Enables JUN kinase binding activity; glutathione transferase activity; and kinase regulator activity. Involved in several processes, including negative regulation of cell population proliferation; negative regulation of intracellular signal transduction; and negative regulation of macromolecule metabolic process. Acts upstream of or within glutathione metabolic process. Part of protein-containing complex. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; respiratory system; and sensory organ. Human ortholog(s) of this gene implicated in several diseases, including brain disease (multiple); carcinoma (multiple); hematologic cancer (multiple); reproductive organ cancer (multiple); and respiratory system disease (multiple). Orthologous to human GSTP1 (glutathione S-transferase pi 1). [provided by Alliance of Genome Resources, Apr 2022]