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. 1968 Nov;2(11):1262–1271. doi: 10.1128/jvi.2.11.1262-1271.1968

Inhibition of Host Protein Synthesis During Infection of Escherichia coli by Bacteriophage T4 I. Continued Synthesis of Host Ribonucleic Acid

David Kennell 1
PMCID: PMC375465  PMID: 4883015

Abstract

The ribonucleic acid (RNA) synthesized at specified intervals during infection of Escherichia coli K-12 by bacteriophage T4 was hybridized to denatured E. coli or T4 deoxyribonucleic acids (DNA). The reactions were performed under conditions that maximized the yield and at RNA/DNA inputs such that excess DNA sites were available for all RNA species. Most of the RNA synthesized at any time during the first 3 min of infection was host-specific. The fraction declined rapidly as infection progressed; host RNA represented about half that made between 3 and 4 min. It is unlikely that this represented RNA synthesized by bacteria that had escaped infection, as judged by the kinetics of adsorption and killing as well as by the rapid inhibition of β-galactosidase induction after infection. The nature of the host RNA was also examined. Part of the RNA synthesized during infection of cells rendered sensitive to actinomycin was stable in the presence of this inhibitor. This RNA was essentially all host-specific and it sedimented as ribosomal and transfer RNA; most of the ribosomal RNA was incorporated into 30S and 50S ribosomes. Hybridization analyses suggested that unstable E. coli messenger RNA was also synthesized for several minutes after infection; the proportion of unstable to stable host RNA synthesized appeared to be similar in infected and uninfected cells. Thus, it is concluded that significant amounts of E. coli RNA are synthesized during the first minutes of T4 infection. Host messenger RNA initiated after infection may not be translated into enzymes; alternatively, it is conceivable that continued bacterial messenger RNA synthesis only reflects the completion of transcription of operons whose reading was initiated prior to infection.

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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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