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. 1971 Jan;7(1):144–154. doi: 10.1128/jvi.7.1.144-154.1971

Effects of Elevated Temperatures on Mengovirus Ribonucleic Acid Synthesis and Virus Production in Novikoff Rat Hepatoma Cells

Mary Ann Shea 1, Peter G W Plagemann 1
PMCID: PMC356088  PMID: 5543427

Abstract

The production of mengovirus in Novikoff rat hepatoma cells is progressively reduced with an increase in incubation temperature of the cells from 34 to 40 C, in spite of the fact that about the same amounts of single-stranded and double-stranded viral ribonucleic acid (RNA) are synthesized at 34, 37, and 40 C; the rate of overall protein synthesis is as high at 40 C as at 37 C. At 40 C, progeny viral RNA accumulates in an undegraded form without being incorporated into virus particles. The results suggest that virus maturation is preferentially inhibited at supraoptimal temperatures. At 42 C, on the other hand, no viral RNA is produced and no viral RNA polymerase activity is detectable in cell lysates. Failure of infected cells to form viral RNA polymerase at 42 C is probably due to an impairment of protein synthesis since most of the polyribosomes are rapidly lost during incubation at 42 C and the rate of amino acid incorporation into protein is 70% lower at 42 C than at 37 C. When infected cells are shifted from 37 to 42 C during the period of active viral RNA synthesis, viral RNA polymerase activity is rapidly lost from the cells, and viral RNA synthesis ceases within 45 min. In contrast, the RNA polymerase is as active in vitro at 42 C as at 37 C, and the activity is relatively stable at 42 C.

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Selected References

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