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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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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: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

X: ssDNA-binding transcriptional regulator domain-like
H: ssDNA-binding transcriptional regulator domain
T: ssDNA-binding transcriptional regulator domain
F: PnpCD_PnpD_N

PF18191

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