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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

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Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

alpha bundlesalpha-helix bundles with mainly parallel helices

alpha superhelicesrepeating alpha-helix hairpins form a superhelix

alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain

alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix

beta barrelssingle beta-sheet folded upon itself to form a barrel

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: SH3
H: SH3
T: SH3
F: SH3_1

PF00018 CL0010

Representatives:

e1zuuA1[A:2-57] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

BZZ1 protein ; ligands: MG,UNX ; X-RAY DIFFRACTION 0.97Å

e2iimA1[A:58-119] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE LCK ; ligands: CA,PG4,ZN ; X-RAY DIFFRACTION 1.0Å

e1jo8A1[A:1-58] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ACTIN BINDING PROTEIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.3Å

e1ootA1[A:1-58] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL 40.4 KDA PROTEIN IN PES4-HIS2 INTERGENIC REGION ; ligands: CL ; X-RAY DIFFRACTION 1.39Å

e1u06A1[A:7-61] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; ligands: AZI ; X-RAY DIFFRACTION 1.49Å

e1ckaA1[A:134-190] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C-CRK N-TERMINAL SH3 DOMAIN ; X-RAY DIFFRACTION 1.5Å

e1zukA1[A:3-67] Image Pymol Jmol Links: PDB, SCOP, CATH

Myosin tail region-interacting protein MTI1 ; ligands: CL,MG ; X-RAY DIFFRACTION 1.86Å

e1zukB1[B:3-67] Image Pymol Jmol Links: PDB, SCOP, CATH

Myosin tail region-interacting protein MTI1 ; ligands: CL ; X-RAY DIFFRACTION 1.86Å

e2o88A1[A:64-121] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.75Å

e2jm8A1[A:1-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; SOLUTION NMR

e2jm9A1[A:1-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; SOLUTION NMR

e2jmaA1[A:1-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; SOLUTION NMR

e2vvkA1[A:1-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GROWTH FACTOR RECEPTOR-BOUND PROTEIN 2 ; ligands: GOL ; X-RAY DIFFRACTION 1.6Å

e2hdaA1[A:92-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE YES ; ligands: SO4 ; X-RAY DIFFRACTION 1.9Å

e2o88B1[B:64-119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.75Å

e2w0zA1[A:-1-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GROWTH FACTOR RECEPTOR-BOUND PROTEIN 2 ; X-RAY DIFFRACTION 1.7Å

e2w10B1[B:1-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GRB2-RELATED ADAPTOR PROTEIN 2 ; ligands: PO4 ; X-RAY DIFFRACTION 1.9Å

e3fj5B1[B:84-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Src ; ligands: ACT,GOL,PG4,PGE,SO4 ; X-RAY DIFFRACTION 1.600Å

e2oawA1[A:1006-1070] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; ligands: CL ; X-RAY DIFFRACTION 1.90Å

e2oawB1[B:2006-2070] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; ligands: CL ; X-RAY DIFFRACTION 1.90Å

e2oawC1[C:3006-3070] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; ligands: CL ; X-RAY DIFFRACTION 1.90Å

e2oawD1[D:4006-4070] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; ligands: CL ; X-RAY DIFFRACTION 1.90Å

e2rotA1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; SOLUTION NMR

e2drmA1[A:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH

Acanthamoeba Myosin IB ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.290Å

e2drmB1[B:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH

Acanthamoeba Myosin IB ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.290Å

e2drmC1[C:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH

Acanthamoeba Myosin IB ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.290Å

e2drmD1[D:2-59] Image Pymol Jmol Links: PDB, SCOP, CATH

Acanthamoeba Myosin IB ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.290Å

e3eg1A1[A:64-121] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.850Å

e3eg1B1[B:64-119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.850Å

e3eg2A1[A:59-121] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: GOL ; X-RAY DIFFRACTION 1.80Å

e3eg3A1[A:59-121] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: GOL ; X-RAY DIFFRACTION 1.350Å

e3eguA1[A:63-119] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.15Å

e3h0hA1[A:80-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Fyn ; ligands: PG4 ; X-RAY DIFFRACTION 1.76Å

e3h0iA1[A:84-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Fyn ; X-RAY DIFFRACTION 2.2Å

