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
X: cradle loop barrel
Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365
X: OB-fold
H: Nucleic acid-binding proteins
T: Nucleic acid-binding proteins
54123, 3-crossover-4
F: tRNA_bind
Representatives:
e1fl0A1[A:150-313]
nonrep
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ENDOTHELIAL-MONOCYTE ACTIVATING POLYPEPTIDE II ; X-RAY DIFFRACTION 1.14Å
e1gd7A1[A:1-109]
nonrep
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Pymol
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CSAA PROTEIN ; X-RAY DIFFRACTION 2.0Å
e2rhsB2[B:41-158]
nonrep
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Phenylalanyl-tRNA synthetase beta chain ; X-RAY DIFFRACTION 2.2Å
e1pybA1[A:5-111]
nonrep
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Pymol
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tRNA-binding protein Trbp111 ; 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.
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
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