Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices
X: "fingers" domain in bacteriophage RB69-like DNA polymerase I
H: "fingers" domain in bacteriophage RB69-like DNA polymerase I
T: "fingers" domain in bacteriophage RB69-like DNA polymerase I
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.
Representatives:
e1q8iA2[A:465-507]
nonrep
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DNA polymerase II ; X-RAY DIFFRACTION 2.00Å
e4m3rA9[A:469-574]
* nonrep
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DNA polymerase ; ligands: ATP,CA ; X-RAY DIFFRACTION 2.07Å
e4m8oA5[A:767-838]
nonrep
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DNA POLYMERASE EPSILON CATALYTIC SUBUNIT A ; ligands: DTP ; X-RAY DIFFRACTION 2.2Å
e1ih7A1[A:469-574]
nonrep
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Pymol
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DNA POLYMERASE ; X-RAY DIFFRACTION 2.21Å
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