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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

X: jelly-roll
H: Galactose-binding domain-like
T: Galactose-binding domain-like
F: CBM_6

PF03422 CL0202

Representatives:

e1w0nA1[A:12-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-XYLANASE D ; ligands: CA,MG,SO4 ; X-RAY DIFFRACTION 0.800Å

e1od3A1[A:19-150] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE XYLANASE ; ligands: ACY,CA ; X-RAY DIFFRACTION 1.0Å

e1uxzA1[A:1-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CELLULASE B ; X-RAY DIFFRACTION 1.4Å

e1w9sA1[A:7-140] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BH0236 PROTEIN ; ligands: GOL,NA ; X-RAY DIFFRACTION 1.59Å

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.

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

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