
lymphocyte proliferation by downregulating the
signaling to the Ras/ERK pathway. The N-terminal SH3
domain of GRB2 binds to Sos and Sos-derived
proline-rich peptides. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 52
Score = 32.3 bits (74), Expect = 0.014
Identities = 14/39 (35%), Positives = 17/39 (43%), Gaps = 5/39 (12%)
Query: 20 SRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
+ A D+ T +D L F G IL V N DD W
Sbjct: 2 AVAKHDFKATAEDELS-----FKKGSILKVLNMEDDPNW 35
>gnl|CDD|212785 cd11851, SH3_RIM-BP, Src homology 3 domains of Rab3-interacting
molecules (RIMs) binding proteins. RIMs binding
proteins (RBPs, RIM-BPs) associate with calcium
channels present in photoreceptors, neurons, and hair
cells; they interact simultaneously with specific
calcium channel subunits, and active zone proteins,
RIM1 and RIM2. RIMs are part of the matrix at the
presynaptic active zone and are associated with
synaptic vesicles through their interaction with the
small GTPase Rab3. RIM-BPs play a role in regulating
synaptic transmission by serving as adaptors and
linking calcium channels with the synaptic vesicle
release machinery. RIM-BPs contain three SH3 domains
and two to three fibronectin III repeats. Invertebrates
contain one, while vertebrates contain at least two
RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called
peripheral-type benzodiazapine receptor associated
protein 1 (PRAX-1). Mammals contain a third protein,
RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly
expressed in the brain where they display overlapping
but distinct expression patterns, while RIM-BP3 is
almost exclusively expressed in the testis and is
essential in spermiogenesis. The SH3 domains of RIM-BPs
bind to the PxxP motifs of RIM1, RIM2, and L-type
(alpha1D) and N-type (alpha1B) calcium channel
subunits. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 62
Score = 32.7 bits (75), Expect = 0.014
Identities = 13/37 (35%), Positives = 19/37 (51%), Gaps = 2/37 (5%)
Query: 21 RALFDYDP--TKDDGLPSRGLPFHYGDILHVTNASDD 55
AL+DY+P + P L FH GD++ V D+
Sbjct: 3 VALYDYNPETMSPNDDPEEELSFHAGDVVRVYGPMDE 39
>gnl|CDD|212821 cd11888, SH3_ARHGAP9_like, Src Homology 3 domain of Rho
GTPase-activating protein 9 and similar proteins. This
subfamily is composed of Rho GTPase-activating proteins
including mammalian ARHGAP9, and vertebrate ARHGAPs 12
and 27. RhoGAPs (or ARHGAPs) bind to Rho proteins and
enhance the hydrolysis rates of bound GTP. ARHGAP9
functions as a GAP for Rac and Cdc42, but not for RhoA.
It negatively regulates cell migration and adhesion. It
also acts as a docking protein for the MAP kinases Erk2
and p38alpha, and may facilitate cross-talk between the
Rho GTPase and MAPK pathways to control actin
remodeling. ARHGAP27, also called CAMGAP1, shows GAP
activity towards Rac1 and Cdc42. It binds the adaptor
protein CIN85 and may play a role in clathrin-mediated
endocytosis. ARHGAP12 has been shown to display GAP
activity towards Rac1. It plays a role in regulating
HFG-driven cell growth and invasiveness. ARHGAPs in
this subfamily contain SH3, WW, Pleckstin homology
(PH), and RhoGAP domains. SH3 domains bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs; they play a
role in the regulation of enzymes by intramolecular
interactions, changing the subcellular localization of
signal pathway components and mediate multiprotein
complex assemblies.
Length = 54
Score = 32.3 bits (74), Expect = 0.015
Identities = 13/42 (30%), Positives = 21/42 (50%), Gaps = 3/42 (7%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARR 62
L+ ++ T DG R + G+ + S+D+WWQ RR
Sbjct: 3 VVLYPFEYTGKDG---RKVSIKEGERFLLLKKSNDDWWQVRR 41
>gnl|CDD|212701 cd11767, SH3_Nck_3, Third Src Homology 3 domain of Nck adaptor
proteins. This group contains the third SH3 domain of
Nck, the first SH3 domain of Caenorhabditis elegans
Ced-2 (Cell death abnormality protein 2), and similar
domains. Nck adaptor proteins regulate actin
cytoskeleton dynamics by linking proline-rich effector
molecules to protein tyrosine kinases and
phosphorylated signaling intermediates. They contain
three SH3 domains and a C-terminal SH2 domain. They
function downstream of the PDGFbeta receptor and are
involved in Rho GTPase signaling and actin dynamics.
Vertebrates contain two Nck adaptor proteins: Nck1
(also called Nckalpha) and Nck2 (also called Nckbeta or
Growth factor receptor-bound protein 4, Grb4), which
show partly overlapping functions but also bind
distinct targets. Their SH3 domains are involved in
recruiting downstream effector molecules, such as the
N-WASP/Arp2/3 complex, which when activated induces
actin polymerization that results in the production of
pedestals, or protrusions of the plasma membrane. The
third SH3 domain of Nck appears to prefer ligands with
a PxAPxR motif. SH3 domains are protein interaction
domains that usually bind to proline-rich ligands with
moderate affinity and selectivity, preferentially a
PxxP motif. Ced-2 is a cell corpse engulfment protein
that interacts with Ced-5 in a pathway that regulates
the activation of Ced-10, a Rac small GTPase.
Length = 56
Score = 32.3 bits (74), Expect = 0.018
Identities = 13/41 (31%), Positives = 19/41 (46%), Gaps = 7/41 (17%)
Query: 39 LPFHYGDILHVTN--ASDDEWWQARRVLPSGDEQGIGIVPS 77
L F G+ L + D +WW+AR L + G+VP
Sbjct: 16 LSFEKGERLEIIEKPEDDPDWWKARNALGT-----TGLVPR 51
>gnl|CDD|212792 cd11858, SH3_Myosin-I_fungi, Src homology 3 domain of Type I
fungal Myosins. Type I myosins (myosin-I) are
actin-dependent motors in endocytic actin structures
and actin patches. They play roles in membrane traffic
in endocytic and secretory pathways, cell motility, and
mechanosensing. Saccharomyces cerevisiae has two
myosins-I, Myo3 and Myo5, which are involved in
endocytosis and the polarization of the actin
cytoskeleton. Myosin-I contains an N-terminal
actin-activated ATPase, a phospholipid-binding TH1
(tail homology 1) domain, and a C-terminal extension
which includes an F-actin-binding TH2 domain, an SH3
domain, and an acidic peptide that participates in
activating the Arp2/3complex. The SH3 domain of
myosin-I is required for myosin-I-induced actin
polymerization. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 55
Score = 32.4 bits (74), Expect = 0.019
Identities = 16/57 (28%), Positives = 28/57 (49%), Gaps = 9/57 (15%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
+AL+D+ G + L DI+++ D+ WW A+++ DE G VP+
Sbjct: 3 KALYDFA-----GSVANELSLKKDDIVYIVQKEDNGWWLAKKL----DESKEGWVPA 50
>gnl|CDD|212757 cd11823, SH3_Nostrin, Src homology 3 domain of Nitric Oxide
Synthase TRaffic INducer. Nostrin is expressed in
endothelial and epithelial cells and is involved in the
regulation, trafficking and targeting of endothelial
NOS (eNOS). It facilitates the endocytosis of eNOS by
coordinating the functions of dynamin and the
Wiskott-Aldrich syndrome protein (WASP). Increased
expression of Nostrin may be correlated to
preeclampsia. Nostrin contains an N-terminal F-BAR
domain and a C-terminal SH3 domain. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 32.3 bits (74), Expect = 0.019
Identities = 13/39 (33%), Positives = 18/39 (46%), Gaps = 5/39 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQ 59
+AL+ Y ++D L GDI+ V DD WW
Sbjct: 3 KALYSYTANREDELS-----LQPGDIIEVHEKQDDGWWL 36
>gnl|CDD|212704 cd11770, SH3_Nephrocystin, Src Homology 3 domain of Nephrocystin
(or Nephrocystin-1). Nephrocystin contains an SH3
domain involved in signaling pathways that regulate
cell adhesion and cytoskeletal organization. It is a
protein that in humans is associated with juvenile
nephronophthisis, an inherited kidney disease
characterized by renal fibrosis that lead to chronic
renal failure in children. It is localized in cell-cell
junctions in renal duct cells, and is known to interact
with Ack1, an activated Cdc42-associated kinase. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 54
Score = 32.3 bits (74), Expect = 0.020
Identities = 12/39 (30%), Positives = 18/39 (46%), Gaps = 5/39 (12%)
Query: 39 LPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
L F G++L + + D WW A G+ G+VP
Sbjct: 16 LSFKKGEVLRIISKRADGWWLAEN--SKGNR---GLVPK 49
>gnl|CDD|212992 cd12059, SH3_MLK1-3, Src Homology 3 domain of Mixed Lineage
Kinases 1, 2, and 3. MLKs 1, 2, and 3 are
Serine/Threonine Kinases (STKs), catalyzing the
transfer of the gamma-phosphoryl group from ATP to S/T
residues on protein substrates. MLKs act as
mitogen-activated protein kinase kinase kinases
(MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and
activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which
in turn phosphorylate and activate MAPKs during
signaling cascades that are important in mediating
cellular responses to extracellular signals. MLKs play
roles in immunity and inflammation, as well as in cell
death, proliferation, and cell cycle regulation. Little
is known about the specific function of MLK1, also
called MAP3K9. It is capable of activating the c-Jun
N-terminal kinase pathway. Mice lacking both MLK1 and
MLK2 are viable, fertile, and have normal life spans.
