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Expression of incompatibility by derivatives of the broad host-range inc P-1 plasmid RK2

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Summary

A segment of DNA encoding incompatibility on the inc P-1 plasmid pRK248 was identified by the analysis of deletions generated in vitro, and then cloned into several unrelated and mutually compatible plasmids. These derivatives were tested for expression of P-1 incompatibility. It was demonstrated by transformation experiments that P-1 plasmids were efficiently eliminated from an E. coli host following introduction of any one of the derivatives. However, all the derivatives were compatible with each other. The cloned segment of pRK248 DNA is itself capable of autonomous replication, without being cloned into any plasmid, if plasmid-specified gene products are provided in trans. This satellite plasmid is eliminated from the cell by the inc P-1 plasmid pRK286. The results argue against a partitioning mechanism as the basis for P-1 incompatibility but are consistent with incompatibility being the consequence of negative regulation of copy number. For the inc P-1 system, susceptibility of the plasmid to elimination, but not its ability to eliminate, requires that the P-1 replication system is active.

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  1. Microbiology Department, University of Texas, 78712, Austin, Texas, USA

    Richard J. Meyer

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  1. Richard J. Meyer
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Communicated by H.W. Boyer

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Meyer, R.J. Expression of incompatibility by derivatives of the broad host-range inc P-1 plasmid RK2. Molec. Gen. Genet. 177, 155–161 (1979). https://doi.org/10.1007/BF00267265

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  • DOI: https://doi.org/10.1007/BF00267265

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