IUBMB Enzyme Nomenclature


Accepted name: 8-epi-inunolide synthase

Reaction: germacra-1(10),4,11(13)-trien-12-oate + [reduced NADPH—hemoprotein reductase] + O2 = 8-epi-inunolide + [oxidized NADPH—hemoprotein reductase] + 2 H2O (overall reaction)
(1a) germacra-1(10),4,11(13)-trien-12-oate + [reduced NADPH—hemoprotein reductase] + O2 = 8α-hydroxygermacra-1(10),4,11(13)-trien-12-oate + [oxidized NADPH—hemoprotein reductase] + H2O
(1b) 8α-hydroxygermacra-1(10),4,11(13)-trien-12-oate = 8-epi-inunolide + H2O (spontaneous)

Glossary: 8-epi-inunolide = germacra-1(10),4,11(13)-trien-12,8α-lactone

Other name(s): CYP71BL1

Systematic name: germacra-1(10),4,11(13)-trien-12-oate,[reduced NADPH—hemoprotein reductase]:oxygen oxidoreductase (8α-hydroxylating)

Comments: A cytochrome P-450 (heme-thiolate) protein from the plant Inula hupehensis. The enzyme also produces 8β-hydroxygermacra-1(10),4,11(13)-triene-12-oate (EC, germacrene A acid 8β-hydroxylase).

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


1. Gou, J., Hao, F., Huang, C., Kwon, M., Chen, F., Li, C., Liu, C., Ro, D.K., Tang, H. and Zhang, Y. Discovery of a non-stereoselective cytochrome P450 catalyzing either 8α- or 8β-hydroxylation of germacrene A acid from the Chinese medicinal plant, Inula hupehensis. Plant J. 93 (2018) 92-106. [PMID: 29086444]

[EC created 2018]

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