Enables glutathione binding activity and leukotriene-C4 synthase activity. Involved in several processes, including cellular response to lipid; leukotriene biosynthetic process; and response to axon injury. Located in intracellular membrane-bounded organelle. Biomarker of glomerulonephritis and peripheral nervous system disease. Human ortholog(s) of this gene implicated in asthma. Orthologous to human LTC4S (leukotriene C4 synthase). [provided by Alliance of Genome Resources, Apr 2022]