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. 1978 Jan;25(1):11–18. doi: 10.1128/jvi.25.1.11-18.1978

Inhibition of host protein synthesis in vaccinia virus-infected cells in the presence of cordycepin (3'-deoxyadenosine).

A Person, G Beaud
PMCID: PMC353895  PMID: 304489

Abstract

Cordycepin inhibited efficiently viral mRNA and polyadenylic acid syntheses in vaccinia virus-infected cells, but allowed the shutoff of host protein synthesis to occur. Therefore, cordycepin was used to study this shutoff in the absence of gene expression. Ribosome transit time was increased in infected cells, revealing an inhibition at the level of elongation and/or release of polypeptide chains. However, the disappearance of heavy polysomes in vaccinia virus-infected cells showed that the inhibition of host protein synthesis resulted predominantly from a block at the stage of initiation. This conclusion was confirmed by the recovery of heavy polyribosomes when low levels of cycloheximide were added to slow down ribosome release from the mRNA. Similar amounts of cellular mRNA (present in the polyribosomes) were found in vaccinia virus-infected cells and in mock-infected cels (exposed to cordycepin), showing that the cellular mRNA was not inactivated in these conditions. It was concluded that a component of the vaccinia virion inhibits, in the absence of viral RNA and polyadenylic acid syntheses, host protein synthesis at the level of initiation and, to a lesser extent, at the level of elongation (and/or release) of polypeptide chains.

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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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