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. 1968 Oct;2(10):1006–1015. doi: 10.1128/jvi.2.10.1006-1015.1968

Deoxyribonucleic Acid Synthesis in FV-3-infected Mammalian Cells

B R McAuslan a,1, W R Smith b
PMCID: PMC375431  PMID: 5749374

Abstract

Deoxyribonucleic acid (DNA) synthesis and virus growth in frog virus 3 (FV-3)-infected mammalian cells in suspension were examined. The kinetics of thymidine incorporation into DNA was followed by fractionating infected cells. The cell fractionation procedure separated replicating viral DNA from matured virus. Incorporation of isotope into the nuclear fraction was depressed 2 to 3 hr postinfection; this inhibition did not require protein synthesis. About 3 to 4 hr postinfection, there was an increase in thymidine incorporation into both nuclear and cytoplasmic fractions. The nuclear-associating DNA had a guanine plus cytosine (GC) content of 52%; unlike host DNA it was synthesized in the presence of mitomycin C, it could be removed from nuclei by centrifugation through sucrose, and it was susceptible to nuclease digestion. This nuclear-associating DNA appeared to be a precursor of cytoplasmic DNA of infected cells. The formation of the latter DNA class could be selectively inhibited by conditions (infection at 37 C or inhibition of protein synthesis) that permit continued incorporation of thymidine into nuclear-associating DNA. The cytoplasmic DNA class also had a GC content of 52%, was resistant to nuclease degradation, and its sedimentation profile in sucrose gradients corresponded to that of infective virus. Contrary to previous reports, we found that (i) viral DNA synthesis can continue in the absence of concomitant protein synthesis, and (ii) viral DNA synthesis is not abolished at 37 C. The temperature lesion in FV-3 replication appeared to be in the packaging of DNA into the form that appears in the cytoplasmic fraction of disrupted cells.

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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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