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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

X: Acyl-CoA dehydrogenase middle domain-like
H: Acyl-CoA dehydrogenase middle domain-like
T: Acyl-CoA dehydrogenase middle domain-like
F: HpaB_N

PF11794

Representatives:

e1u8vA1[A:143-275] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-aminobutyrate metabolism dehydratase/isomerase ; ligands: FAD ; X-RAY DIFFRACTION 1.6Å

e4oo2C2[C:157-287] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chlorophenol-4-monooxygenase ; X-RAY DIFFRACTION 2.63Å

e6b1bB3[B:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase, oxygenase subunit ; X-RAY DIFFRACTION 1.944Å

e6eb0A1[A:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase, oxygenase subunit ; X-RAY DIFFRACTION 2.370Å

e6eb0B1[B:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase, oxygenase subunit ; X-RAY DIFFRACTION 2.370Å

e6eb0C2[C:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase, oxygenase subunit ; X-RAY DIFFRACTION 2.370Å

e6eb0D3[D:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase, oxygenase subunit ; X-RAY DIFFRACTION 2.370Å

e6qyhA2[A:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase oxygenase component ; ligands: PEG ; X-RAY DIFFRACTION 1.94Å

e6qyhB1[B:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase oxygenase component ; X-RAY DIFFRACTION 1.94Å

e6qyiA3[A:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase oxygenase component ; ligands: FAD,PEG ; X-RAY DIFFRACTION 1.80Å

e6qyiB2[B:151-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-hydroxyphenylacetate 3-monooxygenase oxygenase component ; ligands: FAD,PGE ; X-RAY DIFFRACTION 1.80Å

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.

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

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