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).
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]
Transferred entry: pseudobaptigenin synthase. Now EC, pseudobaptigenin synthase.
[EC created 2011, deleted 2018]