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
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




Representatives:
e1g66A1[A:1-207]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
ACETYL XYLAN ESTERASE II ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 0.9Å
e1cexA1[A:17-213]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
CUTINASE ; X-RAY DIFFRACTION 1.0Å
e1cuzA1[A:17-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cuhA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cubA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cudC1[C:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzfA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzkA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DFP ; X-RAY DIFFRACTION 2.01Å
e1ffcA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1ffeA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1ffbA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzkB1[B:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DFP ; X-RAY DIFFRACTION 2.01Å
e1cuuA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzmA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DPE ; X-RAY DIFFRACTION 1.75Å
e1cudB1[B:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzeA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cujA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1oxmA1[A:17-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,
CUTINASE ; ligands: TC4 ; X-RAY DIFFRACTION 2.3Å
e1xzbA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH
CUTINASE ; ligands: MAC ; X-RAY DIFFRACTION
e1agyA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION 1.15Å
e2cutA1[A:17-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION
e1cuwB1[B:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzjA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cugA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1oxmB1[B:17-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,
CUTINASE ; ligands: TC4 ; X-RAY DIFFRACTION 2.3Å
e1cuyA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cuaA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cuvA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cudA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xziA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cuwA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1ffdA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzgA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzlA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: HEE ; X-RAY DIFFRACTION 1.69Å
e1cufA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cucA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzdA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1ffaA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzaA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cusA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1cueA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION 2.15Å
e1cuiA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION 1.5Å
e1cuxA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1xzcA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH
CUTINASE ; ligands: PMB ; X-RAY DIFFRACTION
e1xzhA1[A:17-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION
e1qozA1[A:1-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ACETYL XYLAN ESTERASE ; ligands: NAG ; X-RAY DIFFRACTION 1.900Å
e1bs9A1[A:1-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ACETYL XYLAN ESTERASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.1Å
e2axeA1[A:1-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ACETYL XYLAN ESTERASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.80Å
e1qozB1[B:1-206] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ACETYL XYLAN ESTERASE ; ligands: NAG ; X-RAY DIFFRACTION 1.900Å
e3hc7A1[A:2-253] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Gene 12 protein ; X-RAY DIFFRACTION 2.000Å
e3ef3A1[A:17-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase-1 ; ligands: NXC ; X-RAY DIFFRACTION 1.5Å
e3gbsA1[A:26-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE 1 ; X-RAY DIFFRACTION 1.75Å
e3qpaA1[A:16-212] Image Pymol Jmol Links: PDB, SCOP, CATH
CUTINASE ; X-RAY DIFFRACTION 0.85Å
e3qpdA1[A:26-212] Image Pymol Jmol Links: PDB, SCOP, CATH
CUTINASE 1 ; X-RAY DIFFRACTION 1.57Å
e2czqA1[A:1-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE-LIKE PROTEIN ; ligands: CIT,EDO ; X-RAY DIFFRACTION 1.05Å
e3dcnA1[A:29-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION 1.9Å
e2czqB1[B:1-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE-LIKE PROTEIN ; ligands: CIT,EDO ; X-RAY DIFFRACTION 1.05Å
e3dd5A1[A:31-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5B1[B:31-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5C1[C:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5D1[D:31-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5E1[E:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5F1[F:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5G1[G:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3dd5H1[H:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: DEP ; X-RAY DIFFRACTION 2.6Å
e3deaA1[A:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: HZH ; X-RAY DIFFRACTION 2.3Å
e3deaB1[B:32-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: HZH ; X-RAY DIFFRACTION 2.3Å
e3esaA1[A:17-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase 1 ; ligands: NXC ; X-RAY DIFFRACTION 2.0Å
e3esaB1[B:17-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase 1 ; ligands: NXC ; X-RAY DIFFRACTION 2.0Å
e3esbA1[A:16-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase 1 ; ligands: NXC ; X-RAY DIFFRACTION 2.3Å
e3escA1[A:17-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase 1 ; ligands: SXC ; X-RAY DIFFRACTION 1.2Å
e3esdA1[A:17-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase 1 ; ligands: SXC ; X-RAY DIFFRACTION 1.22Å
e3qpcA1[A:16-212] Image Pymol Jmol Links: PDB, SCOP, CATH
CUTINASE ; X-RAY DIFFRACTION 0.98Å
e3ajaA2[A:71-277,A:297-334] Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE UNCHARACTERIZED PROTEIN ; X-RAY DIFFRACTION 2.9Å
e3ajaB2[B:71-277,B:297-334] Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE UNCHARACTERIZED PROTEIN ; X-RAY DIFFRACTION 2.9Å
e4oylA1[A:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 2.05Å
e4oylB1[B:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 2.05Å
e4oylC1[C:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 2.05Å
e4oyyA1[A:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyB1[B:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyC1[C:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyD1[D:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyE1[E:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyF1[F:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyG1[G:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyH1[H:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyI1[I:1-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyJ1[J:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyK1[K:3-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4oyyL1[L:2-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Cutinase ; X-RAY DIFFRACTION 3.00Å
e4pscA1[A:31-250] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Carbohydrate esterase family 5 ; ligands: GOL ; X-RAY DIFFRACTION 1.150Å
e4psdA1[A:30-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Carbohydrate esterase family 5 ; X-RAY DIFFRACTION 1.52Å
e4pseA1[A:31-250] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Carbohydrate esterase family 5 ; ligands: BOG,C11 ; X-RAY DIFFRACTION 1.71Å
e4pseB1[B:31-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Carbohydrate esterase family 5 ; ligands: BOG,C11 ; X-RAY DIFFRACTION 1.71Å
e5ajhA1[A:18-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: MPD ; X-RAY DIFFRACTION 1.90Å
e5ajhB1[B:18-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; ligands: MPD ; X-RAY DIFFRACTION 1.90Å
e5ajhC1[C:18-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CUTINASE ; X-RAY DIFFRACTION 1.90Å
e5w95B1[B:65-276,B:296-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Conserved membrane protein of uncharacterised function ; ligands: 1PE ; X-RAY DIFFRACTION 1.72Å
e5x88A1[A:13-199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
cutinase ; X-RAY DIFFRACTION 1.76Å
e5w95A1[A:71-276,A:296-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Conserved membrane protein of uncharacterised function ; ligands: 1PE ; X-RAY DIFFRACTION 1.72Å
e7cc4A1[A:2-198] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase-like enzyme ; X-RAY DIFFRACTION 2.000Å
e7cc4B1[B:2-198] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase-like enzyme ; ligands: NA ; X-RAY DIFFRACTION 2.000Å
e7cy3A1[A:3-195] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase ; ligands: CAD,NA ; X-RAY DIFFRACTION 1.270Å
e7cy3B1[B:1-195] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase ; ligands: CAD,NA ; X-RAY DIFFRACTION 1.270Å
e7cy9A1[A:1-195] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase ; ligands: CAD,NA ; X-RAY DIFFRACTION 1.360Å
e7cy9B1[B:3-194] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase ; ligands: CAD,NA ; X-RAY DIFFRACTION 1.360Å
e7cw1A1[A:2-198] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase-like enzyme ; ligands: CAD,NA ; X-RAY DIFFRACTION 1.700Å
e7cw1B1[B:2-198] Image Pymol Jmol Links: PDB, SCOP, CATH
Cutinase-like enzyme ; ligands: CAD ; X-RAY DIFFRACTION 1.700Å

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