Home Help

X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

Keyword search

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: 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:

e1jx6A3[A:27-178,A:312-364] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LUXP PROTEIN ; ligands: AI2,CA ; X-RAY DIFFRACTION 1.5Å

e1jyeA3[A:62-161,A:292-332] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Lactose Operon Repressor ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å

e3rotA2[A:129-264] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

ABC SUGAR TRANSPORTER, PERIPLASMIC SUGAR BINDING PROTEIN ; ligands: GOL ; X-RAY DIFFRACTION 1.91Å

e5wb4F2[F:2-86] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

N-acetylglucosaminyldiphosphoundecaprenol N-acetyl-beta-D-mannosaminyltransferase ; ligands: SO4 ; X-RAY DIFFRACTION 2.000Å

e3edcA2[A:61-160,A:292-360] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LACTOSE OPERON REPRESSOR ; ligands: HEZ ; X-RAY DIFFRACTION 2.1Å

e5er3A1[A:47-137,A:309-364] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Sugar ABC transporter, periplasmic sugar-binding protein ; ligands: CA ; X-RAY DIFFRACTION 2.100Å

e4xxhA1[A:61-158,A:283-315] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator TreR ; ligands: T6P ; X-RAY DIFFRACTION 2.400Å

e4tlmB2[B:26-142,B:281-388] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

receptor subunit GluN2B ; ligands: NAG,QEM ; X-RAY DIFFRACTION 3.77Å

e4pe5B1[B:30-147,B:286-394] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate receptor ionotropic, NMDA 2B ; ligands: GLU,GLY,NAG,QEL ; X-RAY DIFFRACTION 3.950Å

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