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A procedure is described for the isolation, in Pseudomonas aeruginosa PAO, of bacteria carrying derivatives of pVS1 that inherited the carbenicillin-resistance determinant from RP1 either alone or together with that for aeruginocin resistance. Such bacteria occur among the transconjugant progeny from both recombination-proficient or -deficient pVS1+ RP1+ donors, suggesting that the formation of these plasmids is due to the translocation of TnA from RP1 into pVS1. It is possible, therefore, that the aeruginocin-resistance determinant is part of TnA or is closely linked to it. Unexpectedly, none of these plasmids showed the 3 x 10(6)- to 4 x 10(6)-dalton increase in size predicted for TnA+ derivatives of PVS1. It is suggested that an interaction between TnA and the Tn501 translocation unit in pVS1 could account for this result.

Properties of derivatives of the Pseudomonas plasmid pVS1 that have inherited carbenicillin resistance from RP1