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: Thiamin diphosphate-binding fold (THDP-binding)
H: Thiamin diphosphate-binding fold (THDP-binding)
T: Thiamin diphosphate-binding fold (THDP-binding)
F: TPP_enzyme_C
Representatives:
e1q6zA3[A:342-524]
nonrep
Image
Pymol
Jmol Links:
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CATHDOI
Benzoylformate decarboxylase ; ligands: CA,TZD ; X-RAY DIFFRACTION 1.0Å
e2ez9A3[A:366-593]
nonrep
Image
Pymol
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Pyruvate oxidase ; ligands: FAD,MG,NA,TDK ; X-RAY DIFFRACTION 1.60Å
e2c42A7[A:786-882,A:955-1232]
nonrep
Image
Pymol
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DOI
PYRUVATE-FERREDOXIN OXIDOREDUCTASE ; ligands: CA,MG,PYR,SF4,TPP ; X-RAY DIFFRACTION 1.78Å
e2ji7A3[A:370-552]
nonrep
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Pymol
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OXALYL-COA DECARBOXYLASE ; ligands: ADP,B3P,MG,OXT ; X-RAY DIFFRACTION 1.82Å
e1zpdA3[A:363-566]
nonrep
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Pymol
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PYRUVATE DECARBOXYLASE ; ligands: DPX,MG ; X-RAY DIFFRACTION 1.86Å
e1ozhA3[A:367-558]
nonrep
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Pymol
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ACETOLACTATE SYNTHASE, CATABOLIC ; ligands: HE3,MG,PEG,PO4 ; X-RAY DIFFRACTION 2.0Å
e2ihtA3[A:375-572]
nonrep
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Pymol
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CARBOXYETHYLARGININE SYNTHASE ; ligands: GOL,MG,SO4,TPP ; X-RAY DIFFRACTION 2.0Å
e1t9bA3[A:461-687]
nonrep
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Pymol
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Acetolactate synthase, mitochondrial ; ligands: 1CS,FAD,K,MG,P22,YF3 ; X-RAY DIFFRACTION 2.19Å
e1pvdA3[A:361-556]
nonrep
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Pymol
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PYRUVATE DECARBOXYLASE ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.30Å
e3hwxA2[A:365-556]
nonrep
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Pymol
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2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.40Å
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