EC 2.1.1.122     
Accepted name: (S)-tetrahydroprotoberberine N-methyltransferase
Reaction: S-adenosyl-L-methionine + (S)-7,8,13,14-tetrahydroprotoberberine = S-adenosyl-L-homocysteine + cis-N-methyl-(S)-7,8,13,14-tetrahydroprotoberberine
Other name(s): tetrahydroprotoberberine cis-N-methyltransferase
Systematic name: S-adenosyl-L-methionine:(S)-7,8,13,14-tetrahydroprotoberberine cis-N-methyltransferase
Comments: Involved in the biosynthesis of isoquinoline alkaloids in plants.
References:
1.  Rueffer, M., Zumstein, G., Zenk, M.H. Partial purification and characterization of S-adenosyl-L-methionine:(S)-tetrahydroprotoberberine cis-N-methyltransferase from suspension-cultured cells of Eschscholtzia and Corydalis. Phytochemistry 29 (1990) 3727–3733.
[EC 2.1.1.122 created 1999]