IUBMB Enzyme Nomenclature


Accepted name: (S)-stylopine synthase

Reaction: (S)-cheilanthifoline + [reduced NADPH—hemoprotein reductase] + O2 = (S)-stylopine + [oxidized NADPH—hemoprotein reductase] + 2 H2O

For diagram of reaction click here.

Other name(s): (S)-cheilanthifoline oxidase (methylenedioxy-bridge-forming)

Systematic name: (S)-cheilanthifoline,[reduced NADPH—hemoprotein reductase]:oxygen oxidoreductase (methylenedioxy-bridge-forming)

Comments: A cytochrome P-450 (heme-thiolate) protein catalysing an oxidative reaction that does not incorporate oxygen into the product. Forms the second methylenedioxy bridge of the protoberberine alkaloid stylopine from oxidative ring closure of adjacent phenolic and methoxy groups of cheilanthifoline.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Bauer, W. and Zenk, M.H. Two methylenedioxy bridge-forming cytochrome P-450 dependent enzymes are involved in (S)-stylopine biosynthesis. Phytochemistry 30 (1991) 2953-2961.

[EC created 1999 as EC, transferred 2002 to EC, transferred 2018 to EC]

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