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Anjou C, Lotoux A, Morvan C, Martin-Verstraete I. From ubiquity to specificity: The diverse functions of bacterial thioredoxin systems. Environ Microbiol 2024; 26:e16668. [PMID: 38899743 DOI: 10.1111/1462-2920.16668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Accepted: 05/24/2024] [Indexed: 06/21/2024]
Abstract
The thioredoxin (Trx) system, found universally, is responsible for the regeneration of reversibly oxidized protein thiols in living cells. This system is made up of a Trx and a Trx reductase, and it plays a central role in maintaining thiol-based redox homeostasis by reducing oxidized protein thiols, such as disulfide bonds in proteins. Some Trxs also possess a chaperone function that is independent of thiol-disulfide exchange, in addition to their thiol-disulfide reductase activity. These two activities of the Trx system are involved in numerous physiological processes in bacteria. This review describes the diverse physiological roles of the Trx system that have emerged throughout bacterial evolution. The Trx system is essential for responding to oxidative and nitrosative stress. Beyond this primary function, the Trx system also participates in redox regulation and signal transduction, and in controlling metabolism, motility, biofilm formation, and virulence. This range of functions has evolved alongside the diversity of bacterial lifestyles and their specific constraints. This evolution can be characterized by the multiplication of the systems and by the specialization of cofactors or targets to adapt to the constraints of atypical lifestyles, such as photosynthesis, insect endosymbiosis, or spore-forming bacteria.
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Affiliation(s)
- Cyril Anjou
- Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Laboratoire Pathogenèse des Bactéries Anaérobies, Paris, France
| | - Aurélie Lotoux
- Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Laboratoire Pathogenèse des Bactéries Anaérobies, Paris, France
| | - Claire Morvan
- Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Laboratoire Pathogenèse des Bactéries Anaérobies, Paris, France
| | - Isabelle Martin-Verstraete
- Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Laboratoire Pathogenèse des Bactéries Anaérobies, Paris, France
- Institut Universitaire de France, Paris, France
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2
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Dagah OMA, Silaa BB, Zhu M, Pan Q, Qi L, Liu X, Liu Y, Peng W, Ullah Z, Yudas AF, Muhammad A, Zhang X, Lu J. Exploring Immune Redox Modulation in Bacterial Infections: Insights into Thioredoxin-Mediated Interactions and Implications for Understanding Host-Pathogen Dynamics. Antioxidants (Basel) 2024; 13:545. [PMID: 38790650 PMCID: PMC11117976 DOI: 10.3390/antiox13050545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/26/2024] [Accepted: 04/26/2024] [Indexed: 05/26/2024] Open
Abstract
Bacterial infections trigger a multifaceted interplay between inflammatory mediators and redox regulation. Recently, accumulating evidence has shown that redox signaling plays a significant role in immune initiation and subsequent immune cell functions. This review addresses the crucial role of the thioredoxin (Trx) system in the initiation of immune reactions and regulation of inflammatory responses during bacterial infections. Downstream signaling pathways in various immune cells involve thiol-dependent redox regulation, highlighting the pivotal roles of thiol redox systems in defense mechanisms. Conversely, the survival and virulence of pathogenic bacteria are enhanced by their ability to counteract oxidative stress and immune attacks. This is achieved through the reduction of oxidized proteins and the modulation of redox-sensitive signaling pathways, which are functions of the Trx system, thereby fortifying bacterial resistance. Moreover, some selenium/sulfur-containing compounds could potentially be developed into targeted therapeutic interventions for pathogenic bacteria. Taken together, the Trx system is a key player in redox regulation during bacterial infection, and contributes to host-pathogen interactions, offering valuable insights for future research and therapeutic development.
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Affiliation(s)
- Omer M. A. Dagah
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Billton Bryson Silaa
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Minghui Zhu
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Qiu Pan
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Linlin Qi
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Xinyu Liu
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Yuqi Liu
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Wenjing Peng
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Zakir Ullah
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Appolonia F. Yudas
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | - Amir Muhammad
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
| | | | - Jun Lu
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (O.M.A.D.); (B.B.S.); (M.Z.); (Q.P.); (L.Q.); (X.L.); (Y.L.); (W.P.); (Z.U.); (A.F.Y.); (A.M.)
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3
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Werman J, Chen YC, Yuan T, Yang X, Sampson NS. A Chemoproteomic Approach to Elucidate the Mechanism of Action of 6-Azasteroids with Unique Activity in Mycobacteria. ACS Infect Dis 2023; 9:1993-2004. [PMID: 37774412 PMCID: PMC10580313 DOI: 10.1021/acsinfecdis.3c00296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Indexed: 10/01/2023]
Abstract
By illuminating key 6-azasteroid-protein interactions in both Mycobacterium tuberculosis (Mtb) and the closely related model organism Mycobacterium marinum (Mm), we sought to improve the antimycobacterial potency of 6-azasteroids and further our understanding of the mechanisms responsible for their potentiation of the antituberculosis drug bedaquiline. We selected a newly developed 6-azasteroid analog and an analog reported previously (ACS Infect. Dis. 2019, 5 (7), 1239-1251) to study their phenotypic effects on Mtb and Mm, both alone and in combination with bedaquiline. The 6-azasteroid analog, 17β-[N-(4-trifluoromethoxy-diphenylmethyl)carbamoyl]-6-propyl-azaandrostan-3-one, robustly potentiated bedaquiline-mediated antimycobacterial activity, with a nearly 8-fold reduction in Mm bedaquiline minimal inhibitory concentration (85 nM alone versus 11 nM with 20 μM 6-azasteroid). This analog displayed minimal inhibitory activity against recombinant mycobacterial 3β-hydroxysteroid dehydrogenase, a previously identified target of several 6-azasteroids. Dose-dependent potentiation of bedaquiline by this analog reduced mycobacterial intracellular ATP levels and impeded the ability of Mtb to neutralize exogenous oxidative stress in culture. We developed two 6-azasteroid photoaffinity probes to investigate azasteroid-protein interactions in Mm whole cells. Using bottom-up mass spectrometric profiling of the cross-linked proteins, we identified eight potential Mm/Mtb protein targets for 6-azasteroids. The nature of these potential targets indicates that proteins related to oxidative stress resistance play a key role in the BDQ-potentiating activity of azasteroids and highlights the potential impact of inhibition of these targets on the generation of drug sensitivity.
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Affiliation(s)
- Joshua
M. Werman
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Yu-Ching Chen
- Program
in Biochemistry and Structural Biology, Stony Brook University, Stony
Brook, New York 11794-5215, United States
| | - Tianao Yuan
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Xinxin Yang
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Nicole S. Sampson
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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4
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Sugandhi S, Rajmane V, Taunk K, Jadhav S, Nema V, Rapole S, Mande SC. The role of thioredoxin proteins in Mycobacterium tuberculosis probed by proteome-wide target profiling. Biochem Biophys Rep 2023; 35:101512. [PMID: 37521372 PMCID: PMC10371808 DOI: 10.1016/j.bbrep.2023.101512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/27/2023] [Accepted: 07/06/2023] [Indexed: 08/01/2023] Open
Abstract
Mycobacterium tuberculosis encounters diverse microenvironments, including oxidative assault (ROS and RNS), when it attempts to establish itself within its human host. Therefore, redox sensory and regulation processes are assumed significant importance, as these are essential processes for M. tuberculosis to survive under these hostile conditions. M. tuberculosis contains thioredoxin system to maintain redox homeostasis, which establish a balance between the thiol/dithiol couple. Still very less is known about it. In the present study, we attempted to capture the targets of all the M. tuberculosis thioredoxin proteins (viz., TrxB and TrxC) and a thioredoxin-like protein, NrdH, under aerobic and hypoxic conditions by performing thioredoxin trapping chromatography followed by mass spectrometry. We found that TrxC captured the maximum number of targets in both the physiological conditions and most of the targets of TrxB and NrdH showing overlap with targets of TrxC, indicating that TrxC acts as main thioredoxin. Further the PANTHER classification system provides involvement of targets in various metabolic processes and Gene Ontology analysis suggests that glutamine biosynthetic process and Fe-S cluster biosynthesis are the most enriched processes in the target list of TrxC and TrxB respectively. Also, we suggest that the thioredoxin system might play an important role under hypoxia by targeting those proteins which are responsible to sense and maintain hypoxic conditions. Furthermore, our studies establish a link between TrxB and iron-sulfur cluster biogenesis in M. tuberculosis. Ultimately, these findings open a new direction to target the thioredoxin system for screening new anti-mycobacterial drug targets.
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Affiliation(s)
- Sapna Sugandhi
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Pune, India
| | - Vyankatesh Rajmane
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Pune, India
| | - Khushman Taunk
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Pune, India
| | - Sushama Jadhav
- Division of Molecular Biology, ICMR-National AIDS Research Institute, Pune, India
| | - Vijay Nema
- Division of Molecular Biology, ICMR-National AIDS Research Institute, Pune, India
| | - Srikanth Rapole
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Pune, India
| | - Shekhar C. Mande
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Pune, India
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5
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Füsser FT, Wollenhaupt J, Weiss MS, Kümmel D, Koch O. Novel starting points for fragment-based drug design against mycobacterial thioredoxin reductase identified using crystallographic fragment screening. Acta Crystallogr D Struct Biol 2023; 79:857-865. [PMID: 37574972 PMCID: PMC10478635 DOI: 10.1107/s2059798323005223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 06/12/2023] [Indexed: 08/15/2023] Open
Abstract
The increasing number of people dying from tuberculosis and the existence of extensively drug-resistant strains has led to an urgent need for new antituberculotic drugs with alternative modes of action. As part of the thioredoxin system, thioredoxin reductase (TrxR) is essential for the survival of Mycobacterium tuberculosis (Mtb) and shows substantial differences from human TrxR, making it a promising and most likely selective target. As a model organism for Mtb, crystals of Mycobacterium smegmatis TrxR that diffracted to high resolution were used in crystallographic fragment screening to discover binding fragments and new binding sites. The application of the 96 structurally diverse fragments from the F2X-Entry Screen revealed 56 new starting points for fragment-based drug design of new TrxR inhibitors. Over 200 crystal structures were analyzed using FragMAXapp, which includes processing and refinement by largely automated software pipelines and hit identification via the multi-data-set analysis approach PanDDA. The fragments are bound to 11 binding sites, of which four are positioned at binding pockets or important interaction sites and therefore show high potential for possible inhibition of TrxR.
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Affiliation(s)
- Friederike T. Füsser
- Institute of Pharmaceutical and Medicinal Chemistry, Münster University, Corrensstrasse 48, 48149 Münster, Germany
- German Center of Infection Research, Münster University, Corrensstrasse 48, 48149 Münster, Germany
- Institute of Biochemistry, Münster University, Corrensstrasse 36, 48149 Münster, Germany
| | - Jan Wollenhaupt
- Macromolecular Crystallography Group, Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Manfred S. Weiss
- Macromolecular Crystallography Group, Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Daniel Kümmel
- Institute of Biochemistry, Münster University, Corrensstrasse 36, 48149 Münster, Germany
| | - Oliver Koch
- Institute of Pharmaceutical and Medicinal Chemistry, Münster University, Corrensstrasse 48, 48149 Münster, Germany
- German Center of Infection Research, Münster University, Corrensstrasse 48, 48149 Münster, Germany
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6
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Jaiswal S, Kumar S, Velarde de la Cruz E. Exploring the role of the protein tyrosine kinase a (PtkA) in mycobacterial intracellular survival. Tuberculosis (Edinb) 2023; 142:102398. [PMID: 37657276 DOI: 10.1016/j.tube.2023.102398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 08/15/2023] [Accepted: 08/23/2023] [Indexed: 09/03/2023]
Abstract
Mycobacterium tuberculosis (Mtb) continues to define new paradigms of host-pathogen interaction. There are several host proteins known which are regulated by Mtb infection. The proteins which regulate host biological processes like apoptosis, cell processes, stress proteins, metabolic enzymes, etc. are targeted by the pathogens. Mtb proteins interact directly or indirectly with host proteins and play an important role in their persistence and intracellular growth. Mtb is an intracellular pathogen. It remains dormant for years within the host without activating its immune system. Mtb Protein tyrosine kinase (PtkA) regulates host anti-apoptotic protein, metabolic enzymes, and several other proteins that are involved in stress regulation, cell proliferation, protein folding, DNA repair, etc. PtkA regulates other mycobacterial proteins and plays an important role in its growth and survival. Here we summarized the current knowledge of PtkA and reviewed its role in mycobacterial intracellular survival as it regulates several other mycobacterial proteins and host proteins. PtkA regulates PtpA secretion which is essential for mycobacterial virulence and could be used as an attractive drug target.
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Affiliation(s)
- Swati Jaiswal
- University of Massachusetts Chan Medical School, Worcester, United States.
