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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

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: a/b domain in Acetophenone carboxylase (Apc) alpha subunit
H: a/b domain in Acetophenone carboxylase (Apc) alpha subunit
T: a/b domain in Acetophenone carboxylase (Apc) alpha subunit
F: Hydant_A_N

PF05378 CL0108

Representatives:

e5l9wB3[B:89-236] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetophenone carboxylase gamma subunit ; ligands: EPE ; X-RAY DIFFRACTION 2.9Å

e5m45B2[B:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; ligands: ACT ; X-RAY DIFFRACTION 1.87Å

e5m45E1[E:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; ligands: ACT ; X-RAY DIFFRACTION 1.87Å

e5m45H4[H:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; ligands: ACT ; X-RAY DIFFRACTION 1.87Å

e5m45K5[K:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; ligands: ACT ; X-RAY DIFFRACTION 1.87Å

e5svbB3[B:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; X-RAY DIFFRACTION 2.645Å

e5svbE1[E:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; X-RAY DIFFRACTION 2.645Å

e5svcB1[B:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; X-RAY DIFFRACTION 2.7Å

e5svcE2[E:91-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Acetone carboxylase beta subunit ; X-RAY DIFFRACTION 2.7Å

e6yraA5[A:85-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

5-oxoprolinase ; X-RAY DIFFRACTION 4.000Å

e6yraC2[C:85-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

5-oxoprolinase ; X-RAY DIFFRACTION 4.000Å

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.

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