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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: Glycosyl hydrolase domain-like

some similarity with Ig fold

H: Glycosyl hydrolase domain
T: Glycosyl hydrolase domain
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:

e6jyzA2[A:419-488] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative secreted endoglycosylceramidase ; ligands: EDO,IPA ; X-RAY DIFFRACTION 1.2Å

e6sauA1[A:388-459] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

alpha amylase ; ligands: GLC,GLN ; X-RAY DIFFRACTION 1.35Å

e5opqA3[A:626-693] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

3,6-anhydro-D-galactosidase ; X-RAY DIFFRACTION 1.7Å

e2wvvB4[B:383-484] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ALPHA-L-FUCOSIDASE ; ligands: GOL ; X-RAY DIFFRACTION 1.73Å

e5u22A2[A:313-431] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

N2152 ; ligands: IOD ; X-RAY DIFFRACTION 1.748Å

e5e8m.2[B:1-16,A:417-543] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heparanase ; ligands: EDO,FUC,NAG ; X-RAY DIFFRACTION 1.75Å

e5z3kB2[B:352-484] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

glucosidase ; X-RAY DIFFRACTION 1.8Å

e6t7gAAA3[AAA:609-681] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glyco_hydro_42M domain-containing protein ; X-RAY DIFFRACTION 1.8Å

e6s9vA2[A:449-502] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Sucrose 6(F)-phosphate phosphorylase ; ligands: SO4 ; X-RAY DIFFRACTION 1.830Å

e6lgaA2[A:520-606] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Sucrose hydrolase ; X-RAY DIFFRACTION 1.85Å

e5la4A2[A:36-51,A:417-543] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heparanase ; ligands: FUC,NAG ; X-RAY DIFFRACTION 1.90Å

e6a0kA2[A:380-450] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cyclic maltosyl-maltose hydrolase ; X-RAY DIFFRACTION 1.94Å

e5xb7A1[A:614-699] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-galactosidase ; ligands: GOL ; X-RAY DIFFRACTION 2.0Å

e6ptmA3[A:700-775] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Uncharacterized protein ; ligands: EDO ; X-RAY DIFFRACTION 2.00Å

e7qqjA2[A:428-474] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Sucrose phosphorylase ; X-RAY DIFFRACTION 2.05Å

e6s9uA2[A:470-524] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative sucrose phosphorylase ; ligands: B3P ; X-RAY DIFFRACTION 2.050Å

e3k8kA2[A:607-692] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Alpha-amylase, susG ; ligands: ACT,PEG ; X-RAY DIFFRACTION 2.2Å

e6gn6F1[F:336-424] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Alpha-L-fucosidase ; ligands: MAL,P6G ; X-RAY DIFFRACTION 2.200Å

e1hl9A1[A:357-448] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE ALPHA-L-FUCOSIDASE ; X-RAY DIFFRACTION 2.25Å

e5zcrA1[A:660-726] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Maltooligosyl trehalose synthase ; ligands: GOL ; X-RAY DIFFRACTION 2.4Å

e5jvkA3[A:443-525] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Uncharacterized protein ; ligands: CXS,GOL ; X-RAY DIFFRACTION 2.5Å

e1o7dE2[E:899-1007] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Lysosomal alpha-mannosidase ; ligands: SO4 ; X-RAY DIFFRACTION 2.700Å

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