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7
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Wettstadt S. Working together to fighting the bad guys. MICROLIFE 2023; 4:uqad022. [PMID: 37223724 PMCID: PMC10167628 DOI: 10.1093/femsml/uqad022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 03/24/2023] [Accepted: 04/14/2023] [Indexed: 05/25/2023]
Affiliation(s)
- Sarah Wettstadt
- Corresponding author. Kopenhagener Str. 22, 13407 Berlin. E-mail:
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8
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Mishra S, Saito K. Clinically encountered growth phenotypes of tuberculosis-causing bacilli and their in vitro study: A review. Front Cell Infect Microbiol 2022; 12:1029111. [PMID: 36439231 PMCID: PMC9684195 DOI: 10.3389/fcimb.2022.1029111] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 10/20/2022] [Indexed: 07/11/2024] Open
Abstract
The clinical manifestations of tuberculosis (TB) vary widely in severity, site of infection, and outcomes of treatment-leading to simultaneous efforts to individualize therapy safely and to search for shorter regimens that can be successfully used across the clinical spectrum. In these endeavors, clinicians and researchers alike employ mycobacterial culture in rich media. However, even within the same patient, individual bacilli among the population can exhibit substantial variability in their culturability. Bacilli in vitro also demonstrate substantial heterogeneity in replication rate and cultivation requirements, as well as susceptibility to killing by antimicrobials. Understanding parallels in clinical, ex vivo and in vitro growth phenotype diversity may be key to identifying those phenotypes responsible for treatment failure, relapse, and the reactivation of bacilli that progresses TB infection to disease. This review briefly summarizes the current role of mycobacterial culture in the care of patients with TB and the ex vivo evidence of variability in TB culturability. We then discuss current advances in in vitro models that study heterogenous subpopulations within a genetically identical bulk culture, with an emphasis on the effect of oxidative stress on bacillary cultivation requirements. The review highlights the complexity that heterogeneity in mycobacterial growth brings to the interpretation of culture in clinical settings and research. It also underscores the intricacies present in the interplay between growth phenotypes and antimicrobial susceptibility. Better understanding of population dynamics and growth requirements over time and space promises to aid both the attempts to individualize TB treatment and to find uniformly effective therapies.
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Affiliation(s)
- Saurabh Mishra
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, United States
| | - Kohta Saito
- Department of Medicine, Weill Cornell Medicine, New York, NY, United States
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Choudhary E, Sharma R, Pal P, Agarwal N. Deciphering the Proteomic Landscape of Mycobacterium tuberculosis in Response to Acid and Oxidative Stresses. ACS OMEGA 2022; 7:26749-26766. [PMID: 35936415 PMCID: PMC9352160 DOI: 10.1021/acsomega.2c03092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
The fundamental to the pathogenicity of Mycobacterium tuberculosis (Mtb) is the modulation in the control mechanisms that play a role in sensing and counteracting the microbicidal milieu encompassing various cellular stresses inside the human host. To understand such changes, we measured the cellular proteome of Mtb subjected to different stresses using a quantitative proteomics approach. We identified defined sets of Mtb proteins that are modulated in response to acid and a sublethal dose of diamide and H2O2 treatments. Notably, proteins involved in metabolic, catalytic, and binding functions are primarily affected under these stresses. Moreover, our analysis led to the observations that during acidic stress Mtb enters into energy-saving mode simultaneously modulating the acid tolerance system, whereas under diamide and H2O2 stresses, there were prominent changes in the biosynthesis and homeostasis pathways, primarily modifying the resistance mechanism in diamide-treated bacteria while causing metabolic arrest in H2O2-treated bacilli. Overall, we delineated the adaptive mechanisms that Mtb may utilize under physiological stresses and possible overlap between the responses to these stress conditions. In addition to offering important protein signatures that can be exploited for future mechanistic studies, our study highlights the importance of proteomics in understanding complex adjustments made by the human pathogen during infection.
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Affiliation(s)
- Eira Choudhary
- Laboratory
of Mycobacterial Genetics, Translational
Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad121001, Haryana, India
- Symbiosis
School of Biomedical Sciences, Symbiosis
International (Deemed University), Pune412115, Maharashtra, India
| | - Rishabh Sharma
- Laboratory
of Mycobacterial Genetics, Translational
Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad121001, Haryana, India
| | - Pramila Pal
- Laboratory
of Mycobacterial Genetics, Translational
Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad121001, Haryana, India
- Jawaharlal
Nehru University, New
Mehrauli Road, New Delhi110067, India
| | - Nisheeth Agarwal
- Laboratory
of Mycobacterial Genetics, Translational
Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad121001, Haryana, India
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10
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Molecular Connectivity between Extracytoplasmic Sigma Factors and PhoP Accounts for Coupled Mycobacterial Stress Response. J Bacteriol 2022; 204:e0011022. [PMID: 35608366 DOI: 10.1128/jb.00110-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mycobacterium tuberculosis encounters numerous stress conditions within the host, but how it is able to mount a coupled stress response remains unknown. Growing evidence suggests that under acidic pH, M. tuberculosis modulates redox homeostasis. In an attempt to dissect the mechanistic details of responses to multiple stress conditions, here we studied the significance of connectivity of extracytoplasmic sigma factors with PhoP. We show that PhoP impacts the mycothiol redox state, and the H37Rv ΔphoP deletion mutant strain displays a significantly higher susceptibility to redox stress than the wild-type bacilli. To probe how the two regulators PhoP and redox-active sigma factor SigH contribute to redox homeostasis, we show that SigH controls expression of redox-active thioredoxin genes, a major mycobacterial antioxidant system, and under redox stress, SigH, but not PhoP, is recruited at the target promoters. Consistent with these results, interaction between PhoP and SigH fails to impact redox-dependent gene expression. This is in striking contrast to our previous results showing PhoP-dependent SigE recruitment within acid-inducible mycobacterial promoters to maintain pH homeostasis. Our subsequent results demonstrate reduced PhoP-SigH interaction in the presence of diamide and enhanced PhoP-SigE interaction under low pH. These contrasting results uncover the underlying mechanism of the mycobacterial adaptive program, coupling low pH with maintenance of redox homeostasis. IMPORTANCE M. tuberculosis encounters reductive stress under acidic pH. To investigate the mechanism of coupled stress response, we show that PhoP plays a major role in mycobacterial redox stress response. We observed a strong correlation of phoP-dependent redox-active expression of thioredoxin genes, a major mycobacterial antioxidant system. Further probing of functioning of regulators revealed that while PhoP controls pH homeostasis via its interaction with SigE, direct recruitment of SigH, but not PhoP-SigH interaction, controls expression of thioredoxin genes. These strikingly contrasting results showing enhanced PhoP-SigE interaction under acidic pH and reduced PhoP-SigH interaction under redox conditions uncover the underlying novel mechanism of the mycobacterial adaptive program, coupling low pH with maintenance of redox homeostasis.
