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Glycoside hydrolase family 67 : ウィキペディア英語版
Glycoside hydrolase family 67

In molecular biology, glycoside hydrolase family 67 is a family of glycoside hydrolases.
Glycoside hydrolases 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.〔(Bairoch, A. "Classification of glycosyl hydrolase families and index of glycosyl hydrolase entries in SWISS-PROT". 1999. )〕 This classification is available on the CAZy(http://www.cazy.org/GH1.html) web site,〔(Henrissat, B. and Coutinho P.M. "Carbohydrate-Active Enzymes server". 1999. )〕 and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes.〔(CAZypedia, an online encyclopedia of carbohydrate-active enzymes. )〕
Glycoside hydrolase family 67 includes alpha-glucuronidases, these are components of an ensemble of enzymes central to the recycling of photosynthetic biomass, remove the alpha-1,2 linked 4-O-methyl glucuronic acid from xylans.
Members of this family consist of three structural domains. Deletion mutants of alpha-glucuronidase from ''Bacillus stearothermophilus'' have indicated that the central region is responsible for the catalytic activity. Within this central domain, the invariant Glu and Asp (residues 391 and 364 respectively from ''Bacillus stearothermophilus'') are thought to from the catalytic centre. The C-terminal region of alpha-glucuronidase is mainly alpha-helical. It wraps around the catalytic domain, making additional interactions both with the N-terminal domain of its parent monomer and also forming the majority of the dimer-surface with the equivalent C-terminal domain of the other monomer of the dimer.
==References==



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