Characterization of the basic glutathione S-transferase B1 and B2 subunits from human liver

The basic glutathione S-transferases in human liver are composed of at least two immunochemically distinct polypeptides, designated B1 and B2. These subunits exist as homodimers, but can hybridize to form the B1B2 heterodimer [Stockman, Beckett subunit B1 yielded 43 tryptic peptides, seven of which were unique, whereas subunit B2 yielded 40 tryptic peptides, four of which were unique.