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11
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Chung ES, Johnson WC, Aldridge BB. Types and functions of heterogeneity in mycobacteria. Nat Rev Microbiol 2022; 20:529-541. [PMID: 35365812 DOI: 10.1038/s41579-022-00721-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2022] [Indexed: 12/24/2022]
Abstract
The remarkable ability of Mycobacterium tuberculosis to survive attacks from the host immune response and drug treatment is due to the resilience of a few bacilli rather than a result of survival of the entire population. Maintenance of mycobacterial subpopulations with distinct phenotypic characteristics is key for survival in the face of dynamic and variable stressors encountered during infection. Mycobacterial populations develop a wide range of phenotypes through an innate asymmetric growth pattern and adaptation to fluctuating microenvironments during infection that point to heterogeneity being a vital survival strategy. In this Review, we describe different types of mycobacterial heterogeneity and discuss how heterogeneity is generated and regulated in response to environmental cues. We discuss how this heterogeneity may have a key role in recording memory of their environment at both the single-cell level and the population level to give mycobacterial populations plasticity to withstand complex stressors.
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Affiliation(s)
- Eun Seon Chung
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA
| | - William C Johnson
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA.,Tufts University School of Graduate Biomedical Sciences, Boston, MA, USA
| | - Bree B Aldridge
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, USA. .,Tufts University School of Graduate Biomedical Sciences, Boston, MA, USA. .,Stuart B. Levy Center for Integrated Management of Antimicrobial Resistance, Tufts University, Boston, MA, USA. .,Department of Biomedical Engineering, Tufts University School of Engineering, Medford, MA, USA.
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12
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Willemse D, Moodley C, Mehra S, Kaushal D. Transcriptional Response of Mycobacterium tuberculosis to Cigarette Smoke Condensate. Front Microbiol 2021; 12:744800. [PMID: 34721344 PMCID: PMC8554204 DOI: 10.3389/fmicb.2021.744800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 09/13/2021] [Indexed: 11/13/2022] Open
Abstract
Smoking is known to be an added risk factor for tuberculosis (TB), with nearly a quarter of the TB cases attributed to cigarette smokers in the 22 countries with the highest TB burden. Many studies have indicated a link between risk of active TB and cigarette smoke. Smoking is also known to significantly decrease TB cure and treatment completion rate and increase mortality rates. Cigarette smoke contains thousands of volatile compounds including carcinogens, toxins, reactive solids, and oxidants in both particulate and gaseous phase. Yet, to date, limited studies have analyzed the impact of cigarette smoke components on Mycobacterium tuberculosis (Mtb), the causative agent of TB. Here we report the impact of cigarette smoke condensate (CSC) on survival, mutation frequency, and gene expression of Mtb in vitro. We show that exposure of virulent Mtb to cigarette smoke increases the mutation frequency of the pathogen and strongly induces the expression of the regulon controlled by SigH—a global transcriptional regulator of oxidative stress. SigH has previously been shown to be required for Mtb to respond to oxidative stress, survival, and granuloma formation in vivo. A high-SigH expression phenotype is known to be associated with greater virulence of Mtb. In patients with pulmonary TB who smoke, these changes may therefore play an important, yet unexplored, role in the treatment efficacy by potentially enhancing the virulence of tubercle bacilli.
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Affiliation(s)
- Danicke Willemse
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX, United States
| | - Chivonne Moodley
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX, United States.,Tulane National Primate Research Center, Tulane University Health Sciences Center, Covington, LA, United States
| | - Smriti Mehra
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX, United States.,Tulane National Primate Research Center, Tulane University Health Sciences Center, Covington, LA, United States
| | - Deepak Kaushal
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX, United States
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13
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Kalra R, Tiwari D, Dkhar HK, Bhagyaraj E, Kumar R, Bhardwaj A, Gupta P. Host factors subverted by Mycobacterium tuberculosis: Potential targets for host directed therapy. Int Rev Immunol 2021; 42:43-70. [PMID: 34678117 DOI: 10.1080/08830185.2021.1990277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
INTRODUCTION Despite new approaches in the diagnosis and treatment of tuberculosis (TB), it continues to be a major health burden. Several immunotherapies that potentiate the immune response have come up as adjuncts to drug therapies against drug resistant TB strains; however, there needs to be an urgent appraisal of host specific drug targets for improving their clinical management and to curtail disease progression. Presently, various host directed therapies (HDTs) exist (repurposed drugs, nutraceuticals, monoclonal antibodies and immunomodulatory agents), but these mostly address molecules that combat disease progression. AREAS COVERED The current review discusses major Mycobacterium tuberculosis (M. tuberculosis) survival paradigms inside the host and presents a plethora of host targets subverted by M. tuberculosis which can be further explored for future HDTs. The host factors unique to M. tuberculosis infection (in humans) have also been identified through an in-silico interaction mapping. EXPERT OPINION HDTs could become the next-generation adjunct therapies in order to counter antimicrobial resistance and virulence, as well as to reduce the duration of existing TB treatments. However, current scientific efforts are largely directed toward combatants rather than host molecules co-opted by M. tuberculosis for its survival. This might drive the immune system to a hyper-inflammatory condition; therefore, we emphasize that host factors subverted by M. tuberculosis, and their subsequent neutralization, must be considered for development of better HDTs.
