Function
S-adenosyl-L-methionine-dependent N-methyltransferase that catalyzes a nitrogen methylation involved in vindoline biosynthesis (PubMed:20956330, PubMed:21802100). Displays a strict requirement for a 2,3-dihydro bond in the aspidosperma skeleton (PubMed:20956330). Can use 2,3-dihydrotabersonine, 2,3-dihydro-3-hydroxytabersonine and 2,3,6,7-tetraydro-3-hydroxytabersonine as substrates, but not tabersonine, vincadifformine, picrinine, 21-hydroxycyclolochnericine, tryptamine, norharmane, harmaline, catharanthine, norajmaline, ajmaline, serpentine, ajmalicine, yohimbine or gamma-tocopherol (PubMed:20956330, PubMed:26848097).