The phage-shock protein (Psp) response is an extracytoplasmic response system that is vital for maintenance of the cytoplasmic membrane when the cell encounters stressful conditions. The paradigm of the Psp response has been established in . The response has been shown to be important for survival during the stationary phase, maintenance of the proton motive force across membranes and implicated in virulence. In this study, we identified a putative PspA homologue in , annotated as BPSL2105. Similar to the induction of PspA in , the expression of was induced by heat shock. Deletion of resulted in a survival defect in the late stationary phase coincident with dramatic changes in the pH of the culture medium. The deletion mutant also displayed reduced survival in macrophage infection – the first indication that the Psp response plays a role during intracellular pathogenesis in this species. The purified protein formed large oligomeric structures similar to those observed for the PspA protein of , and PspA homologues in , cyanobacteria and higher plants, providing further evidence to support the identification of BPSL2105 as a PspA-like protein in .


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