Sau3A-generated DNA fragments determining incompatibility functions of the plasmid RP4 were cloned on the vectors pTK16 and pBR322. Inc+ recombinant plasmids were divided into two types: 1) expressing incompatibility only towards the homologous RP4 replicon, 2) expressing incompatibility - both towards the homologous RP4 replicon and towards the heterologous replicons of plasmids R906 and R751. For one member of the first type plasmids it was shown that the cloned Inc+-specific insertion derived from the region of location of the EcoRI restriction site. The majority of the Inc+ recombinant plasmids showed asymmetric expression of incompatibility, predominantly eliminating the resident IncP plasmid.
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