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
X: beta-propeller-like
H: beta-propeller
T: 7-bladed
F: WD40
Representatives:
e1yfqA1[A:1-342]
nonrep
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Pymol
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Cell cycle arrest protein BUB3 ; ligands: ACT,CA ; X-RAY DIFFRACTION 1.1Å
e5igoC1[C:352-675]
nonrep
Image
Pymol
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E3 ubiquitin-protein ligase COP1 ; X-RAY DIFFRACTION 1.597Å
e1gxrA1[A:434-770]
nonrep
Image
Pymol
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TRANSDUCIN-LIKE ENHANCER PROTEIN 1 ; ligands: CA ; X-RAY DIFFRACTION 1.600Å
e1nr0A1[A:2-312]
nonrep
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Pymol
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Actin interacting protein 1 ; ligands: MN ; X-RAY DIFFRACTION 1.70Å
e1nr0A2[A:313-611]
nonrep
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Pymol
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Actin interacting protein 1 ; X-RAY DIFFRACTION 1.70Å
e5n4aA1[A:1-298]
nonrep
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Pymol
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Intraflagellar transport protein 80 ; ligands: GOL ; X-RAY DIFFRACTION 1.79Å
e1sq9A1[A:3-395]
nonrep
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Pymol
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Antiviral protein SKI8 ; ligands: SO4 ; X-RAY DIFFRACTION 1.9Å
e1k8kC1[C:2-372]
nonrep
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Pymol
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ARP2/3 COMPLEX 41 KDA SUBUNIT ; X-RAY DIFFRACTION 2.0Å
e4nsxA2[A:350-684]
nonrep
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Pymol
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U3 small nucleolar RNA-associated protein 21 ; X-RAY DIFFRACTION 2.10Å
e5n1aB1[B:2-367]
nonrep
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Pymol
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utp4 ; X-RAY DIFFRACTION 2.15Å
e6b3xA1[A:78-427]
nonrep
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Pymol
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Cleavage stimulation factor subunit 1 ; X-RAY DIFFRACTION 2.3Å
e1erjA1[A:283-710]
nonrep
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Pymol
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TRANSCRIPTIONAL REPRESSOR TUP1 ; X-RAY DIFFRACTION 2.30Å
e1pguA2[A:327-613]
nonrep
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Actin interacting protein 1 ; ligands: ZN ; X-RAY DIFFRACTION 2.30Å
e3mkqA1[A:2-303]
nonrep
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Pymol
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Coatomer beta'-subunit ; X-RAY DIFFRACTION 2.5Å
e2ovrB1[B:2365-2706]
nonrep
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Pymol
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F-box/WD repeat protein 7 ; ligands: SO4 ; X-RAY DIFFRACTION 2.50Å
e5i2tA1[A:344-620,A:678-707]
nonrep
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Pymol
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Periodic tryptophan protein 2 ; X-RAY DIFFRACTION 2.54Å
e5i2tA2[A:4-343]
nonrep
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Pymol
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Periodic tryptophan protein 2 ; ligands: SO4 ; X-RAY DIFFRACTION 2.54Å
e1nexB1[B:370-744]
nonrep
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Pymol
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CDC4 protein ; X-RAY DIFFRACTION 2.7Å
e1p22A1[A:253-545]
nonrep
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Pymol
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F-BOX/WD-REPEAT PROTEIN 1A ; X-RAY DIFFRACTION 2.95Å
e3sfzA5[A:605-916]
nonrep
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Pymol
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APOPTOTIC PEPTIDASE ACTIVATING FACTOR 1 ; ligands: GBL ; X-RAY DIFFRACTION 3.0Å
e5k1cC1[C:1-318,C:363-394,C:509-568]
nonrep
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WD repeat-containing protein 20 ; ligands: TAM ; X-RAY DIFFRACTION 3.0Å
e1vyhC1[C:92-408]
nonrep
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Pymol
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PLATELET-ACTIVATING FACTOR ACETYLHYDROLASE IB ALPHA SUBUNIT ; X-RAY DIFFRACTION 3.4Å
e5cvoA1[A:27-360]
nonrep
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WD repeat-containing protein 48 ; X-RAY DIFFRACTION 3.880Å
e3jroA1[A:8-296]
nonrep
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Pymol
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Fusion Protein of Protein Transport Protein SEC13 and Nucleoporin NUP145 ; X-RAY DIFFRACTION 4.0Å
e4yczA1[A:19-303]
nonrep
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Pymol
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Fusion Protein of Sec13 and Nup145C ; X-RAY DIFFRACTION 4.10Å
e1tbgA1[A:1-340]
nonrep
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Pymol
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TRANSDUCIN ; X-RAY DIFFRACTION
e4ui9R1[R:172-474]
nonrep
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Pymol
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FIZZY-RELATED PROTEIN HOMOLOG ; ELECTRON MICROSCOPY
e5a9q21[2:9-326]
nonrep
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Pymol
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NUCLEOPORIN NUP37 ; ELECTRON MICROSCOPY
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.
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
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