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. 1976 Sep;127(3):1278–1285. doi: 10.1128/jb.127.3.1278-1285.1976

Recombination between plasmids of incompatibility groups P-1 and P-2.

G A Jacoby, A E Jacob, R W Hedges
PMCID: PMC232921  PMID: 821925

Abstract

R plasmids of incompatibility group P-2 are readily transmissible between Pseudomonas strains, but not to Escherichia coli or other enterobacteria, whereas those of group P-1 have a broad host range. Pseudomonas aeruginosa donor strains carrying both a P-1 plasmid (RP1, RP4, or R751) and a P-2 plasmid (pMG1, pMG2, pMG5, or RPL11) were mated with E. coli K-12, and selection was imposed for resistance markers on the P-2 plasmids. Transconjugants were obtained at a low frequency, in which P-2 markers were expressed and were serially transmissible in E. coli together with P-1 markers. These plasmids had P-1 incompatibility properties, conferred susceptibility to phages active on P-1 carrying strains, and behaved on sucrose gradient centrifugation as unimolecular species of higher molecular weights than the P-1 parent. Recombinant plasmid formation was independent of a functional Rec gene in both donor and recipient and, with R751, had a preferred site leading to loss of trimethoprim resistance. Interaction between insertion sequences may be involved. Thus, plasmids of group P-2 can recombine with R factors of another group quite separate in compatibility properties, host range, and pilus type. Formation of such recombinants provides one pathway by which the genetic diversity of plasmids may have evolved.

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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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