Broad spectrum multifunctional glucosyltransferase. Catalyzes the formation of flavonol 3-O-glucosides during fruit ripening. Accepted substrates include several flavonoids, hydroxycoumarins and beta-naphthols. Uses UDP-Glc as a sugar donor, but not UDP-Gal or UDP-GlcUA. May also be involved in detoxification of xenobiotics. a flavonol + UDP-alpha-D-glucose = a flavonol 3-O-beta-D-glucoside + H(+) + UDP The kinetic constants are determined for the recombinant GST-fusion protein. Optimum pH is 7.5-8. Optimum temperature is 35 degrees Celsius. Strongly expressed in achenes, with lower expression levels detected in receptacles. The expression in receptacles is ripening-related, with highest expression detected in red fruit. By de-achening. By injection with salicylic acid, with transcript levels increasing by a factor of 5-6 at 4 hours post-injection, remaining stable until 6 hours post-injection and falling below control levels at 8 hours post-injection. Down-regulated by synthetic auxin naphthaleneacetic acid (NAA). Belongs to the UDP-glycosyltransferase family.