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The haemolytic plasmid pSU316 is incompatible with members of the IncFIII and IncFIV incompatibility groups. Plasmid pSU307 (pSU316 hlyC::Tn5) was inserted by integrative suppression into the chromosome of JW112, a temperature-sensitive dnaA mutant of Escherichia coli. The incompatibility properties of this strain (SU51) were studied and it was found that: (1) plasmid pSU306 (pSU316 hlyA::Tn802) was rapidly lost from strain SU51 both at 30 degrees C and 42 degrees C; (2) the IncFIII plasmid pSU397 (ColB-K98::Tn802) was lost from strain SU51 and at 42 degrees C but not at 30 degrees C; and (3) the IncFIV plasmid R124 was stably maintained in strain SU51 at both temperatures. Revertants of pSU307 to the autonomous state could be obtained from SU51. These revertants exerted incompatibility towards the prototype plasmids pSU306, pSU397 and R124 in the same way as pSU307 itself. Thus, strain SU51 provided a suitable method for distinguishing the three different incompatibility determinants of plasmid pSU316.

Incompatibility Properties of the IncFIII/FIV Haemolytic Plasmid pSU316 when Integrated in the Escherichia coli Chromosome