Bernstein, Harris D. and Sonenberg, Nahum and Baltimore, David (1985) Poliovirus Mutant That Does Not Selectively Inhibit Host Cell Protein Synthesis. Molecular and Cellular Biology, 5 (11). pp. 2913-2923. ISSN 0270-7306 http://resolver.caltech.edu/CaltechAUTHORS:20120627-143833298
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A poliovirus type I (Mahoney strain) mutant was obtained by inserting three base pairs into an infectious cDNA clone. The extra amino acid encoded by the insertion was in the amino-terminal (protein 8) portion of the P2 segment of the polyprotein. The mutant virus makes small plaques on HeLa and monkey kidney (CV-1) cells at all temperatures. It lost the ability to mediate the selective inhibition of host cell translation which ordinarily occurs in the first few hours after infection. As an apparent consequence, the mutant synthesizes far less protein than does wild-type virus. In mutant-infected CV-1 cells enough protein was produced to permit a normal course of RNA replication, but the yield of progeny virus was very low. In mutant-infected HeLa cells there was a premature cessation of both cellular and viral protein synthesis followed by a premature halt of viral RNA synthesis. This nonspecific translational inhibition was distinguishable from wild-type-mediated inhibition and did not appear to be part of an interferon or heat shock response. Because the mutant is recessive, our results imply that (at least in HeLa cells) wild-type poliovirus not only actively inhibits translation of cellular mRNAs, but also avoids early inhibition of its own protein synthesis. Cleavage of the cap-binding complex protein P220, which has been associated with the selective inhibition of capped mRNA translation, did not occur in mutant-infected cells. This result supports the hypothesis that cleavage of P220 plays an important role in normal poliovirus-mediated translational inhibition.
|Additional Information:||© 1985 American Society for Microbiology. Received 20 May 1985. Accepted 1 August 1985. We thank Peter Samow and Karla Kirkegaard for continuous support and helpful suggestions during the course of this work and for comments on the manuscript. We also thank Dolores Harrison for excellent technical assistance. The anti-P220 antiserum was a gift from Isaac Edery. This work was supported by Public Health Service grant AI22346 from the National Institute for Allergy and Infectious Diseases to D. B. and a grant from the Medical Research Council and National Cancer Institute of Canada to N .S.|
|Official Citation:||Poliovirus mutant that does not selectively inhibit host cell protein synthesis. H D Bernstein, N Sonenberg, and D Baltimore Mol. Cell. Biol. November 1985 5:2913-2923; doi:10.1128/MCB.5.11.2913|
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|Deposited By:||Ruth Sustaita|
|Deposited On:||27 Jun 2012 23:01|
|Last Modified:||27 Jun 2012 23:01|
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