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In enzymology, an abscisic-aldehyde oxidase (EC 1.2.3.14) is an enzyme that catalyzes the chemical reaction

abscisic aldehyde + H₂O + O₂ ${\displaystyle \rightleftharpoons }$ abscisate + H₂O₂

The 3 substrates of this enzyme are abscisic aldehyde, H₂O, and O₂, whereas its two products are abscisate and H₂O₂.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with oxygen as acceptor. The systematic name of this enzyme class is abscisic-aldehyde:oxygen oxidoreductase. Other names in common use include abscisic aldehyde oxidase, AAO3, AOd, and AOdelta. This enzyme participates in carotenoid biosynthesis.

References

• Sagi M, Fluhr R, Lips SH (1999). "Aldehyde oxidase and xanthine dehydrogenase in a flacca tomato mutant with deficient abscisic acid and wilty phenotype". Plant Physiol. 120 (2): 571–8. doi:10.1104/pp.120.2.571. PMC 59296. PMID 10364409.
• Koornneef M, Kamiya Y, Koshiba T (2000). "The Arabidopsis aldehyde oxidase 3 (AAO3) gene product catalyzes the final step in abscisic acid biosynthesis in leaves". Proc. Natl. Acad. Sci. U.S.A. 97 (23): 12908–13. doi:10.1073/pnas.220426197. PMC 18863. PMID 11050171.
• Seo M, Koiwai H, Akaba S, Komano T, Oritani T, Kamiya Y, Koshiba T (2000). "Abscisic aldehyde oxidase in leaves of Arabidopsis thaliana". Plant J. 23 (4): 481–8. doi:10.1046/j.1365-313x.2000.00812.x. PMID 10972874.

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