Structure and activity of a flavonoid 3-O-glucosyltransferase reveals the basis for plant natural product modification

Offen, W., Martinez-Fleites, C., Yang, M., Eng, K-L., Davis, B.G. and Davies, G.J. (2006) Structure and activity of a flavonoid 3-O-glucosyltransferase reveals the basis for plant natural product modification. EMBO Journal, 25 (6). pp. 1396-1405. 10.1038/sj.emboj.7600970 .

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DOI: 10.1038/sj.emboj.7600970

Abstract

Glycosylation is a key mechanism for orchestrating the bioactivity, metabolism and location of small molecules in living cells. In plants, a large multigene family of glycosyltransferases is involved in these processes, conjugating hormones, secondary metabolites, biotic and abiotic environmental toxins, to impact directly on cellular homeostasis. The red grape enzyme UDP-glucose:flavonoid 3-O-glycosyltransferase (VvGT1) is responsible for the formation of anthocyanins, the health-promoting compounds which, in planta, function as colourants determining flower and fruit colour and are precursors for the formation of pigmented polymers in red wine. We show that VvGT1 is active, in vitro, on a range of flavonoids. VvGT1 is somewhat promiscuous with respect to donor sugar specificity as dissected through full kinetics on a panel of nine sugar donors. The three-dimensional structure of VvGT1 has also been determined, both in its 'Michaelis' complex with a UDP-glucose-derived donor and the acceptor kaempferol and in complex with UDP and quercetin. These structures, in tandem with kinetic dissection of activity, provide the foundation for understanding the mechanism of these enzymes in small molecule homeostasis.

Item Type:Article
Additional Information:Full text available electronically from the School of Pharmacy Library.
Departments, units and centres:Department of Pharmaceutical and Biological Chemistry > Department of Pharmaceutical and Biological Chemistry
ID Code:917
Journal or Publication Title:EMBO Journal
Deposited By:Library Staff
Deposited On:14 May 2008 15:56
Last Modified:07 Oct 2011 15:43

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