MLK2, also called MAP3K10, is abundant in brain,
skeletal muscle, and testis. It functions upstream of
the MAPK, c-Jun N-terminal kinase. It binds
hippocalcin, a calcium-sensor protein that protects
neurons against calcium-induced cell death. Both MLK2
and hippocalcin may be associated with the pathogenesis
of Parkinson's disease. MLK3, also called MAP3K11, is
highly expressed in breast cancer cells and its
signaling through c-Jun N-terminal kinase has been
implicated in the migration, invasion, and malignancy
of cancer cells. It also functions as a negative
regulator of Inhibitor of Nuclear Factor-KappaB Kinase
(IKK) and thus, impacts inflammation and immunity. MLKs
contain an SH3 domain, a catalytic kinase domain, a
leucine zipper, a proline-rich region, and a CRIB
domain that mediates binding to GTP-bound Cdc42 and
Rac. SH3 domains are protein interaction domains that
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 58
Score = 32.0 bits (73), Expect = 0.022
Identities = 18/60 (30%), Positives = 27/60 (45%), Gaps = 14/60 (23%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHV----TNASDDEWWQARRVLPSGDEQGIGIVPS 77
A+FDY+ + +D L R GD + V + S DE W ++ +GI PS
Sbjct: 4 AVFDYEASAEDELTLR-----RGDRVEVLSKDSAVSGDEGWWTGKI-----NDRVGIFPS 53
>gnl|CDD|212751 cd11817, SH3_Eve1_4, Fourth Src homology 3 domain of ADAM-binding
protein Eve-1. Eve-1, also called SH3
domain-containing protein 19 (SH3D19) or EEN-binding
protein (EBP), exists in multiple alternatively spliced
isoforms. The longest isoform contains five SH3 domain
in the C-terminal region and seven proline-rich motifs
in the N-terminal region. It is abundantly expressed in
skeletal muscle and heart, and may be involved in
regulating the activity of ADAMs (A disintegrin and
metalloproteases). Eve-1 interacts with EEN, an
endophilin involved in endocytosis and may be the
target of the MLL-EEN fusion protein that is implicated
in leukemogenesis. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 50
Score = 31.7 bits (72), Expect = 0.024
Identities = 20/57 (35%), Positives = 27/57 (47%), Gaps = 13/57 (22%)
Query: 22 ALFDYD-PTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
AL+D+ T++D L F GD + VT D EW + R +G E GI P
Sbjct: 4 ALYDFTGETEED------LSFQRGDRILVTEHLDAEWSRGRL---NGRE---GIFPR 48
>gnl|CDD|212938 cd12005, SH3_Lck, Src homology 3 domain of Lck Protein Tyrosine
Kinase. Lck is a member of the Src subfamily of
proteins, which are cytoplasmic (or non-receptor) PTKs.
Lck is expressed in T-cells and natural killer cells.
It plays a critical role in T-cell maturation,
activation, and T-cell receptor (TCR) signaling. Lck
phosphorylates ITAM (immunoreceptor tyr activation
motif) sequences on several subunits of TCRs, leading
to the activation of different second messenger
cascades. Phosphorylated ITAMs serve as binding sites
for other signaling factor such as Syk and ZAP-70,
leading to their activation and propagation of
downstream events. In addition, Lck regulates
drug-induced apoptosis by interfering with the
mitochondrial death pathway. The apototic role of Lck
is independent of its primary function in T-cell
signaling. Src kinases contain an N-terminal SH4 domain
with a myristoylation site, followed by SH3 and SH2
domains, a tyr kinase domain, and a regulatory
C-terminal region containing a conserved tyr. They are
activated by autophosphorylation at the tyr kinase
domain, but are negatively regulated by phosphorylation
at the C-terminal tyr by Csk (C-terminal Src Kinase).
The SH3 domain of Src kinases contributes to substrate
recruitment by binding adaptor proteins/substrates, and
regulation of kinase activity through an intramolecular
interaction. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 54
Score = 31.7 bits (72), Expect = 0.030
Identities = 18/55 (32%), Positives = 27/55 (49%), Gaps = 10/55 (18%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
AL+ Y+P+ D L F G+ L + EWW+A+ L +G E G +P
Sbjct: 4 ALYSYEPSHDG-----DLGFEKGEKLRILE-QSGEWWKAQS-LTTGQE---GFIP 48
>gnl|CDD|212839 cd11906, SH3_BTK, Src Homology 3 domain of Bruton's tyrosine
kinase. BTK is a cytoplasmic (or nonreceptor) tyr
kinase containing Src homology protein interaction
domains (SH3, SH2) N-terminal to the catalytic tyr
kinase domain. It also contains an N-terminal
pleckstrin homology (PH) domain, which binds the
products of PI3K and allows membrane recruitment and
activation, and the Tec homology (TH) domain with
proline-rich and zinc-binding regions. Btk is expressed
in B-cells, and a variety of myeloid cells including
mast cells, platelets, neutrophils, and dendrictic
cells. It interacts with a variety of partners, from
cytosolic proteins to nuclear transcription factors,
suggesting a diversity of functions. Stimulation of a
diverse array of cell surface receptors, including
antigen engagement of the B-cell receptor (BCR), leads
to PH-mediated membrane translocation of Btk and
subsequent phosphorylation by Src kinase and
activation. Btk plays an important role in the life
cycle of B-cells including their development,
differentiation, proliferation, survival, and
apoptosis. Mutations in Btk cause the primary
immunodeficiency disease, X-linked agammaglobulinaemia
(XLA) in humans. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 55
Score = 31.7 bits (72), Expect = 0.031
Identities = 18/58 (31%), Positives = 25/58 (43%), Gaps = 14/58 (24%)
Query: 22 ALFDYDP-TKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGI-GIVPS 77
AL+DY P D L G+ + S+ WW+AR D+ G G +PS
Sbjct: 5 ALYDYTPMNAQD------LQLRKGEEYVILEESNLPWWRAR------DKNGREGYIPS 50
>gnl|CDD|212700 cd11766, SH3_Nck_2, Second Src Homology 3 domain of Nck adaptor
proteins. Nck adaptor proteins regulate actin
cytoskeleton dynamics by linking proline-rich effector
molecules to protein tyrosine kinases and
phosphorylated signaling intermediates. They contain
three SH3 domains and a C-terminal SH2 domain. They
function downstream of the PDGFbeta receptor and are
involved in Rho GTPase signaling and actin dynamics.
Vertebrates contain two Nck adaptor proteins: Nck1
(also called Nckalpha) and Nck2 (also called Nckbeta or
Growth factor receptor-bound protein 4, Grb4), which
show partly overlapping functions but also bind
distinct targets. Their SH3 domains are involved in
recruiting downstream effector molecules, such as the
N-WASP/Arp2/3 complex, which when activated induces
actin polymerization that results in the production of
pedestals, or protrusions of the plasma membrane. The
second SH3 domain of Nck appears to prefer ligands
containing the APxxPxR motif. SH3 domains are protein
interaction domains that usually bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially a PxxP motif. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 31.5 bits (72), Expect = 0.034
Identities = 12/41 (29%), Positives = 18/41 (43%), Gaps = 5/41 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
F+Y+ ++D L R GD + V S D WW+
Sbjct: 3 VVKFNYEAQREDELSLRK-----GDRVLVLEKSSDGWWRGE 38
>gnl|CDD|212714 cd11780, SH3_Sorbs_3, Third (or C-terminal) Src Homology 3 domain
of Sorbin and SH3 domain containing (Sorbs) proteins
and similar domains. This family, also called the
vinexin family, is composed predominantly of adaptor
proteins containing one sorbin homology (SoHo) and
three SH3 domains. Members include the third SH3
domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2),
Vinexin (or Sorbs3), and similar domains. They are
involved in the regulation of cytoskeletal
organization, cell adhesion, and growth factor
signaling. Members of this family bind multiple
partners including signaling molecules like c-Abl,
c-Arg, Sos, and c-Cbl, as well as cytoskeletal
molecules such as vinculin and afadin. They may have
overlapping functions. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 55
Score = 31.5 bits (72), Expect = 0.038
Identities = 19/56 (33%), Positives = 24/56 (42%), Gaps = 9/56 (16%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
RAL+ Y P +D L R GDI++V DD W+ V S G P
Sbjct: 3 RALYSYTPQNEDELELRE-----GDIVYVMEKCDDGWF----VGTSERTGLFGTFP 49
>gnl|CDD|212783 cd11849, SH3_SPIN90, Src homology 3 domain of SH3 protein
interacting with Nck, 90 kDa (SPIN90). SPIN90 is also
called NCK interacting protein with SH3 domain
(NCKIPSD), Dia-interacting protein (DIP), 54 kDa
vimentin-interacting protein (VIP54), or
WASP-interacting SH3-domain protein (WISH). It is an
F-actin binding protein that regulates actin
polymerization and endocytosis. It associates with the
Arp2/3 complex near actin filaments and determines
filament localization at the leading edge of
lamellipodia. SPIN90 is expressed in the early stages
of neuronal differentiation and plays a role in
regulating growth cone dynamics and neurite outgrowth.
It also interacts with IRSp53 and regulates cell
motility by playing a role in the formation of membrane
protrusions. SPIN90 contains an N-terminal SH3 domain,
a proline-rich domain, and a C-terminal VCA
(verprolin-homology and cofilin-like acidic) domain.
SH3 domains are protein interaction domains that bind
to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 31.1 bits (71), Expect = 0.040
Identities = 15/58 (25%), Positives = 23/58 (39%), Gaps = 10/58 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
RAL+D+ + L F G+ + S+ WW SG+ G VP+
Sbjct: 3 RALYDFKSAE-----PNTLSFSEGETFLLLERSNAHWWLVTNH--SGE---TGYVPAN 50
>gnl|CDD|212929 cd11996, SH3_Intersectin2_5, Fifth Src homology 3 domain (or
SH3E) of Intersectin-2. Intersectin-2 (ITSN2) is an
adaptor protein that functions in exo- and endocytosis,
actin cytoskeletal reorganization, and signal
transduction. It plays a role in clathrin-coated pit
(CCP) formation. It binds to many proteins through its
multidomain structure and facilitate the assembly of
multimeric complexes. ITSN2 also functions as a
specific GEF for Cdc42 activation in epithelial
morphogenesis, and is required in mitotic spindle
orientation. It exists in alternatively spliced short
and long isoforms. The short isoform contains two Eps15
homology domains (EH1 and EH2), a coiled-coil region
and five SH3 domains (SH3A-E), while the long isoform,
in addition, contains RhoGEF (also called
Dbl-homologous or DH), Pleckstrin homology (PH) and C2
domains. The fifth SH3 domain (or SH3E) of ITSN2 is
expected to bind protein partners, similar to ITSN1
which has been shown to bind many protein partners
including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2,
N-WASP, and synaptojanin-1, among others. SH3 domains
are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 54
Score = 31.1 bits (70), Expect = 0.042
Identities = 18/57 (31%), Positives = 28/57 (49%), Gaps = 13/57 (22%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGI-GIVPS 77
A++DY +D L F G +++V N D +WWQ G+ G+ G+ PS
Sbjct: 5 AMYDYTANNEDELS-----FSKGQLINVLNKDDPDWWQ-------GEINGVTGLFPS 49
>gnl|CDD|212865 cd11932, SH3_SH3RF2_2, Second Src Homology 3 domain of SH3 domain
containing ring finger 2. SH3RF2 is also called POSHER
(POSH-eliminating RING protein) or HEPP1 (heart protein
phosphatase 1-binding protein). It acts as an
anti-apoptotic regulator of the JNK pathway by binding
to and promoting the degradation of SH3RF1 (or POSH), a
scaffold protein that is required for pro-apoptotic JNK
activation. It may also play a role in cardiac
functions together with protein phosphatase 1. SH3RF2
contains an N-terminal RING finger domain and three SH3
domains. This model represents the second SH3 domain,
located C-terminal of the first SH3 domain at the
N-terminal half, of SH3RF2. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 57
Score = 31.3 bits (71), Expect = 0.045
Identities = 16/53 (30%), Positives = 26/53 (49%), Gaps = 5/53 (9%)
Query: 21 RALFDYD-PTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGI 72
RAL+++D K+ L F DI+ V + D+ W + + GD+ GI
Sbjct: 3 RALYNFDLKEKNREESKDCLKFQKDDIITVISRVDENWAEGKL----GDQVGI 51
>gnl|CDD|212774 cd11840, SH3_Intersectin_5, Fifth Src homology 3 domain (or SH3E)
of Intersectin. Intersectins (ITSNs) are adaptor
proteins that function in exo- and endocytosis, actin
cytoskeletal reorganization, and signal transduction.
