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. 1985 Sep 15;230(3):609–615. doi: 10.1042/bj2300609

Isoenzymes of glutathione transferase in rat kidney cytosol.

C Guthenberg, H Jensson, L Nyström, E Osterlund, M K Tahir, B Mannervik
PMCID: PMC1152662  PMID: 4062866

Abstract

Glutathione transferases from rat kidney cytosol were purified about 40-fold by chromatography on S-hexylglutathione linked to epoxy-activated Sepharose 6B. Further purification by fast protein liquid chromatography with chromatofocusing in the pH interval 10.6-7.6 resolved five major peaks of activity with 1-chloro-2,4-dinitrobenzene as the second substrate. Four of the peaks were identified with rat liver transferases 1-1, 1-2, 2-2 and 4-4 respectively. The criteria used for identification included physical properties, reactions with specific antibodies, substrate specificities and sensitivities to several inhibitors. The fourth major peak is a 'new' form of transferase, which has not been found in rat liver. This isoenzyme, glutathione transferase 7-7, has a lower apparent subunit Mr than any of the transferases isolated from rat liver cytosol, and does not react with antibodies raised against the liver enzymes. Glutathione transferases 3-3 and 3-4, which are abundant in liver, were only present in very small amounts. In a separate chromatofocusing separation in a lower pH interval, an additional peak was eluted at pH 6.3. This isoenzyme is characterized by its high activity with ethacrynic acid.

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Selected References

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