Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
X: HTH
H: HTH
T: winged
F: PCI
Representatives:
e3chmA2[A:87-164]
nonrep
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COP9 signalosome complex subunit 7 ; ligands: ACT,MG ; X-RAY DIFFRACTION 1.5Å
e4k51A2[A:415-493]
nonrep
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Eukaryotic translation initiation factor 3 subunit A ; X-RAY DIFFRACTION 2.65Å
e4u1dA2[A:415-493]
nonrep
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Eukaryotic translation initiation factor 3 subunit A ; X-RAY DIFFRACTION 3.294Å
e4u1cC2[C:706-794]
nonrep
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Eukaryotic translation initiation factor 3 subunit C ; X-RAY DIFFRACTION 3.5Å
e4d10A2[A:404-464]
nonrep
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COP9 SIGNALOSOME COMPLEX SUBUNIT 1 ; X-RAY DIFFRACTION 3.80Å
e4d10D2[D:293-364]
nonrep
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COP9 SIGNALOSOME COMPLEX SUBUNIT 4 ; X-RAY DIFFRACTION 3.80Å
e1ufmA1[A:289-372]
nonrep
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COP9 complex subunit 4 ; SOLUTION NMR
e3j8bA2[A:426-494]
nonrep
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Eukaryotic translation initiation factor 3 subunit A ; ELECTRON MICROSCOPY
e3j8bC2[C:562-636]
nonrep
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Eukaryotic translation initiation factor 3 subunit C ; 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.
T: DNA-binding domain of intron-encoded endonucleases
lacks the N-terminal helix, circularly permuted wing
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
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