They are essential for initiating clathrin-coated pit
formation. They bind to many proteins through their
multidomain structure and facilitate the assembly of
multimeric complexes. Vertebrates contain two ITSN
proteins, ITSN1 and ITSN2, which exist in alternatively
spliced short and long isoforms. The short isoforms
contain two Eps15 homology domains (EH1 and EH2), a
coiled-coil region and five SH3 domains (SH3A-E), while
the long isoforms, in addition, contain RhoGEF (also
called Dbl-homologous or DH), Pleckstrin homology (PH)
and C2 domains. ITSN1 and ITSN2 are both widely
expressed, with variations depending on tissue type and
stage of development. The fifth SH3 domain (or SH3E) of
ITSN1 has been shown to bind many protein partners
including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2,
N-WASP, and synaptojanin-1, among others. SH3 domains
are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 31.2 bits (71), Expect = 0.047
Identities = 14/39 (35%), Positives = 20/39 (51%), Gaps = 5/39 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQ 59
ALF Y +D L F GDI++V + D +WW+
Sbjct: 3 IALFPYTAQNEDELS-----FQKGDIINVLSKDDPDWWR 36
>gnl|CDD|212989 cd12056, SH3_CD2AP_3, Third Src Homology 3 domain (SH3C) of
CD2-associated protein. CD2AP, also called CMS (Cas
ligand with Multiple SH3 domains) or METS1
(Mesenchyme-to-Epithelium Transition protein with SH3
domains), is a cytosolic adaptor protein that plays a
role in regulating the cytoskeleton. It is critical in
cell-to-cell union necessary for kidney function. It
also stabilizes the contact between a T cell and
antigen-presenting cells. It is primarily expressed in
podocytes at the cytoplasmic face of the slit diaphragm
and serves as a linker anchoring podocin and nephrin to
the actin cytoskeleton. CD2AP contains three SH3
domains, a proline-rich region, and a C-terminal
coiled-coil domain. All of these domains enable CD2AP
to bind various protein partners and assemble complexes
that have been implicated in many different functions.
This alignment model represents the third SH3 domain
(SH3C) of CD2AP. SH3C has been shown to bind ubiquitin.
SH3 domains are protein interaction domains that bind
to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 57
Score = 31.3 bits (71), Expect = 0.048
Identities = 12/43 (27%), Positives = 22/43 (51%), Gaps = 7/43 (16%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVT--NASDDEWWQ 59
+ +ALF Y+ T +D L F G+I+ + + + WW+
Sbjct: 3 YCKALFHYEGTNED-----ELDFKEGEIILIISKDTGEPGWWK 40
>gnl|CDD|213018 cd12142, SH3_D21-like, Src Homology 3 domain of SH3
domain-containing protein 21 (SH3D21) and similar
proteins. N-terminal SH3 domain of the uncharacterized
protein SH3 domain-containing protein 21, and similar
uncharacterized domains, it belongs to the CD2AP-like_3
subfamily of proteins. The CD2AP-like_3 subfamily is
composed of the third SH3 domain (SH3C) of CD2AP, CIN85
(Cbl-interacting protein of 85 kDa), and similar
domains. CD2AP and CIN85 are adaptor proteins that bind
to protein partners and assemble complexes that have
been implicated in T cell activation, kidney function,
and apoptosis of neuronal cells. They also associate
with endocytic proteins, actin cytoskeleton components,
and other adaptor proteins involved in receptor
tyrosine kinase (RTK) signaling. CD2AP and the main
isoform of CIN85 contain three SH3 domains, a
proline-rich region, and a C-terminal coiled-coil
domain. All of these domains enable CD2AP and CIN85 to
bind various protein partners and assemble complexes
that have been implicated in many different functions.
SH3C of both proteins have been shown to bind to
ubiquitin. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 55
Score = 31.3 bits (71), Expect = 0.048
Identities = 14/41 (34%), Positives = 21/41 (51%), Gaps = 7/41 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNAS--DDEWWQ 59
R LFDY+P D L + GD++ V + D+ WW+
Sbjct: 3 RVLFDYNPVAPDELALK-----KGDVIEVISKETEDEGWWE 38
>gnl|CDD|212961 cd12028, SH3_ZO-3, Src homology 3 domain of the Tight junction
protein, Zonula occludens protein 3. ZO-3 is a
scaffolding protein that associates with other ZO
proteins and other proteins of the tight junction,
zonula adherens, and gap junctions. ZO proteins play
roles in regulating cytoskeletal dynamics at these cell
junctions. ZO-3 is critical for epidermal barrier
function. It regulates cyclin D1-dependent cell
proliferation. It is considered a member of the MAGUK
(membrane-associated guanylate kinase) protein family,
which is characterized by the presence of a core of
three domains: PDZ, SH3, and guanylate kinase (GuK).
The GuK domain in MAGUK proteins is enzymatically
inactive; instead, the domain mediates protein-protein
interactions and associates intramolecularly with the
SH3 domain. The C-terminal region of ZO-3 is the
smallest of the three ZO proteins. The SH3 domain of
the related protein ZO-1 has been shown to bind ZONAB,
ZAK, afadin, and Galpha12. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 65
Score = 31.4 bits (71), Expect = 0.048
Identities = 22/63 (34%), Positives = 29/63 (46%), Gaps = 4/63 (6%)
Query: 21 RALFDYDPTKDDGLP-SRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKK 79
R FDY+P GL +RG FH D +H W A R+ E GI+P++
Sbjct: 6 RTHFDYEPDPPSGLSFTRGEVFHVLDTMHRGKLGS---WLAVRMGRDLREMEKGIIPNQS 62
Query: 80 RWE 82
R E
Sbjct: 63 RAE 65
>gnl|CDD|212890 cd11957, SH3_RUSC2, Src homology 3 domain of RUN and SH3
domain-containing protein 2. RUSC2, also called Iporin
or Interacting protein of Rab1, is expressed
ubiquitously with highest amounts in the brain and
testis. It interacts with the small GTPase Rab1 and the
Golgi matrix protein GM130, and may function in linking
GTPases to certain intracellular signaling pathways.
RUSC proteins are adaptor proteins consisting of RUN,
leucine zipper, and SH3 domains. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 52
Score = 31.0 bits (70), Expect = 0.051
Identities = 13/38 (34%), Positives = 20/38 (52%), Gaps = 6/38 (15%)
Query: 39 LPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
L F+ GDIL V + +D +W + G + G+VP
Sbjct: 16 LSFNKGDILQVLSRADGDWLRCSL----GPDS--GLVP 47
>gnl|CDD|213019 cd12143, SH3_ARHGAP9, Src Homology 3 domain of Rho
GTPase-activating protein 9 and similar proteins. Rho
GTPase-activating proteins (RhoGAPs or ARHGAPs) bind to
Rho proteins and enhance the hydrolysis rates of bound
GTP. ARHGAP9 functions as a GAP for Rac and Cdc42, but
not for RhoA. It negatively regulates cell migration
and adhesion. It also acts as a docking protein for the
MAP kinases Erk2 and p38alpha, and may facilitate
cross-talk between the Rho GTPase and MAPK pathways to
control actin remodeling. It contains SH3, WW,
Pleckstin homology (PH), and RhoGAP domains. SH3
domains bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs; they play a role in the regulation of enzymes
by intramolecular interactions, changing the
subcellular localization of signal pathway components
and mediate multiprotein complex assemblies.
