1887

Abstract

Two strains isolated from urinary tract infections were resistant to streptomycin, kanamycin, neomycin, tetracycline and sulphonamides. The strains also produced colicins B and M. The resistance to streptomycin, kanamycin and neomycin and the ability to produce colicins B and M could be transferred to an K12 recipient. Resistance and colicinogeny markers were transferred together by conjugation, and did not segregate even after interrupted mating or phage P1-mediated transduction. Hence, the drug-resistance and colicinogeny markers were carried by the same plasmid, designated as R. ColBM plasmid. The two R. ColBM plasmids were Fiand produced an F-like pilus. They belonged to the IncFIII incompatibility group, being thus the first R plasmids identified in this group. The two plasmids were isolated and their molecular sizes were determined by electrophoresis in agarose gels and by contour length measurements. Both methods showed that both plasmids were about 52 megadaltons.

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1980-08-01
2021-08-05
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