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
X: Single-stranded left-handed beta-helix
H: Trimeric LpxA-like enzymes
T: Trimeric LpxA-like enzymes
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:
e4ea7A2[A:95-212]
nonrep
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Perosamine N-acetyltransferase ; ligands: COA,JB2 ; X-RAY DIFFRACTION 1.0Å
e1qreA1[A:4-213]
nonrep
Image
Pymol
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CARBONIC ANHYDRASE ; ligands: BCT,CO ; X-RAY DIFFRACTION 1.46Å
e3bswA2[A:76-195]
nonrep
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Acetyltransferase ; ligands: CIT ; X-RAY DIFFRACTION 1.77Å
e3f1xA1[A:27-300]
* nonrep
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Pymol
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Serine acetyltransferase ; X-RAY DIFFRACTION 2Å
e3brkX2[X:304-418]
* nonrep
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Glucose-1-phosphate adenylyltransferase ; ligands: SO4 ; X-RAY DIFFRACTION 2.1Å
e1yp2A1[A:317-451]
nonrep
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GLUCOSE-1-PHOSPHATE ADENYLYLTRANSFERASE SMALL SUBUNIT ; ligands: PMB,SO4 ; X-RAY DIFFRACTION 2.11Å
e3oh2A2[A:477-610]
* nonrep
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UDP-SUGAR PYROPHOSPHORYLASE ; ligands: GOL ; X-RAY DIFFRACTION 2.14Å
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