Length = 57
Score = 31.0 bits (70), Expect = 0.051
Identities = 13/42 (30%), Positives = 21/42 (50%), Gaps = 3/42 (7%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRV 63
AL+ Y T DG R + G+ + ++ +WWQ RR+
Sbjct: 4 ALYAYQYTGADG---RQVSIAEGERFLLLRKTNSDWWQVRRL 42
>gnl|CDD|212763 cd11829, SH3_GAS7, Src homology 3 domain of Growth Arrest
Specific protein 7. GAS7 is mainly expressed in the
brain and is required for neurite outgrowth. It may
also play a role in the protection and migration of
embryonic stem cells. Treatment-related acute myeloid
leukemia (AML) has been reported resulting from
mixed-lineage leukemia (MLL)-GAS7 translocations as a
complication of primary cancer treatment. GAS7 contains
an N-terminal SH3 domain, followed by a WW domain, and
a central F-BAR domain. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 52
Score = 30.6 bits (69), Expect = 0.062
Identities = 11/44 (25%), Positives = 20/44 (45%), Gaps = 4/44 (9%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARR 62
R L+ + + +GL F G+++ V A D WW+ +
Sbjct: 1 LCRTLYAFTGEQHQ----QGLSFEAGELIRVLQAPDGGWWEGEK 40
>gnl|CDD|212740 cd11806, SH3_PRMT2, Src homology 3 domain of Protein arginine
N-methyltransferase 2. PRMT2, also called HRMT1L1,
belongs to the arginine methyltransferase protein
family. It functions as a coactivator to both estrogen
receptor alpha (ER-alpha) and androgen receptor (AR),
presumably through arginine methylation. The ER-alpha
transcription factor is involved in cell proliferation,
differentiation, morphogenesis, and apoptosis, and is
also implicated in the development and progression of
breast cancer. PRMT2 and its variants are upregulated
in breast cancer cells and may be involved in
modulating the ER-alpha signaling pathway during
formation of breast cancer. PRMT2 also plays a role in
regulating the function of E2F transcription factors,
which are critical cell cycle regulators, by binding to
the retinoblastoma gene product (RB). It contains an
N-terminal SH3 domain and an AdoMet binding domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 30.8 bits (70), Expect = 0.064
Identities = 13/41 (31%), Positives = 16/41 (39%), Gaps = 5/41 (12%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARR 62
A+ D+ T D L F GD L V +WW A
Sbjct: 4 AIADFVATDDSQLS-----FESGDKLLVLRKPSVDWWWAEH 39
>gnl|CDD|212887 cd11954, SH3_ASPP1, Src Homology 3 domain of Apoptosis
Stimulating of p53 protein 1. ASPP1, like ASPP2,
activates the apoptotic function of the p53 family of
tumor suppressors (p53, p63, and p73). In addition, it
functions in the cytoplasm to regulate the nuclear
localization of the transcriptional cofactors YAP and
TAZ by inihibiting their phosphorylation; YAP and TAZ
are important regulators of cell expansion,
differentiation, migration, and invasion. ASPP1 is
downregulated in breast tumors expressing wild-type
p53. It contains a proline-rich region, four ankyrin
(ANK) repeats, and an SH3 domain at its C-terminal
half. The SH3 domain and the ANK repeats of ASPP1
contribute to the p53 binding site; they bind to the
DNA binding domain of p53. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 57
Score = 30.4 bits (68), Expect = 0.087
Identities = 18/53 (33%), Positives = 24/53 (45%), Gaps = 12/53 (22%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDD---EWWQARRVLPSGDEQG 71
AL+DY+ D L F GD + + DD EWW AR D++G
Sbjct: 5 ALWDYEAQNADELS-----FQEGDAITILRRKDDSETEWWWARL----NDKEG 48
>gnl|CDD|212807 cd11874, SH3_CD2AP-like_2, Second Src Homology 3 domain (SH3B) of
CD2-associated protein and similar proteins. This
subfamily is composed of the second SH3 domain (SH3B)
of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa),
and similar domains. CD2AP and CIN85 are adaptor
proteins that bind to protein partners and assemble
complexes that have been implicated in T cell
activation, kidney function, and apoptosis of neuronal
cells. They also associate with endocytic proteins,
actin cytoskeleton components, and other adaptor
proteins involved in receptor tyrosine kinase (RTK)
signaling. CD2AP and the main isoform of CIN85 contain
three SH3 domains, a proline-rich region, and a
C-terminal coiled-coil domain. All of these domains
enable CD2AP and CIN85 to bind various protein partners
and assemble complexes that have been implicated in
many different functions. SH3B of both proteins have
been shown to bind to Cbl. In the case of CD2AP, its
SH3B binds to Cbl at a site distinct from the
c-Cbl/SH3A binding site. The CIN85 SH3B also binds
ubiquitin. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 30.0 bits (68), Expect = 0.10
Identities = 15/51 (29%), Positives = 22/51 (43%), Gaps = 10/51 (19%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARR-----VLPS 66
+ LF Y P +D L L GD + V ++ WW+ + V PS
Sbjct: 3 KVLFSYTPQNEDEL---ELKV--GDTIEVLGEVEEGWWEGKLNGKVGVFPS 48
>gnl|CDD|212907 cd11974, SH3_ASEF2, Src homology 3 domain of APC-Stimulated
guanine nucleotide Exchange Factor 2. ASEF2, also
called Spermatogenesis-associated protein 13 (SPATA13),
is a GEF that localizes with actin at the leading edge
of cells and is important in cell migration and
adhesion dynamics. GEFs activate small GTPases by
exchanging bound GDP for free GTP. ASEF2 can activate
both Rac 1 and Cdc42, but only Rac1 activation is
necessary for increased cell migration and adhesion
turnover. Together with APC (adenomatous polyposis
coli) and Neurabin2, a scaffold protein that binds
F-actin, it is involved in regulating HGF-induced cell
migration. ASEF2 contains a SH3 domain followed by
RhoGEF (also called Dbl-homologous or DH) and
Pleckstrin Homology (PH) domains. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 54
Score = 30.0 bits (67), Expect = 0.11
Identities = 16/43 (37%), Positives = 25/43 (58%), Gaps = 5/43 (11%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
++ AL+D+ T DD + L F GD++ V AS+ +WW R
Sbjct: 2 YAEALWDH-VTMDD----QELAFKAGDVIRVLEASNKDWWWGR 39
>gnl|CDD|212746 cd11812, SH3_AHI-1, Src Homology 3 domain of Abelson helper
integration site-1 (AHI-1). AHI-1, also called
Jouberin, is expressed in high levels in the brain,
gonad tissues, and skeletal muscle. It is an adaptor
protein that interacts with the small GTPase Rab8a and
regulates it distribution and function, affecting
cilium formation and vesicle transport. Mutations in
the AHI-1 gene can cause Joubert syndrome, a disorder
characterized by brainstem malformations, cerebellar
aplasia/hypoplasia, and retinal dystrophy. AHI-1
variation is also associated with susceptibility to
schizophrenia and type 2 diabetes mellitus progression.
AHI-1 contains WD40 and SH3 domains. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 52
Score = 29.8 bits (67), Expect = 0.12
Identities = 15/42 (35%), Positives = 19/42 (45%), Gaps = 5/42 (11%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRV 63
AL+DY + D L H GDI+ V +D WW V
Sbjct: 4 ALYDYTANRSDELT-----IHRGDIIRVLYKDNDNWWFGSLV 40
>gnl|CDD|212710 cd11776, SH3_PI3K_p85, Src Homology 3 domain of the p85
regulatory subunit of Class IA Phosphatidylinositol
3-kinases. Class I PI3Ks convert PtdIns(4,5)P2 to the
critical second messenger PtdIns(3,4,5)P3. They are
heterodimers and exist in multiple isoforms consisting
of one catalytic subunit (out of four isoforms) and one
of several regulatory subunits. Class IA PI3Ks
associate with the p85 regulatory subunit family, which
contains SH3, RhoGAP, and SH2 domains. The p85 subunits
recruit the PI3K p110 catalytic subunit to the
membrane, where p110 phosphorylates inositol lipids.
Vertebrates harbor two p85 isoforms, called alpha and
beta. SH3 domains are protein interaction domains that
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 72
Score = 30.6 bits (69), Expect = 0.12
Identities = 19/72 (26%), Positives = 30/72 (41%), Gaps = 16/72 (22%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSKKR 80
RAL+DY+ +D+ + GD+L V N +L G G VP +
Sbjct: 4 RALYDYEKERDE-----DIILKTGDVLVVENPE---------LLALGVPDGKETVPKPEG 49
Query: 81 W--ERKQRARDR 90
W + +R +R
Sbjct: 50 WLEGKNERTGER 61
>gnl|CDD|212790 cd11856, SH3_p47phox_like, Src homology 3 domains of the p47phox
subunit of NADPH oxidase and similar domains. This
family is composed of the tandem SH3 domains of p47phox
subunit of NADPH oxidase and Nox Organizing protein 1
(NoxO1), the four SH3 domains of Tks4 (Tyr kinase
substrate with four SH3 domains), the five SH3 domains
of Tks5, the SH3 domain of obscurin, Myosin-I, and
similar domains. Most members of this group also
contain Phox homology (PX) domains, except for obscurin
and Myosin-I. p47phox and NoxO1 are regulators of the
phagocytic NADPH oxidase complex (also called Nox2 or
gp91phox) and nonphagocytic NADPH oxidase Nox1,
respectively. They play roles in the activation of
their respective NADPH oxidase, which catalyzes the
transfer of electrons from NADPH to molecular oxygen to
form superoxide. Tks proteins are Src substrates and
scaffolding proteins that play important roles in the
formation of podosomes and invadopodia, the dynamic
actin-rich structures that are related to cell
migration and cancer cell invasion. Obscurin is a giant
muscle protein that plays important roles in the
organization and assembly of the myofibril and the
sarcoplasmic reticulum. Type I myosins (Myosin-I) are
actin-dependent motors in endocytic actin structures
and actin patches. They play roles in membrane traffic
in endocytic and secretory pathways, cell motility, and
mechanosensing. Myosin-I contains an N-terminal
actin-activated ATPase, a phospholipid-binding TH1
(tail homology 1) domain, and a C-terminal extension
which includes an F-actin-binding TH2 domain, an SH3
domain, and an acidic peptide that participates in
activating the Arp2/3complex. The SH3 domain of
myosin-I is required for myosin-I-induced actin
polymerization. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 29.9 bits (68), Expect = 0.13
Identities = 14/51 (27%), Positives = 24/51 (47%), Gaps = 9/51 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG 71
A+ DY+ DD + G+++ V +D WW R+ GD++G
Sbjct: 3 VAIADYEAQGDDEIS-----LQEGEVVEVLEKNDSGWWYVRK----GDKEG 44
>gnl|CDD|212822 cd11889, SH3_Cyk3p-like, Src Homology 3 domain of Cytokinesis
protein 3 and similar proteins. Cytokinesis protein 3
(Cyk3 or Cyk3p) is a component of the actomyosin ring
independent cytokinesis pathway in yeast. It interacts
with Inn1 and facilitates its recruitment to the bud
neck, thereby promoting cytokinesis. Cyk3p contains an
N-terminal SH3 domain and a C-terminal
transglutaminase-like domain. The Cyk3p SH3 domain
binds to the C-terminal proline-rich region of Inn1.
SH3 domains bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs; they play a role in the regulation of enzymes
by intramolecular interactions, changing the
subcellular localization of signal pathway components
and mediate multiprotein complex assemblies.
