Hydrolyzes glucosinolates to a labile aglycone. This rapidly undergoes spontaneous rearrangement, eliminating sulfur to yield a number of toxic metabolites. Thereby developing a chemical defense system that exploits and mimics the host plant. a thioglucoside + H2O = a sugar + a thiol. Optimum pH is 5.5 with sinigrin as substrate. Homodimer. Expressed in the skeletal muscle tissues surrounding the head, abdomen and thorax. Not expressed in flight muscles (at protein level). Expression in the head and thoracic muscle starts during embryonic development and levels continue to accumulate after the nymphs are born (at protein level). Belongs to the glycosyl hydrolase 1 family.