Beta-glucogallin—tetrakisgalloylglucose O-galloyltransferase

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In enzymology, a beta-glucogallin-tetrakisgalloylglucose O-galloyltransferase (EC 2.3.1.143) is an enzyme that catalyzes the chemical reaction.

1-O-galloyl-beta-D-glucose + 1,2,3,6-tetrakis-O-galloyl-beta-D-glucose ${\displaystyle \rightleftharpoons }$ D-glucose + 1,2,3,4,6-pentakis-O-galloyl-beta-D-glucose

Thus, the two substrates of this enzyme are 1-O-galloyl-beta-D-glucose and 1,2,3,6-tetrakis-O-galloyl-beta-D-glucose, whereas its two products are D-glucose and 1,2,3,4,6-pentakis-O-galloyl-beta-D-glucose.

This enzyme 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:1,2,3,6-tetrakis-O-galloyl-beta-D-glucose 4-O-galloyltransferase. Other names in common use include beta-glucogallin-tetragalloylglucose 4-galloyltransferase, beta-glucogallin:1,2,3,6-tetra-O-galloylglucose, 4-O-galloyltransferase, beta-glucogallin:1,2,3,6-tetra-O-galloyl-beta-D-glucose, and 4-O-galloyltransferase.

• Cammann J, Denzel K, Schilling G, Gross GG (1989). "Biosynthesis of gallotannins: beta-glucogallin-dependent formation of 1,2,3,4,6-pentagalloylglucose by enzymatic galloylation of 1,2,3,6-tetragalloylglucose". Arch. Biochem. Biophys. 273 (1): 58–63. doi:10.1016/0003-9861(89)90161-6. PMID 2757399.