IUBMB Enzyme Nomenclature


Accepted name: abscisic-aldehyde oxidase

Reaction: abscisic aldehyde + H2O + O2 = abscisate + H2O2

For diagram click here.

Other name(s): abscisic aldehyde oxidase; AAO3; AOd

Systematic name: abscisic-aldehyde:oxygen oxidoreductase

Comments: Acts on both (+)- and (–)-abscisic aldehyde. Involved in the abscisic-acid biosynthesis pathway in plants, along with EC, (xanthoxin dehydrogenase), EC (9-cis-epoxycarotenoid dioxygenase) and EC [(+)-abscisic acid 8'-hydroxylase]. While abscisic aldehyde is the best substrate, the enzyme also acts with indole-3-aldehyde, 1-naphthaldehyde and benzaldehyde as substrates, but more slowly [3].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 129204-36-0


1. Sagi, M., Fluhr, R. and Lips, S.H. Aldehyde oxidase and xanthin dehydrogenase in a flacca tomato mutant with deficient abscisic acid and wilty phenotype. Plant Physiol. 120 (1999) 571-577. [PMID: 10364409]

2. Seo, M., Peeters, A.J., Koiwai, H., Oritani, T., Marion-Poll, A., Zeevaart, J.A., Koornneef, M., Kamiya, Y. and Koshiba, T. The Arabidopsis aldehyde oxidase 3 (AAO3) gene product catalyzes the final step in abscisic acid biosynthesis in leaves. Proc. Natl. Acad. Sci. USA 97 (2000) 12908-12913. [PMID: 11050171]

3. Seo, M., Koiwai, H., Akaba, S., Komano, T., Oritani, T., Kamiya, Y. and Koshiba, T. Abscisic aldehyde oxidase in leaves of Arabidopsis thaliana. Plant J. 23 (2000) 481-488. [PMID: 10972874]

[EC created 2005]

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