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. 1992 Sep 15;286(Pt 3):929–935. doi: 10.1042/bj2860929

Characterization of a human class-Theta glutathione S-transferase with activity towards 1-menaphthyl sulphate.

A J Hussey 1, J D Hayes 1
PMCID: PMC1132992  PMID: 1417752

Abstract

A purification scheme is described for a glutathione S-transferase (GST) from human liver that catalyses the conjugation of 1-menaphthyl sulphate (MS) with GSH; the method devised results in an approx. 500-fold increase in specific activity towards MS. The human enzyme which metabolizes MS is a homodimer comprising subunits of M(r) 25,100, and immunochemical experiments have shown it to be a member of the class-Theta GSTs. Automated Edman degradation of this enzyme has confirmed that it is a Theta-class GST bu the amino acid sequence obtained differs from that of GST theta described previously [Meyer, Coles, Pemble, Gilmore, Fraser & Ketterer (1991) Biochem. J. 274, 409-414]. We have therefore designated the enzyme that catalyses the conjugation of MS with GSH GST T2-2* (in the absence of complete amino acid sequence data, the T1 and T2 subunits are provisionally designated T1* and T2*); the evidence which indicates that GST theta (which should possibly now be called GST T1-1*) and GST T2-2* represent distinct isoenzymes is discussed.

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Selected References

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