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. 1978 May;75(5):2200–2204. doi: 10.1073/pnas.75.5.2200

Construction of a novel plasmid-phage hybrid: use of the hybrid to demonstrate ColE1 DNA replication in vivo in the absence of a ColE1-specified protein.

M Kahn, D R Helinski
PMCID: PMC392519  PMID: 276860

Abstract

A hybrid bacteriophage, P420, was constructed in vitro; it contains part of bacteriophage P4 and a 3.6-kilobase derivative of plasmid ColE1. In Escherichia coli, the plasmid-phage hybrid can exist as a stable plasmid or can be packaged into infective bacteriophage particles. Replication of P420, directed by the ColE1 replicon, was found to occur after P420 phage infection of E. coli cells that had been incubated in the presence of chloramphenicol. Replication began without a lag period and resulted in the synthesis of covalently closed circles of P420 DNA. Like ColE1 DNA replication but unlike that of P4, replication was dependent on DNA polymerase I and was sensitive to rifampicin. The presence of a resident ColE1 plasmid in the infected cells resulted in an inhibition of the replication of the incoming P420 DNA. These results indicate that ColE1 does not require a plasmid-coded protein to replicate its DNA in vivo and demonstrate the utility of P4 bacteriophage for coupling bacteriophage properties to a plasmid replicon.

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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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