e3h0iB1[B:84-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Fyn ; X-RAY DIFFRACTION 2.2Å

e3m0rA1[A:5-62] Image Pymol Jmol Links: PDB, SCOP, CATH

Spectrin alpha chain, brain ; ligands: SO4 ; X-RAY DIFFRACTION 1.10Å

e3m0uA1[A:5-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain ; ligands: FMT ; X-RAY DIFFRACTION 1.100Å

e3m0qA1[A:7-62] Image Pymol Jmol Links: PDB, SCOP, CATH

Spectrin alpha chain, brain ; ligands: SO4 ; X-RAY DIFFRACTION 1.746Å

e3m0sA1[A:6-62] Image Pymol Jmol Links: PDB, SCOP, CATH

Spectrin alpha chain, brain ; ligands: SO4 ; X-RAY DIFFRACTION 1.598Å

e3m0tA1[A:6-61] Image Pymol Jmol Links: PDB, SCOP, CATH

Spectrin alpha chain, brain ; ligands: SO4 ; X-RAY DIFFRACTION 1.70Å

e3thkB1[B:5-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

SPECTRIN ALPHA CHAIN, BRAIN ; ligands: BME,SO4 ; X-RAY DIFFRACTION 1.7Å

e3rbbD1[D:80-137] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYROSINE-PROTEIN KINASE HCK ; X-RAY DIFFRACTION 2.35Å

e3reaB1[B:79-138] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; X-RAY DIFFRACTION 2.0Å

e3reaD1[D:78-137] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; X-RAY DIFFRACTION 2.0Å

e3rebD1[D:79-138] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; X-RAY DIFFRACTION 3.45Å

e3qwxX1[X:115-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cell death abnormality protein 2 ; X-RAY DIFFRACTION 2.01Å

e3qwyB1[B:115-174] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cell death abnormality protein 2 ; X-RAY DIFFRACTION 2.50Å

e4esrB1[B:1048-1112] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Jouberin ; ligands: PEG ; X-RAY DIFFRACTION 1.530Å

e1bu1B1[B:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (HEMOPOIETIC CELL KINASE) ; X-RAY DIFFRACTION 2.6Å

e1bu1C1[C:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (HEMOPOIETIC CELL KINASE) ; X-RAY DIFFRACTION 2.6Å

e1bu1E1[E:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (HEMOPOIETIC CELL KINASE) ; X-RAY DIFFRACTION 2.6Å

e1bu1F1[F:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (HEMOPOIETIC CELL KINASE) ; X-RAY DIFFRACTION 2.6Å

e1bu1A1[A:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (HEMOPOIETIC CELL KINASE) ; X-RAY DIFFRACTION 2.6Å

e1bu1D1[D:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (HEMOPOIETIC CELL KINASE) ; X-RAY DIFFRACTION 2.6Å

e2kxdA1[A:1-73] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

11-mer peptide,Spectrin alpha chain, non-erythrocytic 1,Spectrin alpha chain, non-erythrocytic 1 ; SOLUTION NMR

e2l0aA1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH

SIGNAL TRANSDUCING ADAPTER MOLECULE 1 ; SOLUTION NMR

e2lqnA2[A:120-197] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crk-like protein ; SOLUTION NMR

e4glmA1[A:245-302] Image Pymol Jmol Links: PDB, SCOP, CATH

DYNAMIN-BINDING PROTEIN ; ligands: UNX ; X-RAY DIFFRACTION 1.9Å

e4afqC1[C:-1-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; ligands: CPS ; X-RAY DIFFRACTION 1.51Å

e4afzC1[C:-1-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; ligands: TAR ; X-RAY DIFFRACTION 2.25Å

e4hxjA1[A:82-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE SRC ; X-RAY DIFFRACTION 2.0Å

e3ua6A1[A:82-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYROSINE-PROTEIN KINASE FYN ; ligands: FMT,GOL,NA ; X-RAY DIFFRACTION 1.85Å

e4d8dC1[C:84-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase Fyn ; ligands: GOL ; X-RAY DIFFRACTION 2.52Å

e2eyzA2[A:125-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

v-crk sarcoma virus CT10 oncogene homolog isoform a ; SOLUTION NMR

e2jmcA1[A:1-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Spectrin alpha chain, brain and P41 peptide chimera ; SOLUTION NMR

