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:
e2bw4A1[A:8-164]
nonrep
Image
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COPPER-CONTAINING NITRITE REDUCTASE ; ligands: CU,SO4 ; X-RAY DIFFRACTION 0.9Å
e2q9oA1[A:1-162]
nonrep
Image
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LACCASE-1 ; ligands: CL,CU,MAN,NAG,OXY ; X-RAY DIFFRACTION 1.3Å
e1kv7A1[A:31-170]
nonrep
Image
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PROBABLE BLUE-COPPER PROTEIN YACK ; ligands: C2O,CU ; X-RAY DIFFRACTION 1.4Å
e1hfuA1[A:1-131]
nonrep
Image
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LACCASE 1 ; ligands: CU ; X-RAY DIFFRACTION 1.680Å
e1gskA1[A:2-182]
nonrep
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SPORE COAT PROTEIN A ; ligands: C1O,C2O,GOL ; X-RAY DIFFRACTION 1.7Å
e1aozA1[A:1-129]
nonrep
Image
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ASCORBATE OXIDASE ; ligands: C1O,C2O,NAG ; X-RAY DIFFRACTION 1.9Å
e1kbvA1[A:13-163]
nonrep
Image
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Major outer membrane protein PAN 1 ; ligands: CU,NO2 ; X-RAY DIFFRACTION 1.95Å
e3gyrA1[A:37-230]
nonrep
Image
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Phenoxazinone synthase ; ligands: C2O,CU ; X-RAY DIFFRACTION 2.300Å
e1sddB3[B:1538-1723]
nonrep
Image
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COAGULATION FACTOR V ; ligands: NAG,NDG ; X-RAY DIFFRACTION 2.8Å
e2j5wA1[A:1-192]
nonrep
Image
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CERULOPLASMIN ; ligands: CA,CU,GOL,NA,NAG,O,OXY ; X-RAY DIFFRACTION 2.8Å
e2j5wA4[A:347-553]
nonrep
Image
Pymol
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CERULOPLASMIN ; ligands: NA,NAG ; X-RAY DIFFRACTION 2.8Å
e2r7eA4[A:1-190] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; ligands: CA ; X-RAY DIFFRACTION 3.60Å
e4enzA9[A:343-554] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CERULOPLASMIN ; ligands: NAG ; X-RAY DIFFRACTION 2.6Å
e4ejxA12[A:343-554] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CERULOPLASMIN ; ligands: NAG ; X-RAY DIFFRACTION 4.69Å
e4enzA3[A:702-885] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CERULOPLASMIN ; X-RAY DIFFRACTION 2.6Å
e3cdzA2[A:377-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII heavy chain ; X-RAY DIFFRACTION 3.98Å
e3j2sB8[B:1691-1871] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII light chain ; ELECTRON MICROSCOPY
e1sddA3[A:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
COAGULATION FACTOR V ; ligands: CA ; X-RAY DIFFRACTION 2.8Å
e2r7eB12[B:1689-1871] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; X-RAY DIFFRACTION 3.60Å
e4bdvA13[A:1-16,A:44-190] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FACTOR VIIIA HEAVY CHAIN, 92 KDA ISOFORM, B DOMAIN ; ligands: CA ; X-RAY DIFFRACTION 3.98Å
e3cdzB11[B:1691-1871] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII light chain ; ligands: NAG ; X-RAY DIFFRACTION 3.98Å
e3j2qB11[B:1691-1871] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
COAGULATION FACTOR VIII LIGHT CHAIN ; ligands: NAG ; ELECTRON CRYSTALLOGRAPHY 15.0Å
e3cdzA9[A:1-16,A:44-190] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII heavy chain ; ligands: CA ; X-RAY DIFFRACTION 3.98Å
e3j2qA11[A:1-16,A:44-190] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
COAGULATION FACTOR VIII HEAVY CHAIN ; ligands: CA,NAG ; ELECTRON CRYSTALLOGRAPHY 15.0Å
e4bdvB3[B:1693-1871] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FACTOR VIIIA LIGHT CHAIN ; ligands: EDO ; X-RAY DIFFRACTION 3.98Å
e1kcwA3[A:343-554] Image Pymol Jmol Links: PDB, SCOP, CATH
CERULOPLASMIN ; X-RAY DIFFRACTION 3.0Å
e4bdvA14[A:377-565] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FACTOR VIIIA HEAVY CHAIN, 92 KDA ISOFORM, B DOMAIN ; X-RAY DIFFRACTION 3.98Å
e2r7eA8[A:384-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; ligands: CA ; X-RAY DIFFRACTION 3.60Å
e5k8dB2[B:1694-1871] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII,Ig gamma-1 chain C region ; ligands: NAG ; X-RAY DIFFRACTION 4.200Å
e3j2qA12[A:377-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
COAGULATION FACTOR VIII HEAVY CHAIN ; ELECTRON CRYSTALLOGRAPHY 15.0Å
e6mf0A7[A:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera ; ligands: NAG ; X-RAY DIFFRACTION 3.198Å
e4ejxA13[A:703-887] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CERULOPLASMIN ; X-RAY DIFFRACTION 4.69Å
e6mf2A6[A:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; ligands: NAG ; X-RAY DIFFRACTION 3.609Å
e6mf0B6[B:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera ; ligands: NAG ; X-RAY DIFFRACTION 3.198Å
e1kcwA2[A:702-885] Image Pymol Jmol Links: PDB, SCOP, CATH
CERULOPLASMIN ; ligands: NAG ; X-RAY DIFFRACTION 3.0Å
e4bxsV2[V:1-179] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
VENOM PROTHROMBIN ACTIVATOR PSEUTARIN-C NON-CATALYTIC SUBUNIT ; ligands: CA,CU,NAG ; X-RAY DIFFRACTION 3.32Å
e7k66A3[A:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII ; X-RAY DIFFRACTION 3.92Å
