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Interferon activity produced by translation of human interferon messenger RNA in cell-free ribosomal systems and in Xenopus oöcytes.
Reynolds FH, Premkumar E, Pitha PM.
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Translation of messenger RNA isolated from poly(rI)-poly(rC)-induced human fibroblasts in cell-free ribosomal systems and in Xenopus oocytes resulted in the production of biologically active proteins that had the properties of human fibroblast interferon. The translation in the oocytes was much more efficient, giving approximately 500 times higher titers of interferon activity than the cell-free systems. A control messenger RNA isolated from noninduced human fibroblasts, did not code for interferon synthesis in these systems. Both messenger RNA preparations stimulated [3H]amino-acid incorporation into trichloroacetic acid-insoluble material. The radioactive products and their immunoprecipitates were electrophoresed on polyacrylamide gels under denaturing conditions. The products resulting from the translation of the control (uninduced) messenger RNA in oocytes contained a major protein of approximately 45,000 molecular weight. The messenger RNA isolated from poly(rI)-poly(rC)-induced cells stimulated the synthesis of an additional 25,000 molecular weight protein that electrophoresed in the same position as human fibroblast interferon. These results suggest that human fibroblast interferon was synthesized by the translation of its messenger RNA in Xenopus oocytes and in cell-free ribosomal systems.
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