e2dl8A1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH

SLIT-ROBO Rho GTPase-activating protein 2 ; SOLUTION NMR

e1x2qA1[A:1-88] Image Pymol Jmol Links: PDB, SCOP, CATH

Signal transducing adapter molecule 2 ; SOLUTION NMR

e4eikA1[A:84-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase Fyn ; ligands: NA ; X-RAY DIFFRACTION 1.600Å

e4f16A1[A:6-62] Image Pymol Jmol Links: PDB, SCOP, CATH

Spectrin alpha chain, brain ; X-RAY DIFFRACTION 1.93Å

e3vryB1[B:85-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYROSINE-PROTEIN KINASE HCK ; ligands: CL ; X-RAY DIFFRACTION 2.48Å

e4hvwA1[A:81-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE SRC ; ligands: ACE ; X-RAY DIFFRACTION 0.98Å

e1z9qA1[A:1-66] Image Pymol Jmol Links: PDB, SCOP, CATH

Neutrophil cytosol factor 4 ; SOLUTION NMR

e2yupA1[A:1-90] Image Pymol Jmol Links: PDB, SCOP, CATH

Vinexin ; SOLUTION NMR

e2lj3A1[A:1-90] Image Pymol Jmol Links: PDB, SCOP, CATH

SPECTRIN ALPHA CHAIN, BRAIN ; SOLUTION NMR

e2l3sA1[A:135-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AUTOINHIBITED CRK PROTEIN ; SOLUTION NMR

e2lqwA1[A:120-197] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRK-LIKE PROTEIN ; SOLUTION NMR

e4ag2C1[C:-3-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; ligands: LMR,MES,NA ; X-RAY DIFFRACTION 1.8Å

e4afzD1[D:-3-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; X-RAY DIFFRACTION 2.25Å

e4afuD1[D:-3-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; X-RAY DIFFRACTION 1.82Å

e4ag1C1[C:-3-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; X-RAY DIFFRACTION 1.4Å

e4ag2D1[D:-3-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; ligands: LMR,NA ; X-RAY DIFFRACTION 1.8Å

e4afqD1[D:-3-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; ligands: FLC ; X-RAY DIFFRACTION 1.51Å

e4afsC1[C:-3-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; ligands: PO4 ; X-RAY DIFFRACTION 1.9Å

e4afuC1[C:-3-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER ; X-RAY DIFFRACTION 1.82Å

e4hxjB1[B:82-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE SRC ; X-RAY DIFFRACTION 2.0Å

e3zl7C1[C:6-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FYNOMER 2B-H11 ; X-RAY DIFFRACTION 3.2Å

e4hvuA1[A:81-137] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE SRC ; ligands: ACE,SO4 ; X-RAY DIFFRACTION 0.98Å

e4hvvA1[A:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE SRC ; ligands: SO4 ; X-RAY DIFFRACTION 1.1Å

e1uhfA1[A:1-69] Image Pymol Jmol Links: PDB, SCOP, CATH

INTERSECTIN 2 ; SOLUTION NMR

e1ue9A1[A:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH

Intersectin 2 ; SOLUTION NMR

e2dnuA1[A:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH

SH3 multiple domains 1 ; SOLUTION NMR

e2ekhA1[A:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH

SH3 and PX domain-containing protein 2A ; SOLUTION NMR

e4igzA1[A:864-939] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: UNX

e2yuoA1[A:1-78] Image Pymol Jmol Links: PDB, SCOP, CATH

RUN and TBC1 domain containing 3 ; SOLUTION NMR

e2kbtA1[A:780-848] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene vav,Immunoglobulin G-binding protein G ; SOLUTION NMR

e2ct4A1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH

Cdc42-interacting protein 4 ; SOLUTION NMR

e1hsqA1[A:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHOSPHOLIPASE C-GAMMA (SH3 DOMAIN) ; SOLUTION NMR

