A Serine/threonine kinase PknL , is involved in the adaptive response of Mycobacterium tuberculosis
Open accessAbstract
Mycobacterium tuberculosis adapts itself to various environmental stress conditions to thrive inside the phagosome for establishing a chronic infection. Serine/threonine protein kinases (STPKs) play a major role in the physiology and pathogenesis of Mycobacterium tuberculosis. Some of these STPKs are involved in regulating the growth of the mycobacterium under nutrient stress and starvation conditions. In this study, we have investigated the role of PknL, a STPK in the adaptive responses of M. tuberculosis by conditional inactivation of the gene using antisense technology. The inhibition of PknL in the knockdown strain was validated by RT-PCR. The in vitro growth kinetics of M. tuberculosis strain following inhibition of PknL was found to be bacteriostatic. The knock down strain of PknL exhibited a better survival in pH 5.5 when compared to its growth in pH 7.0. Similarly, it also exhibited more resistance to both SDS(0.01%) and Lysozyme stress (2.5mg/ml), indicating that loss of PknL enhances the growth of mycobacterium under stress conditions. SEM pictographs also represent an increase in the cell length of the knock down strain compared to Wild type stressing its role in cellular integrity. Lastly, the proteome analysis of differentially expressing PknL strains by 2D gel electrophoresis and mass spectrometry identified 19 differentially expressed proteins. Our findings have shown that PknL plays an important role in sensing the host environment and adapting itself in slowing down the growth of the pathogen and persisting within the host.
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As these STPKs are associated with stasis conditions, their phosphorylation of FAS-II enzymes reduces mycolic acid synthesis during stasis and chronic phases of infection.
“As these STPKs are associated with stasis conditions14,72,94,95, we predict that their phosphorylation of FAS-II enzymes reduces mycolic acid synthesis during stasis and chronic phases of infection.”
From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [95]
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HIV Infection–Associated Tuberculosis: The Epidemiology and the Response
Getahun, H., Gunneberg, C., Granich, R., & Nunn, P. (2010) · Clinical Infectious Diseases · doi:10.1086/651492 · Cited by 598 · see citing works
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The mycobacterial cell envelope — a moving target
Dulberger, C. L., Rubin, E. J., & Boutte, C. C. (2020) · Nature Reviews Microbiology · doi:10.1038/s41579-019-0273-7 · Cited by 365 · see citing works
- Authors
- Refaya, A. K., Sharma, D., Kumar, V., Bisht, D., & Narayanan, S.
- Affiliations
- National Institute of Research in Tuberculosis (IN)
- National JALMA Institute for Leprosy & Other Mycobacterial Diseases (IN)
- Corresponding author
- Narayanan, Sujatha
- Venue
- Microbiological Research
- Publisher
- Elsevier BV
- Published
- 2016-09
- Volume
- 190
- Pages
- 1-11
- ISSN
- 0944-5013 (ISSN-L)
- OpenAlex
- W2346594768
- Cited by
- 13
- References
- 2
- Citations by year
- 2026: 1 · 2024: 2 · 2021: 3 · 2019: 2 · 2018: 4 · 2016: 1
- FWCI
- 2.16
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Microbiological Research (publishedVersion)
- PubMed (publishedVersion)
- NIRT Institutional Scholarship Repository (National Institute of Research in Tuberculosis) (acceptedVersion)
- Funders
- Indian Council of Medical Research
- Topics
- Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Health Sciences › Medicine › Epidemiology › Mycobacterium research and diagnosis
- Keywords
- serine/threonine kinase, Mycobacterium tuberculosis, adaptive response, phagosome, acid stress, lysozyme resistance, SDS resistance, bacterial growth kinetics, cell morphology, differentially expressed proteins, conditional gene knockdown, host-pathogen interaction
- MeSH terms
- Hydrogen-Ion Concentration, Microscopy, Electron, Scanning, Muramidase, Mycobacterium tuberculosis, Sodium Dodecyl Sulfate, Mass Spectrometry, Stress, Physiological, Electrophoresis, Gel, Two-Dimensional, Protein Serine-Threonine Kinases, Proteome, Gene Expression Profiling, RNA Interference, Microbial Viability, Gene Knockdown Techniques
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