The phosphorelay BarA/SirA activates the non-cognate regulator RcsB in Salmonella enterica


Autoři: Hubert Salvail aff001;  Eduardo A. Groisman aff001
Působiště autorů: Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, Connecticut, United States of America aff001;  Yale Microbial Sciences Institute, West Haven, Connecticut, United States of America aff002
Vyšlo v časopise: The phosphorelay BarA/SirA activates the non-cognate regulator RcsB in Salmonella enterica. PLoS Genet 16(5): e32767. doi:10.1371/journal.pgen.1008722
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008722

Souhrn

To survive an environmental stress, organisms must detect the stress and mount an appropriate response. One way that bacteria do so is by phosphorelay systems that respond to a stress by activating a regulator that modifies gene expression. To ensure an appropriate response, a given regulator is typically activated solely by its cognate phosphorelay protein(s). However, we now report that the regulator RcsB is activated by both cognate and non-cognate phosphorelay proteins, depending on the condition experienced by the bacterium Salmonella enterica serovar Typhimurium. The RcsC and RcsD proteins form a phosphorelay that activates their cognate regulator RcsB in response to outer membrane stress and cell wall perturbations, conditions Salmonella experiences during infection. Surprisingly, the non-cognate phosphorelay protein BarA activates RcsB during logarithmic growth in Luria-Bertani medium in three ways. That is, BarA’s cognate regulator SirA promotes transcription of the rcsDB operon; the SirA-dependent regulatory RNAs CsrB and CsrC further increase RcsB-activated gene transcription; and BarA activates RcsB independently of the RcsC, RcsD, and SirA proteins. Activation of a regulator by multiple sensors broadens the spectrum of environments in which a set of genes is expressed without evolving binding sites for different regulators at each of these genes.

Klíčová slova:

Gene expression – Outer membrane proteins – Phosphorylation – Plasmid construction – Prisms – Regulator genes – Salmonella – Isomorphous replacement


Zdroje

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