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
X: Flavodoxin-like
H: Class I glutamine amidotransferase-like
T: FabD/lysophospholipase-like
F: Acyl_transf_1
Representatives:
e1nm2A2[A:0-133,A:196-314]
nonrep
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malonyl CoA:acyl carrier protein malonyltransferase ; ligands: ACY,NI ; X-RAY DIFFRACTION 2.00Å
e3hhdA1[A:488-615,A:678-842]
nonrep
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Fatty acid synthase ; X-RAY DIFFRACTION 2.15Å
e2jfkA1[A:489-615,A:681-819]
nonrep
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Pymol
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FATTY ACID SYNTHASE ; ligands: COA ; X-RAY DIFFRACTION 2.400Å
e2vz9B3[B:488-615,B:678-839]
nonrep
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FATTY ACID SYNTHASE ; X-RAY DIFFRACTION 3.3Å
e3hmj.1[G:1661-1846,G:1973-2050,A:1-94]
nonrep
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Pymol
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FATTY ACID SYNTHASE SUBUNIT ALPHA & FATTY ACID SYNTHASE SUBUNIT BETA ; X-RAY DIFFRACTION 4.0Å
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.
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