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The hemolysin (Hly/Bac) determinant in strains of Enterococcus faecalis was found to be present on plasmids in different incompatibility groups (conferring different sex pheromone responses) as well as on the chromosome. Of 33 Hly/Bac plasmids identified in clinical isolates, the related pheromone for 30 was cAD1; the related pheromone for another two (pYI1 and pYI3) or one (pYI2) was cOB1 or cY12, respectively. The representative Hly/Bac plasmids pAD1, pYI1, pOB1, and pYI2, which responded to pheromones cAD1, cOB1, cOB1, and cYI2, respectively, were compatible with one another. As additions to the incompatibility group IncHly of pAD1, groups for pOB1, pYI1, and pYI2 were designated IncHlyII, IncHlyIII, and IncHlyIV, respectively. Eleven of the 30 plasmids conferring a response to cAD1 were very similar to pAD1 on the basis of their restriction endonuclease profiles. EcoRI fragment D, F, or H containing parts of the Hly/Bac gene(s) of pAD1 hybridized to similar EcoRI fragments from each of the other three representatives of incompatibility groups (i.e., pOB1, pYI1, and pYI2) and to homologous DNA representing the chromosome of the plasmid-free Hly/Bac strain YI6-1.

journal of bacteriology

Evidence that the hemolysin/bacteriocin phenotype of Enterococcus faecalis subsp. zymogenes can be determined by plasmids in different incompatibility groups as well as by the chromosome