ID 1.1.1.439 DE 17-dehydrostemmadenine reductase. CA 15alpha-stemmadenine + NADP(+) = 17-dehydrostemmadenine + NADPH + 2 H(+). CC -!- The enzyme, characterized from the plant Catharanthus roseus CC (Madagascar periwinkle), participates in a biosynthetic pathway that CC leads to production of the bisindole alkaloid compounds vinblastine CC and vincristine, which are used as anticancer drugs. DR A0A2P1GIY9, REDX2_CATRO; //