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. 1979 Oct;32(1):61–71. doi: 10.1128/jvi.32.1.61-71.1979

Adenovirus early function required for protection of viral and cellular DNA.

J C D'Halluin, C Allart, C Cousin, P A Boulanger, G R Martin
PMCID: PMC353527  PMID: 232188

Abstract

Studies were done to characterize a DNA-negative temperature-sensitive (ts) mutant of human adenovirus type 2, H2 ts111. The temperature-sensitive defect, which was reversible on shift-down in the absence of protein synthesis, was expressed as early as 2 h postinfection, and the results of density-labeling experiments are in agreement with at least a DNA replication initiation block. On shift-up, after allowing viral DNA synthesis at permissive temperatures, the newly synthesized viral DNA and the mature viral DNA were cleaved into fragments which sedimented as a broad peak with a mean coefficient of 10-12S. This cleavage was more marked in the presence of hydroxyurea as the DNA synthesis inhibitor. Parental DNA in infected cells was degraded to a much lesser extent regardless of the incubation temperature. In contrast, the parental DNA was strongly degraded when early gene expression was permitted at 33 degrees C before shift-up to 39.5 degrees C. Furthermore, cellular DNA was also degraded at 39.5 degrees C in ts111-infected cells, the rate of cleavage being related to the multiplicity of infection. This cleavage effect, which did not seem to be related to penton base-associated endonuclease activity, was also enhanced when early gene expression was allowed at 33 degrees C before shift-up. The ts111 defect, which was related to an initiation block and endonucleolytic cleavage of viral and cellular DNA, seemed to correspond to a single mutation. The implication of the ts111 gene product in protection of viral and cellular DNA by way of a DNase-inhibitory function is discussed.

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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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