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. 1975 Nov;124(2):641–649. doi: 10.1128/jb.124.2.641-649.1975

Plasmid incompatibility and control of replication: copy mutants of the R-factor R1 in Escherichia coli K-12.

B E Uhlin, K Nordström
PMCID: PMC235950  PMID: 1102525

Abstract

Plasmid incompatibility was studied in Escherichia coli K-12. By double-antibiotic selection, clones were constructed that carried the two R-factors R1 and R100, both belonging to the compatibility group FII. After release of the selection pressure, each of the two plasmids was lost at the same rate (8% per generation). Mutants of R-factor R1 showing an increased number of copies per chromosome (copy mutants) were tested for their incompatibility towards R-factor R100. The results indicate that plasmid incompatibility is quantitative and not just a qualitative property. All copy mutants studied affected incompatibility, and there were two classes of mutants: one increasing and one decreasing the incompatiblity exerted towards the test plasmid R100. Evidence is presented that incompatibility is related to the mechanisms that control replication. The implications of such a relation on proposed models for control of replication are discussed. The data do not support the hypothesis that plasmid incompatibility is due to competition for a replicational or segregational site.

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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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