In enzymology, a beta-glucogallin-tetrakisgalloylglucose O-galloyltransferase is an enzyme that catalyzes the chemical reaction.1-O-galloyl-β-D-glucose + 1,2,3,6-tetrakis-O-galloyl-β-D-glucose D-glucose + 1,2,3,4,6-pentakis-O-galloyl-beta-D-glucose