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Plasmids belonging to the three HI plasmid incompatibility subgroups were characterized by the use of restriction enzymes and Southern transfer hybridization. A diversity of restriction enzyme patterns was noted among the HI subgroups, and a small amount of DNA homology was observed by probing these digests with a nick-translated HI1 plasmid. Within a single subgroup (HI1 and HI2), similar restriction enzyme patterns were noted. Plasmids of all three HI subgroups and the HII group had a guanine plus cytosine content of 49 to 50 mol%. The IncHII plasmid pHH1508a also showed some homology with the HI1 probe. The DNA homology observed is probably responsible for common phenotypic properties encoded by these plasmids.

Identification of DNA homologies among H incompatibility group plasmids by restriction enzyme digestion and Southern transfer hybridization