Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Homodimer. The N-terminus is blocked. On the basis of immunological and kinetics data, GST 5.7 is distinct from alpha, mu and pI classes of GTS. However it has been postulated that this protein may be part of a distinct subgroup within this alpha class. The variations were found from AA sequencing and imply there are multiple forms of this protein. These variations are likely to be sex-linked and tissue specific. Belongs to the GST superfamily. Alpha family.