Involved in multiple disease resistance (MDR). glutathione + RX = a halide anion + an S-substituted glutathione + H(+) The presence of Asp-179 is significantly associated with a multiple disease resistance. Belongs to the GST superfamily. PubMed:11080288 describes GST23 and GST36 as two different members of the GST family but they seem to be allelic variants of the same gene.