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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

X: alpha/beta-Hammerhead/Barrel-sandwich hybrid
H: alpha/beta-Hammerhead/Barrel-sandwich hybrid
T: CO dehydrogenase molybdoprotein N-domain-like
F: Ald_Xan_dh_C

PF01315

Representatives:

e1n62B2[B:6-146] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Carbon monoxide dehydrogenase large chain ; X-RAY DIFFRACTION 1.09Å

e1vlbA4[A:194-310] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ALDEHYDE OXIDOREDUCTASE ; X-RAY DIFFRACTION 1.28Å

e1rm6A2[A:9-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

4-HYDROXYBENZOYL-COA REDUCTASE ALPHA SUBUNIT ; ligands: NA ; X-RAY DIFFRACTION 1.6Å

e1t3qB2[B:1-165] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

quinoline 2-oxidoreductase large subunit ; ligands: SO4 ; X-RAY DIFFRACTION 1.80Å

e1v97A6[A:537-694] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XANTHINE DEHYDROGENASE ; ligands: FYX,GOL ; X-RAY DIFFRACTION 1.94Å

e7opnA4[A:543-703] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aldehyde oxidase ; ligands: RAL ; X-RAY DIFFRACTION 2.60Å

e7opnB4[B:543-703] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aldehyde oxidase ; ligands: RAL ; X-RAY DIFFRACTION 2.60Å

e7orcA3[A:543-703] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aldehyde oxidase ; ligands: MLI,RAL ; X-RAY DIFFRACTION 2.70Å

e7orcB4[B:543-703] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aldehyde oxidase ; ligands: MLI,RAL ; X-RAY DIFFRACTION 2.70Å

e7d6oA4[A:529-694] Image Pymol Jmol Links: PDB, SCOP, CATH

e7d6oB4[B:529-694] Image Pymol Jmol Links: PDB, SCOP, CATH

e7dnvA4[A:529-694] Image Pymol Jmol Links: PDB, SCOP, CATH

e7dnvB4[B:529-694] Image Pymol Jmol Links: PDB, SCOP, CATH

e1jroB2[B:2-123] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

xanthine dehydrogenase, chain B ; X-RAY DIFFRACTION 2.70Å

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 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