e1x6gA1[A:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH

Megakaryocyte-associated tyrosine-protein kinase ; SOLUTION NMR

e2dmoA1[A:1-68] Image Pymol Jmol Links: PDB, SCOP, CATH

Neutrophil cytosol factor 2 ; SOLUTION NMR

e2enmA1[A:1-77] Image Pymol Jmol Links: PDB, SCOP, CATH

Sorting nexin-9 ; SOLUTION NMR

e2eqiA1[A:1-69] Image Pymol Jmol Links: PDB, SCOP, CATH

Phospholipase C, gamma 2 ; SOLUTION NMR

e1wx6A1[A:1-91] Image Pymol Jmol Links: PDB, SCOP, CATH

Cytoplasmic protein NCK2 ; SOLUTION NMR

e2yt6A1[A:26-109] Image Pymol Jmol Links: PDB, SCOP, CATH

Adult male urinary bladder cDNA, RIKEN full-length enriched library, clone:9530076O17 product:Yamaguchi sarcoma viral (v-yes) oncogene homolog ; SOLUTION NMR

e1k9aB1[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBOXYL-TERMINAL SRC KINASE ; X-RAY DIFFRACTION 2.5Å

e1k9aC1[C:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBOXYL-TERMINAL SRC KINASE ; X-RAY DIFFRACTION 2.5Å

e1k9aD1[D:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBOXYL-TERMINAL SRC KINASE ; X-RAY DIFFRACTION 2.5Å

e1k9aE1[E:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBOXYL-TERMINAL SRC KINASE ; X-RAY DIFFRACTION 2.5Å

e1k9aF1[F:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBOXYL-TERMINAL SRC KINASE ; X-RAY DIFFRACTION 2.5Å

e2eywA1[A:121-198] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

v-crk sarcoma virus CT10 oncogene homolog isoform a ; SOLUTION NMR

e1gbrA1[A:-8-65] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GROWTH FACTOR RECEPTOR-BOUND PROTEIN 2 ; SOLUTION NMR

e2lz6B1[B:5-64] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CD2-associated protein ; SOLUTION NMR

e4m4zA2[A:36-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SRC-LIKE-ADAPTER 2 ; X-RAY DIFFRACTION 2.1Å

e4j9fA1[A:59-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.09Å

e4j9fE1[E:62-121] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.09Å

e4j9fC1[C:64-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.09Å

e4j9hB1[B:64-119] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.7Å

e4j9hC1[C:64-119] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.7Å

e4j9hD1[D:64-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.7Å

e4j9hF1[F:64-119] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.7Å

e4j9iA1[A:65-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 2.2Å

e4j9iC1[C:65-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 2.2Å

e4j9iE1[E:64-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: GOL ; X-RAY DIFFRACTION 2.2Å

e4j9dA1[A:65-120] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ABL1 ; X-RAY DIFFRACTION 1.500Å

e4j9dC1[C:65-120] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ABL1 ; X-RAY DIFFRACTION 1.500Å

e4j9dE1[E:62-120] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.500Å

e4j9eA1[A:65-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.4Å

e4j9eC1[C:65-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.4Å

e4j9eE1[E:64-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.4Å

e4j9bA1[A:63-120] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ABL1 ; ligands: PEG ; X-RAY DIFFRACTION 1.702Å

e4j9cA1[A:63-120] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ABL1 ; ligands: PEG,PGE ; X-RAY DIFFRACTION 1.051Å

e4j9gA1[A:63-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; X-RAY DIFFRACTION 1.8Å

e4j9gC1[C:63-119] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: GOL ; X-RAY DIFFRACTION 1.8Å

e4j9gE1[E:63-119] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.8Å

e4j9hA1[A:62-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.7Å

e4j9hE1[E:62-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: SO4 ; X-RAY DIFFRACTION 1.7Å

e4lueA3[A:85-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; ligands: CL ; X-RAY DIFFRACTION 3.040Å

e4jjbA1[A:64-120] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: PEG,SO4 ; X-RAY DIFFRACTION 1.65Å

e4jjcA1[A:64-121] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: PEG ; X-RAY DIFFRACTION 1.6Å

e4jjdA1[A:59-121] Image Pymol Jmol Links: PDB, SCOP, CATH

TYROSINE-PROTEIN KINASE ABL1 ; ligands: NA,PEG ; X-RAY DIFFRACTION 1.6Å

e4orzA1[A:81-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYROSINE-PROTEIN KINASE HCK ; X-RAY DIFFRACTION 2.0Å

