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: Rossmann-like
H: Rossmann-related
T: S-adenosyl-L-methionine-dependent methyltransferases
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:
e3dmfA2[A:3-195]
* nonrep
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Probable ribosomal RNA small subunit methyltransferase ; ligands: SAM,SO4 ; X-RAY DIFFRACTION 1.58Å
e3ll7A2[A:68-279]
nonrep
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Pymol
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Putative methyltransferase ; ligands: EDO,FMT ; X-RAY DIFFRACTION 1.8Å
e3orhA1[A:7-236]
nonrep
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GUANIDINOACETATE N-METHYLTRANSFERASE ; ligands: SAH ; X-RAY DIFFRACTION 1.86Å
e5x6yB4[B:269-358,B:380-429,B:451-453]
* nonrep
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mRNA capping enzyme P5 ; X-RAY DIFFRACTION 2.1Å
e3ssmA2[A:161-395]
nonrep
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Methyltransferase ; ligands: MG,SAH ; X-RAY DIFFRACTION 2.247Å
e4dcmA2[A:8-178]
* nonrep
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Ribosomal RNA large subunit methyltransferase G ; X-RAY DIFFRACTION 2.297Å
e3wstA4[A:362-481]
* nonrep
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Protein arginine N-methyltransferase 7 ; X-RAY DIFFRACTION 2.39Å
e6b39A3[A:241-505]
nonrep
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AprA Methyltransferase 1 ; ligands: SAH,SO4 ; X-RAY DIFFRACTION 2.390Å
e2hwkA2[A:607-787]
* nonrep
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helicase nsP2 ; X-RAY DIFFRACTION 2.45Å
e5x71A2[A:258-449]
nonrep
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mRNA capping enzyme P5 ; X-RAY DIFFRACTION 2.55Å
e5x71A3[A:151-255,A:450-613]
nonrep
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mRNA capping enzyme P5 ; X-RAY DIFFRACTION 2.55Å
e6fn6A7[A:1143-1333]
* nonrep
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Fatty acid synthase 1, isoform A ; X-RAY DIFFRACTION 2.7Å
e6irvA3[A:490-668]
nonrep
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Phosphorylated CTD-interacting factor 1 ; X-RAY DIFFRACTION 2.700Å
e4guaA2[A:1155-1347]
nonrep
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NON-STRUCTURAL POLYPROTEIN ; ligands: MES,SO4 ; X-RAY DIFFRACTION 2.85Å
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