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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

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

X: Chorismate lyase
H: Chorismate lyase
T: Chorismate lyase
F: UTRA

PF07702 CL0122

Representatives:

e2fa1A1[A:84-241] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable transcriptional regulator phnF ; X-RAY DIFFRACTION 1.7Å

e2ikkA1[A:86-238] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL TRANSCRIPTIONAL REGULATOR YURK ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e2pkhA1[A:109-249] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HISTIDINE UTILIZATION REPRESSOR ; ligands: EDO ; X-RAY DIFFRACTION 1.95Å

e3cnvA1[A:98-259] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Putative GntR-family transcriptional regulator ; ligands: CL,FLC ; X-RAY DIFFRACTION 2.00Å

e3bwgA2[A:89-233] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED HTH-TYPE TRANSCRIPTIONAL REGULATOR YYDK ; ligands: EDO ; X-RAY DIFFRACTION 2.09Å

e2p19A1[A:2-149] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Transcriptional regulator ; X-RAY DIFFRACTION 2.1Å

e2ra5A1[A:66-72,A:103-245] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PUTATIVE TRANSCRIPTIONAL REGULATOR ; ligands: IPA,SRT ; X-RAY DIFFRACTION 2.4Å

e2oggA1[A:95-238] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TREHALOSE OPERON TRANSCRIPTIONAL REPRESSOR ; ligands: GOL,NA,SO4 ; X-RAY DIFFRACTION 2.5Å

e2ooiA1[A:73-233] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

SA0254 PROTEIN ; ligands: ZN ; X-RAY DIFFRACTION 2.6Å

e3ddvA1[A:3-60,A:83-145] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Transcriptional regulator (GntR family) ; ligands: MG ; X-RAY DIFFRACTION 2.65Å

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

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