e2dvjA6[A:122-190] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

V-crk sarcoma virus CT10 oncogene homolog, isoform a ; SOLUTION NMR

e2eyyA4[A:126-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

v-crk sarcoma virus CT10 oncogene homolog isoform a ; SOLUTION NMR

e1m8mA2[A:7-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SPECTRIN ALPHA CHAIN, BRAIN ; SOLID-STATE NMR

e3vs1A6[A:85-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYROSINE-PROTEIN KINASE HCK ; ligands: CL ; X-RAY DIFFRACTION 2.46Å

e2oi3A2[A:24-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; SOLUTION NMR

e4glmD2[D:245-301] Image Pymol Jmol Links: PDB, SCOP, CATH

DYNAMIN-BINDING PROTEIN ; ligands: UNX ; X-RAY DIFFRACTION 1.9Å

e4glmB2[B:245-301] Image Pymol Jmol Links: PDB, SCOP, CATH

DYNAMIN-BINDING PROTEIN ; ligands: UNX ; X-RAY DIFFRACTION 1.9Å

e4glmC2[C:246-301] Image Pymol Jmol Links: PDB, SCOP, CATH

DYNAMIN-BINDING PROTEIN ; ligands: UNX ; X-RAY DIFFRACTION 1.9Å

e3uatA6[A:582-711] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DISKS LARGE HOMOLOG 1 ; X-RAY DIFFRACTION 2.7Å

e3tvtA4[A:602-776] Image Pymol Jmol Links: PDB, SCOP, CATH

Disks large 1 tumor suppressor protein ; X-RAY DIFFRACTION 1.6Å

e2oj2A2[A:24-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hematopoetic Cell Kinase, SH3 domain ; SOLUTION NMR

e4d8kA4[A:64-119] Image Pymol Jmol Links: PDB, SCOP, CATH

Tyrosine-protein kinase Lck ; ligands: GOL ; X-RAY DIFFRACTION 2.36Å

e2dybA4[A:172-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NEUTROPHIL CYTOSOL FACTOR 4 ; X-RAY DIFFRACTION 3.15Å

e2dybB5[B:145-149,B:173-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NEUTROPHIL CYTOSOL FACTOR 4 ; X-RAY DIFFRACTION 3.15Å

e4ludA3[A:85-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; ligands: CL,GOL ; X-RAY DIFFRACTION 2.850Å

e4lueB3[B:85-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; ligands: CL,IMD ; X-RAY DIFFRACTION 3.040Å

e4k11A3[A:84-140] Image Pymol Jmol Links: PDB, SCOP, CATH

Proto-oncogene tyrosine-protein kinase Src ; X-RAY DIFFRACTION 2.3Å

e4le9A1[A:83-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTO-ONCOGENE TYROSINE-PROTEIN KINASE SRC ; ligands: PGE ; X-RAY DIFFRACTION 1.34Å

e4jz3A1[A:84-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Src ; ligands: PEG,PGE ; X-RAY DIFFRACTION 1.852Å

e4jz4A1[A:81-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Src ; ligands: EPE,NI ; X-RAY DIFFRACTION 1.560Å

e4jz4B1[B:81-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase Src ; ligands: EPE,NI ; X-RAY DIFFRACTION 1.560Å

e4ludB5[B:85-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; ligands: CL,GOL ; X-RAY DIFFRACTION 2.850Å

e4u5wB2[B:83-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; ligands: MPD ; X-RAY DIFFRACTION 1.86Å

e4u5wD2[D:83-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase HCK ; X-RAY DIFFRACTION 1.86Å

e1g2bA1[A:0-47] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SPECTRIN ALPHA CHAIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.12Å

e1tucA1[A:100-17] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ALPHA-SPECTRIN ; X-RAY DIFFRACTION 2.02Å

e1tudA1[A:49-47] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ALPHA-SPECTRIN ; X-RAY DIFFRACTION 1.77Å

e2fo0A3[A:65-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 (1B ISOFORM) ; X-RAY DIFFRACTION 2.27Å

e1gcpC1[C:596-659] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VAV PROTO-ONCOGENE ; X-RAY DIFFRACTION 2.1Å

