Arabidopsis thaliana β-glucosidase BGLU15 attacks flavonol 3-O-β-glucoside-7-O-α-rhamnosides

Rapid disappearance of kaempferol 3-O-β-glucoside-7-O-α-rhamnoside (1) and quercetin 3-O-β-glucoside-7-O-α-rhamnoside (2) occurs in Arabidopsis thaliana during abiotic stress recovery. Here, it is shown that a β-glucosidase, BGLU15, is specific for the 3-O-β-glucoside position of compounds 1 and 2, yielding kaempferol 7-O-α-rhamnoside (3) and quercetin 7-O-α-rhamnoside (4), respectively.