e4bxsV4[V:321-511] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
VENOM PROTHROMBIN ACTIVATOR PSEUTARIN-C NON-CATALYTIC SUBUNIT ; ligands: NAG ; X-RAY DIFFRACTION 3.32Å
e7kbtA1[A:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII ; ligands: NAG ; X-RAY DIFFRACTION 4.15Å
e4bxsV6[V:793-972] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
VENOM PROTHROMBIN ACTIVATOR PSEUTARIN-C NON-CATALYTIC SUBUNIT ; ligands: CA,NAG ; X-RAY DIFFRACTION 3.32Å
e7kwoA7[A:1675-1869] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor FVIII-Fc-XTEN ; ligands: NAG ; ELECTRON MICROSCOPY
e8g6iA3[A:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera from human and pig ; ELECTRON MICROSCOPY
e4ejxA1[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CERULOPLASMIN ; ligands: CU,NAG ; X-RAY DIFFRACTION 4.69Å
e4enzA2[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CERULOPLASMIN ; ligands: CA,CU,NA,NAG,O,OXY ; X-RAY DIFFRACTION 2.6Å
e8ty1A8[A:1693-1869] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e1kcwA5[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH
CERULOPLASMIN ; ligands: CU,NAG,O ; X-RAY DIFFRACTION 3.0Å
e5k8dA3[A:1-16,A:44-190] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; ligands: CA,NAG ; X-RAY DIFFRACTION 4.200Å
e5k8dA1[A:375-565] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; ligands: CA ; X-RAY DIFFRACTION 4.200Å
e5n0kA6[A:696-879] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; X-RAY DIFFRACTION 2.3Å
e5n0kA1[A:342-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; ligands: CU,NAG ; X-RAY DIFFRACTION 2.3Å
e5n0kA3[A:1-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; ligands: CA,CU,NA ; X-RAY DIFFRACTION 2.3Å
e5n4lA3[A:696-879] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; X-RAY DIFFRACTION 3.2Å
e5n4lB3[B:696-879] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; X-RAY DIFFRACTION 3.2Å
e5n4lA6[A:342-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; X-RAY DIFFRACTION 3.2Å
e5n4lB1[B:342-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; X-RAY DIFFRACTION 3.2Å
e5n4lA1[A:1-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; ligands: CA,CU,NA ; X-RAY DIFFRACTION 3.2Å
e5n4lB4[B:1-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ceruloplasmin ; ligands: CA,CU,NA ; X-RAY DIFFRACTION 3.2Å
e6mf0A4[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera ; ligands: CA,NAG ; X-RAY DIFFRACTION 3.198Å
e6mf2A2[A:1-19,A:43-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; ligands: CA,NAG ; X-RAY DIFFRACTION 3.609Å
e6mf0A2[A:377-566] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera ; X-RAY DIFFRACTION 3.198Å
e6mf2A1[A:377-566] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII ; X-RAY DIFFRACTION 3.609Å
e6mf0B2[B:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera ; ligands: CA,NAG ; X-RAY DIFFRACTION 3.198Å
e6mf0B4[B:377-566] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera ; X-RAY DIFFRACTION 3.198Å
e7k66A1[A:361-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII ; X-RAY DIFFRACTION 3.92Å
e7k66A2[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII ; ligands: CA,NAG ; X-RAY DIFFRACTION 3.92Å
e7kbtA2[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII ; ligands: CA ; X-RAY DIFFRACTION 4.15Å
e7kbtA5[A:377-566] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII,Coagulation factor VIII ; X-RAY DIFFRACTION 4.15Å
e7kwoA3[A:1-17,A:45-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor FVIII-Fc-XTEN ; ligands: CA,NAG ; ELECTRON MICROSCOPY
e7kwoA1[A:379-566] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor FVIII-Fc-XTEN ; ELECTRON MICROSCOPY
e7kxyA3[A:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor Va ; ELECTRON MICROSCOPY
e7kxyA4[A:315-509] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor Va ; ELECTRON MICROSCOPY
e7tppC1[C:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor Va ; ELECTRON MICROSCOPY
e7tpqC2[C:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor Va ; ELECTRON MICROSCOPY
e7tppC2[C:309-511,C:667-709] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor Va ; ELECTRON MICROSCOPY
e7tpqC3[C:309-511,C:667-709] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor Va ; ELECTRON MICROSCOPY
e7kveB2[B:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor V ; ELECTRON MICROSCOPY
e7kvfB2[B:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor V ; ELECTRON MICROSCOPY
e7kveB1[B:309-511,B:667-713] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor V ; ELECTRON MICROSCOPY
e7kvfB1[B:309-511,B:667-713] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor V ; ELECTRON MICROSCOPY
e8g6iA5[A:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera from human and pig ; ELECTRON MICROSCOPY
e8g6iA1[A:377-566] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coagulation factor VIII chimera from human and pig ; ELECTRON MICROSCOPY
e8ty1A4[A:1-26,A:47-193] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e8ty1A7[A:377-566] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY

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