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
X: second helical domain in RNA-polymerase beta-prime subunit
H: second helical domain in RNA-polymerase beta-prime subunit
T: second helical domain in RNA-polymerase beta-prime subunit
F: RNA_pol_Rpb1_5,RNA_pol_Rpb1_4
Representatives:
e1twfA10[A:663-871]
nonrep
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Pymol
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DNA-DIRECTED RNA POLYMERASE II LARGEST SUBUNIT ; X-RAY DIFFRACTION 2.3Å
e2a69D7[D:949-1109]
nonrep
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Pymol
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DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å
e2o5iD7[D:949-1109]
nonrep
Image
Pymol
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DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; X-RAY DIFFRACTION 2.5Å
e3dxjN4[N:949-1109]
nonrep
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Pymol
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BACTRIAL RNA POLYMERASE BETA-PRIME SUBUNIT ; ligands: MPD,NE6 ; X-RAY DIFFRACTION 3.0Å
e4c3hA5[A:827-1053]
nonrep
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Pymol
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DNA-DIRECTED RNA POLYMERASE I SUBUNIT RPA190 ; X-RAY DIFFRACTION 3.27Å
e4bxxA5[A:663-871]
nonrep
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DNA-DIRECTED RNA POLYMERASE II SUBUNIT RPB1 ; X-RAY DIFFRACTION 3.28Å
e2pmzA5[A:645-879]
nonrep
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DNA-directed RNA polymerase subunit A ; X-RAY DIFFRACTION 3.400Å
e4ljzD5[D:639-810]
nonrep
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DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.5871Å
e3wodD9[D:949-1109]
nonrep
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Pymol
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DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.6Å
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.
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