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. 1973 Nov;12(5):1078–1084. doi: 10.1128/jvi.12.5.1078-1084.1973

Synthesis of the Unusual DNA of Bacillus subtilis Bacteriophage SP-15

Simon Neubort a,1, Julius Marmur a
PMCID: PMC356739  PMID: 4203083

Abstract

Cultures of Bacillus subtilis infected with phage SP-15 were examined to investigate the metabolic origin of two of the unique components of the phage DNA: the component responsible for the unusually high buoyant density in CsCl and the unusual pyrimidine, 5-(4′, 5′-dihydroxypentyl) uracil (DHPU). Newly synthesized pulse-labeled DNA was light in buoyant density and shifted to the high density of mature phage DNA upon further incubation. Parental DNA was converted to a light-density intermediate form prior to replication. When labeled uracil, thymidine, or DHPU were added to infected cells, it was found that only uracil served as the precursor to DHPU and thymine in phage DNA. Analysis of the bases from hydrolyzed DNA of labeled phage or infected cells indicated that the uracil was incorporated into the DNA as such (presumably via deoxyuridine triphosphate) and later converted to DHPU and thymine at the macromolecular level. The sequence of events after phage infection appeared to be: (i) injection of parental DNA; (ii) conversion of parental DNA to a light form; (iii) DNA replication, yielding light DNA containing uracil; (iv) conversion of uracil to DHPU and thymine; and (v) addition of the heavy component.

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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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