Glucosyltransferase involved in the glucosylation of the steroidal alkaloid aglycons solanidine, solasodine and tomatidine to produce their corresponding glycoalkaloids. solasodine + UDP-alpha-D-glucose = H(+) + solasodine 3-beta-D-glucoside + UDP solanidine + UDP-alpha-D-glucose = H(+) + solanidine 3-O-beta-D-glucopyranoside + UDP tomatidine + UDP-alpha-D-glucose = H(+) + tomatidine 3-O-beta-D-glucopyranoside + UDP Expressed in the shoot apical meristem (SAM) and tuber. Induced by wounding. Belongs to the UDP-glycosyltransferase family.