Component of the dammarane-type triterpene saponins (e.g. ginsenosides or panaxosides) biosynthetic pathway (PubMed:26032089, PubMed:29378087). Glycosyltransferase that catalyzes the biosynthesis of ginsenoside F1 from protopanaxatriol (PPT) (PubMed:26032089). Triggers C20-OH glycosylation of ginsenoside Rg3 to produce ginsenoside Rd (PubMed:26032089). Mediates the conversion of protopanaxadiol (PPD) to the ginsenoside compound K (PubMed:24603359, PubMed:26032089). catalyzes the production of 20S-O-beta-(D-glucosyl)-dammarenediol II form dammarenediol II (DM) (PubMed:24603359). (20S)-protopanaxadiol + UDP-alpha-D-glucose = (20S)-ginsenoside C-K + H(+) + UDP (20S)-ginsenoside Rg3 + UDP-alpha-D-glucose = (20S)-ginsenoside Rd + H(+) + UDP (20S)-ginsenoside Rh2 + UDP-alpha-D-glucose = (20S)-ginsenoside F2 + H(+) + UDP (20S)-protopanaxatriol + UDP-alpha-D-glucose = (20S)-ginsenoside F1 + H(+) + UDP dammarenediol-II + UDP-alpha-D-glucose = (20S)-20-O-(beta-D-glucosyl)-3-hydroxydammarene + H(+) + UDP kcat is 9.4 sec(-1) with protopanaxadiol as substrate (PubMed:24603359). kcat is 12.7 sec(-1) with dammarenediol II as substrate (PubMed:24603359). Secondary metabolite biosynthesis; terpenoid biosynthesis. Mostly expressed in leaves and flowers, and, to a lower extent, in roots and stems. Belongs to the UDP-glycosyltransferase family.