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:
e4zxaW1[W:16-170] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: H8N ; X-RAY DIFFRACTION 2.488Å
e4zxaX2[X:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: H8N ; X-RAY DIFFRACTION 2.488Å
e4zxaY1[Y:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: H8N ; X-RAY DIFFRACTION 2.488Å
e4zxaZ1[Z:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: H8N ; X-RAY DIFFRACTION 2.488Å
e4zxcW1[W:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 3.050Å
e4zxcZ1[Z:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 3.050Å
e4zxcY1[Y:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 3.050Å
e4zxcX1[X:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 3.050Å
e4zxdW1[W:16-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 3.05Å
e4zxdX2[X:19-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 3.05Å
e5m21D1[D:15-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: PHB ; X-RAY DIFFRACTION 1.990Å
e5m22D2[D:15-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 2.390Å
e5m4oD1[D:15-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: NPO ; X-RAY DIFFRACTION 2.100Å
e5m21B1[B:17-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: PHB ; X-RAY DIFFRACTION 1.990Å
e5m21F1[F:16-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: PHB ; X-RAY DIFFRACTION 1.990Å
e5m21H1[H:9-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: PHB ; X-RAY DIFFRACTION 1.990Å
e5m22B2[B:17-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 2.390Å
e5m22F2[F:16-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 2.390Å
e5m22H1[H:9-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; X-RAY DIFFRACTION 2.390Å
e5m26B1[B:10-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: 7DV ; X-RAY DIFFRACTION 1.900Å
e5m26D1[D:15-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: 7DV ; X-RAY DIFFRACTION 1.900Å
e5m26F1[F:16-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: 7DV ; X-RAY DIFFRACTION 1.900Å
e5m26H2[H:9-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: 7DV ; X-RAY DIFFRACTION 1.900Å
e5m4oB2[B:17-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: NPO ; X-RAY DIFFRACTION 2.100Å
e5m4oF1[F:16-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: NPO ; X-RAY DIFFRACTION 2.100Å
e5m4oH2[H:9-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroquinone dioxygenase large subunit ; ligands: NPO ; X-RAY DIFFRACTION 2.100Å
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