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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: Flavodoxin-like
H: Class I glutamine amidotransferase-like
T: Chelatase-like
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.

Representatives:

e2etvA2[A:176-358] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

iron(III) ABC transporter, periplasmic iron-binding protein, putative ; ligands: CL,EDO ; X-RAY DIFFRACTION 1.7Å

e3r5sA2[A:178-330] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERRIC VIBRIOBACTIN ABC TRANSPORTER, PERIPLASMIC FERRIC VIBRIOBACTIN-BINDING PROTEIN ; X-RAY DIFFRACTION 1.79Å

e1n2zA2[A:139-266] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Vitamin B12 transport protein btuF ; ligands: CD,CL,CNC ; X-RAY DIFFRACTION 2Å

e3aekA3[A:167-277] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light-independent protochlorophyllide reductase subunit N ; X-RAY DIFFRACTION 2.300Å

e5ggxA2[A:183-317] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Iron(III) ABC transporter, periplasmic iron-compound-binding protein ; ligands: DEF ; X-RAY DIFFRACTION 3.40Å

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