Length = 53
Score = 29.8 bits (67), Expect = 0.15
Identities = 9/29 (31%), Positives = 13/29 (44%)
Query: 33 GLPSRGLPFHYGDILHVTNASDDEWWQAR 61
G L F GD++ V + D WW +
Sbjct: 10 GETEGDLGFLEGDLIEVLSIGDGSWWSGK 38
>gnl|CDD|212908 cd11975, SH3_ARHGEF9, Src homology 3 domain of the Rho guanine
nucleotide exchange factor ARHGEF9. ARHGEF9, also
called PEM2 or collybistin, selectively activates Cdc42
by exchanging bound GDP for free GTP. It is highly
expressed in the brain and it interacts with gephyrin,
a postsynaptic protein associated with GABA and glycine
receptors. Mutations in the ARHGEF9 gene cause X-linked
mental retardation with associated features like
seizures, hyper-anxiety, aggressive behavior, and
sensory hyperarousal. ARHGEF9 contains a SH3 domain
followed by RhoGEF (also called Dbl-homologous or DH)
and Pleckstrin Homology (PH) domains. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 62
Score = 29.7 bits (66), Expect = 0.17
Identities = 10/25 (40%), Positives = 17/25 (68%)
Query: 34 LPSRGLPFHYGDILHVTNASDDEWW 58
+ +R L F GD++ V +AS+ +WW
Sbjct: 16 MANRELAFKAGDVIKVLDASNKDWW 40
>gnl|CDD|212761 cd11827, SH3_MyoIe_If_like, Src homology 3 domain of Myosins Ie,
If, and similar proteins. Myosins Ie (MyoIe) and If
(MyoIf) are nonmuscle, unconventional, long tailed,
class I myosins containing an N-terminal motor domain
and a myosin tail with TH1, TH2, and SH3 domains. MyoIe
interacts with the endocytic proteins, dynamin and
synaptojanin-1, through its SH3 domain; it may play a
role in clathrin-dependent endocytosis. In the kidney,
MyoIe is critical for podocyte function and normal
glomerular filtration. Mutations in MyoIe is associated
with focal segmental glomerulosclerosis, a disease
characterized by massive proteinuria and progression to
end-stage kidney disease. MyoIf is predominantly
expressed in the immune system; it plays a role in
immune cell motility and innate immunity. Mutations in
MyoIf may be associated with the loss of hearing. The
MyoIf gene has also been found to be fused to the MLL
(Mixed lineage leukemia) gene in infant acute myeloid
leukemias (AML). SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 29.3 bits (66), Expect = 0.18
Identities = 13/41 (31%), Positives = 18/41 (43%), Gaps = 5/41 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
+AL+ YD D L F+ GDI+ + WW R
Sbjct: 3 KALYAYDAQDTDELS-----FNEGDIIEILKEDPSGWWTGR 38
>gnl|CDD|212744 cd11810, SH3_RUSC1_like, Src homology 3 domain of RUN and SH3
domain-containing proteins 1 and 2. RUSC1 and RUSC2,
that were originally characterized in silico. They are
adaptor proteins consisting of RUN, leucine zipper, and
SH3 domains. RUSC1, also called NESCA (New molecule
containing SH3 at the carboxy-terminus), is highly
expressed in the brain and is translocated to the
nuclear membrane from the cytoplasm upon stimulation
with neurotrophin. It plays a role in facilitating
neurotrophin-dependent neurite outgrowth. It also
interacts with NEMO (or IKKgamma) and may function in
NEMO-mediated activation of NF-kB. RUSC2, also called
Iporin, is expressed ubiquitously with highest amounts
in the brain and testis. It interacts with the small
GTPase Rab1 and the Golgi matrix protein GM130, and may
function in linking GTPases to certain intracellular
signaling pathways. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 50
Score = 28.9 bits (65), Expect = 0.22
Identities = 14/37 (37%), Positives = 16/37 (43%), Gaps = 5/37 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEW 57
RAL + T L F GDIL V DD+W
Sbjct: 3 RALCHHVATDSGQLS-----FRKGDILRVIARVDDDW 34
>gnl|CDD|212808 cd11875, SH3_CD2AP-like_3, Third Src Homology 3 domain (SH3C) of
CD2-associated protein and similar proteins. This
subfamily is composed of the third SH3 domain (SH3C) of
CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and
similar domains. CD2AP and CIN85 are adaptor proteins
that bind to protein partners and assemble complexes
that have been implicated in T cell activation, kidney
function, and apoptosis of neuronal cells. They also
associate with endocytic proteins, actin cytoskeleton
components, and other adaptor proteins involved in
receptor tyrosine kinase (RTK) signaling. CD2AP and the
main isoform of CIN85 contain three SH3 domains, a
proline-rich region, and a C-terminal coiled-coil
domain. All of these domains enable CD2AP and CIN85 to
bind various protein partners and assemble complexes
that have been implicated in many different functions.
SH3C of both proteins have been shown to bind to
ubiquitin. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 55
Score = 29.2 bits (66), Expect = 0.25
Identities = 14/41 (34%), Positives = 20/41 (48%), Gaps = 7/41 (17%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTN--ASDDEWWQ 59
R LFDY+ +D L R GDI+ + + D WW+
Sbjct: 3 RVLFDYEAENEDELTLR-----EGDIVTILSKDCEDKGWWK 38
>gnl|CDD|212904 cd11971, SH3_Abi1, Src homology 3 domain of Abl Interactor 1.
Abi1, also called e3B1, is a central regulator of actin
cytoskeletal reorganization through interactions with
many protein complexes. It is part of WAVE, a
nucleation-promoting factor complex, that links Rac 1
activation to actin polymerization causing lamellipodia
protrusion at the plasma membrane. Abi1 interact with
formins to promote protrusions at the leading edge of
motile cells. It also is a target of alpha4 integrin,
regulating membrane protrusions at sites of integrin
engagement. Abi proteins are adaptor proteins serving
as binding partners and substrates of Abl tyrosine
kinases. They are involved in regulating actin
cytoskeletal reorganization and play important roles in
membrane-ruffling, endocytosis, cell motility, and cell
migration. Abi proteins contain a homeobox homology
domain, a proline-rich region, and a SH3 domain. The
SH3 domain of Abi binds to a PxxP motif in Abl. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 59
Score = 29.2 bits (65), Expect = 0.25
Identities = 14/39 (35%), Positives = 21/39 (53%), Gaps = 5/39 (12%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQA 60
A++DY KDD L F G I++V +DD W++
Sbjct: 4 AIYDYSKDKDDELS-----FMEGAIIYVIKKNDDGWYEG 37
>gnl|CDD|212946 cd12013, SH3_RIM-BP_3, Third Src homology 3 domain of
Rab3-interacting molecules (RIMs) binding proteins.
RIMs binding proteins (RBPs, RIM-BPs) associate with
calcium channels present in photoreceptors, neurons,
and hair cells; they interact simultaneously with
specific calcium channel subunits, and active zone
proteins, RIM1 and RIM2. RIMs are part of the matrix at
the presynaptic active zone and are associated with
synaptic vesicles through their interaction with the
small GTPase Rab3. RIM-BPs play a role in regulating
synaptic transmission by serving as adaptors and
linking calcium channels with the synaptic vesicle
release machinery. RIM-BPs contain three SH3 domains
and two to three fibronectin III repeats. Invertebrates
contain one, while vertebrates contain at least two
RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called
peripheral-type benzodiazapine receptor associated
protein 1 (PRAX-1). Mammals contain a third protein,
RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly
expressed in the brain where they display overlapping
but distinct expression patterns, while RIM-BP3 is
almost exclusively expressed in the testis and is
essential in spermiogenesis. The SH3 domains of RIM-BPs
bind to the PxxP motifs of RIM1, RIM2, and L-type
(alpha1D) and N-type (alpha1B) calcium channel
subunits. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 61
Score = 29.3 bits (66), Expect = 0.27
Identities = 14/38 (36%), Positives = 18/38 (47%), Gaps = 2/38 (5%)
Query: 21 RALFDYDPTKDDGLP--SRGLPFHYGDILHVTNASDDE 56
ALFDYDP + L F GDI+ V D++
Sbjct: 3 VALFDYDPRESSPNVDAEVELSFRAGDIITVFGEMDED 40
>gnl|CDD|212767 cd11833, SH3_Stac_1, First C-terminal Src homology 3 domain of
SH3 and cysteine-rich domain-containing (Stac)
proteins. Stac proteins are putative adaptor proteins
that contain a cysteine-rich C1 domain and one or two
SH3 domains at the C-terminus. There are three
mammalian members (Stac1, Stac2, and Stac3) of this
family. Stac1 and Stac3 contain two SH3 domains while
Stac2 contains a single SH3 domain at the C-terminus.
This model represents the first C-terminal SH3 domain
of Stac1 and Stac3, and the single C-terminal SH3
domain of Stac2. Stac1 and Stac2 have been found to be
expressed differently in mature dorsal root ganglia
(DRG) neurons. Stac1 is mainly expressed in peptidergic
neurons while Stac2 is found in a subset of
nonpeptidergic and all trkB+ neurons. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 28.6 bits (64), Expect = 0.33
Identities = 13/57 (22%), Positives = 28/57 (49%), Gaps = 11/57 (19%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
AL+ + P +++ L R GD + + + S+++WW+ + E +G P+
Sbjct: 4 ALYKFKPQENEDLEMRP-----GDKITLLDDSNEDWWKGKI------EDRVGFFPAN 49
>gnl|CDD|212889 cd11956, SH3_srGAP4, Src homology 3 domain of Slit-Robo GTPase
Activating Protein 4. srGAP4, also called ARHGAP4, is
highly expressed in hematopoietic cells and may play a
role in lymphocyte differentiation. It is able to
stimulate the GTPase activity of Rac1, Cdc42, and RhoA.
In the nervous system, srGAP4 has been detected in
differentiating neurites and may be involved in axon
and dendritic growth. srGAPs are Rho GAPs that interact
with Robo1, the transmembrane receptor of Slit
proteins. Slit proteins are secreted proteins that
control axon guidance and the migration of neurons and
leukocytes. srGAPs contain an N-terminal F-BAR domain,
a Rho GAP domain, and a C-terminal SH3 domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 55
Score = 28.7 bits (64), Expect = 0.40
Identities = 17/58 (29%), Positives = 29/58 (50%), Gaps = 13/58 (22%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGI-GIVPSK 78
A FDY G ++ L F GD+L + + + +WW+ G+ G+ G++P K
Sbjct: 6 ACFDYT-----GRTAQELSFKRGDVLLLHSKASSDWWR-------GEHNGMRGLIPHK 51
>gnl|CDD|212691 cd11757, SH3_SH3BP4, Src Homology 3 domain of SH3 domain-binding
protein 4. SH3 domain-binding protein 4 (SH3BP4) is
also called transferrin receptor trafficking protein
(TTP). SH3BP4 is an endocytic accessory protein that
interacts with endocytic proteins including clathrin
and dynamin, and regulates the internalization of the
transferrin receptor (TfR). SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 52
Score = 28.4 bits (63), Expect = 0.42
Identities = 19/56 (33%), Positives = 25/56 (44%), Gaps = 11/56 (19%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
A+ DY PT L F GD L+V + S EWW A + +G +PS
Sbjct: 4 AIKDYCPTN-----FTTLKFSKGDHLYVLDTSGGEWWYAH------NTTEMGYIPS 48
>gnl|CDD|212742 cd11808, SH3_Alpha_Spectrin, Src homology 3 domain of Alpha
Spectrin. Spectrin is a major structural component of
the red blood cell membrane skeleton and is important
in erythropoiesis and membrane biogenesis. It is a
flexible, rope-like molecule composed of two subunits,
alpha and beta, which consist of many spectrin-type
repeats. Alpha and beta spectrin associate to form
heterodimers and tetramers; spectrin tetramer formation
is critical for red cell shape and deformability.
