Involved in the biosynthesis of isoflavonoids. Specific for UDP-glucose. Can use genistein > daidzein > formononetin > quercetin > kaempferol > 4,2',4',6'-tetrahydroxychalcone > apigenin > aureusidin > esculetin > naringenin as substrates, but not cyanidin, trans-p-coumaric acid, caffeic acid, benzoic acid, m- and p-hydroxybenzoic acids, salicylic acid, salicyl alcohol, and hydroquinone. a 7-hydroxyisoflavone + UDP-alpha-D-glucose = a 7-hydroxyisoflavone 7-O-beta-D-glucoside + H(+) + UDP kcat is 0.74 sec(-1)for genistein (at pH 8.5 and 30 degrees Celsius). Optimum pH is 8.5. Optimum temperature is 45 degrees Celsius. Monomer. Expressed in shoots, leaves, cotyledons, epicotyls, hypocotyls, roots, pods, seeds and flowers. Belongs to the UDP-glycosyltransferase family.