Accepted name: cyanidin-3-O-glucoside 2′′-O-glucuronosyltransferase
Reaction: UDP-α-D-glucuronate + cyanidin 3-O-β-D-glucoside = UDP + cyanidin 3-O-(2-O-β-D-glucuronosyl)-β-D-glucoside
Glossary: cyanidin = 3,3′,4′,5,7-pentahydroxyflavylium
Other name(s): BpUGT94B1; UDP-glucuronic acid:anthocyanin glucuronosyltransferase; UDP-glucuronic acid:anthocyanidin 3-glucoside 2′-O-β-glucuronosyltransferase; BpUGAT; UDP-D-glucuronate:cyanidin-3-O-β-glucoside 2-O-β-glucuronosyltransferase
Systematic name: UDP-α-D-glucuronate:cyanidin-3-O-β-D-glucoside 2-O-β-D-glucuronosyltransferase
Comments: The enzyme is highly specific for cyanidin 3-O-glucosides and UDP-α-D-glucuronate. Involved in the production of glucuronosylated anthocyanins that are the origin of the red coloration of flowers of Bellis perennis [1].
1.  Sawada, S., Suzuki, H., Ichimaida, F., Yamaguchi, M.A., Iwashita, T., Fukui, Y., Hemmi, H., Nishino, T. and Nakayama, T. UDP-glucuronic acid:anthocyanin glucuronosyltransferase from red daisy (Bellis perennis) flowers. Enzymology and phylogenetics of a novel glucuronosyltransferase involved in flower pigment biosynthesis. J. Biol. Chem. 280 (2005) 899–906. [PMID: 15509561]
2.  Osmani, S.A., Bak, S., Imberty, A., Olsen, C.E. and Møller, B.L. Catalytic key amino acids and UDP-sugar donor specificity of a plant glucuronosyltransferase, UGT94B1: molecular modeling substantiated by site-specific mutagenesis and biochemical analyses. Plant Physiol. 148 (2008) 1295–1308. [PMID: 18829982]
[EC created 2011]

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