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The pheromone-responding conjugative bacteriocin plasmid pPD1 (59 kb) of Enterococcus faecalis was mapped physically by using a relational clone approach, and transposon analysis with Tn917 (Emr) or Tn916 (Tcr) facilitated the location of the bacteriocin-related genes in a segment of about 6.7 kb. Tn917 insertions within a 3-kb region resulted in constitutive clumping. The nucleotide sequence of the region that included the insertions giving rise to constitutive clumping was determined. The region of pPD1 spanned about 8 kb and was found to contain a number of open reading frames, some of which were named on the basis of homologies with two other pheromone-responding plasmids, pAD1 and pCF10. The genes were arranged in the sequence repB-repA-traC-traB-traA-ipd-traE-traF- orfY-sea-1 with all but repB and traA oriented in the same (left-to-right) direction. traC and traB corresponded, respectively, to traC and traB of pAD1 and to prgY and prgZ of pCF10.

journal of bacteriology

Physical mapping of the conjugative bacteriocin plasmid pPD1 of Enterococcus faecalis and identification of the determinant related to the pheromone response