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Rat liver glutathione S-transferases. Complete nucleotide sequence of a glutathione S-transferase mRNA and the regulation of the Ya, Yb, and Yc mRNAs by 3-methylcholanthrene and phenobarbital.

Open AccessPublished:April 25, 1984DOI:https://doi.org/10.1016/S0021-9258(17)42973-5
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      With the use of cDNA probes reverse transcribed from purified glutathione S-transferase mRNA templates, four cDNA clones complementary to transferase mRNAs have been identified and characterized. Two clones, pGTB38 and pGTB34, have cDNA inserts of approximately 950 and 900 base pairs, respectively, and hybridize to a mRNA(s) whose size is approximately 980 nucleotides. In hybrid-select translation experiments, pGTB38 and pGTB34 select mRNAs specific for the Ya and Yc subunits of rat liver glutathione S-transferases. Clone pGTB33, which harbors a truncated cDNA insert, hybrid-selects only the Ya mRNA. All of the clones, pGTB38, pGTB34, and pGTB33, hybrid-select another mRNA which is specific for a polypeptide with an electrophoretic mobility slightly greater than the Ya subunit. The entire nucleotide sequence of the full length clone, pGTB38, has been determined and the complete amino acid sequence of the corresponding polypeptide has been deduced. The mRNA codes for a protein comprising 222 amino acids with Mr = 25,547. We have also identified a cDNA clone complementary to a Yb mRNA of the rat liver glutathione S-transferases. This clone, pGTA/C36, hybrid-selects only Yb mRNA(s) and hybridizes to a mRNA(s) whose size is approximately 1200 nucleotides. Although the Ya, Yb, and Yc mRNAs are elevated coordinately by phenobarbital and 3-methylcholanthrene, the Ya-Yc mRNAs are induced to a much greater extent compared to the Yb mRNA(s). These data suggest that the mRNAs for each transferase isozyme are regulated independently.

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