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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

beta meanderssingle beta-sheet with mainly meander topology

beta sandwichestwo beta-sheets stacked together to form a sandwich

X: Immunoglobulin-like beta-sandwich
H: Immunoglobulin-related
T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like
F: fn3

PF00041 CL0159

Representatives:

e2ic2A1[A:466-572] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CG9211-PA ; ligands: SO4 ; X-RAY DIFFRACTION 1.300Å

e2hazA1[A:489-589] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NEURAL CELL ADHESION MOLECULE 1 ; ligands: NA ; X-RAY DIFFRACTION 1.7Å

e1fnaA1[A:6-96] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FIBRONECTIN CELL-ADHESION MODULE TYPE III-10 ; X-RAY DIFFRACTION 1.8Å

e1bquA2[A:100-214] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (GP130) ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.0Å

e1fnfA2[A:1142-1235] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FIBRONECTIN ; X-RAY DIFFRACTION 2.0Å

e1fnfA3[A:1236-1326] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FIBRONECTIN ; X-RAY DIFFRACTION 2.0Å

e1fnfA4[A:1327-1415] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FIBRONECTIN ; X-RAY DIFFRACTION 2.0Å

e1axiB2[B:131-236] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GROWTH HORMONE RECEPTOR ; ligands: SO4 ; X-RAY DIFFRACTION 2.1Å

e1qg3A1[A:1126-1217] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (INTEGRIN BETA-4 SUBUNIT) ; ligands: SO4 ; X-RAY DIFFRACTION 2.15Å

e1qg3A2[A:1218-1320] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (INTEGRIN BETA-4 SUBUNIT) ; ligands: CAC ; X-RAY DIFFRACTION 2.15Å

e2ibgA2[A:573-667] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CG9211-PA ; ligands: PO4 ; X-RAY DIFFRACTION 2.2Å

e1f6fB2[B:101-203] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROLACTIN RECEPTOR ; X-RAY DIFFRACTION 2.3Å

e2vkwA2[A:601-693] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NEURAL CELL ADHESION MOLECULE 1,140 KDA ISOFORM ; ligands: SO4 ; X-RAY DIFFRACTION 2.30Å

e1ernA2[A:117-221] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (ERYTHROPOIETIN RECEPTOR) ; X-RAY DIFFRACTION 2.4Å

e1n26A2[A:196-299] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IL-6 Receptor alpha chain ; ligands: CYS,NAG,SO4 ; X-RAY DIFFRACTION 2.4Å

e1qr4A1[A:1-87] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (TENASCIN) ; X-RAY DIFFRACTION 2.55Å

e1qr4A2[A:88-175] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (TENASCIN) ; X-RAY DIFFRACTION 2.55Å

e1tdqA2[A:94-185] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tenascin-R ; X-RAY DIFFRACTION 2.57Å

e1tdqA3[A:186-271] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tenascin-R ; X-RAY DIFFRACTION 2.57Å

e2gysA4[A:317-416] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cytokine receptor common beta chain ; X-RAY DIFFRACTION 2.7Å

e4go6.1[A:360-400,B:1811-1888] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HCF C-TERMINAL CHAIN 1 & HCF N-TERMINAL CHAIN 1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e1fnhA2[A:3-92] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (FIBRONECTIN) ; X-RAY DIFFRACTION 2.8Å

e1fnhA3[A:93-182] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (FIBRONECTIN) ; X-RAY DIFFRACTION 2.8Å

e5fmvA3[A:387-480] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RECEPTOR-TYPE TYROSINE-PROTEIN PHOSPHATASE C ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 2.90Å

e5fmvA4[A:481-574] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RECEPTOR-TYPE TYROSINE-PROTEIN PHOSPHATASE C ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 2.90Å

e4zxbE2[E:593-637,E:754-807] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Insulin receptor ; ligands: FUC,NAG ; X-RAY DIFFRACTION 3.3Å

e4zxbE3[E:808-909] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Insulin receptor ; ligands: FUC,NAG ; X-RAY DIFFRACTION 3.3Å

e4bk4A4[A:328-437] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPHRIN TYPE-A RECEPTOR 4 ; X-RAY DIFFRACTION 3.65Å

e4bk4A5[A:438-540] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPHRIN TYPE-A RECEPTOR 4 ; X-RAY DIFFRACTION 3.65Å

e1bpvA1[A:0-103] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TITIN ; SOLUTION NMR

e1cfbA1[A:610-709] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DROSOPHILA NEUROGLIAN ; ligands: NA,NAG,SO4 ; X-RAY DIFFRACTION

