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. 1986 Apr;166(1):15–19. doi: 10.1128/jb.166.1.15-19.1986

Physical and genetic analysis of the ColD plasmid.

J Frey, P Ghersa, P G Palacios, M Belet
PMCID: PMC214549  PMID: 3007432

Abstract

The plasmid ColD-CA23, a high-copy-number plasmid of 5.12 kilobases, encodes colicin D, a protein of approximately 87,000 daltons which inhibits bacterial protein synthesis. Colicin D production is under the control of the Escherichia coli SOS regulatory system and is released to the growth medium via the action of the lysis gene product(s). A detailed map of the ColD plasmid was established for 10 restriction enzymes. Using in vitro insertional omega mutagenesis and in vivo insertional Tn5 mutagenesis, we localized the regions of the plasmid responsible for colicin D activity (cda), for mitomycin C-induced lysis (cdl), and for colicin D immunity (cdi). These genes were all located contiguously on a 2,400-base-pair fragment similar to a large number of other Col plasmids (A, E1, E2, E3, E8, N, and CloDF). The ColD plasmid was mobilizable by conjugative transfer by helper plasmids of the IncFII incompatibility group, but not by plasmids belonging to the groups IncI-alpha or IncP. The location of the mobilization functions was determined by deletion analysis. The plasmid needs a segment of 400 base pairs, which is located between the mob genes and the gene for autolysis, for its replication.

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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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