PROSITE documentation PDOC00910

Glycosyl hydrolases family 35 putative active site




Description

β-galactosidases (EC 3.2.1.23) from mammals, fungi, plants and the bacteria Xanthomonas manihotis are evolutionary related [1,2]. They belong to family 35 in the classification of glycosyl hydrolases [3,E1].

Mammalian β-galactosidase is a lysosomal enzyme (gene GLB1) which cleaves the terminal galactose from gangliosides, glycoproteins, and glycosaminoglycans and whose deficiency is the cause of the genetic disease Gm(1) gangliosidosis (Morquio disease type B).

On of the best conserved regions in these enzymes contains a glutamic acid residue which, on the basis of similarities with other families of glycosyl hydrolases [4], probably acts as the proton donor in the catalytic mechanism. We use this region as a signature pattern.

Expert(s) to contact by email:

Henrissat B.

Last update:

May 2004 / Text revised.

Technical section

PROSITE method (with tools and information) covered by this documentation:

GLYCOSYL_HYDROL_F35, PS01182; Glycosyl hydrolases family 35 putative active site  (PATTERN)


References

1AuthorsTaron C.H., Benner J.S., Hornstra L.J., Guthrie E.P.
TitleA novel beta-galactosidase gene isolated from the bacterium Xanthomonas manihotis exhibits strong homology to several eukaryotic beta-galactosidases.
SourceGlycobiology 5:603-610(1995).
PubMed ID8563148

2AuthorsCarey A.T., Holt K., Picard S., Wilde R., Tucker G.A., Bird C.R., Schuch W., Seymour G.B.
TitleTomato exo-(1-->4)-beta-D-galactanase. Isolation, changes during ripening in normal and mutant tomato fruit, and characterization of a related cDNA clone.
SourcePlant Physiol. 108:1099-1107(1995).
PubMed ID7630937

3AuthorsHenrissat B., Bairoch A.
TitleNew families in the classification of glycosyl hydrolases based on amino acid sequence similarities.
SourceBiochem. J. 293:781-788(1993).
PubMed ID8352747

4AuthorsHenrissat B., Callebaut I., Fabrega S., Lehn P., Mornon J.-P., Davies G.
TitleConserved catalytic machinery and the prediction of a common fold for several families of glycosyl hydrolases.
SourceProc. Natl. Acad. Sci. U.S.A. 92:7090-7094(1995).
PubMed ID7624375

E1Sourcehttp://www.uniprot.org/docs/glycosid



PROSITE is copyright. It is produced by the SIB Swiss Institute Bioinformatics. There are no restrictions on its use by non-profit institutions as long as its content is in no way modified. Usage by and for commercial entities requires a license agreement. For information about the licensing scheme send an email to
Prosite License or see: prosite_license.html.

Miscellaneous

View entry in original PROSITE document format
View entry in raw text format (no links)