e1j8kA1[A:1-94] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FIBRONECTIN ; SOLUTION NMR

e1k85A1[A:557-644] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A1 ; SOLUTION NMR

e1owwA1[A:1-93] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fibronectin first type III module ; SOLUTION NMR

e1tenA1[A:802-891] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

TENASCIN ; X-RAY DIFFRACTION

e1uc6A1[A:1-109] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ciliary Neurotrophic Factor Receptor alpha ; SOLUTION NMR

e1uemA1[A:1-117] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA1568 Protein ; SOLUTION NMR

e1uenA1[A:1-125] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA0343 protein ; SOLUTION NMR

e1ueyA1[A:1-127] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA0343 protein ; SOLUTION NMR

e1ujtA1[A:1-120] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA1568 protein ; SOLUTION NMR

e1v5jA1[A:1-108] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA1355 protein ; SOLUTION NMR

e1va9A1[A:8-116] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Down syndrome cell adhesion molecule like-protein 1b ; SOLUTION NMR

e1wf5A1[A:8-115] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

sidekick 2 protein ; SOLUTION NMR

e4o00B1[B:3-106] Image Pymol Jmol Links: PDB, SCOP, CATH

Titin ; X-RAY DIFFRACTION 1.850Å

e4o00A1[A:3-104] Image Pymol Jmol Links: PDB, SCOP, CATH

Titin ; X-RAY DIFFRACTION 1.850Å

e2db8A1[A:1-110] Image Pymol Jmol Links: PDB, SCOP, CATH

Tripartite motif protein 9, isoform 2 ; SOLUTION NMR

e1wfnA1[A:8-113] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

sidekick 2 ; SOLUTION NMR

e1wfoA1[A:8-124] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

sidekick 2 ; SOLUTION NMR

e1wisA1[A:8-118] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA1514 protein ; SOLUTION NMR

e1wj3A1[A:1-117] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA1496 protein ; SOLUTION NMR

e1wk0A1[A:1-137] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KIAA0970 protein ; SOLUTION NMR

e1x3dA1[A:8-112] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Fibronectin type-III domain containing protein 3a ; SOLUTION NMR

e1x4xA1[A:8-100] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Fibronectin type-III domain containing protein 3a ; SOLUTION NMR

e1x4yA1[A:8-108] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

biregional cell adhesion molecule-related/down-regulated oncogenes (Cdon)binding protein ; SOLUTION NMR

e1x4zA1[A:8-115] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

biregional cell adhesion molecule-related/down-regulated oncogenes (Cdon)binding protein ; SOLUTION NMR

e1x5aA1[A:8-101] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Ephrin type-A receptor 1 ; SOLUTION NMR

e1x5fA1[A:8-114] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Neogenin ; SOLUTION NMR

e1x5gA1[A:8-110] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Neogenin ; SOLUTION NMR

e1x5hA1[A:8-126] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Neogenin ; SOLUTION NMR

e1x5iA1[A:8-120] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Neogenin ; SOLUTION NMR

e1x5jA1[A:8-107] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Neogenin ; SOLUTION NMR

e1x5kA1[A:8-118] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Neogenin ; SOLUTION NMR

e1x5xA1[A:8-103] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Fibronectin type-III domain containing protein 3a ; SOLUTION NMR

e1x5yA1[A:8-105] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

myosin binding protein C, fast-type ; SOLUTION NMR

e1x5zA1[A:8-109] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Receptor-type tyrosine-protein phosphatase delta ; SOLUTION NMR

e1zlgA3[A:183-286] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anosmin 1 ; SOLUTION SCATTERING

e1zlgA4[A:287-408] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anosmin 1 ; SOLUTION SCATTERING

e1zlgA6[A:532-703] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anosmin 1 ; SOLUTION SCATTERING

e2crmA1[A:8-114] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Fibronectin type-III domain containing protein 3a ; SOLUTION NMR

e2crzA1[A:8-104] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Fibronectin type-III domain containing protein 3a ; SOLUTION NMR

e2cspA1[A:8-124] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

RIM binding protein 2 ; SOLUTION NMR

e2cuhA1[A:8-109] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tenascin-X ; SOLUTION NMR

e2cuiA1[A:6-106] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tenascin-X ; SOLUTION NMR

e2cumA1[A:7-99] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tenascin-X ; SOLUTION NMR

e2djsA1[A:8-102] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Ephrin type-B receptor 1 ; SOLUTION NMR

e2dn7A1[A:8-101] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Receptor-type tyrosine-protein phosphatase F ; SOLUTION NMR

e2fnbA1[A:1-95] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (FIBRONECTIN) ; 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.

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

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