Glutathione S-transferase that catalyzes the conjugation of glutathione to exogenous and endogenous compounds. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Homodimer. Predominantly expressed in heart, kidney, liver and skeletal muscle. Acetylation of Lys-93 is observed in liver mitochondria from fasted mice but not from fed mice. Belongs to the GST superfamily. Kappa family.