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Transfer and properties of some natural and suicide replicons in Pasteurella multocida.

We tested the transfer of several plasmids and transposons from Escherichia coli to Pasteurella multocida by filter mating. Two plasmids, pRKTV5 (pRK2013::Tn7) and pUW964 (pRKTV5::Tn5), were derived from pRK2013--a narrow-host-range plasmid with the broad-host-range IncP conjugation genes. Most P. multocida transconjugants obtained with pRKTV5 had Tn7 insertions in the chromosome but some had insertions of the whole plasmid. By contrast, all the transconjugants obtained with pUW964 had insertions of this plasmid or a deleted variant. pUW964 mediated low-frequency transfer of Tn7 or chromosomal markers between P. multocida strains. Broad-host-range IncP plasmid RP4 (RK2) did not yield selectable transconjugants in P. multocida but two plasmids derived by Tn5 insertion into a kanamycin-sensitive derivative of RP4 did yield transconjugants. pSUP1011, a narrow-host-range p15A replicon with the RP4 mob region allowing mobilization by the IncP conjugation genes also yielded transconjugants while several other plasmids tested did not transfer markers to P. multocida.