IUBMB Enzyme Nomenclature


Accepted name: indole-3-pyruvate monooxygenase

Reaction: (indol-3-yl)pyruvate + NADPH + H+ + O2 = (indol-3-yl)acetate + NADP+ + H2O + CO2

For diagram of reaction click here.

Glossary: (indol-3-yl)pyruvate = 3-(1H-indol-3-yl)-2-oxopropanoate
(indol-3-yl)acetate = 2-(1H-indol-3-yl)acetate = indole-3-acetate

Other name(s): YUC2 (gene name); spi1 (gene name)

Systematic name: indole-3-pyruvate,NADPH:oxygen oxidoreductase (1-hydroxylating, decarboxylating)

Comments: This plant enzyme, along with EC L-tryptophan—pyruvate aminotransferase, is responsible for the biosynthesis of the plant hormone indole-3-acetate from L-tryptophan.

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


1. Mashiguchi, K., Tanaka, K., Sakai, T., Sugawara, S., Kawaide, H., Natsume, M., Hanada, A., Yaeno, T., Shirasu, K., Yao, H., McSteen, P., Zhao, Y., Hayashi, K., Kamiya, Y. and Kasahara, H. The main auxin biosynthesis pathway in Arabidopsis. Proc. Natl. Acad. Sci. USA 108 (2011) 18512-18517. [PMID: 22025724]

2. Zhao, Y. Auxin biosynthesis: a simple two-step pathway converts tryptophan to indole-3-acetic acid in plants. Mol. Plant 5 (2012) 334-338. [PMID: 22155950]

[EC created 2012]

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