Identification of a new promoter for the response regulator rcsB expression in Salmonella enterica serovar Typhimurium.
The RcsCDB (Rcs) phosphorelay system regulates capsule synthesis, flagella production and other cellular activities in several enteric bacteria. This system consists of three proteins: the sensor RcsC, the cognate response regulator RcsB and the histidine-containing phosphotransfer protein RcsD (YojN), which is hypothesized to act as an intermediary in the phosphotransfer from RcsC to RcsB. The rcsC gene is convergently transcribed toward rcsB, which follows rcsD in what appears to be a two-gene operon. Here, it is reported that the overproduction of the rcsB gene represses rcsD transcription, but has a weak effect on its own expression. We demonstrated that the differential rcsD and rcsB expression is due to the activity of two promoters to transcribe the rcsB gene: (1) P(rcsDB) located upstream of rcsD and (2) P(rcsB) located within the rcsD coding region. In addition, here it was demonstrated that in Salmonella typhimurium, P(rcsB) is important to activate the rcsB expression during the stationary growth phase.
Departamento de Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas (Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de Tucumán) and Instituto de Química Biologica Dr. Bernabe Bloj, San Miguel de Tucumán, Tucumán, Argentina.
María de Las Mercedes
Mde L
Pescaretti
Roberto
R
Morero
Mónica A
MA
Delgado
D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D012486:Salmonella typhimurium / Q000235:genetics* / Q000502:physiology; D014158:Transcription, Genetic
D001426:Bacterial Proteins; C074889:RcsB protein, Bacteria