
@article {137347,
	title = {Cysteine desulfurase (IscS)-mediated fine-tuning of bioenergetics and SUF expression prevents  hypervirulence.},
	journal = {Sci Adv},
	volume = {9},
	year = {2023},
	month = {2023 Dec 15},
	pages = {eadh2858},
	abstract = {<p>Iron-sulfur (Fe-S) biogenesis requires multiprotein assembly systems, SUF and ISC, in most prokaryotes. () encodes a complete SUF system, the depletion of which was bactericidal. The ISC operon is truncated to a single gene (cysteine desulfurase), whose function remains uncertain. Here, we show that Δ is bioenergetically deficient and hypersensitive to oxidative stress, antibiotics, and hypoxia. Δ resisted killing by nitric oxide (NO). RNA sequencing indicates that IscS is important for expressing regulons of DosR and Fe-S-containing transcription factors, WhiB3 and SufR. Unlike wild-type , Δ could not enter a stable persistent state, continued replicating in mice, and showed hypervirulence. The operon was overexpressed in Δ during infection in a NO-dependent manner. Suppressing expression in Δ either by CRISPR interference or upon infection in inducible NO-deficient mice arrests hypervirulence. Together, redesigned the ISC system to "fine-tune" the expression of SUF machinery for establishing persistence without causing detrimental disease in the host.</p>
},
	keywords = {Animals, Energy Metabolism, Escherichia coli, Iron-Sulfur Proteins, Mice, Mycobacterium tuberculosis},
	issn = {2375-2548},
	doi = {10.1126/sciadv.adh2858},
	author = {Das, Mayashree and Sreedharan, Sreesa and Shee, Somnath and Malhotra, Nitish and Nandy, Meghna and Banerjee, Ushashi and Kohli, Sakshi and Rajmani, Raju S and Chandra, Nagasuma and Seshasayee, Aswin Sai Narain and Laxman, Sunil and Singh, Amit}
}
@article {67836,
	title = {Targeting redox heterogeneity to counteract drug tolerance in replicating .},
	journal = {Sci Transl Med},
	volume = {11},
	year = {2019},
	month = {2019 Nov 13},
	abstract = {<p>The capacity of () to tolerate multiple antibiotics represents a major problem in tuberculosis (TB) management. Heterogeneity in populations is one of the factors that drives antibiotic tolerance during infection. However, the mechanisms underpinning this variation in bacterial population remain poorly understood. Here, we show that phagosomal acidification alters the redox physiology of to generate a population of replicating bacteria that display drug tolerance during infection. RNA sequencing of this redox-altered population revealed the involvement of iron-sulfur (Fe-S) cluster biogenesis, hydrogen sulfide (HS) gas, and drug efflux pumps in antibiotic tolerance. The fraction of the pH- and redox-dependent tolerant population increased when infected macrophages with actively replicating HIV-1, suggesting that redox heterogeneity could contribute to high rates of TB therapy failure during HIV-TB coinfection. Pharmacological inhibition of phagosomal acidification by the antimalarial drug chloroquine (CQ) eradicated drug-tolerant , ameliorated lung pathology, and reduced postchemotherapeutic relapse in in vivo models. The pharmacological profile of CQ ( and AUC) exhibited no major drug-drug interaction when coadministered with first line anti-TB drugs in mice. Our data establish a link between phagosomal pH, redox metabolism, and drug tolerance in replicating and suggest repositioning of CQ to shorten TB therapy and achieve a relapse-free cure.</p>
},
	issn = {1946-6242},
	doi = {10.1126/scitranslmed.aaw6635},
	author = {Mishra, Richa and Kohli, Sakshi and Malhotra, Nitish and Bandyopadhyay, Parijat and Mehta, Mansi and Munshi, MohamedHusen and Adiga, Vasista and Ahuja, Vijay Kamal and Shandil, Radha K and Rajmani, Raju S and Seshasayee, Aswin Sai Narain and Singh, Amit}
}
