Enables glutathione transferase activity and identical protein binding activity. Predicted to be involved in several processes, including cellular detoxification of nitrogen compound; glutathione metabolic process; and nitrobenzene metabolic process. Located in sperm fibrous sheath. Is expressed in several structures, including alimentary system; central nervous system; cranium; integumental system; and sensory organ. Human ortholog(s) of this gene implicated in several diseases, including Alzheimer's disease; bone cancer (multiple); cystic fibrosis; larynx cancer; and multiple sclerosis. Orthologous to human GSTM3 (glutathione S-transferase mu 3). [provided by Alliance of Genome Resources, Apr 2022]