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Affiliation(s)
- Rashi Kalra
- Department of Molecular Biology, CSIR-Institute of Microbial Technology, Chandigarh-160036, India
| | - Drishti Tiwari
- Department of Molecular Biology, CSIR-Institute of Microbial Technology, Chandigarh-160036, India
| | - Hedwin Kitdorlang Dkhar
- Department of Molecular Biology, CSIR-Institute of Microbial Technology, Chandigarh-160036, India
| | - Ella Bhagyaraj
- Department of Molecular Biology, CSIR-Institute of Microbial Technology, Chandigarh-160036, India
| | - Rakesh Kumar
- Bioinformatics Center, CSIR-Institute of Microbial Technology, Chandigarh-160036, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Anshu Bhardwaj
- Bioinformatics Center, CSIR-Institute of Microbial Technology, Chandigarh-160036, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Pawan Gupta
- Department of Molecular Biology, CSIR-Institute of Microbial Technology, Chandigarh-160036, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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14
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Dutta E, DeJesus MA, Ruecker N, Zaveri A, Koh EI, Sassetti CM, Schnappinger D, Ioerger TR. An improved statistical method to identify chemical-genetic interactions by exploiting concentration-dependence. PLoS One 2021; 16:e0257911. [PMID: 34597304 PMCID: PMC8486102 DOI: 10.1371/journal.pone.0257911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 09/13/2021] [Indexed: 11/18/2022] Open
Abstract
Chemical-genetics (C-G) experiments can be used to identify interactions between inhibitory compounds and bacterial genes, potentially revealing the targets of drugs, or other functionally interacting genes and pathways. C-G experiments involve constructing a library of hypomorphic strains with essential genes that can be knocked-down, treating it with an inhibitory compound, and using high-throughput sequencing to quantify changes in relative abundance of individual mutants. The hypothesis is that, if the target of a drug or other genes in the same pathway are present in the library, such genes will display an excessive fitness defect due to the synergy between the dual stresses of protein depletion and antibiotic exposure. While assays at a single drug concentration are susceptible to noise and can yield false-positive interactions, improved detection can be achieved by requiring that the synergy between gene and drug be concentration-dependent. We present a novel statistical method based on Linear Mixed Models, called CGA-LMM, for analyzing C-G data. The approach is designed to capture the dependence of the abundance of each gene in the hypomorph library on increasing concentrations of drug through slope coefficients. To determine which genes represent candidate interactions, CGA-LMM uses a conservative population-based approach in which genes with negative slopes are considered significant only if they are outliers with respect to the rest of the population (assuming that most genes in the library do not interact with a given inhibitor). We applied the method to analyze 3 independent hypomorph libraries of M. tuberculosis for interactions with antibiotics with anti-tubercular activity, and we identify known target genes or expected interactions for 7 out of 9 drugs where relevant interacting genes are known.
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Affiliation(s)
- Esha Dutta
- Department of Computer Science, Texas A&M University, College Station, TX, United States of America
| | - Michael A. DeJesus
- Laboratory of Host-Pathogen Biology, The Rockefeller University, New York, NY, United States of America
| | - Nadine Ruecker
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY, United States of America
| | - Anisha Zaveri
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY, United States of America
| | - Eun-Ik Koh
- Department of Microbiology & Physiological Systems, University of Massachusetts Medical School, Worchester, MA, United States of America
| | - Christopher M. Sassetti
- Department of Microbiology & Physiological Systems, University of Massachusetts Medical School, Worchester, MA, United States of America
| | - Dirk Schnappinger
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY, United States of America
| | - Thomas R. Ioerger
- Department of Computer Science, Texas A&M University, College Station, TX, United States of America
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15
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Su H, Lin K, Tiwari D, Healy C, Trujillo C, Liu Y, Ioerger TR, Schnappinger D, Ehrt S. Genetic models of latent tuberculosis in mice reveal differential influence of adaptive immunity. J Exp Med 2021; 218:e20210332. [PMID: 34269789 PMCID: PMC8289691 DOI: 10.1084/jem.20210332] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/27/2021] [Accepted: 06/29/2021] [Indexed: 01/29/2023] Open
Abstract
Studying latent Mycobacterium tuberculosis (Mtb) infection has been limited by the lack of a suitable mouse model. We discovered that transient depletion of biotin protein ligase (BPL) and thioredoxin reductase (TrxB2) results in latent infections during which Mtb cannot be detected but that relapse in a subset of mice. The immune requirements for Mtb control during latency, and the frequency of relapse, were strikingly different depending on how latency was established. TrxB2 depletion resulted in a latent infection that required adaptive immunity for control and reactivated with high frequency, whereas latent infection after BPL depletion was independent of adaptive immunity and rarely reactivated. We identified immune signatures of T cells indicative of relapse and demonstrated that BCG vaccination failed to protect mice from TB relapse. These reproducible genetic latency models allow investigation of the host immunological determinants that control the latent state and offer opportunities to evaluate therapeutic strategies in settings that mimic aspects of latency and TB relapse in humans.
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Affiliation(s)
- Hongwei Su
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Kan Lin
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Divya Tiwari
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Claire Healy
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Carolina Trujillo
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Yao Liu
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Thomas R. Ioerger
- Department of Computer Science and Engineering, Texas A&M University, College Station, TX
| | - Dirk Schnappinger
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
| | - Sabine Ehrt
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY
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16
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Lata S, Akif M. Structure-based identification of natural compound inhibitor against M. tuberculosis thioredoxin reductase: insight from molecular docking and dynamics simulation. J Biomol Struct Dyn 2021; 39:4480-4489. [PMID: 32567497 DOI: 10.1080/07391102.2020.1778530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 05/30/2020] [Indexed: 12/19/2022]
Abstract
