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
X: Alpha-beta plaits
H: Dimeric alpha+beta barrel
T: Dimeric alpha+beta barrel
F: ABM
Representatives:
e1lq9A1[A:2-113]
nonrep
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ACTVA-ORF6 MONOOXYGENASE ; ligands: PG4 ; X-RAY DIFFRACTION 1.30Å
e2zdpA1[A:0-108]
nonrep
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HEME-DEGRADING MONOOXYGENASE ISDI ; ligands: CL,COH ; X-RAY DIFFRACTION 1.5Å
e1iujA1[A:1-102]
nonrep
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Pymol
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HYPOTHETICAL PROTEIN TT1380 ; ligands: ZN ; X-RAY DIFFRACTION 1.6Å
e1y0hA1[A:1-101]
nonrep
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hypothetical protein Rv0793 ; ligands: ACT ; X-RAY DIFFRACTION 1.60Å
e1tuvA1[A:1-103]
nonrep
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Protein ygiN ; ligands: VK3 ; X-RAY DIFFRACTION 1.69Å
e1x7vA1[A:0-97]
nonrep
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PA3566 PROTEIN ; X-RAY DIFFRACTION 1.78Å
e1tz0A1[A:2-109]
nonrep
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HYPOTHETICAL PROTEIN ; ligands: EDO,FMT ; X-RAY DIFFRACTION 1.84Å
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 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