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
X: TIM beta/alpha-barrel
H: TIM barrels
T: TIM barrels
F: Orn_Arg_deC_N
Representatives:
e7odcA2[A:44-283]
nonrep
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Pymol
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PROTEIN (ORNITHINE DECARBOXYLASE) ; ligands: PLP ; X-RAY DIFFRACTION 1.6Å
e1twiA2[A:50-313]
nonrep
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Pymol
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Diaminopimelate decarboxylase ; ligands: LYS,PLP ; X-RAY DIFFRACTION 2.0Å
e1knwA2[A:32-278]
nonrep
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Pymol
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DIAMINOPIMELATE DECARBOXYLASE ; ligands: LI,MES,PLP,SO4 ; X-RAY DIFFRACTION 2.1Å
e3n2oA2[A:71-352]
nonrep
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Pymol
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BIOSYNTHETIC ARGININE DECARBOXYLASE ; ligands: AG2,PLP ; X-RAY DIFFRACTION 2.3Å
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-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