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. 1986 Mar;83(5):1290–1294. doi: 10.1073/pnas.83.5.1290

Poly(riboadenylic acid) preferentially inhibits in vitro translation of cellular mRNAs compared with vaccinia virus mRNAs: possible role in vaccinia virus cytopathology.

R Bablanian, A K Banerjee
PMCID: PMC323061  PMID: 3456588

Abstract

Vaccinia virus-induced inhibition of host protein synthesis seems to be mediated by viral transcripts based on their differential inhibition of cellular mRNA translation in a rabbit reticulocyte lysate system. In this study, we demonstrated that the removal of poly(riboadenylic acid) [poly(A)] from the in vitro viral transcripts abolished this inhibition in the same cell-free system. This observation led us to the finding that less than 1 microM poly(A) completely inhibited HeLa cell mRNA translation in the reticulocyte lysate, whereas only 50% inhibition of vaccinia virus mRNA translation was observed at the same concentration. Similar results were also obtained in a wheat germ protein-synthesizing system. This inhibitory effect of poly(A) was totally abrogated by the addition of polydeoxythymidylate. This selective inhibition was highly specific for poly(A) since other homopolymers, including poly(G), poly(C), and poly(dA), were not capable of causing such an inhibition. Poly(U), however, had a moderate selective inhibitory effect. Among the several mRNAs tested, the translation of L-cell, encephalomyocarditis virus, and reovirus RNAs was also sensitive to poly(A). However, vesicular stomatitis virus mRNA translation was strikingly more resistant. These results suggest that poly(A), which is also synthesized by the virion-associated poly(A) polymerase may be involved in vaccinia virus-mediated host cell shutoff.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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