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In an attempt to distinguish between the UDP-glucose: flavonol 3-O-glucosyltransferase (3GT) and the UDP-glucose: anthocyanidin 3-O-glucosyltransferase in flower buds of Petunia hybrida, several properties of these activities were determined. The 3-glucosylation of anthocyanidin had a pH-activity optimum of 7.2, that of flavonol pH 9.2 to 9.5. Anthocyanidin 3GT activity was lowered in the presence of EDTA or β-mercaptoethanol, but this was due to an effect on the anthocyanidin substrate. The two 3-glucosylating activities were to a similar extent inhibited by an increasing ionic strength in the enzyme assay and showed an identical iso-electric point (5.2) as determined by chromatofocusing. Molecular weights were identical: 26000, 52000 or 78000 daltons as determined by gel-filtration. Antiserum raised against partially purified 3GT gave identical immunoprecipitation curves with flavonol 3GT and anthocyanidin 3GT.

Common Identity of UDP-Glucose: Anthocyanidin 3-O-Glucosyltransferase and UDP-Glucose: Flavonol 3-O-Glucosyltransferase in Flowers of Petunia hybrida