Xanthoxin dehydrogenase

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Xanthoxin dehydrogenase
Identifiers
EC no. 1.1.1.288
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In enzymology, a xanthoxin dehydrogenase (EC 1.1.1.288) is an enzyme that catalyzes the chemical reaction

xanthoxin + NAD+ abscisic aldehyde + NADH + H+

Thus, the two substrates of this enzyme are xanthoxin and NAD+, whereas its 3 products are abscisic aldehyde, NADH, and H+.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is xanthoxin:NAD+ oxidoreductase. Other names in common use include xanthoxin oxidase, and ABA2. This enzyme participates in carotenoid biosynthesis.

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Abscisic aldehyde is an intermediate in the biosynthesis of the plant hormone abscisic acid. It is produced by the dehydrogenation of xanthoxin by xanthoxin dehydrogenases, which is an NAD+ dependent short-chain dehydrogenase, followed by selective oxidation by abscisic aldehyde oxygenase.

References


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