Antioxidant systems of M. tuberculosis (Mtb) play an important role in providing resistance in the hostile environment of mononuclear phagocytes. Thioredoxin system is a known antioxidant system that consists of three copies of thioredoxins (Trxs) and a single copy of thioredoxin reductase (TrxR). TrxR has been validated as an essential gene known to be involved in the reduction of peroxides, dinitrobenzenes and hydroperoxides, and is crucial in maintaining the survival of Mtb in macrophages. Recently, it has been demonstrated to be a druggable target. In this study, molecular docking was applied to screen more than 20,000 natural compounds from the Traditional Chinese Medicine database. Theoretical calculation of ΔGbinding by the Molecular Mechanics Poisson-Boltzmann Surface Area (MM-PBSA) methods indicated two top-hit compounds that bind with a high affinity to the allosteric site, consisting of a hinge region, of TrxR. Further, stability and binding analysis of both compounds were carried out with molecular dynamics simulation. An analysis of conformational variation by principal component analysis (PCA) and protein contact network (PCN) uncovered the conformational changes in the compound-bound forms of protein. The NADPH domain formed many new interactions with the FAD domain in the compound-bound form, signifying that the binding may render an effect on the protein structure and function. Our results suggest that these two compounds could potentially be used for structure-based lead inhibitors against TrxR. The inhibitor selected as lead compound will be used further as a scaffold to optimize as novel anti-tuberculosis therapeutic.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Surabhi Lata
- Laboratory of Structural Biology, Department of Biochemistry, School of Life Sciences, University of Hyderabad, Gachibowli, Hyderabad, Telangana, India
| | - Mohd Akif
- Laboratory of Structural Biology, Department of Biochemistry, School of Life Sciences, University of Hyderabad, Gachibowli, Hyderabad, Telangana, India
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17
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Dechow SJ, Coulson GB, Wilson MW, Larsen SD, Abramovitch RB. AC2P20 selectively kills Mycobacterium tuberculosis at acidic pH by depleting free thiols. RSC Adv 2021; 11:20089-20100. [PMID: 34168865 PMCID: PMC8176622 DOI: 10.1039/d1ra03181c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) senses and adapts to host immune cues as part of its pathogenesis. One environmental cue sensed by Mtb is the acidic pH of its host niche in the macrophage phagosome. Disrupting the ability of Mtb to sense and adapt to acidic pH has the potential to reduce survival of Mtb in macrophages. Previously, a high throughput screen of a ∼220 000 compound small molecule library was conducted to discover chemical probes that inhibit Mtb growth at acidic pH. The screen discovered chemical probes that kill Mtb at pH 5.7 but are inactive at pH 7.0. In this study, AC2P20 was prioritized for continued study to test the hypothesis that it was targeting Mtb pathways associated with pH-driven adaptation. RNAseq transcriptional profiling studies showed AC2P20 modulates expression of genes associated with redox homeostasis. Gene enrichment analysis revealed that the AC2P20 transcriptional profile had significant overlap with a previously characterized pH-selective inhibitor, AC2P36. Like AC2P36, we show that AC2P20 kills Mtb by selectively depleting free thiols at acidic pH. Mass spectrometry studies show the formation of a disulfide bond between AC2P20 and reduced glutathione, supporting a mechanism where AC2P20 is able to deplete intracellular thiols and dysregulate redox homeostasis. The observation of two independent molecules targeting free thiols to kill Mtb at acidic pH further supports that Mtb has restricted redox homeostasis and sensitivity to thiol-oxidative stress at acidic pH.
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Affiliation(s)
- Shelby J Dechow
- Department of Microbiology and Molecular Genetics, Michigan State University East Lansing MI 48824 USA +1 517 353-8957 +1 517 884-5416
| | - Garry B Coulson
- Department of Microbiology and Molecular Genetics, Michigan State University East Lansing MI 48824 USA +1 517 353-8957 +1 517 884-5416
| | - Michael W Wilson
- Vahlteich Medicinal Chemistry Core, College of Pharmacy, University of Michigan Ann Arbor MI 48109 USA
| | - Scott D Larsen
- Vahlteich Medicinal Chemistry Core, College of Pharmacy, University of Michigan Ann Arbor MI 48109 USA
| | - Robert B Abramovitch
- Department of Microbiology and Molecular Genetics, Michigan State University East Lansing MI 48824 USA +1 517 353-8957 +1 517 884-5416
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18
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Kim JS, Cho E, Mun SJ, Kim S, Kim SY, Kim DG, Son W, Jeon HI, Kim HK, Jeong YJ, Jang S, Kim HS, Yang CS. Multi-Functional MPT Protein as a Therapeutic Agent against Mycobacterium tuberculosis. Biomedicines 2021; 9:biomedicines9050545. [PMID: 34068051 PMCID: PMC8152475 DOI: 10.3390/biomedicines9050545] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/03/2021] [Accepted: 05/12/2021] [Indexed: 02/07/2023] Open
Abstract
Mycobacterium tuberculosis (MTB), the causative agent of tuberculosis (TB), avoids the host immune system through its virulence factors. MPT63 and MPT64 are the virulence factors secreted by MTB which regulate host proteins for the survival and proliferation of MTB in the host. Here, we found that MPT63 bound directly with TBK1 and p47phox, whereas MPT64 interacted with TBK1 and HK2. We constructed a MPT63/64-derived multifunctional recombinant protein (rMPT) that was able to interact with TBK1, p47phox, or HK2. rMPT was shown to regulate IFN-β levels and increase inflammation and concentration of reactive oxygen species (ROS), while targeting macrophages and killing MTB, both in vitro and in vivo. Furthermore, the identification of the role of rMPT against MTB was achieved via vaccination in a mouse model. Taken together, we here present rMPT, which, by regulating important immune signaling systems, can be considered an effective vaccine or therapeutic agent against MTB.
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Affiliation(s)
- Jae-Sung Kim
- Department of Bionano Technology, Hanyang University, Seoul 04673, Korea; (J.-S.K.); (E.C.); (S.-J.M.); (S.-Y.K.)
- Institute of Natural Science & Technology, Hanyang University, Ansan 15588, Korea
| | - Euni Cho
- Department of Bionano Technology, Hanyang University, Seoul 04673, Korea; (J.-S.K.); (E.C.); (S.-J.M.); (S.-Y.K.)
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
| | - Seok-Jun Mun
- Department of Bionano Technology, Hanyang University, Seoul 04673, Korea; (J.-S.K.); (E.C.); (S.-J.M.); (S.-Y.K.)
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
| | - Sojin Kim
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Sun-Young Kim
- Department of Bionano Technology, Hanyang University, Seoul 04673, Korea; (J.-S.K.); (E.C.); (S.-J.M.); (S.-Y.K.)
| | - Dong-Gyu Kim
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Wooic Son
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Hye-In Jeon
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Hyo-Keun Kim
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Young-Jin Jeong
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Sein Jang
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
| | - Hyun-Sung Kim
- Department of Pathology, Hanyang University College of Medicine, Seoul 04673, Korea;
| | - Chul-Su Yang
- Center for Bionano Intelligence Education and Research, Ansan 15588, Korea; (W.S.); (H.-I.J.); (H.-K.K.); (Y.-J.J.); (S.J.)
- Department of Molecular and Life Science, Hanyang University, Ansan 15588, Korea; (S.K.); (D.-G.K.)
