Acetyltransferase that catalyzes the formation of vinorine, a precursor of the antiarrhythmic monoterpenoid indole alkaloid ajmaline. Acts on gardneral, but not on polyneuridine aldehyde or N-methylgardneral. 16-epivellosimine + acetyl-CoA = CoA + vinorine Complete inhibition by 4-(2-aminoethyl)-benzenesulfonyl fluoride (AEBSF), N-tosyl-L-phenylalanine chloromethylketone (TPCK), Hg(2+) and diethyl-pyrocarbonate (DEPC) (PubMed:15110860). 50% inhibition by N-(N-(L-3-trans-carboxirane-2-carbonyl)-L-leucyl)-agmanitine (E-64), N-alpha-p-tosyl-L-lysine chloromethylketone (TLCK) and phenylmethylsulfonyl fluoride (PMSF) (PubMed:15110860). Except vinorine, no other acetylated alkaloids are deacetylated by the reverse reaction. Optimum pH is 7.8. Optimum temperature is 35 degrees Celsius. Monomer. Belongs to the plant acyltransferase family.