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Flavonoid O-Diglucosyltransferase from Rice: Molecular Cloning and Characterization

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Abstract

Among more than 100 rice uridine diphosphate glycosyltransferases (UGTs), OsUGT-3 was selected as a candidate for producing flavonoid O-diglycosyltransferases based on phylogenetic analysis and molecular docking. This gene was functionally expressed in Escherichia coli. Analysis of kaempferol, luteolin, quercetin, and tricin reaction products using liquid chromatography-mass spectrometry revealed that these were diglucosylated. The glucosylation positions of kaempferol, which was the best substrate, were determined to be the 3- and 7-hydroxyl groups. This is the first flavonoid O-diglucosyltransferase described from rice.

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Acknowledgments

This work was supported by a Korea Research Foundation grant funded by the Korean Government (MOEHRD) (KRF-2005-214-00029).

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Correspondence to Joong-Hoon Ahn.

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Kim, BG., Kim, N.Y., Kim, J.H. et al. Flavonoid O-Diglucosyltransferase from Rice: Molecular Cloning and Characterization. J. Plant Biol. 52, 41–48 (2009). https://doi.org/10.1007/s12374-008-9002-x

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  • DOI: https://doi.org/10.1007/s12374-008-9002-x

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