The term glycoside hydrolase (GH) (alternatively, glycosidase) formally refers to enzymes that catalyze the hydrolytic cleavage of the glycosidic bond to give the carbohydrate hemiacetal. Detailed explanations of the distinct catalytic mechanisms employed by these enzymes can be found on the glycoside hydrolase lexicon page. Since the seminal sequence-based classification of GHs into families, it has subsequently been observed that some of these families also group non-hydrolytic enzymes and proteins, due to sequence and structural similarity [1, 2, 3, 4, 5, 6, 7, 8, 9]. In many cases, these alternative activities bear some degree of mechanistic similarity (e.g., conserved catalytic residues or enzyme intermediates) to the eponymous enzymes:
Transglycosylases are mechanistically related to retainingglycoside hydrolases, with the exception that a sugar (or another nucleophile), rather than water, acts as the acceptor substrate to yield glycosidic bond exchange.
Alpha-glucan lyases are found within family GH31 and degrade α-(1-4)-linked glucans (e.g. starch) and oligosaccharides via an elimination mechanism that yields an enol (unsaturated) product that tautomerises to its keto form, 1,5-anhydro fructose.
These pages have been approved by the Responsible Curator as essentially complete. CAZypedia is a living document, so further improvement of these pages is still possible; please see the individual pages for more information.
There are currently 144 Curator approved Glycoside Hydrolase (GH) Family pages in CAZypedia.
These pages are currently under construction in CAZypedia. As such, the Responsible Curator has deemed that the page's content is not quite up to CAZypedia's standards for full public consumption. All information on these pages should therefore be considered to be under revision and may be subject to major changes.
There are currently 10 Glycoside Hydrolase Family pages under construction in CAZypedia.
The following Unassigned pages are currently lacking a Responsible Curator and one or more Authors. If you are an expert on any of these families and would like to help us improve CAZypedia by getting involved with the production and maintenance of the corresponding page(s), please contact a member of the Board of Curators. Undergraduate students, (post)graduate students, post-doctoral researchers, research associates, and professors are all welcomed to contribute!
There are currently 40 Glycoside Hydrolase Family pages in CAZypedia that have not been assigned to a Responsible Curator.
The following families have been deleted from the CAZy database. Please see the individual CAZypedia pages and links to the corresponding CAZy DB pages for specific explanations.
There are currently 8 pages in CAZypedia that describe Glycoside Hydrolase families deleted from the CAZy DB.
Davies, G.J. and Sinnott, M.L. (2008) Sorting the diverse: the sequence-based classifications of carbohydrate-active enzymes. The Biochemist, vol. 30, no. 4., pp. 26-32. DOI:10.1042/BIO03004026. [DaviesSinnott2008]
