title: Countertranscript-driven attenuation system of the pAM beta 1 repE gene.
abstract: The plasmid-encoded RepE protein is absolutely essential and rate-limiting for replication of the promiscuous plasmid pAM beta 1 originating from Enterococcus faecalis. We previously showed that the rep gene is transcribed from a promoter that is negatively regulated (approximately 10-fold reduction) by the CopF repressor. In this report, we show that this transcription is decreased a further approximately 10-times by a countertranscript-driven transcriptional attenuation system. Extensive mutagenesis revealed that this system operates by a mechanism similar to that previously described for the unrelated repC gene of plasmid pT181.
authors.affiliation: Laboratoire de Génétique Microbienne, Institut National de la Recherche Agronomique, Jouy en Josas, France.
authors.forename: E
authors.initials: E
authors.lastname: Le Chatelier
authors.forename: S D
authors.initials: SD
authors.lastname: Ehrlich
authors.forename: L
authors.initials: L
authors.lastname: Jannière
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D013293:Enterococcus faecalis / Q000235:genetics*; D029968:Escherichia coli Proteins; D018628:Gene Dosage; D015964:Gene Expression Regulation, Bacterial; D016296:Mutagenesis; D009690:Nucleic Acid Conformation; D010957:Plasmids; D011401:Promoter Regions, Genetic; D012329:RNA, Bacterial; D012097:Repressor Proteins / Q000235:genetics*; D015398:Signal Transduction / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D012329:RNA, Bacterial; C074164:RepE protein, E coli; D012097:Repressor Proteins