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. 1985 Jun;162(3):1212–1220. doi: 10.1128/jb.162.3.1212-1220.1985

Streptococcus faecalis sex pheromone (cAM373) also produced by Staphylococcus aureus and identification of a conjugative transposon (Tn918).

D B Clewell, F Y An, B A White, C Gawron-Burke
PMCID: PMC215906  PMID: 2987186

Abstract

Streptococcus faecalis RC73 was found to harbor a conjugative plasmid (pAM373) which confers a mating response to a sex pheromone (cAM373) excreted by plasmid-free members of the same species. The pheromone was also detected in culture filtrates of all of 23 Staphylococcus aureus strains but in only 2 of 22 coagulase negative staphylococcus strains. Streptococcus sanguis Challis and G9B also produced the activity, but 10 other Streptococcus sanguis strains did not. The activity was also produced by Streptococcus faecium 9790. A tetracycline resistance (Tc) determinant present in S. faecalis RC73 was not associated with pAM373 but served as a useful marker in efforts to identify pAM373 among other plasmids present in the strain. Analyses of the Tc determinant showed that it was located on a conjugative transposon very similar to Tn916. Designated Tn918, the transposon could insert into pAM373 as well as into two other hemolysin plasmids. Whereas pAM373 derivatives transferred very well between strains of Streptococcus faecalis, the plasmid would not establish in Staphylococcus aureus or Streptococcus sanguis. However, a derivative of pAM373 carrying Tn918 proved to be a useful delivery vehicle for generating transposon insertions into multiple sites on the staphylococcal chromosome.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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