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. 1970 Oct;6(4):430–437. doi: 10.1128/jvi.6.4.430-437.1970

Effect of Elevated Temperature on Deoxyribonucleic Acid Synthesis in Bacteriophage φ29-Infected Bacillus amyloliquefaciens

Charles F Schachtele 1, Robert W Oman 1, Dwight L Anderson 1
PMCID: PMC376140  PMID: 5497888

Abstract

Deoxyribonucleic acid (DNA) synthesis in bacteriophage φ29-infected Bacillus amyloliquefaciens was studied at 37 and 45 C. Infectious intracellular particles appear at the same time at both temperatures, but the average burst size is reduced 45 to 50% at 45 C. There is a transient inhibition of cellular mass increase at 45 C which is not observed at the lower temperature. In addition, the rate of host DNA synthesis is reduced and the onset of viral-specific DNA replication is delayed for 6 to 9 min at 45 C. These findings allowed us to screen phage φ29 mutants which are sensitive to growth at 45 C for their ability to synthesize φ29 DNA in the absence of host DNA replication. We obtained mutants which make no viral DNA, reduced levels of DNA, or normal quantities of DNA under nonpermissive conditions. Pulse-labeled viral DNA which sediments more rapidly than mature φ29 DNA molecules was observed after gentle cell lysis and zone sedimentation. This DNA is not a precursor of normally sedimenting φ29 DNA and apparently consists of mature φ29 DNA molecules aggregated with large pieces of bacterial DNA.

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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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