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
looks like an elaborated ferredoxin
contains a HTH motif
Representatives:
e1nkiA1[A:1-56] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
probable fosfomycin resistance protein ; ligands: MN,PPF ; X-RAY DIFFRACTION 0.95Å
e1nkiA2[A:57-134] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
probable fosfomycin resistance protein ; ligands: K,MN,PPF ; X-RAY DIFFRACTION 0.95Å
e1kw3B3[B:133-203] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2,3-Dihydroxybiphenyl dioxygenase ; ligands: FE2 ; X-RAY DIFFRACTION 1.45Å
e1kw3B4[B:204-288] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2,3-Dihydroxybiphenyl dioxygenase ; ligands: FE2,MPD ; X-RAY DIFFRACTION 1.45Å
e1f1uA4[A:208-323] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HOMOPROTOCATECHUATE 2,3-DIOXYGENASE ; ligands: MN ; X-RAY DIFFRACTION 1.5Å
e1xrkA1[A:2-55] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Bleomycin resistance protein ; ligands: BLM ; X-RAY DIFFRACTION 1.5Å
e1kllA1[A:3-66] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
mitomycin-binding protein ; ligands: MC ; X-RAY DIFFRACTION 1.50Å
e1kllA2[A:67-130] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
mitomycin-binding protein ; X-RAY DIFFRACTION 1.50Å
e1f9zA1[A:1-65] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GLYOXALASE I ; ligands: NI ; X-RAY DIFFRACTION 1.500Å
e1f9zA2[A:66-134] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GLYOXALASE I ; ligands: NI ; X-RAY DIFFRACTION 1.500Å
e1zswA1[A:1-71] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Glyoxalase family protein ; ligands: BME,ZN ; X-RAY DIFFRACTION 1.65Å
e1qipA1[A:8-113] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PROTEIN (LACTOYLGLUTATHIONE LYASE) ; ligands: BME,GNB,ZN ; X-RAY DIFFRACTION 1.72Å
e1qipA2[A:114-183] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PROTEIN (LACTOYLGLUTATHIONE LYASE) ; ligands: GNB,ZN ; X-RAY DIFFRACTION 1.72Å
e2pjsA2[A:56-115] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
UNCHARACTERIZED PROTEIN ATU1953 ; X-RAY DIFFRACTION 1.85Å
e1jc4A1[A:3-73] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Methylmalonyl-CoA epimerase ; ligands: SO4 ; X-RAY DIFFRACTION 1.99Å
e1sqiA3[A:8-78] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
4-hydroxyphenylpyruvic acid dioxygenase ; X-RAY DIFFRACTION 2.15Å
e2i7rA2[A:56-115] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Conserved domain protein ; X-RAY DIFFRACTION 2.200Å
e1q0oA3[A:148-207] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
homoprotocatechuate 2,3-dioxygenase ; ligands: FE ; X-RAY DIFFRACTION 2.3Å
e1q0oA4[A:208-359] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
homoprotocatechuate 2,3-dioxygenase ; ligands: FE ; X-RAY DIFFRACTION 2.3Å
e1cjxA3[A:154-223] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
4-HYDROXYPHENYLPYRUVATE DIOXYGENASE ; ligands: ACT,FE2 ; X-RAY DIFFRACTION 2.40Å
e1cjxA4[A:224-356] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
4-HYDROXYPHENYLPYRUVATE DIOXYGENASE ; ligands: ACT,FE2 ; X-RAY DIFFRACTION 2.40Å
e1mpyA3[A:146-207] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CATECHOL 2,3-DIOXYGENASE ; ligands: ACN,FE2 ; X-RAY DIFFRACTION 2.8Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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