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
X: Thymidylate synthase/dCMP hydroxymethylase
H: Thymidylate synthase/dCMP hydroxymethylase
T: Thymidylate synthase/dCMP hydroxymethylase
F: Thymidylat_synt
Representatives:
e1b5eA1[A:1-241]
nonrep
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Pymol
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PROTEIN (DEOXYCYTIDYLATE HYDROXYMETHYLASE) ; ligands: DCM ; X-RAY DIFFRACTION 1.6Å
e1bkpA1[A:2-279]
nonrep
Image
Pymol
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THYMIDYLATE SYNTHASE A ; X-RAY DIFFRACTION 1.7Å
e3nrrA2[A:195-511]
nonrep
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Pymol
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Dihydrofolate reductase-thymidylate synthase ; ligands: CL,D16,EDO,GOL,UMP ; X-RAY DIFFRACTION 1.800Å
e5jnhB1[B:3-329]
nonrep
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Pymol
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CMP 5-hydroxymethylase ; X-RAY DIFFRACTION 2.200Å
e1bo7A1[A:1-316]
nonrep
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PROTEIN (THYMIDYLATE SYNTHASE) ; ligands: U ; X-RAY DIFFRACTION 2.4Å
e4o7uB1[B:1-315]
nonrep
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Pymol
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Thymidylate synthase ; ligands: EDO,SO4,THF ; X-RAY DIFFRACTION 2.40Å
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