Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
X: EF-hand
H: EF-hand-related
T: EF-hand
F: EF-hand_1
Representatives:
e1exrA1[A:2-79]
nonrep
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CALMODULIN ; ligands: CA ; X-RAY DIFFRACTION 1.000Å
e1qv0A1[A:108-195]
nonrep
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Obelin ; ligands: CO,CZH,GOL,K ; X-RAY DIFFRACTION 1.1Å
e1qx2A1[A:0-75]
nonrep
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Vitamin D-dependent calcium-binding protein, intestinal ; ligands: CA,ZN ; X-RAY DIFFRACTION 1.44Å
Domain assembly:
e1auiB1[B:5-85]
nonrep
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SERINE/THREONINE PHOSPHATASE 2B ; ligands: CA ; X-RAY DIFFRACTION 2.1Å
e1c7vA1[A:87-154]
nonrep
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CALCIUM VECTOR PROTEIN ; SOLUTION NMR
Domain assembly:
e1jfjA2[A:67-134]
nonrep
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CALCIUM-BINDING PROTEIN ; SOLUTION NMR
e1nyaA2[A:92-176]
nonrep
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Calerythrin ; ligands: CA ; SOLUTION NMR
e1s6iA1[A:1-79]
nonrep
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Calcium-dependent protein kinase SK5 ; ligands: CA ; SOLUTION NMR
e1s6iA2[A:80-182]
nonrep
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Calcium-dependent protein kinase SK5 ; ligands: CA ; SOLUTION NMR
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.
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
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