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