IUBMB Enzyme Nomenclature


Accepted name: pseudobaptigenin synthase

Reaction: (1) calycosin + [reduced NADPH—hemoprotein reductase] + O2 = pseudobaptigenin + [oxidized NADPH—hemoprotein reductase] + 2 H2O
(2) pratensein + [reduced NADPH-hemoprotein reductase] + O2 = 5-hydroxypseudobaptigenin + [oxidized NADPH—hemoprotein reductase] + 2 H2O

Glossary: calycosin = 3'-hydroxyformononetin
pratensein = 3'-hydroxybiochanin A

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

Comments: A cytochrome P-450 (heme-thiolate) enzyme catalysing an oxidative reaction that does not incorporate oxygen into the product. Catalyses a step in the biosynthesis of (–)-maackiain, the main pterocarpan phytoalexin in chickpea (Cicer arietinum).

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


1. Clemens S., Barz W. Cytochrome P450-dependent methylenedioxy bridge formation in Cicer arietinum. Phytochemistry 41 (1996) 457-460.

[EC created 2011 as EC, transferred 2018 to EC]

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