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. 1973 Jun;11(6):862–871. doi: 10.1128/jvi.11.6.862-871.1973

Role of Gene 52 in Bacteriophage T4 DNA Synthesis

Yehudith Naot 1, Channa Shalitin 1
PMCID: PMC355193  PMID: 4576517

Abstract

In an attempt to elucidate the mechanism of delayed DNA synthesis in phage T4, Escherichia coli B cells were infected with H17 (an amber mutant defective in gene 52 possessing a “DNA-delay” phenotype). The fate of 14C-labeled H17 parental DNA after infection was followed: we could show that this DNA sediments more slowly in neutral sucrose than wild-type DNA 3 min postinfection. In pulse-chase experiments progeny DNA was found to undergo detachment from the membrane at 12 min postinfection. Reattachment to the membrane was found to be related to an increase in rate of DNA synthesis. A nucleolytic activity that is absent from cells infected by wild-type phage and from uninfected cells could be detected in extracts prepared from mutant-infected cells. In contrast, degradation of host DNA was found to be less extensive in am H17 compared with wild-type infected cells. Addition of chloramphenicol to mutant-infected cells 10 min postinfection inhibited the appearance of a nuclease activity on one hand and suppressed the “DNA-delay” phenotype on the other hand. We conclude that the gene 52 product controls the activity of a nuclease in infected cells whose main function may be specific strand nicking in association with DNA replication. This gene product might directly attack both E. coli and phage T4 DNA, or indirectly determine their sensitivity to degradation by another nuclease.

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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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