IUBMB Enzyme Nomenclature


Accepted name: 8-dimethylallylnaringenin 2'-hydroxylase

Reaction: sophoraflavanone B + [reduced NADPH—hemoprotein reductase] + O2 = leachianone G + [oxidized NADPH—hemoprotein reductase] + H2O

For diagram of reaction click here.

Glossary: dimethylallyl = prenyl = 3-methylbut-2-en-1-yl
lavandulyl = 5-methyl-2-(prop-1-en-2-yl)hex-4-en-1-yl
leachianone G = (–)-(2S)-2'-hydroxy-8-prenylnaringenin = (–)-(2S)-2-(2,4-dihydroxyphenyl)-5,7-dihydroxy-8-(3-methylbut-2-en-1-yl)-2,3-dihydro-4H-chromen-4-one
naringenin = 5,7-dihydroxy-2-(4-hydroxyphenyl)-2,3-dihydrochromen-4-one
sophoraflavanone B = (–)-(2S)-8-prenylnaringenin = (–)-(2S)-5,7-dihydroxy-2-(4-hydroxyphenyl)-8-(3-methylbut-2-en-1-yl)-2,3-dihydro-4H-chromen-4-one

Other name(s): 8-DMAN 2'-hydroxylase

Systematic name: sophoraflavanone-B,[reduced NADPH—hemoprotein reductase]:oxygen oxidoreductase (2'-hydroxylating)

Comments: A membrane-bound cytochrome P-450 (heme-thiolate) protein that is associated with the endoplasmic reticulum [1,2]. This enzyme is specific for sophoraflavanone B as substrate. Along with EC (naringenin 8-dimethylallyltransferase) and EC (leachianone G 2''-dimethylallyltransferase), this enzyme forms part of the sophoraflavanone G biosynthetic pathway.

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


1. Yamamoto, H., Yatou, A. and Inoue, K. 8-Dimethylallylnaringenin 2'-hydroxylase, the crucial cytochrome P450 mono-oxygenase for lavandulylated flavanone formation in Sophora flavescens cultured cells. Phytochemistry 58 (2001) 671-676. [PMID: 11672730]

2. Zhao, P., Inoue, K., Kouno, I. and Yamamoto, H. Characterization of leachianone G 2''-dimethylallyltransferase, a novel prenyl side-chain elongation enzyme for the formation of the lavandulyl group of sophoraflavanone G in Sophora flavescens Ait. cell suspension cultures. Plant Physiol. 133 (2003) 1306-1313. [PMID: 14551337]

[EC created 2007 asEC, transferred 2018 to EC]

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