IUBMB Enzyme Nomenclature


Accepted name: germacrene A hydroxylase

Reaction: (+)-germacrene A + NADPH + H+ + O2 = germacra-1(10),4,11(13)-trien-12-ol + NADP+ + H2O

For diagram of reaction click here.

Systematic name: (+)-germacrene-A,NADPH:oxygen oxidoreductase (12-hydroxylating)

Comments: A heme-thiolate protein (P-450). This is probably part of the biosynthesis of many sesquiterpenoid lactones. In Lactuca sativa EC is a mutifunctional enzyme with EC, germacrene A alcohol dehydrogenase [2].

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


1. de Kraker, J.W., Franssen, M.C., Dalm, M.C., de Groot, A. and Bouwmeester, H.J. Biosynthesis of germacrene A carboxylic acid in chicory roots. Demonstration of a cytochrome P450 (+)-germacrene A hydroxylase and NADP+-dependent sesquiterpenoid dehydrogenase(s) involved in sesquiterpene lactone biosynthesis. Plant Physiol. 125 (2001) 1930-1940. [PMID: 11299372]

2. Nguyen, D.T., Gopfert, J.C., Ikezawa, N., Macnevin, G., Kathiresan, M., Conrad, J., Spring, O. and Ro, D.K. Biochemical conservation and evolution of germacrene A oxidase in asteraceae. J. Biol. Chem. 285 (2010) 16588-16598. [PMID: 20351109]

[EC created 2011]

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