The Rip1 protease of mycobacterium tuberculosis controls the SigD regulon Journal Article
| Authors: | Schneider, J. S.; Sklar, J. G.; Glickman, M. S. |
| Article Title: | 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 Δrip1 attenuation phenotype, we constructed an M. tuberculosis ΔsigKΔ sigL ΔsigM mutant and found that this strain fails to recapitulate the marked attenuation of Δrip1 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. © 2014, American Society for Microbiology. |
| Keywords: | signal transduction; unclassified drug; nonhuman; genetic analysis; mouse; phenotype; animal tissue; gene expression; protein degradation; animal experiment; alkaline phosphatase; mycobacterium tuberculosis; western blotting; immunoblotting; cytoplasm; proteinase; mycobacterium smegmatis; bacterial growth; colony forming unit; southern blotting; sigma factor; regulon; bacterial load; priority journal; article; rip1 proteinase |
| Journal Title: | Journal of Bacteriology |
| Volume: | 196 |
| Issue: | 14 |
| ISSN: | 0021-9193 |
| Publisher: | American Society for Microbiology |
| Date Published: | 2014-07-15 |
| Start Page: | 2638 |
| End Page: | 2645 |
| Language: | English |
| DOI: | 10.1128/jb.01537-14 |
| PROVIDER: | scopus |
| PMCID: | PMC4097585 |
| PUBMED: | 24816608 |
| DOI/URL: | |
| Notes: | Export Date: 1 August 2014 -- CODEN: JOBAA -- Source: Scopus |
Altmetric
Citation Impact
BMJ Impact Analytics
Related MSK Work