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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

X: HLH-like
H: HLH, helix-loop-helix DNA-binding domain
T: HLH, helix-loop-helix DNA-binding domain
F: bZIP_1

PF00170 CL0018

Representatives:

e6mg1A1[A:269-338] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CCAAT/enhancer-binding protein beta ; ligands: EDO ; X-RAY DIFFRACTION 1.63Å

Domain assembly:

e5vpeA1[A:152-218] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein fosB , X-RAY DIFFRACTION 2.060Å

e5vpeB1[B:265-331] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein fosB , X-RAY DIFFRACTION 2.060Å

Domain assembly:

e5vpeB1[B:265-331] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription factor jun-D , X-RAY DIFFRACTION 2.060Å

e5vpeA1[A:152-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcription factor jun-D , X-RAY DIFFRACTION 2.060Å

e5zkoA1[A:285-337] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cyclic AMP-responsive element-binding protein 1 ; X-RAY DIFFRACTION 3.05Å

e5zk1A1[A:285-337] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cyclic AMP-responsive element-binding protein 1 ; X-RAY DIFFRACTION 3.050Å

e6iakA1[A:210-277] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Uncharacterized protein ; X-RAY DIFFRACTION 3.95Å

e6iakF1[F:205-275] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Uncharacterized protein ; X-RAY DIFFRACTION 3.95Å

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.

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

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