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. 1983 Aug;155(2):704–713. doi: 10.1128/jb.155.2.704-713.1983

Conditionally replicating plasmid vectors that can integrate into the Klebsiella pneumoniae chromosome via bacteriophage P4 site-specific recombination.

D W Ow, F M Ausubel
PMCID: PMC217740  PMID: 6307977

Abstract

P4 is a satellite phage of P2 and is dependent on phage P2 gene products for virion assembly and cell lysis. Previously, we showed that a virulent mutant of phage P4 (P4 vir1) could be used as a multicopy, autonomously replicating plasmid vector in Escherichia coli and Klebsiella pneumoniae in the absence of the P2 helper. In addition to establishing lysogeny as a self-replicating plasmid, it has been shown that P4 can also lysogenize E. coli via site-specific integration into the host chromosome. In this study, we show that P4 also integrates into the K. pneumoniae chromosome at a specific site. In contrast to that in E. coli, however, site-specific integration in K. pneumoniae does not require the int gene of P4. We utilized the alternative modes of P4 lysogenization (plasmid replication or integration) to construct cloning vectors derived from P4 vir1 that could exist in either lysogenic mode, depending on the host strain used. These vectors carry an amber mutation in the DNA primase gene alpha, which blocks DNA replication in an Su- host and allows the selection of lysogenic strains with integrated prophages. In contrast, these vectors can be propagated as plasmids in an Su+ host where replication is allowed. To demonstrate the utility of this type of vector, we show that certain nitrogen fixation (nif) genes of K. pneumoniae, which otherwise inhibit nif gene expression when present on multicopy plasmids, do not exhibit inhibitory effects when introduced as merodiploids via P4 site-specific integration.

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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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