Abstract
Seven major isoenzymes of glutahione transferase with isoelectric points ranging from pH 6.9 to 10 were isolated from rat liver cytosol. The purification procedure included affinity chromatography on immobilized S-hexylglutathione followed by high-performance liquid chromatofocusing. Characteristics, such as physical properties, reactions with antibodies, specific activities with various substrates, kinetic constants, and sensivities to a set of inhibitors, are given for discrimination and identification of the different isoenzymes. The multiple forms of the enzyme correspond to glutathione transferases 1-1, 1-2, 2-2, 3-3, 3-4, and 4-4 in the recently introduced nomenclature [W. B. Jakoby et al. (1984) Biochem. Pharmacol. 33, 2539–2540]. A seventh form appears to be a heterodimeric protein composed of subunit 3 and an as yet unidentified subunit.
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