ExplorEnz: EC 1.2.3.14

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1.2.3.14

Accepted name:

abscisic-aldehyde oxidase

Reaction:

abscisic aldehyde + H₂O + O₂ = abscisate + H₂O₂

For diagram of abscisic acid biosynthesis, click here

Other name(s):

abscisic aldehyde oxidase; AAO3; AOd; AOδ

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 1.1.1.288, (xanthoxin dehydrogenase), EC 1.13.11.51 (9-cis-epoxycarotenoid dioxygenase) and EC 1.14.14.137 [(+)-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, Gene, KEGG, MetaCyc, CAS registry number: 129204-36-0

References:

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. [DOI] [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. [DOI] [PMID: 10972874]

[EC 1.2.3.14 created 2005]