ID 2.3.1.325 DE 17,18-epoxy-17-hydroxycur-19-ene N-malonyltransferase. CA 17,18-epoxy-17-hydroxycur-19-ene + malonyl-CoA = prestrychnine + CoA. CC -!- The enzyme, characterized from the tree Strychnos nux-vomica, CC catalyzes the last step in the biosynthesis of strychnine. CC -!- The product, prestrychnine, undergoes a slow spontaneous CC decarboxylation and cyclization, forming strychnine. DR P0DO84, AT_STRNX ; //