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. 1974 Apr;13(4):847–857. doi: 10.1128/jvi.13.4.847-857.1974

Continued Synthesis of Bacterial DNA After Infection by Bacteriophage T4

Margaret S Scofield a,1, William L Collinsworth a, Christopher K Mathews a
PMCID: PMC355383  PMID: 4595300

Abstract

Early in infection by bacteriophage T4, before replication has commenced, one can detect the presence of newly synthesized DNA which cosediments with parental phage DNA on sucrose gradients. As shown earlier (R. E. Murray and C. K. Mathews, 1969), some of this represents covalent attachment of new material to parental phage DNA molecules. However, as shown herein, most of it is bacterial DNA, which is synthesized after infection and presumably degraded to T4 DNA-sized pieces. The small amount of phage-specific DNA synthesis which occurs is apparently a repair process, for its extent is greatly increased if the phage are irradiated with ultraviolet light prior to infection. Analysis by means of pulse labeling with [3H]thymidine and DNA-DNA hybridization shows that host DNA synthesis continues at a significant rate (40 to 80% of the preinfection rate) as late as 10 min after infection at 37 C. Very early in infection this is primarily replicative synthesis, but later a repair process predominates. Presumably this represents attempted repair of damage being inflicted on host DNA by phage-coded nucleases.

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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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