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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: ig

PF00047 CL0159

Representatives:

e1nkrA1[A:6-101] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

P58-CL42 KIR ; X-RAY DIFFRACTION 1.7Å

e1nkrA2[A:102-200] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

P58-CL42 KIR ; X-RAY DIFFRACTION 1.7Å

e1olzA1[A:537-628] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SEMAPHORIN 4D ; X-RAY DIFFRACTION 2.000Å

e2nxyB1[B:1001-1097] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T-cell surface glycoprotein CD4 ; X-RAY DIFFRACTION 2.000Å

e1n26A3[A:1-93] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e2c9aA2[A:184-279] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RECEPTOR-TYPE TYROSINE-PROTEIN PHOSPHATASE MU ; ligands: NAG ; X-RAY DIFFRACTION 2.70Å

e1ow0A2[A:242-342] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig alpha-1 chain C region ; ligands: NAG ; X-RAY DIFFRACTION 3.1Å

e1ow0B2[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig alpha-1 chain C region ; ligands: NAG ; X-RAY DIFFRACTION 3.1Å

e2qejA2[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG ALPHA-1 C REGION ; X-RAY DIFFRACTION 3.2Å

e2qejB2[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG ALPHA-1 C REGION ; X-RAY DIFFRACTION 3.2Å

e3cm9A3[A:227-339] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy chain ; SOLUTION SCATTERING

e3cm9B3[B:227-339] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy chain ; SOLUTION SCATTERING

e3cm9C3[C:227-339] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy chain ; SOLUTION SCATTERING

e3cm9D3[D:227-339] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy chain ; SOLUTION SCATTERING

e1r70B3[B:442-553] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Human IgA2(m1) Heavy Chain ; SOLUTION SCATTERING

e1r70D3[D:1117-1229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Human IgA2(m1) Heavy Chain ; SOLUTION SCATTERING

e1igaA4[A:228-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGA1 ; SOLUTION SCATTERING

e1igaB4[B:228-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGA1 ; SOLUTION SCATTERING

e2esgA4[A:228-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin A1 heavy chain ; SOLUTION SCATTERING

e2esgB4[B:228-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin A1 heavy chain ; SOLUTION SCATTERING

e2qtjA4[A:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e2qtjB4[B:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e2qtjC4[C:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e2qtjD4[D:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e3chnA4[A:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e3chnB4[B:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e3chnC4[C:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e3chnD4[D:231-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig alpha-1 chain C region ; SOLUTION SCATTERING

e5t89X3[X:227-334] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 1 ; ligands: NAG ; X-RAY DIFFRACTION 4.000Å

e5t89Y3[Y:227-334] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 1 ; ligands: NAG ; X-RAY DIFFRACTION 4.000Å

e2x1wM1[M:220-326] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VASCULAR ENDOTHELIAL GROWTH FACTOR RECEPTOR 2 ; ligands: NAG ; X-RAY DIFFRACTION 2.7Å

e2x1wN1[N:220-326] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VASCULAR ENDOTHELIAL GROWTH FACTOR RECEPTOR 2 ; ligands: NAG ; X-RAY DIFFRACTION 2.7Å

e2x1wO1[O:220-325] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VASCULAR ENDOTHELIAL GROWTH FACTOR RECEPTOR 2 ; ligands: NAG ; X-RAY DIFFRACTION 2.7Å

e2x1wL4[L:220-326] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VASCULAR ENDOTHELIAL GROWTH FACTOR RECEPTOR 2 ; ligands: NAG ; X-RAY DIFFRACTION 2.7Å

e2x1xR4[R:220-326] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VASCULAR ENDOTHELIAL GROWTH FACTOR RECEPTOR 2 ; ligands: NAG ; X-RAY DIFFRACTION 3.10Å

e3s35X1[X:219-330] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 2 ; ligands: CA,NAG ; X-RAY DIFFRACTION 2.2Å

e3s36X1[X:219-330] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 2 ; X-RAY DIFFRACTION 3.2Å

e3s37X1[X:220-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 2 ; X-RAY DIFFRACTION 2.7Å

e3v6bR4[R:220-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 2 ; X-RAY DIFFRACTION 3.2Å

e3v2aR4[R:220-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vascular endothelial growth factor receptor 2 ; X-RAY DIFFRACTION 3.2Å

e6ue7A2[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue7B2[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue7F2[F:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue7G1[G:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6ue8A2[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue8B2[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue8F1[F:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue8G2[G:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue8E2[E:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue8H1[H:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue8K2[K:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue8L2[L:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue9A2[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue9B2[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue9F1[F:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue9G2[G:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ue9E2[E:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue9H1[H:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue9K2[K:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ue9L2[L:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ueaA1[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ueaB1[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ueaF2[F:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ueaG2[G:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ueaK2[K:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ueaL1[L:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ueaE2[E:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ueaH2[H:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ueaI2[I:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6ueaJ1[J:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 2 ; ELECTRON MICROSCOPY

e6lx3A1[A:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lx3B1[B:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lx3C2[C:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lx3D1[D:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lxwA2[A:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lxwB1[B:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lxwC2[C:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6lxwD1[D:244-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6xjaA2[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6xjaB2[B:241-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e7uvlB2[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin alpha-1 heavy constant ; ELECTRON MICROSCOPY

e7uvlA1[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin alpha-1 heavy constant ; ELECTRON MICROSCOPY

e7ttzA2[A:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IgA Fc ; ligands: 1PG,EDO,GOL,NAG ; X-RAY DIFFRACTION 2.35Å

e7ttzB1[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IgA Fc ; ligands: 1PG,EDO ; X-RAY DIFFRACTION 2.35Å

e8skuB1[B:242-342] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NAG ; ELECTRON MICROSCOPY

e1zvoC4[C:295-397] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin delta heavy chain ; SOLUTION SCATTERING

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