Beta-glucogallin O-galloyltransferase () is an enzyme that catalyzes the chemical reaction
The enzyme has one substrate, glucogallin. Two units of this are converted to one of 1,6-digalloylglucose and one of D-glucose. The product 1,6-digalloylglucose can react with another unit of glucogallin to give 1,2,6-trigalloylglucose.
This enzyme, characterised from oak leaves, belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is 1-O-galloyl-beta-D-glucose:1-O-galloyl-beta-D-glucose O-galloyltransferase.
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