title: Pheromone-inducible expression of an aggregation protein in Enterococcus faecalis requires interaction of a plasmid-encoded RNA with components of the ribosome.
abstract: Transfer of the conjugative plasmid pCF10 from Enterococcus faecalis donor strains is induced by a peptide pheromone (cCF10) secreted by recipient cells. High-efficiency transfer requires expression of an aggregation protein (Asc10) encoded by the prgB gene and positively regulated by genes in a region 3-5 kb upstream, containing prgQ-R-S. Transcriptional fusion data reported here support the results of recent molecular analysis of the 5' ends of prgB transcripts which indicated that prgB transcription occurs by readthrough from the prgQ promoter. A 530-nucleotide prgQ-encoded RNA molecule (Q(L)) with rRNA-like domains is required for Asc10 production. Q(L) and cCF10 were found to interact with the L6 and S5 ribosomal proteins, respectively. Mutational analysis of Q(L) indicates that this RNA may also directly interact with 16S RNA. Q(L) is present in ribosomes translating the prgB message, and pheromone cCF10 may affect the association of this RNA with translation complexes. Results suggest that the positive regulatory molecules act post-transcriptionally on the polycistronic message and modify a ribosome population to enhance pheromone-induced translation of prgB.
authors.affiliation: Department of Microbiology and Institute for Advanced Studies in Biological Process Technology, University of Minnesota, Minneapolis 55455, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Bensing
authors.forename: G M
authors.initials: GM
authors.lastname: Dunny
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism*; D001483:Base Sequence; D002874:Chromosome Mapping; D013293:Enterococcus faecalis / Q000235:genetics* / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009842:Oligopeptides / Q000378:metabolism / Q000502:physiology; D010675:Pheromones / Q000378:metabolism / Q000502:physiology; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic; D021382:Protein Sorting Signals / Q000235:genetics; D012329:RNA, Bacterial / Q000235:genetics / Q000378:metabolism; D012335:RNA, Ribosomal / Q000235:genetics* / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000378:metabolism; D012269:Ribosomal Proteins / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D008565:Membrane Proteins; D009842:Oligopeptides; D010675:Pheromones; D021382:Protein Sorting Signals; D012329:RNA, Bacterial; D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D012269:Ribosomal Proteins; C090554:iCF10 peptide precursor, Plasmid pCF10; C057280:peptide pheromone cCF10; C031249:ribosomal protein L6; C030831:ribosomal protein S5; C071729:Asc10 protein, Enterococcus faecalis