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
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
X: Nucleotide-diphospho-sugar transferases
H: Nucleotide-diphospho-sugar transferases
T: Nucleotide-diphospho-sugar transferases
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:
e2nxvA1[A:1-249]
* nonrep
Image
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ATP synthase subunits region ORF 6 ; ligands: GOL ; X-RAY DIFFRACTION 1.100Å
e5h61A1[A:39-340]
* nonrep
Image
Pymol
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Transferase ; X-RAY DIFFRACTION 1.86Å
e2c0nA1[A:1-200]
nonrep
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Pymol
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A197 ; ligands: DIO,NI,SO4 ; X-RAY DIFFRACTION 1.860Å
e6aciA1[A:-1-329]
* nonrep
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Pymol
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T3SS secreted effector NleB homolog ; ligands: MN,UDP ; X-RAY DIFFRACTION 1.87Å
e6eytA1[A:27-335]
nonrep
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Pymol
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Type III secretion system effector protein ; ligands: IOD,MN,NDG,UDP ; X-RAY DIFFRACTION 2.21Å
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