Defects in alpha spectrin have been associated with
inherited hemolytic anemias including hereditary
spherocytosis (HSp), hereditary elliptocytosis (HE),
and hereditary pyropoikilocytosis (HPP). Alpha spectrin
contains a middle SH3 domain and a C-terminal EF-hand
binding motif in addition to multiple spectrin repeats.
SH3 domains are protein interaction domains that bind
to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 28.2 bits (63), Expect = 0.43
Identities = 16/50 (32%), Positives = 24/50 (48%), Gaps = 9/50 (18%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG 71
AL+DY R + GDIL + N+S+ +WW+ + D QG
Sbjct: 4 ALYDYQEKS-----PREVSMKKGDILTLLNSSNKDWWK----VEVNDRQG 44
>gnl|CDD|212905 cd11972, SH3_Abi2, Src homology 3 domain of Abl Interactor 2.
Abi2 is highly expressed in the brain and eye. It
regulates actin cytoskeletal reorganization at adherens
junctions and dendritic spines, which is important in
cell morphogenesis, migration, and cognitive function.
Mice deficient with Abi2 show defects in orientation
and migration of lens fibers, neuronal migration,
dendritic spine morphology, as well as deficits in
learning and memory. Abi proteins are adaptor proteins
serving as binding partners and substrates of Abl
tyrosine kinases. They are involved in regulating actin
cytoskeletal reorganization and play important roles in
membrane-ruffling, endocytosis, cell motility, and cell
migration. Abi proteins contain a homeobox homology
domain, a proline-rich region, and a SH3 domain. The
SH3 domain of Abi binds to a PxxP motif in Abl. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 61
Score = 28.4 bits (63), Expect = 0.52
Identities = 13/39 (33%), Positives = 21/39 (53%), Gaps = 5/39 (12%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQA 60
A++DY K+D L F G I++V +DD W++
Sbjct: 7 AIYDYTKDKEDELS-----FQEGAIIYVIKKNDDGWYEG 40
>gnl|CDD|212827 cd11894, SH3_FCHSD2_2, Second Src Homology 3 domain of FCH and
double SH3 domains protein 2. FCHSD2 has a domain
structure consisting of an N-terminal F-BAR (FES-CIP4
Homology and Bin/Amphiphysin/Rvs), two SH3, and
C-terminal proline-rich domains. It has only been
characterized in silico and its function is unknown.
SH3 domains are protein interaction domains that bind
to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 56
Score = 28.4 bits (63), Expect = 0.55
Identities = 21/63 (33%), Positives = 30/63 (47%), Gaps = 16/63 (25%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHV---TNASDDEWWQARRVLPSGDEQG-IGI 74
F +AL+DY+ DD L F G I+ + N DD +W+ G+ G IG+
Sbjct: 1 FVKALYDYEGQTDD-----ELSFPEGAIIRILNKENQDDDGFWE-------GEFNGRIGV 48
Query: 75 VPS 77
PS
Sbjct: 49 FPS 51
>gnl|CDD|212894 cd11961, SH3_Abp1_fungi_C2, Second C-terminal Src homology 3
domain of Fungal Actin-binding protein 1. Abp1 is an
adaptor protein that functions in receptor-mediated
endocytosis and vesicle trafficking. It contains an
N-terminal actin-binding module, the
actin-depolymerizing factor (ADF) homology domain, a
central proline-rich region, and a C-terminal SH3
domain (many yeast Abp1 proteins contain two C-terminal
SH3 domains). Yeast Abp1 also contains two acidic
domains that bind directly to the Arp2/3 complex, which
is required to initiate actin polymerization. The SH3
domain of yeast Abp1 binds and localizes the kinases,
Ark1p and Prk1p, which facilitate actin patch
disassembly following vesicle internalization. It also
mediates the localization to the actin patch of the
synaptojanin-like protein, Sjl2p, which plays a key
role in endocytosis. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 53
Score = 27.9 bits (62), Expect = 0.58
Identities = 13/38 (34%), Positives = 19/38 (50%), Gaps = 5/38 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
+AL+DYD +D+ L F D + DD+WW
Sbjct: 3 KALYDYDAAEDNELS-----FFENDKIINIEFVDDDWW 35
>gnl|CDD|212806 cd11873, SH3_CD2AP-like_1, First Src Homology 3 domain (SH3A) of
CD2-associated protein and similar proteins. This
subfamily is composed of the first SH3 domain (SH3A) of
CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and
similar domains. CD2AP and CIN85 are adaptor proteins
that bind to protein partners and assemble complexes
that have been implicated in T cell activation, kidney
function, and apoptosis of neuronal cells. They also
associate with endocytic proteins, actin cytoskeleton
components, and other adaptor proteins involved in
receptor tyrosine kinase (RTK) signaling. CD2AP and the
main isoform of CIN85 contain three SH3 domains, a
proline-rich region, and a C-terminal coiled-coil
domain. All of these domains enable CD2AP and CIN85 to
bind various protein partners and assemble complexes
that have been implicated in many different functions.
SH3A of both proteins bind to an atypical PXXXPR motif
at the C-terminus of Cbl and the cytoplasmic domain of
the cell adhesion protein CD2. CIN85 SH3A binds to
internal proline-rich motifs within the proline-rich
region; this intramolecular interaction serves as a
regulatory mechanism to keep CIN85 in a closed
conformation, preventing the recruitment of other
proteins. CIN85 SH3A has also been shown to bind
ubiquitin. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 53
Score = 28.0 bits (63), Expect = 0.60
Identities = 11/38 (28%), Positives = 16/38 (42%), Gaps = 5/38 (13%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQ 59
FDYD + D L GDI+ ++ WW+
Sbjct: 4 VEFDYDAEEPDELT-----LKVGDIITNVKKMEEGWWE 36
>gnl|CDD|212851 cd11918, SH3_Vinexin_3, Third (or C-terminal) Src Homology 3
domain of Vinexin, also called Sorbin and SH3 domain
containing 3 (Sorbs3). Vinexin is also called Sorbs3,
SH3P3, and SH3-containing adapter molecule 1 (SCAM-1).
It is an adaptor protein containing one sorbin homology
(SoHo) and three SH3 domains. Vinexin was first
identified as a vinculin binding protein; it is
co-localized with vinculin at cell-ECM and cell-cell
adhesion sites. There are several splice variants of
vinexin: alpha, which contains the SoHo and three SH3
domains and displays tissue-specific expression; and
beta, which contains only the three SH3 domains and is
widely expressed. Vinexin alpha stimulates the
accumulation of F-actin at focal contact sites. Vinexin
also promotes keratinocyte migration and wound healing.
The SH3 domains of vinexin have been reported to bind a
number of ligands including vinculin, WAVE2, DLG5, Abl,
and Cbl. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 58
Score = 28.0 bits (62), Expect = 0.70
Identities = 11/38 (28%), Positives = 17/38 (44%), Gaps = 5/38 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
+A++ Y P +D L GD + V DD W+
Sbjct: 5 KAVYQYRPQNEDELE-----LREGDRVDVMQQCDDGWF 37
>gnl|CDD|212941 cd12008, SH3_Src, Src homology 3 domain of Src Protein Tyrosine
Kinase. Src (or c-Src) is a cytoplasmic (or
non-receptor) PTK and is the vertebrate homolog of the
oncogenic protein (v-Src) from Rous sarcoma virus.
Together with other Src subfamily proteins, it is
involved in signaling pathways that regulate cytokine
and growth factor responses, cytoskeleton dynamics,
cell proliferation, survival, and differentiation. Src
also play a role in regulating cell adhesion, invasion,
and motility in cancer cells, and tumor vasculature,
contributing to cancer progression and metastasis.
Elevated levels of Src kinase activity have been
reported in a variety of human cancers. Several
inhibitors of Src have been developed as anti-cancer
drugs. Src is also implicated in acute inflammatory
responses and osteoclast function. Src kinases contain
an N-terminal SH4 domain with a myristoylation site,
followed by SH3 and SH2 domains, a tyr kinase domain,
and a regulatory C-terminal region containing a
conserved tyr. They are activated by
autophosphorylation at the tyr kinase domain, but are
negatively regulated by phosphorylation at the
C-terminal tyr by Csk (C-terminal Src Kinase). The SH3
domain of Src kinases contributes to substrate
recruitment by binding adaptor proteins/substrates, and
regulation of kinase activity through an intramolecular
interaction. SH3 domains are protein interaction
domains that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 56
Score = 27.8 bits (61), Expect = 0.80
Identities = 19/57 (33%), Positives = 29/57 (50%), Gaps = 11/57 (19%)
Query: 22 ALFDYDP-TKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
AL+DY+ T+ D L F G+ L + N ++ +WW A L +G G +PS
Sbjct: 4 ALYDYESRTETD------LSFKKGERLQIVNNTEGDWWLAHS-LTTGQT---GYIPS 50
>gnl|CDD|212993 cd12060, SH3_alphaPIX, Src Homology 3 domain of alpha-Pak
Interactive eXchange factor. Alpha-PIX, also called
Rho guanine nucleotide exchange factor 6 (ARHGEF6) or
Cool (Cloned out of Library)-2, activates small GTPases
by exchanging bound GDP for free GTP. It acts as a GEF
for both Cdc42 and Rac 1, and is localized in dendritic
spines where it regulates spine morphogenesis. It
controls dendritic length and spine density in the
hippocampus. Mutations in the ARHGEF6 gene cause
X-linked intellectual disability in humans. PIX
proteins contain an N-terminal SH3 domain followed by
RhoGEF (also called Dbl-homologous or DH) and
Pleckstrin Homology (PH) domains, and a C-terminal
leucine-zipper domain for dimerization. The SH3 domain
of PIX binds to an atypical PxxxPR motif in
p21-activated kinases (PAKs) with high affinity. The
binding of PAKs to PIX facilitate the localization of
PAKs to focal complexes and also localizes PAKs to PIX
targets Cdc43 and Rac, leading to the activation of
PAKs. SH3 domains are protein interaction domains that
bind to proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 58
Score = 27.7 bits (61), Expect = 0.87
Identities = 12/40 (30%), Positives = 20/40 (50%), Gaps = 5/40 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQA 60
+A F++ T +D L GDI++VT + WW+
Sbjct: 5 KARFNFKQTNEDELS-----VCKGDIIYVTRVEEGGWWEG 39
>gnl|CDD|212919 cd11986, SH3_Stac3_1, First C-terminal Src homology 3 domain of
SH3 and cysteine-rich domain-containing protein 3
(Stac3). Stac proteins are putative adaptor proteins
that contain a cysteine-rich C1 domain and one or two
SH3 domains at the C-terminus. There are three
mammalian members (Stac1, Stac2, and Stac3) of this
family. Stac1 and Stac3 contain two SH3 domains while
Stac2 contains a single SH3 domain at the C-terminus.
