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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: Rossmann-like
H: Rossmann-related
T: NagB/RpiA/CoA transferase-like
F: IF-2B

PF01008 CL0063

Representatives:

e1w2w.1[A:150-211,B:221-411] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

5-METHYLTHIORIBOSE-1-PHOSPHATE ISOMERASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.750Å

e1t5oA1[A:132-341] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Translation initiation factor eIF2B, subunit delta ; X-RAY DIFFRACTION 1.9Å

e2a0uA1[A:158-383] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

INITIATION FACTOR 2B ; ligands: SO4 ; X-RAY DIFFRACTION 2.1Å

e1vb5A1[A:95-275] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

translation initiation factor eIF-2B ; X-RAY DIFFRACTION 2.2Å

e4zeoA1[A:268-399,A:424-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Translation initiation factor eif-2b-like protein ; X-RAY DIFFRACTION 2.550Å

e5b04A1[A:120-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Translation initiation factor eIF-2B subunit alpha ; ligands: PO4 ; X-RAY DIFFRACTION 2.99Å

e5b04C1[C:191-393] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable translation initiation factor eIF-2B subunit beta ; ligands: PO4 ; X-RAY DIFFRACTION 2.99Å

e5b04G1[G:252-462] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable translation initiation factor eIF-2B subunit delta ; ligands: PO4 ; X-RAY DIFFRACTION 2.99Å

e5b04D1[D:190-393] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable translation initiation factor eIF-2B subunit beta ; ligands: PO4 ; X-RAY DIFFRACTION 2.99Å

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