Department of Biotechnology
inStem (Institute for Stem Cell Science and Regenerative Medicine)

Biosensor-integrated transposon mutagenesis reveals as a coordinator of redox homeostasis in .

Publication Type

Journal Article

Date of Publication

August 29, 2023

Journal

eLife

Volume/Issue

12

ISSN

2050-084X

() is evolutionarily equipped to resist exogenous reactive oxygen species (ROS) but shows vulnerability to an increase in endogenous ROS (eROS). Since eROS is an unavoidable consequence of aerobic metabolism, understanding how manages eROS levels is essential yet needs to be characterized. By combining the Mrx1-roGFP2 redox biosensor with transposon mutagenesis, we identified 368 genes (redoxosome) responsible for maintaining homeostatic levels of eROS in . Integrating redoxosome with a global network of transcriptional regulators revealed a hypothetical protein (Rv0158) as a critical node managing eROS in . Disruption of ( KO) impaired growth, redox balance, respiration, and metabolism of on glucose but not on fatty acids. Importantly, KO exhibited enhanced growth on propionate, and the Rv0158 protein directly binds to methylmalonyl-CoA, a key intermediate in propionate catabolism. Metabolite profiling, ChIP-Seq, and gene-expression analyses indicate that Rv0158 manages metabolic neutralization of propionate toxicity by regulating the methylcitrate cycle. Disruption of enhanced the sensitivity of to oxidative stress, nitric oxide, and anti-TB drugs. Lastly, KO showed poor survival in macrophages and persistence defect in mice. Our results suggest that Rv0158 is a metabolic integrator for carbon metabolism and redox balance in .

Alternate Journal

Elife

PubMed ID

37642294

PubMed Central ID

PMC10501769

Authors

Somnath Shee
Reshma T Veetil
Karthikeyan Mohanraj
Mayashree Das
Nitish Malhotra
Devleena Bandopadhyay
Hussain Beig
Shalini Birua
Shreyas Niphadkar
Sathya Narayanan Nagarajan
Vikrant Kumar Sinha
Chandrani Thakur
Raju S Rajmani
Nagasuma Chandra
Sunil Laxman
Mahavir Singh
Areejit Samal
Aswin N Seshasayee
Amit Singh

Keywords

Reactive Oxygen Species
Homeostasis
Oxidation-Reduction
Coleoptera
Mutagenesis
Animals
Mice
Mycobacterium tuberculosis
Propionates