Stac1 and Stac2 have been found to be expressed
differently in mature dorsal root ganglia (DRG)
neurons. Stac1 is mainly expressed in peptidergic
neurons while Stac2 is found in a subset of
nonpeptidergic and all trkB+ neurons. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 27.6 bits (61), Expect = 1.00
Identities = 12/32 (37%), Positives = 19/32 (59%), Gaps = 6/32 (18%)
Query: 30 KDDGLPSRGLPFHYGDILHVTNASDDEWWQAR 61
KDD L FH G+ + V + S++EWW+ +
Sbjct: 13 KDD------LDFHPGERITVIDDSNEEWWRGK 38
>gnl|CDD|178782 PLN03244, PLN03244, alpha-amylase; Provisional.
Length = 872
Score = 30.0 bits (67), Expect = 1.1
Identities = 18/39 (46%), Positives = 26/39 (66%), Gaps = 6/39 (15%)
Query: 15 HLFSFSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNAS 53
HLFSF + L D D +++G+ SRGLP +I HV +A+
Sbjct: 747 HLFSFDKDLMDLD--ENEGILSRGLP----NIHHVKDAA 779
>gnl|CDD|212945 cd12012, SH3_RIM-BP_2, Second Src homology 3 domain of
Rab3-interacting molecules (RIMs) binding proteins.
RIMs binding proteins (RBPs, RIM-BPs) associate with
calcium channels present in photoreceptors, neurons,
and hair cells; they interact simultaneously with
specific calcium channel subunits, and active zone
proteins, RIM1 and RIM2. RIMs are part of the matrix at
the presynaptic active zone and are associated with
synaptic vesicles through their interaction with the
small GTPase Rab3. RIM-BPs play a role in regulating
synaptic transmission by serving as adaptors and
linking calcium channels with the synaptic vesicle
release machinery. RIM-BPs contain three SH3 domains
and two to three fibronectin III repeats. Invertebrates
contain one, while vertebrates contain at least two
RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called
peripheral-type benzodiazapine receptor associated
protein 1 (PRAX-1). Mammals contain a third protein,
RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly
expressed in the brain where they display overlapping
but distinct expression patterns, while RIM-BP3 is
almost exclusively expressed in the testis and is
essential in spermiogenesis. The SH3 domains of RIM-BPs
bind to the PxxP motifs of RIM1, RIM2, and L-type
(alpha1D) and N-type (alpha1B) calcium channel
subunits. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 62
Score = 27.6 bits (62), Expect = 1.1
Identities = 13/32 (40%), Positives = 15/32 (46%), Gaps = 5/32 (15%)
Query: 22 ALFDYDPT----KDDGLPSRGLPFHYGDILHV 49
ALFDYDP D LPF G ++ V
Sbjct: 4 ALFDYDPLTMSPNPDAA-EEELPFKEGQLIKV 34
>gnl|CDD|212888 cd11955, SH3_srGAP1-3, Src homology 3 domain of Slit-Robo GTPase
Activating Proteins 1, 2, and 3. srGAP1, also called
Rho GTPase-Activating Protein 13 (ARHGAP13), is a
Cdc42- and RhoA-specific GAP and is expressed later in
the development of central nervous system tissues.
srGAP2 is expressed in zones of neuronal
differentiation. It plays a role in the regeneration of
neurons and axons. srGAP3, also called MEGAP (MEntal
disorder associated GTPase-Activating Protein), is a
Rho GAP with activity towards Rac1 and Cdc42. It
impacts cell migration by regulating actin and
microtubule cytoskeletal dynamics. The association
between srGAP3 haploinsufficiency and mental
retardation is under debate. srGAPs are Rho GAPs that
interact with Robo1, the transmembrane receptor of Slit
proteins. Slit proteins are secreted proteins that
control axon guidance and the migration of neurons and
leukocytes. srGAPs contain an N-terminal F-BAR domain,
a Rho GAP domain, and a C-terminal SH3 domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 53
Score = 27.2 bits (60), Expect = 1.2
Identities = 18/57 (31%), Positives = 28/57 (49%), Gaps = 11/57 (19%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPSK 78
A FDY G +R L F G L + + + D+WW+ R +G + G+VP +
Sbjct: 4 AKFDYV-----GRSARELSFKKGASLLLYHRASDDWWEGRH---NGID---GLVPHQ 49
>gnl|CDD|212863 cd11930, SH3_SH3RF1_2, Second Src Homology 3 domain of SH3 domain
containing ring finger protein 1, an E3
ubiquitin-protein ligase. SH3RF1 is also called POSH
(Plenty of SH3s) or SH3MD2 (SH3 multiple domains
protein 2). It is a scaffold protein that acts as an E3
ubiquitin-protein ligase. It plays a role in calcium
homeostasis through the control of the ubiquitin domain
protein Herp. It may also have a role in regulating
death receptor mediated and JNK mediated apoptosis.
SH3RF1 also enhances the ubiquitination of ROMK1
potassium channel resulting in its increased
endocytosis. It contains an N-terminal RING finger
domain and four SH3 domains. This model represents the
second SH3 domain, located C-terminal of the first SH3
domain at the N-terminal half, of SH3RF1. SH3 domains
are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 55
Score = 27.3 bits (60), Expect = 1.2
Identities = 22/56 (39%), Positives = 29/56 (51%), Gaps = 7/56 (12%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVP 76
+AL+D++ KD LPF DIL V D+ W A +L GD+ IGI P
Sbjct: 3 KALYDFE-VKDKEADKDCLPFAKDDILTVIRRVDENW--AEGML--GDK--IGIFP 51
>gnl|CDD|212777 cd11843, SH3_PACSIN, Src homology 3 domain of Protein kinase C
and Casein kinase Substrate in Neurons (PACSIN)
proteins. PACSINs, also called Synaptic
dynamin-associated proteins (Syndapins), act as
regulators of cytoskeletal and membrane dynamics. They
bind both dynamin and Wiskott-Aldrich syndrome protein
(WASP), and may provide direct links between the actin
cytoskeletal machinery through WASP and
dynamin-dependent endocytosis. Vetebrates harbor three
isoforms with distinct expression patterns and specific
functions. PACSINs contain an N-terminal F-BAR domain
and a C-terminal SH3 domain. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 53
Score = 27.0 bits (60), Expect = 1.4
Identities = 14/38 (36%), Positives = 19/38 (50%), Gaps = 5/38 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
RAL+DY+ + D L F GDIL D++ W
Sbjct: 3 RALYDYEGQESD-----ELSFKAGDILTKLEEEDEQGW 35
>gnl|CDD|215519 PLN02960, PLN02960, alpha-amylase.
Length = 897
Score = 29.4 bits (66), Expect = 1.5
Identities = 17/39 (43%), Positives = 21/39 (53%), Gaps = 6/39 (15%)
Query: 15 HLFSFSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNAS 53
HLFSF +AL D + SRGLP +I HV + S
Sbjct: 772 HLFSFDKALMALDEKY--LILSRGLP----NIHHVNDTS 804
>gnl|CDD|212918 cd11985, SH3_Stac2_C, C-terminal Src homology 3 domain of SH3 and
cysteine-rich domain-containing protein 2 (Stac2).
Stac proteins are putative adaptor proteins that
contain a cysteine-rich C1 domain and one or two SH3
domains at the C-terminus. There are three mammalian
members (Stac1, Stac2, and Stac3) of this family. Stac2
contains a single SH3 domain at the C-terminus unlike
Stac1 and Stac3, which contain two C-terminal SH3
domains. Stac1 and Stac2 have been found to be
expressed differently in mature dorsal root ganglia
(DRG) neurons. Stac1 is mainly expressed in peptidergic
neurons while Stac2 is found in a subset of
nonpeptidergic and all trkB+ neurons. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 26.8 bits (59), Expect = 1.7
Identities = 16/56 (28%), Positives = 30/56 (53%), Gaps = 11/56 (19%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQGIGIVPS 77
AL+ + P +++ LP GD + V + S+++WW+ + SGD +G P+
Sbjct: 4 ALYKFLPQENNDLP-----LQPGDRVMVVDDSNEDWWKGK----SGDR--VGFFPA 48
>gnl|CDD|212987 cd12054, SH3_CD2AP_2, Second Src Homology 3 domain (SH3B) of
CD2-associated protein. CD2AP, also called CMS (Cas
ligand with Multiple SH3 domains) or METS1
(Mesenchyme-to-Epithelium Transition protein with SH3
domains), is a cytosolic adaptor protein that plays a
role in regulating the cytoskeleton. It is critical in
cell-to-cell union necessary for kidney function. It
also stabilizes the contact between a T cell and
antigen-presenting cells. It is primarily expressed in
podocytes at the cytoplasmic face of the slit diaphragm
and serves as a linker anchoring podocin and nephrin to
the actin cytoskeleton. CD2AP contains three SH3
domains, a proline-rich region, and a C-terminal
coiled-coil domain. All of these domains enable CD2AP
to bind various protein partners and assemble complexes
that have been implicated in many different functions.
This alignment model represents the second SH3 domain
(SH3B) of CD2AP. SH3B binds to c-Cbl in a site
(TPSSRPLR is the core binding motif) distinct from the
c-Cbl/SH3A binding site. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 55
Score = 26.5 bits (58), Expect = 2.0
Identities = 17/58 (29%), Positives = 25/58 (43%), Gaps = 13/58 (22%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIVPS 77
+ LF+Y P +D L GDI+ + ++ WW SG G G+ PS
Sbjct: 4 KVLFEYVPQNEDELE-----LKVGDIIDINEEVEEGWW-------SGTLNGKSGLFPS 49
>gnl|CDD|212717 cd11783, SH3_SH3RF_3, Third Src Homology 3 domain of SH3 domain
containing ring finger 1 (SH3RF1), SH3RF3, and similar
domains. SH3RF1 (or POSH) and SH3RF3 (or POSH2) are
scaffold proteins that function as E3 ubiquitin-protein
ligases. They contain an N-terminal RING finger domain
and four SH3 domains. This model represents the third
SH3 domain, located in the middle of SH3RF1 and SH3RF3,
and similar domains. SH3RF1 plays a role in calcium
homeostasis through the control of the ubiquitin domain
protein Herp. It may also have a role in regulating
death receptor mediated and JNK mediated apoptosis.
