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- W2046035394 abstract "As a tool for the study of the capping-methylation process of yeast mRNA, we developed a procedure for the purification of the mRNA (guanine-7-)methyltransferase using the commercial cap analog guanosine(5′)triphospho(5′)guanosine as a substrate and radioactive S-adenosylmethionine (AdoMet) as the methyl group donor. The osmotic-sensitive yeast strain VY 1160 was used as the enzyme source. Little methyltransferase activity was detectable in a crude lysate obtained after osmotic shock. We showed that this was due to the presence of a low-molecular-weight inhibitor which could easily be eliminated by Sephadex G-25 gel filtration. The 10000 ×g supernatant from the crude lysate was submitted to DEAE-cellulose and DNA-agarose chromatography. The resulting preparation was enriched about 450-fold in specific activity. Under standard assay conditions, the incorporation rate remained constant for at least 6 h at 30°C. Transmethylation was not stimulated by KCl nor NaCl. Divalent cations were strong inhibitors. The partially purified enzyme was able to methylate undermethylated poly(A)-rich mRNA isolated from an AdoMet auxotrophic yeast strain briefly exposed to AdoMet-free medium." @default.
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- W2046035394 date "1983-07-01" @default.
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- W2046035394 title "Partial Purification and Characterization of mRNA (Guanine-7-) Methyltransferase from the Yeast Saccharomyces cerevisiae" @default.
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- W2046035394 doi "https://doi.org/10.1111/j.1432-1033.1983.tb07539.x" @default.
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