Crocetin glucosyltransferase involved in the synthesis of crocin, one of the apocarotenoids responsible for the color and bitter taste of saffron. crocetin + UDP-alpha-D-glucose = beta-D-glucosyl crocetin + UDP beta-D-glucosyl crocetin + UDP-alpha-D-glucose = bis(beta-D-glucosyl) crocetin + UDP beta-D-gentiobiosyl crocetin + UDP-alpha-D-glucose = beta-D-gentiobiosyl beta-D-glucosyl crocetin + UDP These parameters were determined on purified activity containing a mix of 2 enzymes, probably GLT2 and GLT3. Mainly expressed in fully developed stigmas. Belongs to the UDP-glycosyltransferase family.