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. 1994 Dec;68(12):8304–8311. doi: 10.1128/jvi.68.12.8304-8311.1994

Differential response of human cells to deletions and stop codons in the gamma(1)34.5 gene of herpes simplex virus.

J Chou 1, A P Poon 1, J Johnson 1, B Roizman 1
PMCID: PMC237299  PMID: 7966624

Abstract

Earlier studies have shown that herpes simplex virus mutants lacking the gamma(1)34.5 gene are totally avirulent on intracerebral inoculation of the virus into mice and induce premature shutoff of protein synthesis in human neuroblastoma (SK-N-SH) cells but not in Vero cells. We report the following. (i) Whereas deletion mutant R3616, lacking 1,000 bp of the gamma(1)34.5 gene, caused premature shutoff of protein synthesis in both SK-N-SH and human foreskin fibroblasts (HFF), mutants R4009 and R930 (mutant F), carrying stop codons in all six frames, 27 and 210 codons from the initiation codon of the gamma(1)34.5 genes, respectively, induced shutoff of protein synthesis in SK-N-SH cells but not in HFF. The differences in behavior between the R3616 deletion and R4009 stop codon mutants cannot be attributed to differences in the rate of induction of premature shutoff of protein synthesis and the multiplicity of infection. HFF do not produce detectable truncated gamma(1)34.5 protein or truncated mRNA. (ii) Some clonal lines of SK-N-SH cells carrying a gamma(1)34.5 gene driven by a metallothionein promoter express the gamma(1)34.5 gene constitutively and do not require induction by cadmium to complement the gamma(1)34.5- virus. One clonal cell line complements the gamma(1)34.5- virus only after induction by cadmium. These results are consistent with previous conclusions that the phenotype of premature shutoff of protein synthesis is associated with absence of the gamma(1)34.5 protein and indicate that the amounts of gamma(1)34.5 protein necessary to complement the gamma(1)34.5- viruses are small. We conclude that human cells differ in the manner in which they respond to the presence of stop codons. Shutoff of protein synthesis in HFF infected with the stop codon mutants could have been precluded by small amounts of gamma(1)34.5 protein produced by splicing out of an intron containing the stop codon, downstream initiation of translation, or tRNA suppression of the stop codon.

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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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