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. 1981 Apr;41(4):959–966. doi: 10.1128/aem.41.4.959-966.1981

R-Plasmid Transfer to and from Escherichia coli Strains Isolated from Human Fecal Samples

T L Corliss 1, P S Cohen 1, V J Cabelli 1
PMCID: PMC243841  PMID: 16345759

Abstract

Strains of Escherichia coli recently isolated from human feces were examined for the frequency with which they accept an R factor (R1) from a derepressed fi+ strain of E. coli K-12 and transfer it to fecal and laboratory strains. Colicins produced by some of the isolates rapidly killed the other half of the mating pair; therefore, conjugation was conducted by a membrane filtration procedure whereby this effect was minimized. The majority of fecal E. coli isolates accepted the R factor at lower frequencies than K-12 F−, varying from 10−2 per donor cell to undetectable levels. The frequencies with which certain fecal recipients received the R-plasmid were increased when its R+ transconjugant was either cured of the R1-plasmid and remated with the fi+ strain or backcrossed into the parental strain. The former suggests the loss of an incompatibility plasmid, and the latter suggests the modification of the R1-plasmid deoxyribonucleic acid (DNA). In general, the fecal R+E. coli transconjugants were less effective donors for K-12 F− and heterologous fecal strains than was the fi+ K-12 strain, whereas the single strain of Citrobacter freundii examined was generally more competent. Passage of the R1-plasmid to strains of salmonellae reached mating frequencies of 10−1 per donor cell when the recipient was a Salmonella typhi previously cured of its resident R-plasmid. However, two recently isolated strains of Salmonella accepted the R1-plasmid from E. coli K-12 R+ or the R+E. coli transconjugants at frequencies of 5 × 10−7 or less.

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Selected References

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