@article{open2352,
          volume = {201},
          number = {12},
           month = {June},
          author = {Ritesh Rajesh Sevalkar and Divya Arora and Prabhat Ranjan Singh and Ranjeet Singh and Vinay K Nandicoori and Subramanian Karthikeyan and Dibyendu Sarkar},
            note = {Copyright of this article belongs to American Society for Microbiology.},
           title = {Functioning of Mycobacterial Heat Shock Repressors Requires the Master Virulence Regulator PhoP.},
       publisher = {American Society for Microbiology (ASM)},
            year = {2019},
         journal = {Journal of bacteriology},
        keywords = {M. tuberculosis PhoP; global regulation; heat shock repressors; heat shock response; protein-protein interactions},
             url = {http://crdd.osdd.net/open/2352/},
        abstract = {A hallmark feature of  pathogenesis lies in the ability of the pathogen to survive within macrophages under a stressful environment. Thus, coordinated regulation of stress proteins is critically important for an effective adaptive response of , the failure of which results in elevated immune recognition of the tubercle bacilli with reduced survival during chronic infections. Here, we show that virulence regulator PhoP impacts the global regulation of heat shock proteins, which protect  against stress generated by macrophages during infection. Our results identify that in addition to classical DNA-protein interactions, newly discovered protein-protein interactions control complex mechanisms of expression of heat shock proteins, an essential pathogenic determinant of  While the C-terminal domain of PhoP binds to its target promoters, the N-terminal domain of the regulator interacts with the C-terminal end of the heat shock repressors. Remarkably, our findings delineate a regulatory pathway which involves three major transcription factors, PhoP, HspR, and HrcA, that control  recruitment of the regulators within the target genes and regulate stress-specific expression of heat shock proteins via protein-protein interactions. The results have implications on the mechanism of regulation of PhoP-dependent stress response in  The regulation of heat shock proteins which protect  against stress generated by macrophages during infection is poorly understood. In this study, we show that PhoP, a virulence regulator of the tubercle bacilli, controls heat shock-responsive genes, an essential pathogenic determinant of  Our results unravel that in addition to classical DNA-protein interactions, complex mechanisms of regulation of heat shock-responsive genes occur through multiple protein-protein interactions. Together, these findings delineate a fundamental regulatory pathway where transcription factors PhoP, HspR, and HrcA interact with each other to control stress-specific expression of heat shock proteins.}
}