Identification of UGT84A13 as a candidate enzyme for the first committed step of gallotannin biosynthesis in pedunculate oak (Quercus robur)

From gallotannin-producing tissues of pedunculate oak (Quercus robur) a cDNA was isolated encoding the glucosyltransferase UGT84A13. The enzyme catalyzed the formation of 1-O-β-d-glucose esters with hydroxybenzoic acids as preferred glucosyl acceptor including gallic acid as the predicted native substrate.