SH3RF3 interacts with p21-activated kinase 2 (PAK2) and
GTP-loaded Rac1. It may play a role in regulating JNK
mediated apoptosis in certain conditions. SH3 domains
are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 55
Score = 26.6 bits (59), Expect = 2.2
Identities = 12/36 (33%), Positives = 15/36 (41%), Gaps = 5/36 (13%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEW 57
AL+ Y P K D L G++ VT D W
Sbjct: 4 ALYPYKPQKPD-----ELELRKGEMYTVTEKCQDGW 34
>gnl|CDD|212747 cd11813, SH3_SGSM3, Src Homology 3 domain of Small G protein
Signaling Modulator 3. SGSM3 is also called
Merlin-associated protein (MAP), RUN and SH3
domain-containing protein (RUSC3), RUN and TBC1
domain-containing protein 3 (RUTBC3), Rab
GTPase-activating protein 5 (RabGAP5), or Rab GAP-like
protein (RabGAPLP). It is expressed ubiquitously and
functions as a regulator of small G protein RAP- and
RAB-mediated neuronal signaling. It is involved in
modulating NGF-mediated neurite outgrowth and
differentiation. It also interacts with the tumor
suppressor merlin and may play a role in the
merlin-associated suppression of cell growth. SGSM3
contains TBC, SH3, and RUN domains. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 26.3 bits (58), Expect = 2.3
Identities = 11/39 (28%), Positives = 19/39 (48%), Gaps = 5/39 (12%)
Query: 20 SRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
++AL D++ DD L F DI+ + + D+ W
Sbjct: 2 AKALLDFERHDDDELG-----FRKNDIITIISQKDEHCW 35
>gnl|CDD|212879 cd11946, SH3_GRB2_N, N-terminal Src homology 3 domain of Growth
factor receptor-bound protein 2. GRB2 is a critical
signaling molecule that regulates the Ras pathway by
linking tyrosine kinases to the Ras guanine nucleotide
releasing protein Sos (son of sevenless), which
converts Ras to the active GTP-bound state. It is
ubiquitously expressed in all tissues throughout
development and is important in cell cycle progression,
motility, morphogenesis, and angiogenesis. In
lymphocytes, GRB2 is associated with antigen receptor
signaling components. GRB2 contains an N-terminal SH3
domain, a central SH2 domain, and a C-terminal SH3
domain. Its N-terminal SH3 domain binds to Sos and
Sos-derived proline-rich peptides. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 56
Score = 26.1 bits (57), Expect = 2.8
Identities = 16/40 (40%), Positives = 20/40 (50%), Gaps = 6/40 (15%)
Query: 22 ALFDYDPTKDDGLPSRGLPFHYGDILHVTN-ASDDEWWQA 60
A +D+ T DD L F GDIL V N D W++A
Sbjct: 5 AKYDFKATADDELS-----FKRGDILKVLNEECDQNWYKA 39
>gnl|CDD|212794 cd11860, SH3_DLG5, Src homology 3 domain of Disks Large homolog
5. DLG5 is a multifunctional scaffold protein that is
located at sites of cell-cell contact and is involved
in the maintenance of cell shape and polarity.
Mutations in the DLG5 gene are associated with Crohn's
disease (CD) and inflammatory bowel disease (IBD). DLG5
is a member of the MAGUK (membrane-associated guanylate
kinase) protein family, which is characterized by the
presence of a core of three domains: PDZ, SH3, and
guanylate kinase (GuK). The GuK domain in MAGUK
proteins is enzymatically inactive; instead, the domain
mediates protein-protein interactions and associates
intramolecularly with the SH3 domain. DLG5 contains 4
PDZ domains as well as an N-terminal domain of unknown
function. SH3 domains are protein interaction domains
that bind to proline-rich ligands with moderate
affinity and selectivity, preferentially to PxxP
motifs. They play versatile and diverse roles in the
cell including the regulation of enzymes, changing the
subcellular localization of signaling pathway
components, and mediating the formation of multiprotein
complex assemblies.
Length = 63
Score = 26.1 bits (58), Expect = 3.2
Identities = 23/67 (34%), Positives = 32/67 (47%), Gaps = 8/67 (11%)
Query: 19 FSRALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDE---WWQARRVLPSGDEQGIGIV 75
+ RALFD +D L F DIL+V N + W+A V G ++ GI+
Sbjct: 1 YVRALFDRSAENEDELS-----FKKDDILYVDNTMFNGVFGQWRAWLVDEEGRKRKCGII 55
Query: 76 PSKKRWE 82
PSK + E
Sbjct: 56 PSKYKVE 62
>gnl|CDD|212728 cd11794, SH3_DNMBP_N1, First N-terminal Src homology 3 domain of
Dynamin Binding Protein, also called Tuba. DNMBP or
Tuba is a cdc42-specific guanine nucleotide exchange
factor (GEF) that contains four N-terminal SH3 domains,
a central RhoGEF [or Dbl homology (DH)] domain followed
by a Bin/Amphiphysin/Rvs (BAR) domain, and two
C-terminal SH3 domains. It provides a functional link
between dynamin and key regulatory proteins of the
actin cytoskeleton. It plays an important role in
regulating cell junction configuration. The four
N-terminal SH3 domains of DNMBP binds the GTPase
dynamin, which plays an important role in the fission
of endocytic vesicles. SH3 domains are protein
interaction domains that bind to proline-rich ligands
with moderate affinity and selectivity, preferentially
to PxxP motifs. They play versatile and diverse roles
in the cell including the regulation of enzymes,
changing the subcellular localization of signaling
pathway components, and mediating the formation of
multiprotein complex assemblies.
Length = 51
Score = 25.9 bits (57), Expect = 3.5
Identities = 13/37 (35%), Positives = 19/37 (51%), Gaps = 5/37 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEW 57
RA+FD+ P+ S LP GD++ V D+ W
Sbjct: 3 RAIFDFCPSV-----SEELPLFAGDVIEVLKVVDEFW 34
>gnl|CDD|212898 cd11965, SH3_ASAP1, Src homology 3 domain of ArfGAP with SH3
domain, ankyrin repeat and PH domain containing protein
1. ASAP1 is also called DDEF1 (Development and
Differentiation Enhancing Factor 1), AMAP1, centaurin
beta-4, or PAG2. an Arf GTPase activating protein (GAP)
with activity towards Arf1 and Arf5 but not Arf6.
However, it has been shown to bind GTP-Arf6 stably
without GAP activity. It has been implicated in cell
growth, migration, and survival, as well as in tumor
invasion and malignancy. It binds paxillin and
cortactin, two components of invadopodia which are
essential for tumor invasiveness. It also binds focal
adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL.
ASAP1 contains an N-terminal BAR domain, followed by a
Pleckstrin homology (PH) domain, an Arf GAP domain,
ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3
domains are protein interaction domains that bind to
proline-rich ligands with moderate affinity and
selectivity, preferentially to PxxP motifs. They play
versatile and diverse roles in the cell including the
regulation of enzymes, changing the subcellular
localization of signaling pathway components, and
mediating the formation of multiprotein complex
assemblies.
Length = 57
Score = 26.1 bits (57), Expect = 3.6
Identities = 12/38 (31%), Positives = 18/38 (47%), Gaps = 5/38 (13%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWW 58
+ ++D DD L F G+++ VT D EWW
Sbjct: 3 KTIYDCQADNDDELT-----FVEGEVIIVTGEEDQEWW 35
>gnl|CDD|212715 cd11781, SH3_Sorbs_1, First Src Homology 3 domain of Sorbin and
SH3 domain containing (Sorbs) proteins and similar
domains. This family, also called the vinexin family,
is composed predominantly of adaptor proteins
containing one sorbin homology (SoHo) and three SH3
domains. Members include the first SH3 domains of
Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or
Sorbs3), and similar domains. They are involved in the
regulation of cytoskeletal organization, cell adhesion,
and growth factor signaling. Members of this family
bind multiple partners including signaling molecules
like c-Abl, c-Arg, Sos, and c-Cbl, as well as
cytoskeletal molecules such as vinculin and afadin.
They may have overlapping functions. SH3 domains are
protein interaction domains that bind to proline-rich
ligands with moderate affinity and selectivity,
preferentially to PxxP motifs. They play versatile and
diverse roles in the cell including the regulation of
enzymes, changing the subcellular localization of
signaling pathway components, and mediating the
formation of multiprotein complex assemblies.
Length = 53
Score = 25.0 bits (55), Expect = 6.2
Identities = 14/58 (24%), Positives = 26/58 (44%), Gaps = 13/58 (22%)
Query: 21 RALFDYDPTKDDGLPSRGLPFHYGDILHVTNASDDEWWQARRVLPSGDEQG-IGIVPS 77
RAL+ + ++ L GDI+++ D W++ G+ G +GI P+
Sbjct: 3 RALYPFKAQS-----AKELSLKKGDIIYIRRQIDKNWYE-------GEHNGRVGIFPA 48
>gnl|CDD|237131 PRK12536, PRK12536, RNA polymerase sigma factor; Provisional.
Length = 181
Score = 26.6 bits (59), Expect = 8.4
Identities = 27/85 (31%), Positives = 36/85 (42%), Gaps = 23/85 (27%)
Query: 52 ASDDEWWQARRVLPSGDEQGIGIVPSKKRWERKQRARDRTVKFQGHVPVLLEKVSITQFS 111
SDDE +ARR L EQ +P + QR VK +G S
Sbjct: 111 TSDDEAAEARRDLGKLLEQ----LPDR------QRLPIVHVKLEG-------------LS 147
Query: 112 MIELNTIFKLIEKSVALGLTRGLKA 136
+ E + L E +V +G+ RGLKA
Sbjct: 148 VAETAQLTGLSESAVKVGIHRGLKA 172
Database: CDD.v3.10
Posted date: Mar 20, 2013 7:55 AM
Number of letters in database: 10,937,602
Number of sequences in database: 44,354
Lambda K H
0.323 0.139 0.412
Gapped
Lambda K H
0.267 0.0813 0.140
Matrix: BLOSUM62
Gap Penalties: Existence: 11, Extension: 1
Number of Sequences: 44354
Number of Hits to DB: 10,779,070
Number of extensions: 1018020
Number of successful extensions: 977
Number of sequences better than 10.0: 1
Number of HSP's gapped: 941
Number of HSP's successfully gapped: 135
Length of query: 207
Length of database: 10,937,602
Length adjustment: 92
Effective length of query: 115
Effective length of database: 6,857,034
Effective search space: 788558910
Effective search space used: 788558910
Neighboring words threshold: 11
Window for multiple hits: 40
X1: 16 ( 7.5 bits)
X2: 38 (14.6 bits)
X3: 64 (24.7 bits)
S1: 41 (22.0 bits)
S2: 57 (25.6 bits)