e1gcpA1[A:596-659] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VAV PROTO-ONCOGENE ; X-RAY DIFFRACTION 2.1Å

e1gcpB1[B:594-659] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VAV PROTO-ONCOGENE ; X-RAY DIFFRACTION 2.1Å

e1gcpD1[D:596-659] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VAV PROTO-ONCOGENE ; X-RAY DIFFRACTION 2.1Å

e1k1zA1[A:9-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

vav ; SOLUTION NMR

e1jxoB4[B:430-522] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POSTSYNAPTIC DENSITY PROTEIN ; X-RAY DIFFRACTION 2.3Å

e1jxmA4[A:430-522] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POSTSYNAPTIC DENSITY PROTEIN ; X-RAY DIFFRACTION 2.0Å

e1jxoA1[A:430-504] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POSTSYNAPTIC DENSITY PROTEIN ; X-RAY DIFFRACTION 2.3Å

e1kfzA1[A:155-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SEX MUSCLE ABNORMAL PROTEIN 5 ; SOLUTION NMR

e1k76A1[A:3-62] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SEX MUSCLE ABNORMAL PROTEIN 5 ; SOLUTION NMR

e2lcsA1[A:-4-63] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NAP1-BINDING PROTEIN 2 ; SOLUTION NMR

e1yn8A1[A:1-59] Image Pymol Jmol Links: PDB, SCOP, CATH

NAP1-binding protein 2 ; X-RAY DIFFRACTION 1.70Å

e3c0cA1[A:305-368] Image Pymol Jmol Links: PDB, SCOP, CATH

ENDOPHILIN-A2 ; X-RAY DIFFRACTION 1.7Å

e1yn8B1[B:1-59] Image Pymol Jmol Links: PDB, SCOP, CATH

NAP1-binding protein 2 ; ligands: CA ; X-RAY DIFFRACTION 1.70Å

e1yn8C1[C:1-59] Image Pymol Jmol Links: PDB, SCOP, CATH

NAP1-binding protein 2 ; ligands: CA ; X-RAY DIFFRACTION 1.70Å

e1yn8D1[D:1-59] Image Pymol Jmol Links: PDB, SCOP, CATH

NAP1-binding protein 2 ; ligands: CA ; X-RAY DIFFRACTION 1.70Å

e1yn8E1[E:1-59] Image Pymol Jmol Links: PDB, SCOP, CATH

NAP1-binding protein 2 ; ligands: CA ; X-RAY DIFFRACTION 1.70Å

e1yn8F1[F:1-59] Image Pymol Jmol Links: PDB, SCOP, CATH

NAP1-binding protein 2 ; X-RAY DIFFRACTION 1.70Å

e3jv3A2[A:-1-1206] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Intersectin-1 ; X-RAY DIFFRACTION 2.400Å

e3nmzD1[D:172-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Rho guanine nucleotide exchange factor 4 ; X-RAY DIFFRACTION 3.000Å

e2dx1A2[A:114-184] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 4 ; X-RAY DIFFRACTION 2.36Å

e4iimA1[A:915-971] Image Pymol Jmol Links: PDB, SCOP, CATH

Intersectin-1 ; ligands: UNX ; X-RAY DIFFRACTION 1.800Å

e2pz1A1[A:181-254] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Rho guanine nucleotide exchange factor 4 ; X-RAY DIFFRACTION 2.25Å

e3nmzC1[C:171-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Rho guanine nucleotide exchange factor 4 ; X-RAY DIFFRACTION 3.000Å

e2m0yA1[A:1-74] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DEDICATOR OF CYTOKINESIS PROTEIN 1 ; SOLUTION NMR

e1x6bA1[A:1-79] Image Pymol Jmol Links: PDB, SCOP, CATH

Rho guanine exchange factor (GEF) 16 ; SOLUTION NMR

e2knbB1[B:291-352] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDOPHILIN-A1 ; SOLUTION NMR

e2kgtA1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH

Tyrosine-protein kinase 6 ; SOLUTION NMR

e2dilA1[A:1-69] Image Pymol Jmol Links: PDB, SCOP, CATH

Proline-serine-threonine phosphatase-interacting protein 1 ; SOLUTION NMR

e2gncA1[A:6-60] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SLIT-ROBO RHO GTPASE-ACTIVATING PROTEIN 1 ; X-RAY DIFFRACTION 1.8Å

