Glucosidase specifically involved in alkaloid biosynthesis leading to the accumulation of several alkaloids, including ajmaline, an important plant-derived pharmaceutical used in the therapy of heart disorders. 3alpha(S)-strictosidine + H2O = D-glucose + strictosidine aglycone kcat is 9.8 sec(-1) with strictosidine as substrate (at pH 5.7 and 30 degrees Celsius. Belongs to the glycosyl hydrolase 1 family.