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

By S Fujimoto, H Tomita, E Wakamatsu, K Tanimoto and Y Ike


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

Topics: Research Article
Year: 1995
DOI identifier: 10.1128/jb.177.19.5574-5581.1995
OAI identifier:
Provided by: PubMed Central
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