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Glycoside hydrolasesEC3.2.1. are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A classification system for glycoside hydrolases, based on sequence similarity, has led to the definition of >100 different families. This classification is available on the CAZy web site, and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.
Glycoside hydrolase family 97 (GH97) is a bacterial family. The central part of the GH97 family protein sequences represents a typical and complete (beta/alpha)8-barrel or catalyticTIM-barrel type domain. The N- and C-terminal parts of the sequences, mainly consisting of beta-strands, most probably form two additional non-catalytic domains with as yet unknown functions. The non-catalytic domains of glycosidases from the alpha-galactosidase and alpha-glucosidase superfamilies are also predominantly composed of beta-strands, and at least some of these domains are involved in oligomerisation and carbohydrate binding. In all known glycosidases with the (beta-alpha)8-barrel fold, the amino acidresidues at the active site are located on the C-termini of the beta-strands.
