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. 1964 Feb;87(2):341–351. doi: 10.1128/jb.87.2.341-351.1964

EFFECT OF DRUG-RESISTANCE FACTOR R ON THE F PROPERTIES OF ESCHERICHIA COLI

Yukinori Hirota 1,2, Yukinobu Nishimura 1,2, Frits Ørskov 1,2, Ida Ørskov 1,2
PMCID: PMC277014  PMID: 14151055

Abstract

Hirota, Yukinori (Osaka University, Osaka, Japan), Yukinobu Nishimura, Frits Ørskov, and Ida Ørskov. Effect of drug-resistance factor R on the F properties of Escherichia coli. J. Bacteriol. 87:341–351. 1964.—Infection of Escherichia coli male cells (Hfr or F+) with resistance factor R results in the co-ordinate inhibition of several distinct functions of F factor: mating capacity to transfer chromosome by conjugation, production of f+ antigen, and formation of receptors for the male-specific bacteriophages, f1 and ribonucleic acid phage. The i− mutant (R100−1) of R factor, which was isolated from wild-type R factor (R100), shows no inhibition of these F properties. Male R+100−1 cells were autoagglutinable but the f+ antigen was still present. When R-infected female cells had acquired the ability to form recombinants with an F− strain, they also had become autoagglutinable. The question of the presence of f+ antigen in these strains was not solved. The cause of the autoagglutinability is not known, but it is not the result of loss of O antigen (rough autoagglutinability). Sensitivity to a phage tau, which can form plaques on female cells only, is not affected by the presence or absence of R factor. No difference in the pattern of segregation of recombinants was observed between the cross of Hfr R− × F− and that of Hfr R+ × F−. These results indicate that R factor controls a key mechanism in the synthesis of “F substances” formed on the cell surface by the F factor.

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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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