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. 1975 Sep;123(3):792–805. doi: 10.1128/jb.123.3.792-805.1975

Behavior of a hybrid F' ts114 lac+, his+ factor (F42-400) in Klebsiella pneumoniae M5a1.

R N Rao, M G Pereira
PMCID: PMC235799  PMID: 1099077

Abstract

Episome F' ts114 lac+, his+ (F42-400) was transferred from Salmonella typhimurium to Klebsiella pneumoniae. From the progeny, a strain of K. pneumoniae able to retransfer the episome was obtained. The His+ phenotype in this strain is temperature sensitive. Escherichia coli female-specific phages phiII, W31, and T3 were shown to plate on K. pneumoniae. From phiII we obtained two derivatives; phiIIK, which plates only on K. pneumoniae, and phiIIE, which plates only on E. coli. Growth of phages T3 and phiIIK was inhibited by F42-400 in K. pneumoniae. Growth in presence of acridine orange in a defined medium at 40 C resulted in a high level of curing. The frequency of His+ cells after growth in acridine orange at 40 C was 0.001%. An extensive search to detect chromosome mobilization by F42-400 in K. pneumoniae, under different experimental conditions, was negative. We cannot exclude the possibility that the low transfer efficiencies prevented our detection of chromosome mobilization. A search among temperature-resistant, acridine orange-curing-resistant, or galactose-resistant derivatives of the K. pneumoniae donor strain failed to reveal any chromosome transfer. Our failure to detect Hfr's may be a result of: (i) the peculiarity of episome F42-400, (ii) the peculiarity of K. pneumoniae chromosome, or (iii) low transfer efficiency. K. pneumoniae-modified F42-400 and phage 424 were restricted by E. Coli K-12. E. coli K-12-modified episome F42-400 and phage 424 were restricted by K. pneumoniae. E. coli C failed to restrict F42-400 modified with K. pneumoniae specificity. The ability of K. pneumoniae to accept F42-400 is less, by about a factor of 50, than that of E. coli C. As an explanation for the differences in the behavior of E. coli C and K. pneumoniae in ability to receive F42-400 it was suggested that recipient bacteria have specific sites for interaction with the F-pilus tip; these are present in E. Coli C, leading to high transfer efficiency, whereas they may not be present (or if present, are not accessible) in K. pneumoniae, leading to low transfer efficiency.

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Selected References

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