- Correspondence: ; Tel.: +82-31-400-5519; Fax: +82-31-436-8153
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19
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Felix L, Mylonakis E, Fuchs BB. Thioredoxin Reductase Is a Valid Target for Antimicrobial Therapeutic Development Against Gram-Positive Bacteria. Front Microbiol 2021; 12:663481. [PMID: 33936021 PMCID: PMC8085250 DOI: 10.3389/fmicb.2021.663481] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 03/29/2021] [Indexed: 12/13/2022] Open
Abstract
There is a drought of new antibacterial compounds that exploit novel targets. Thioredoxin reductase (TrxR) from the Gram-positive bacterial antioxidant thioredoxin system has emerged from multiple screening efforts as a potential target for auranofin, ebselen, shikonin, and allicin. Auranofin serves as the most encouraging proof of concept drug, demonstrating TrxR inhibition can result in bactericidal effects and inhibit Gram-positive bacteria in both planktonic and biofilm states. Minimal inhibitory concentrations are on par or lower than gold standard medications, even among drug resistant isolates. Importantly, existing drug resistance mechanisms that challenge treatment of infections like Staphylococcus aureus do not confer resistance to TrxR targeting compounds. The observed inhibition by multiple compounds and inability to generate a bacterial genetic mutant demonstrate TrxR appears to play an essential role in Gram-positive bacteria. These findings suggest TrxR can be exploited further for drug development. Examining the interaction between TrxR and these proof of concept compounds illustrates that compounds representing a new antimicrobial class can be developed to directly interact and inhibit the validated target.
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Affiliation(s)
- LewisOscar Felix
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Eleftherios Mylonakis
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Beth Burgwyn Fuchs
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
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20
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Rankine-Wilson LI, Shapira T, Sao Emani C, Av-Gay Y. From infection niche to therapeutic target: the intracellular lifestyle of Mycobacterium tuberculosis. MICROBIOLOGY (READING, ENGLAND) 2021; 167:001041. [PMID: 33826491 PMCID: PMC8289223 DOI: 10.1099/mic.0.001041] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 02/15/2021] [Indexed: 12/16/2022]
Abstract
Mycobacterium tuberculosis (Mtb) is an obligate human pathogen killing millions of people annually. Treatment for tuberculosis is lengthy and complicated, involving multiple drugs and often resulting in serious side effects and non-compliance. Mtb has developed numerous complex mechanisms enabling it to not only survive but replicate inside professional phagocytes. These mechanisms include, among others, overcoming the phagosome maturation process, inhibiting the acidification of the phagosome and inhibiting apoptosis. Within the past decade, technologies have been developed that enable a more accurate understanding of Mtb physiology within its intracellular niche, paving the way for more clinically relevant drug-development programmes. Here we review the molecular biology of Mtb pathogenesis offering a unique perspective on the use and development of therapies that target Mtb during its intracellular life stage.
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Affiliation(s)
| | - Tirosh Shapira
- Division of Infectious Disease, Department of Medicine, The University of British Columbia, Vancouver, Canada
| | - Carine Sao Emani
- Division of Infectious Disease, Department of Medicine, The University of British Columbia, Vancouver, Canada
| | - Yossef Av-Gay
- Department of Microbiology & Immunology, The University of British Columbia, Vancouver, Canada
- Division of Infectious Disease, Department of Medicine, The University of British Columbia, Vancouver, Canada
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21
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Grover S, Engelhart CA, Pérez-Herrán E, Li W, Abrahams KA, Papavinasasundaram K, Bean JM, Sassetti CM, Mendoza-Losana A, Besra GS, Jackson M, Schnappinger D. Two-Way Regulation of MmpL3 Expression Identifies and Validates Inhibitors of MmpL3 Function in Mycobacterium tuberculosis. ACS Infect Dis 2021; 7:141-152. [PMID: 33319550 PMCID: PMC7802072 DOI: 10.1021/acsinfecdis.0c00675] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
![]()
MmpL3,
an essential mycolate transporter in the inner membrane
of Mycobacterium tuberculosis (Mtb), has been identified as a target of multiple, chemically diverse
antitubercular drugs. However, several of these molecules seem to
have secondary targets and inhibit bacterial growth by more than one
mechanism. Here, we describe a cell-based assay that utilizes two-way
regulation of MmpL3 expression to readily identify MmpL3-specific
inhibitors. We successfully used this assay to identify a novel guanidine-based
MmpL3 inhibitor from a library of 220 compounds that inhibit growth
of Mtb by largely unknown mechanisms. We furthermore
identified inhibitors of cytochrome bc1-aa3 oxidase as one class of off-target hits in whole-cell screens for
MmpL3 inhibitors and report a novel sulfanylacetamide as a potential
QcrB inhibitor.
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Affiliation(s)
- Shipra Grover
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York 10065, United States
| | - Curtis A. Engelhart
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York 10065, United States
| | - Esther Pérez-Herrán
- TB Research Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Wei Li
- Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Katherine A. Abrahams
- Institute of Microbiology and Infection, School of Biological Sciences, University of Birmingham, Birmingham B15 2TT, U.K
| | - Kadamba Papavinasasundaram
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts 01655, United States
| | - James M. Bean
- Sloan Kettering Institute, New York, New York 10065, United States
| | - Christopher M. Sassetti
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts 01655, United States
| | - Alfonso Mendoza-Losana
- TB Research Unit, Global Health R&D, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, Madrid 28760, Spain
| | - Gurdyal S. Besra
- Institute of Microbiology and Infection, School of Biological Sciences, University of Birmingham, Birmingham B15 2TT, U.K
| | - Mary Jackson
- Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Dirk Schnappinger
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York 10065, United States
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22
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Harnagel A, Lopez Quezada L, Park SW, Baranowski C, Kieser K, Jiang X, Roberts J, Vaubourgeix J, Yang A, Nelson B, Fay A, Rubin E, Ehrt S, Nathan C, Lupoli TJ. Nonredundant functions of Mycobacterium tuberculosis chaperones promote survival under stress. Mol Microbiol 2020; 115:272-289. [PMID: 32996193 DOI: 10.1111/mmi.14615] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/21/2020] [Accepted: 09/22/2020] [Indexed: 12/12/2022]
Abstract
Bacterial chaperones ClpB and DnaK, homologs of the respective eukaryotic heat shock proteins Hsp104 and Hsp70, are essential in the reactivation of toxic protein aggregates that occur during translation or periods of stress. In the pathogen Mycobacterium tuberculosis (Mtb), the protective effect of chaperones extends to survival in the presence of host stresses, such as protein-damaging oxidants. However, we lack a full understanding of the interplay of Hsps and other stress response genes in mycobacteria. Here, we employ genome-wide transposon mutagenesis to identify the genes that support clpB function in Mtb. In addition to validating the role of ClpB in Mtb's response to oxidants, we show that HtpG, a homolog of Hsp90, plays a distinct role from ClpB in the proteotoxic stress response. While loss of neither clpB nor htpG is lethal to the cell, loss of both through genetic depletion or small molecule inhibition impairs recovery after exposure to host-like stresses, especially reactive nitrogen species. Moreover, defects in cells lacking clpB can be complemented by overexpression of other chaperones, demonstrating that Mtb's stress response network depends upon finely tuned chaperone expression levels. These results suggest that inhibition of multiple chaperones could work in concert with host immunity to disable Mtb.
