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Genetic analysis of the inter-relationship between plasmid replication and incompatibility

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Summary

The relationship between replication control and plasmid incompatibility has been investigated using a composite replicon, pPM1, which consists of the pSC101 plasmid ligated to another small multicopy plasmid, RSF1050. Since pPM1 can utilise the replication system of either of the two functionally distinct components, propagation of the composite plasmid can occur in the presence of a mutation of one of its moieties. Such mutants are detected by their inability to rescue the composite plasmid under conditions not permissive for replication of the other moiety. Mutations in incompatibility functions can be detected by the failure of the composite replicon to exclude co-existing plasmids carrying a replication system identical to the one on pPM1.

The inability of the composite plasmid to replicate at 42° in a host synthesizing temperature-sensitive DNA polymerase I, which is required by the RSF1050 replication system, was used to isolate pPM1 mutants defective in replication of the pSC101 component. Mutants defective in the incompatibility functions of pSC101 were obtained by selecting derivatives that allow the stable coexistence of a second pSC101 replicon in the same cell. Analysis of these two classes of mutants indicates that plasmids selected for defective pSC101 replication ability nevertheless retain pSC101 incompatibility. In contrast, plasmid mutants that have lost incompatibility functions were found always to be defective in replication ability.

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Authors and Affiliations

  1. Department of Genetics, Stanford University School of Medicine, 94305, Stanford, California, USA

    Peter A. Meacock & Stanley N. Cohen

  2. Department of Medicine, Stanford University School of Medicine, 94305, Stanford, California, USA

    Peter A. Meacock & Stanley N. Cohen

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  1. Peter A. Meacock
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  2. Stanley N. Cohen
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Communicated by H.W. Boyer

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Meacock, P.A., Cohen, S.N. Genetic analysis of the inter-relationship between plasmid replication and incompatibility. Molec. Gen. Genet. 174, 135–147 (1979). https://doi.org/10.1007/BF00268351

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  • DOI: https://doi.org/10.1007/BF00268351

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