Electrophoretic and immunological analysis of human glutathione S-transferase isozymes.
Several electrophoretically distinct glutathione S-transferase isozymes from different tissues have been purified and characterized. The data confirm the suggestion that GST-1, GST-2 and GST-3 are the products of separate genetic loci. An apparently muscle-specific isozyme termed GST-4 has been identified and shown to differ structurally from GST-1, GST-2 and GST-3. It is likely that GST-4 is the product of an additional gene locus. Two isozymes termed GST-5 and GST-6 were purified from brain. GST-5 has a different isoelectric point, but shares many structural features with GST-1. GST-5 may be a brain-specific post-translationally modified product of the GST-1 gene. GST-6 is an acidic isozyme found in many tissues. The data indicate that GST-6 is composed of two dissimilar subunits that do not cross-react with antiserum directed against GST-1, GST-2 or GST-3. These observations therefore suggest that GST-6 may have an independent genetic origin.
D000595:Amino Acid Sequence; D004587:Electrophoresis, Agar Gel; D004591:Electrophoresis, Polyacrylamide Gel; D005982:Glutathione Transferase / Q000032:analysis* / Q000235:genetics; D006801:Humans; D005779:Immunodiffusion; D007527:Isoenzymes / Q000032:analysis* / Q000235:genetics; D014018:Tissue Distribution
D007527:Isoenzymes; D005982:Glutathione Transferase