Possesses quercetin 7-O-glucosyltransferase and 4'-O-glucosyltransferase activities in vitro. Also active in vitro on benzoates and benzoate derivatives. Has low affinity for the tryptophan precursor anthranilate. Catalyzes the formation of anthranilate glucose ester. Is a minor source of this activity in the plant. a 7-O-hydroxy-flavonol + UDP-alpha-D-glucose = a flavonol 7-O-beta-D-glucoside + H(+) + UDP A number of isoforms are produced. According to EST sequences. Belongs to the UDP-glycosyltransferase family.