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
X: ISP domain
H: ISP domain
T: ISP domain
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:
e1jm1A1[A:49-138,A:195-250]
nonrep
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RIESKE IRON-SULFUR PROTEIN SOXF ; X-RAY DIFFRACTION 1.11Å
e2bmoA1[A:3-77,A:134-152]
nonrep
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OXYGENASE-ALPHA NBDO ; ligands: EDO,EOH ; X-RAY DIFFRACTION 1.200Å
e1nykA1[A:46-130,A:175-201]
nonrep
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RIESKE IRON-SULFUR PROTEIN ; X-RAY DIFFRACTION 1.31Å
e1vm9A1[A:2-43,A:86-110]
nonrep
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Toluene-4-monooxygenase system protein C ; ligands: EDO,MG ; X-RAY DIFFRACTION 1.48Å
e1rieA1[A:70-137,A:180-196]
nonrep
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RIESKE IRON-SULFUR PROTEIN ; X-RAY DIFFRACTION 1.5Å
e2i7fA4[A:3-43,A:87-104]
* nonrep
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Ferredoxin component of dioxygenase ; ligands: SO4 ; X-RAY DIFFRACTION 1.620Å
e1g8kB1[B:1-58,B:101-133]
nonrep
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ARSENITE OXIDASE ; X-RAY DIFFRACTION 1.64Å
e5cxmA2[A:35-75,A:114-133]
* nonrep
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Cytochrome b6/f complex iron-sulfur subunit ; X-RAY DIFFRACTION 1.7Å
e3gkeC2[C:2-46,C:97-120]
nonrep
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DdmC ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3gl0C1[C:2-46,C:97-120]
* nonrep
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DdmC ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e1rfsA1[A:53-105,A:147-179]
nonrep
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RIESKE PROTEIN ; X-RAY DIFFRACTION 1.83Å
e6ickA3[A:7-60,A:111-136]
* nonrep
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Methylxanthine N1-demethylase NdmA ; X-RAY DIFFRACTION 1.95Å
e2b1xA1[A:1-86,A:144-162]
nonrep
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NAPHTHALENE DIOXYGENASE LARGE SUBUNIT ; X-RAY DIFFRACTION 2.0Å
e2de7E1[E:3-44,E:88-109]
* nonrep
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FERREDOXIN COMPONENT OF CARBAZOLE ; X-RAY DIFFRACTION 2.0Å
e2e4pA1[A:2-37,A:82-109]
* nonrep
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BIPHENYL DIOXYGENASE FERREDOXIN SUBUNIT ; ligands: FES,SO4,TRE ; X-RAY DIFFRACTION 2.0Å
e1uliA1[A:17-96,A:152-170]
nonrep
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BIPHENYL DIOXYGENASE LARGE SUBUNIT ; X-RAY DIFFRACTION 2.2Å
e4emjB1[B:0-36,B:80-106]
* nonrep
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Toluene 1,2-dioxygenase system ferredoxin subunit ; X-RAY DIFFRACTION 2.4Å
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