e2eczA1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH

Sorbin and SH3 domain-containing protein 1 ; SOLUTION NMR

e2ew3A1[A:1-60] Image Pymol Jmol Links: PDB, SCOP, CATH

SH3-containing GRB2-like protein 3 ; SOLUTION NMR

e2cucA1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH

SH3 domain containing ring finger 2 ; SOLUTION NMR

e1x2pA1[A:1-68] Image Pymol Jmol Links: PDB, SCOP, CATH

Protein arginine N-methyltransferase 2 ; SOLUTION NMR

e2o2wA1[A:818-884] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PONSIN ; POWDER DIFFRACTION

e2gncB1[B:6-60] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SLIT-ROBO RHO GTPASE-ACTIVATING PROTEIN 1 ; X-RAY DIFFRACTION 1.8Å

e2o31A1[A:818-884] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PONSIN ; ligands: FMT ; X-RAY DIFFRACTION 1.5Å

e2o9sA1[A:818-884] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ponsin ; ligands: CL,NA,SCN ; X-RAY DIFFRACTION 0.83Å

Previous Next

e1gcqC1[C:591-659] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VAV PROTO-ONCOGENE ; X-RAY DIFFRACTION 1.68Å

e1kjwA1[A:430-525] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POSTSYNAPTIC DENSITY PROTEIN 95 ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e1opkA1[A:83-139] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Proto-oncogene tyrosine-protein kinase ABL1 ; X-RAY DIFFRACTION 1.8Å

Domain assembly:

e1ov3A1[A:150-214] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Neutrophil cytosol factor 1 , X-RAY DIFFRACTION 1.8Å

swap

e1ov3B1[B:152-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Neutrophil cytosol factor 1 , X-RAY DIFFRACTION 1.8Å

Domain assembly:

e1i07A1[A:6-64] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPIDERMAL GROWTH FACTOR RECEPTOR KINASE SUBSTRATE EPS8 , X-RAY DIFFRACTION 1.80Å

swap

e1i07B1[B:6-64] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPIDERMAL GROWTH FACTOR RECEPTOR KINASE SUBSTRATE EPS8 , X-RAY DIFFRACTION 1.80Å

e2v1rA1[A:10-76] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PEROXISOMAL MEMBRANE PROTEIN PAS20 ; X-RAY DIFFRACTION 2.11Å

e1k9aA1[A:6-76] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CARBOXYL-TERMINAL SRC KINASE ; X-RAY DIFFRACTION 2.5Å

e1griA1[A:1-56] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

GROWTH FACTOR BOUND PROTEIN 2 ; X-RAY DIFFRACTION 3.1Å

e1griA2[A:157-217] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

GROWTH FACTOR BOUND PROTEIN 2 ; X-RAY DIFFRACTION 3.1Å

e1gl5A1[A:179-245] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYROSINE-PROTEIN KINASE TEC ; SOLUTION NMR

e1k4uS1[S:455-516] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHAGOCYTE NADPH OXIDASE SUBUNIT P67PHOX ; SOLUTION NMR

e1u5sA1[A:1-71] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cytoplasmic protein NCK2 ; SOLUTION NMR

e1ycsB1[B:457-519] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

53BP2 ; X-RAY DIFFRACTION

e2hspA1[A:1-71] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHOSPHOLIPASE C-GAMMA (SH3 DOMAIN) ; SOLUTION NMR

e2rn8A1[A:176-228] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tyrosine-protein kinase ITK/TSK ; SOLUTION NMR

e6amvA1[A:78-139] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ABL1 ; SOLUTION NMR

F: Unmapped domains

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.

beta meanderssingle beta-sheet with mainly meander topology

beta sandwichestwo beta-sheets stacked together to form a sandwich

beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain

beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander

a+b two layersone alpha-helix layer and one beta-sheet layer

a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers

a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers

a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers

a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain

a/b barrelsrepeating beta-alpha units form a barrel

a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers

mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions

few secondary structure elementsstabilized by cofactors or disulfides

extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes