(+)-abscisic acid 8'-hydroxylase

In enzymology, a (+)-abscisic acid 8'-hydroxylase (Template:EC number) is an enzyme that catalyzes the chemical reaction

(+)-abscisate + NADPH + HTemplate:Sup + OTemplate:Sub $\rightleftharpoons$ 8'-hydroxyabscisate + NADPTemplate:Sup + HTemplate:SubO

The four substrates of this enzyme are (+)-abscisate, NADPH, [[hydrogen ion|HTemplate:Sup]], and [[oxygen|OTemplate:Sub]], whereas its three products are 8'-hydroxy-abscisate, [[nicotinamide adenine dinucleotide phosphate|NADPTemplate:Sup]], and [[water|HTemplate:SubO]].

This enzyme belongs to the family of oxidoreductases, to be specific those acting on paired donors, with OTemplate:Sub as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from OTemplate:Sub with NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor. This enzyme participates in carotenoid biosynthesis.

Nomenclature

The systematic name of this enzyme class is abscisate,NADPH:oxygen oxidoreductase (8'-hydroxylating). Other names in common use include

• (+)-ABA 8'-hydroxylase and
• ABA 8'-hydroxylase.

References

• Template:Cite journal
• Template:Cite journal

Template:1.14.13-enzyme-stub