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. 1987 Oct;55(10):2483–2489. doi: 10.1128/iai.55.10.2483-2489.1987

Influences of conjugal genetic transfer functions of colicin V plasmids on adhesion of Escherichia coli to murine intestinal tissue.

J Darken 1, D C Savage 1
PMCID: PMC260734  PMID: 2888734

Abstract

Cells of strains of Escherichia coli K-12 291 bearing one of three colicin V plasmids, pF54, pH247, or pF70, were tested in comparison with cells of strain 291 for their ability to adhere to murine intestinal tissue in vitro. The plasmids were either repressed or derepressed in conjugal genetic transfer functions. The strains bearing pF54 and pH247 repressed in transfer functions (pColVF54 luminal diameter r and pColVH247 luminal diameter r) adhered in higher numbers to the murine tissue than did the host strain lacking the plasmid or the strains containing the plasmids with active transfer functions (pColVF54drd and pColVH247drd). The number of cells (CFU) of strain 291(pColVF54 luminal diameter r) adherent to the tissue was related directly to the time of incubation (up to 30 min) and to the number of cells (CFU) to which the tissues were exposed. As indicated by tests for sensitivity to F factor (F)-pilus-specific bacteriophages, the cells of strains bearing the plasmids derepressed for conjugal functions had F pili on their surfaces, while such structures were missing from cells of the parental strain (291) and the strains containing the plasmids in repressed form. This finding was supported by transmission electron microscopy of cells of strain 291, 291(pColVF54 luminal diameter r), and 291(pColVF54drd). F pili could be seen on cells of the latter strain but not on those of the parental strain or the strain bearing pColVF54 luminal diameter r. Pili other than F pili were not seen on cells of the strains bearing pF54 in either form. Strains 291(pColVF70drd) and 291(pColVF70 luminal diameter r) adhered to the tissues in numbers comparable to those of strain 291. Nevertheless, these findings are further evidence that for certain colicin V plasmids (A. M. Nilius and D. C. Savage, Infect. Immun. 43:947-953, 1984), conjugal genetic transfer functions influence properties that may be important in the pathogenesis of invasive E. coli strains.

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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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