A novel insight on signal transduction mechanism of RcsCDB system in Salmonella enterica serovar Typhimurium

 

Autores
Pescaretti, María de Las Mercedes; Farizano, Juan Vicente; Morero, Roberto Dionisio; Delgado, Monica Alejandra
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2013
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
The RcsCDB system of Salmonella enterica serovar Typhimurium is implicated in the control of capsule and flagella synthesis. The hybrid sensor RcsC, the phosphotransferase RcsD and the regulator RcsB, constitute the main components of the RcsCDB system. The proposed Rcs signaling cascade involves the autophosphorylation of RcsC and the transfer of the phosphate group to RcsB, mediated by RcsD. We previously reported that the overexpression of rcsB repress the transcription of rcsD by an autoregulation mechanism. Moreover, we demonstrated that during the rcsD repression, the RcsB-dependent flagellar modulation remained active. These results suggest that the Rcs phosphorelay mechanism occurs even in the absence of RcsD. In this work, we established the existence of two alternative phosphorelay pathways driving activation of this system. We demonstrated that RcsC and RcsD can act as histidine kinase proteins which, after autophosphorylated, are able to independently transfer the phosphate to RcsB. Our results suggest that these pathways could be activated by different environmental signals, leading different levels of RcsB-phosphorylated to produce a differential gene modulation. These findings contribute to a better understanding of the complexity and importance of the Rcs system activation, where more than one phosphate flow pathway increases the possibilities to exert gene regulation for a quick environmental changes response.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/4304
Enlace del recurso
http://hdl.handle.net/11336/4304
Nivel de acceso
Acceso abierto
Materia
SALMONELLA
RCS SYSTEM
GENE REGULATION
VIRULENCE
Bioquímica y Biología Molecular
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS