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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Analysis of glutathione S-transferase-catalyzed S-alkylglutathione formation by high-performance liquid chromatography.

Metabolism of alkyl halides and some organophosphorous compounds by glutathione S-transferases (EC leads to formation of an S-alkylglutathione as a common product. We have developed an HPLC assay for formation of S-methylglutathione and S-ethylglutathione that is applicable to measuring enzyme activity toward a variety of xenobiotic substrates. The conjugates are derivatized with 1-fluoro-2,4-dinitrobenzene to form the corresponding N-2,4-dinitrophenyl derivatives, which are then separated by reverse-phase HPLC with gradient elution. The utility of the method is illustrated by the use of partially purified preparations of rat liver glutathione S-transferases and several prototypic substrates including iodomethane, iodoethane, dichlorvos, and methyl parathion. The limit of detection is about 50 pmol of N-(2,4-dinitrophenyl)-S-alkylglutathione. Advantages of the method over other assays of S-alkyl transferase activity are discussed.[1]


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