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
X: Thioredoxin-like
H: Thioredoxin-like
T: Thioredoxin-like
F: AhpC-TSA
Representatives:
e1lu4A1[A:1001-1134]
nonrep
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Pymol
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SOLUBLE SECRETED ANTIGEN MPT53 ; X-RAY DIFFRACTION 1.12Å
e1st9A1[A:37-173]
nonrep
Image
Pymol
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Thiol-disulfide oxidoreductase resA ; ligands: EDO ; X-RAY DIFFRACTION 1.4Å
e2cvbA1[A:2-188]
nonrep
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Pymol
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PROBABLE THIOL-DISULFIDE ISOMERASE/THIOREDOXIN ; X-RAY DIFFRACTION 1.8Å
e2a4vA1[A:59-214]
nonrep
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Pymol
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Peroxiredoxin DOT5 ; X-RAY DIFFRACTION 1.80Å
e1xvwA1[A:1-153]
nonrep
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HYPOTHETICAL PROTEIN RV2238C/MT2298 ; X-RAY DIFFRACTION 1.9Å
e2hyxA1[A:366-564]
nonrep
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Protein dipZ ; X-RAY DIFFRACTION 1.900Å
e2cx4A1[A:4-163]
nonrep
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Pymol
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BACTERIOFERRITIN COMIGRATORY PROTEIN ; X-RAY DIFFRACTION 2.3Å
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 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