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
X: alpha/beta-Hammerhead/Barrel-sandwich hybrid
H: alpha/beta-Hammerhead/Barrel-sandwich hybrid
T: Single hybrid motif
F: Biotin_lipoyl
Representatives:
e2jkuA1[A:633-667]
nonrep
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PROPIONYL-COA CARBOXYLASE ALPHA CHAIN, MITOCHONDRIAL ; ligands: PG4 ; X-RAY DIFFRACTION 1.50Å
fragment
e1bdoA1[A:77-156]
nonrep
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Pymol
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ACETYL-COA CARBOXYLASE ; ligands: BTN ; X-RAY DIFFRACTION 1.8Å
e1y8oB1[B:128-229]
nonrep
Image
Pymol
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DIHYDROLIPOYLLYSINE-RESIDUE ACETYLTRANSFERASE COMPONENT OF PYRUVATE DEHYDROGENASE COMPLEX ; ligands: RED ; X-RAY DIFFRACTION 2.48Å
e3hb9A8[A:1101-1178]
nonrep
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Pymol
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Pyruvate carboxylase ; ligands: BTI ; X-RAY DIFFRACTION 2.900Å
e4rcnA4[A:479-558]
nonrep
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Pymol
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long-chain acyl-CoA carboxylase ; X-RAY DIFFRACTION 3.0Å
e3n6rA5[A:655-728]
nonrep
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PROPIONYL-COA CARBOXYLASE, ALPHA SUBUNIT ; ligands: BTI ; X-RAY DIFFRACTION 3.2Å
e5cslB2[B:699-769]
nonrep
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Acetyl-CoA carboxylase ; X-RAY DIFFRACTION 3.200Å
e1dczA1[A:47-123]
nonrep
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TRANSCARBOXYLASE 1.3S SUBUNIT ; SOLUTION NMR
e1ghjA1[A:1-79]
nonrep
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Pymol
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E2, THE DIHYDROLIPOAMIDE SUCCINYLTRANSFERASE COMPONENT OF 2-OXOGLUTARATE DEHYDROGENASE COMPLEX ; SOLUTION NMR
e1iyuA1[A:1-79]
nonrep
Image
Pymol
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DIHYDROLIPOAMIDE ACETYLTRANSFERASE COMPONENT OF PYRUVATE DEHYDROGENASE COMPLEX ; 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.
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