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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: Periplasmic binding protein-like I
F: ABC_sub_bind

PF04392 CL0144

Representatives:

e3lftA1[A:49-164,A:283-343] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized protein ; ligands: TRP ; X-RAY DIFFRACTION 1.350Å

e3lftA2[A:165-282] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized protein ; ligands: TRP ; X-RAY DIFFRACTION 1.350Å

e3lkvA2[A:152-321] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED CONSERVED DOMAIN PROTEIN ; ligands: PHE,ZN ; X-RAY DIFFRACTION 2.2Å

e3lftB1[B:181-343] Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized protein ; ligands: TRP ; X-RAY DIFFRACTION 1.350Å

e5z6vA1[A:27-184] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type uncharacterized transport system periplasmic component-like protein ; X-RAY DIFFRACTION 1.87Å

e6k1xA1[A:27-184] Image Pymol Jmol Links: PDB, SCOP, CATH

ABC-type uncharacterized transport system periplasmic component-like protein ; X-RAY DIFFRACTION 1.80Å

e6hniA1[A:169-338] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type transport system, sugar-family extracellular solute-binding protein ; ligands: EDO,PEG,TYR ; X-RAY DIFFRACTION 1.35Å

e6hnjA1[A:169-339] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type transport system, sugar-family extracellular solute-binding protein ; ligands: EDO,PEG,PGE ; X-RAY DIFFRACTION 1.80Å

e6hnkA2[A:169-338] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type transport system, sugar-family extracellular solute-binding protein ; X-RAY DIFFRACTION 2.50Å

e6k1wA1[A:27-181] Image Pymol Jmol Links: PDB, SCOP, CATH

ABC-type uncharacterized transport system periplasmic component-like protein ; X-RAY DIFFRACTION 1.50Å

e6k1yA1[A:27-181] Image Pymol Jmol Links: PDB, SCOP, CATH

ABC-type uncharacterized transport system periplasmic component-like protein ; X-RAY DIFFRACTION 1.9Å

e8wglA1[A:27-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type uncharacterized transport system periplasmic component-like protein ; ligands: HG ; X-RAY DIFFRACTION 2.3Å

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