Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Causes an allergic reaction in human. Binds to IgE in 45% of the 106 patients tested allergic to storage mite T.putrescentiae. The percentage decreases to about 18% when sera from these patients is first absorbed with D.pteronyssinus extract indicating high cross-reactivity between the corresponding allergens of the two mites. Induces histamine release from basophils. Belongs to the GST superfamily. Mu family.