Beta-D-glucopyranosyl abscisate beta-glucosidase (, AtBG1, ABA-beta-D-glucosidase, ABA-specific beta-glucosidase, ABA-GE hydrolase, beta-D-glucopyranosyl abscisate hydrolase) is an enzyme with systematic name beta-D-glucopyranosyl abscisate glucohydrolase. It catalyses the following chemical reaction
The enzyme characterised from barley and Arabidopsis thaliana removes the glycoside unit from the biologically inactive abscisic acid β-D-glucosyl ester to give the plant hormone, abscisic acid, and D-glucose.
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