Accepted name: (S)-corytuberine synthase
Reaction: (S)-reticuline + [reduced NADPH—hemoprotein reductase] + O2 = (S)-corytuberine + [oxidized NADPH—hemoprotein reductase] + 2 H2O.
Other name(s): CYP80G2
Systematic name: (S)-reticuline,NADPH:oxygen oxidoreductase (C-C phenol-coupling; (S)-corytuberine-forming)
Comments: A cytochrome P-450 (heme-thiolate) protein. The enzyme is involved in the biosynthesis of the quaternary benzylisoquinoline alkaloid magnoflorine in the plant Coptis japonica. It is specific for (S)-reticuline.
1.  Ikezawa, N., Iwasa, K. and Sato, F. Molecular cloning and characterization of CYP80G2, a cytochrome P450 that catalyzes an intramolecular C-C phenol coupling of (S)-reticuline in magnoflorine biosynthesis, from cultured Coptis japonica cells. J. Biol. Chem. 283 (2008) 8810–8821. [PMID: 18230623]
[EC created 2017]