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cis-acting translational effects of the 5' noncoding region of c-myc mRNA.
Parkin N, Darveau A, Nicholson R, Sonenberg N.
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We have previously shown that the 5' noncoding region of mouse c-myc mRNA has a negative effect on translational efficiency in a rabbit reticulocyte lysate (A. Darveau, J. Pelletier, and N. Sonenberg, Proc. Natl. Acad. Sci. USA 82:2315-2319, 1985). We wanted to localize and characterize the inhibitory translational element(s) in the mRNA and to study its effect in other in vitro and in vivo systems. Here we report that the restrictive element is confined to a 240-nucleotide sequence of the 5' noncoding region of mouse c-myc mRNA and that this sequence acts in cis to inhibit the translation of a heterologous mRNA. In addition, we report that the cis-inhibitory effect is also exhibited in microinjected Xenopus oocytes and wheat-germ extracts but not in HeLa cell extracts. Transfection of corresponding plasmid DNA constructs into several established cell lines did not produce the cis-inhibitory effect. A model to explain these results is presented.
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