Enables glutathione binding activity; glutathione transferase activity; and identical protein binding activity. Involved in several processes, including glutathione metabolic process; response to phenylpropanoid; and xenobiotic catabolic process. Located in cytosol and plasma membrane. Part of protein-containing complex. Biomarker of hypertension. Human ortholog(s) of this gene implicated in several diseases, including autoimmune disease (multiple); eye disease (multiple); gastrointestinal system cancer (multiple); hematologic cancer (multiple); and lung disease (multiple). Orthologous to several human genes including GSTM1 (glutathione S-transferase mu 1). [provided by Alliance of Genome Resources, Apr 2022]