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: Protein kinase/SAICAR synthase/ATP-grasp
H: Protein kinase/SAICAR synthase/ATP-grasp
T: Protein kinase
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:
e6oqqA2[A:322-739]
nonrep
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Legionella pneumophila SidJ ; ligands: AMP,EDO,MG,NA,POP ; X-RAY DIFFRACTION 2.100Å
e3vwaA1[A:5-242]
* nonrep
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Pymol
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CYTOPLASMIC EXPORT PROTEIN 1 ; X-RAY DIFFRACTION 2.2Å
e4o7oB2[B:94-455]
nonrep
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Pymol
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Maltokinase ; X-RAY DIFFRACTION 2.4Å
e4cyiD1[D:214-497]
nonrep
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PAB-DEPENDENT POLY(A)-SPECIFIC RIBONUCLEASE SUBUNIT PAN3-LIKE PROTEIN, PAB-DEPENDENT POLY(A)-SPECIFIC RIBONUCLEASE SUBUNIT PAN3-L PROTEIN ; ligands: ATP,MG ; X-RAY DIFFRACTION 2.42Å
e6pwdA1[A:25-200]
nonrep
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Type III effector HopBF1 ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.47Å
e6mcpA1[A:170-474]
nonrep
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LegK7 ; ligands: ANP,P6G,PEG,PG4 ; X-RAY DIFFRACTION 2.500Å
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