Component of the triterpene saponins (e.g. PPD-type ginsenosides or panaxosides) biosynthetic pathways (PubMed:25320211). Glycosyltransferase that catalyzes the biosynthesis of compound K from protopanaxadiol (PPD) (PubMed:25320211). (20S)-protopanaxadiol + UDP-alpha-D-glucose = (20S)-ginsenoside C-K + H(+) + UDP Secondary metabolite biosynthesis; terpenoid biosynthesis. Induced by methyl jasmonate (MeJA). Belongs to the UDP-glycosyltransferase family.