Enables glutathione binding activity; glutathione transferase activity; and identical protein binding activity. Involved in several processes, including Leydig cell differentiation; response to lipopolysaccharide; and response to xenobiotic stimulus. Located in several cellular components, including endoplasmic reticulum; mitochondrion; and peroxisomal membrane. Is integral component of membrane. Orthologous to human MGST1 (microsomal glutathione S-transferase 1). [provided by Alliance of Genome Resources, Apr 2022]