Accepted name: tetrahydroberberine oxidase
Reaction: (S)-tetrahydroberberine + 2 O2 = berberine + 2 H2O2
Other name(s): (S)-THB oxidase
Systematic name: (S)-tetrahydroberberine:oxygen oxidoreductase
Comments: The enzyme from Berberis sp. is a flavoprotein; that from Coptis japonica is not. (R)-Tetrahydroberberines are not oxidized.
1.  Amann, M., Nagakura, N. and Zenk, M.H. (S)-Tetrahydroprotoberberine oxidase the final enzyme in protoberberine biosynthesis. Tetrahedron Lett. 25 (1984) 953–954.
2.  Okada, N., Shinmyo, A., Okada, H. and Yamada, Y. Purification and characterization of (S)-tetrahydroberberine oxidase from cultured Coptis japonica cells. Phytochemistry 27 (1988) 979–982.
[EC created 1990 (EC created 1989, incorporated 1992)]

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