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• W2119789069 abstract "The procedure developed for purification of the N-ethylmaleimide-activated microsomal glutathione transferase was applied successfully to isolation of this same enzyme in unactivated form. The microsomal glutathione transferases, the unactivated and activated forms, were shown to be identical in terms of molecular weight, immunochemical properties, and amino acid composition. In addition the microsomal glutathione transferase purified in unactivated form could be activated 15-fold with N-ethylmaleimide to give the same specific activity with 1-chloro-2,4-dinitrobenzene as that observed for the enzyme isolated in activated form. This activation involved the binding of one molecule N-ethylmaleimide to the single cysteine residue present in each polypeptide chain of the enzyme, as shown by amino acid analysis, determination of sulfhydryl groups by 2,2'-dithiopyridyl and binding of radioactive N-ethylmaleimide. Except for the presence of only a single cysteine residue and the total absence of tryptophan, the amino acid composition of the microsomal glutathione transferase is not remarkable. The contents of aspartic acid/asparagine + glutamic acid/glutamine, of basic amino acids, and of hydrophobic amino acids are 15%, 12% and 54% respectively. The isoelectric point of the enzyme is 10.1. Microsomal glutathione transferase conjugates a wide range of substrates with glutathione and also demonstrates glutathione peroxidase activity with cumene hydroperoxide, suggesting that it may be involved in preventing lipid peroxidation. Of the nine substrates identified here, the enzymatic activity towards only two, 1-chloro-2,4-dinitrobenzene and cumene hydroperoxide, could be increased by treatment with N-ethylmaleimide. This treatment results in increases in both the apparent Km values and V values for 1-chloro-2,4-dinitrobenzene and cumene hydroperoxide. Thus, although clearly distinct from the cytosolic glutathione transferases, the microsomal enzyme shares certain properties with these soluble enzymes, including a relative abundance, a high isoelectric point and a broad substrate specificity. The exact role of the microsomal glutathione transferase in drug metabolism, as well as other possible functions, remains to be established." @default.
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• W2119789069 date "1983-08-01" @default.
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• W2119789069 title "Microsomal Glutathione Transferase. Purification in Unactivated Form and further Characterization of the Activation Process, Substrate Specificity and Amino Acid Composition" @default.
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• W2119789069 doi "https://doi.org/10.1111/j.1432-1033.1983.tb07607.x" @default.
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