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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: P-loop domains-like
H: P-loop domains-related
T: Pyruvate-ferredoxin oxidoreductase, PFOR, domain III
F: POR

PF01558

Representatives:

e5b46A1[A:2-226] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-oxoacid--ferredoxin oxidoreductase alpha subunit ; ligands: SF4 ; X-RAY DIFFRACTION 2.10Å

e5b47A3[A:2-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-oxoacid--ferredoxin oxidoreductase alpha subunit ; ligands: PYR,SF4 ; X-RAY DIFFRACTION 2.20Å

e5b48A3[A:1-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-oxoacid--ferredoxin oxidoreductase alpha subunit ; X-RAY DIFFRACTION 2.50Å

e5b48C2[C:2-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-oxoacid--ferredoxin oxidoreductase alpha subunit ; X-RAY DIFFRACTION 2.50Å

e6n2nA3[A:2-198] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pyruvate flavodoxin/ferredoxin oxidoreductase domain protein ; ligands: SF4,SO4 ; X-RAY DIFFRACTION 1.937Å

e3on3A1[A:4-180] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

KETO/OXOACID FERREDOXIN OXIDOREDUCTASE, GAMMA SUBUNIT ; ligands: SO4 ; X-RAY DIFFRACTION 2.19Å

e5c4iE1[E:2-235] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Oxalate oxidoreductase subunit delta ; ligands: SF4 ; X-RAY DIFFRACTION 2.270Å

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