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The Rip1 protease of Mycobacterium tuberculosis controls the SigD regulon.


ABSTRACT: Regulated intramembrane proteolysis of membrane-embedded substrates by site-2 proteases (S2Ps) is a widespread mechanism of transmembrane signal transduction in bacteria and bacterial pathogens. We previously demonstrated that the Mycobacterium tuberculosis S2P Rip1 is required for full virulence in the mouse model of infection. Rip1 controls transcription in part through proteolysis of three transmembrane anti-sigma factors, anti-SigK, -L, and -M, but there are also Rip1-dependent, SigKLM-independent pathways. To determine the contribution of the sigma factors K, L, and M to the ?rip1 attenuation phenotype, we constructed an M. tuberculosis ?sigK? sigL ?sigM mutant and found that this strain fails to recapitulate the marked attenuation of ?rip1 in mice. In a search for additional pathways controlled by Rip1, we demonstrated that the SigD regulon is positively regulated by the Rip1 pathway. Rip1 cleavage of transmembrane anti-SigD is required for expression of SigD target genes. In the absence of Rip1, proteolytic maturation of RsdA is impaired. These findings identify RsdA/SigD as a fourth arm of the branched pathway controlled by Rip1 in M. tuberculosis.

SUBMITTER: Schneider JS 

PROVIDER: S-EPMC4097585 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature

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The Rip1 protease of Mycobacterium tuberculosis controls the SigD regulon.

Schneider Jessica S JS   Sklar Joseph G JG   Glickman Michael S MS  

Journal of bacteriology 20140509 14


Regulated intramembrane proteolysis of membrane-embedded substrates by site-2 proteases (S2Ps) is a widespread mechanism of transmembrane signal transduction in bacteria and bacterial pathogens. We previously demonstrated that the Mycobacterium tuberculosis S2P Rip1 is required for full virulence in the mouse model of infection. Rip1 controls transcription in part through proteolysis of three transmembrane anti-sigma factors, anti-SigK, -L, and -M, but there are also Rip1-dependent, SigKLM-indep  ...[more]

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