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. 1973 Aug;12(2):310–319. doi: 10.1128/jvi.12.2.310-319.1973

Host-Mediated Repair of Discontinuities in DNA From T4 Bacteriophage

K Carlson a,1, Z K Lorkiewicz a, A W Kozinski a
PMCID: PMC356625  PMID: 4583887

Abstract

Discontinuities of T4 DNA which are caused by excision of UV-damaged areas, by decay of 32P atoms, or which are present in DNA from rII-ligam- phage produced in a host nonpermissive for amber mutants are all repaired by bacterial enzymes after infection in the presence of chloramphenicol. Escherichia coli DNA polymerase I participates in the host-mediated repair, but an approximately 20-fold variation in the levels of host polynucleotide ligase does not affect either the kinetics or the extent of repair observed. Upon removal of chloramphenicol, host-repaired DNA from UV-irradiated phage undergoes a secondary cycle of breakage, which ultimately results in solubilization of most of the phage DNA. If the cells are co-infected with nonirradiated helper phage, the secondary breaks are repaired and the continuity of the polynucleotide chain is restored. The close coincidence in the extent of primary and secondary breakage suggests that phage-coded enzymes recognize and excise areas improperly repaired by the host. In contrast to host-mediated repair, repair mediated by rescuing phage probably restored functionality to the damaged 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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