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Affiliation(s)
- Alexa Harnagel
- Department of Chemistry, New York University, New York, NY, USA
| | - Landys Lopez Quezada
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Sae Woong Park
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Catherine Baranowski
- Department of Immunology and Infectious Disease, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Karen Kieser
- Department of Immunology and Infectious Disease, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Xiuju Jiang
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Julia Roberts
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Julien Vaubourgeix
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Amy Yang
- Department of Chemistry, New York University, New York, NY, USA
| | - Brock Nelson
- Department of Chemistry, New York University, New York, NY, USA
| | - Allison Fay
- Immunology Program, Sloan Kettering Institute, New York, NY, USA
| | - Eric Rubin
- Immunology Program, Sloan Kettering Institute, New York, NY, USA
| | - Sabine Ehrt
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Carl Nathan
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
| | - Tania J Lupoli
- Department of Chemistry, New York University, New York, NY, USA.,Department of Microbiology and Immunology, Weill Cornell Medicine, New York, NY, USA
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23
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Farias APFD, Rocha Filho JTR, Marchioro SB, Moreira LS, Marques AS, Sá MDCAD, Oliveira AADS, Alcântara ME, Mariutti RB, Arni RK, Trindade SC, Meyer R. rSodC is a potential antigen to diagnose Corynebacterium pseudotuberculosis by enzyme-linked immunoassay. AMB Express 2020; 10:186. [PMID: 33074348 PMCID: PMC7570411 DOI: 10.1186/s13568-020-01125-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 10/10/2020] [Indexed: 12/03/2022] Open
Abstract
Caseous lymphadenitis (CL) is a chronic infectious disease that affects sheep and goats. Many serological tests have been developed to detect the disease; one of the most widely used is the enzyme-linked immunosorbent assay (ELISA), due to its advantages, which include acceptable cost-effectiveness, applicability, sensitivity and specificity. ELISA formulations using recombinant proteins can exhibit significant sensitivity and specificity when using a single purified antigen. DTxR, Trx, TrxR, LexA, SodC, SpaC, NanH, and PknG recombinant proteins can be considered target proteins for ELISA development due to its extracellular or on the cell surface location, which allows a better recognition by the immune system. Therefore, the objectives of this study were to evaluate the antigenic reactivity of Corynebacterium pseudotuberculosis recombinant proteins in goat and sheep serum. Of eight proteins evaluated, rSodC was selected for validation assays with small ruminant serum samples from the semiarid region of the state of Bahia, Brazil. Validation assays with goat serum samples showed that ELISA-rSodC presented sensitivity and specificity of 96% and 94%, respectively. Validation assays with sheep serum showed that ELISA-rSodC exhibited sensitivity and specificity of 95% and 98%, respectively. Analysis of 756 field serum samples showed that rSodC identified 95 positive samples (23%) in goats and 75 positive samples (21%) in sheep. The ELISA with recombinant SodC protein developed in this study discriminated positive and negative serum samples with high levels of sensitivity and specificity. This formulation is promising for epidemiological surveys and CL control programs. Trial registration AEC No 4958051018. 12/18/2018, retrospectively registered
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24
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Bancroft PJ, Turapov O, Jagatia H, Arnvig KB, Mukamolova GV, Green J. Coupling of Peptidoglycan Synthesis to Central Metabolism in Mycobacteria: Post-transcriptional Control of CwlM by Aconitase. Cell Rep 2020; 32:108209. [PMID: 32997986 PMCID: PMC7527780 DOI: 10.1016/j.celrep.2020.108209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 06/18/2020] [Accepted: 09/09/2020] [Indexed: 10/25/2022] Open
Abstract
Mycobacterium tuberculosis causes human tuberculosis, and a better understanding of its biology is required to identify vulnerabilities that might be exploited in developing new therapeutics. The iron-sulfur cluster of the essential M. tuberculosis central metabolic enzyme, aconitase (AcnA), disassembles when exposed to oxidative/nitrosative stress or iron chelators. The catalytically inactive apo-AcnA interacts with a sequence resembling an iron-responsive element (IRE) located within the transcript of another essential protein, CwlM, a regulator of peptidoglycan synthesis. A Mycobacterium smegmatis cwlM conditional mutant complemented with M. tuberculosis cwlM with a disrupted IRE is unable to recover from combinations of oxidative, nitrosative, and iron starvation stresses. An equivalent M. tuberculosis cwlM conditional mutant complemented with the cwlM gene lacking a functional IRE exhibits a growth defect in THP-1 macrophages. It appears that AcnA acts to couple peptidoglycan synthesis and central metabolism, and disruption of this coupling potentially leaves mycobacteria vulnerable to attack by macrophages.
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Affiliation(s)
- Peter J Bancroft
- Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK
| | - Obolbek Turapov
- Leicester Tuberculosis Research Group, Department of Respiratory Sciences, University of Leicester, Maurice Shock Medical Sciences Building, University Road, Leicester, LE1 9HN, UK
| | - Heena Jagatia
- Leicester Tuberculosis Research Group, Department of Respiratory Sciences, University of Leicester, Maurice Shock Medical Sciences Building, University Road, Leicester, LE1 9HN, UK
| | - Kristine B Arnvig
- Institute for Structural and Molecular Biology, University College London, London, WC1E 6BT, UK
| | - Galina V Mukamolova
- Leicester Tuberculosis Research Group, Department of Respiratory Sciences, University of Leicester, Maurice Shock Medical Sciences Building, University Road, Leicester, LE1 9HN, UK.
| | - Jeffrey Green
- Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK.
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25
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Sun J, Hang Y, Han Y, Zhang X, Gan L, Cai C, Chen Z, Yang Y, Song Q, Shao C, Yang Y, Zhou Y, Wang X, Cheng C, Song H. Deletion of glutaredoxin promotes oxidative tolerance and intracellular infection in Listeria monocytogenes. Virulence 2020; 10:910-924. [PMID: 31680614 PMCID: PMC6844310 DOI: 10.1080/21505594.2019.1685640] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Thiol-disulfide glutaredoxin systems of bacterial cytoplasm favor reducing conditions for the correct disulfide bonding of functional proteins, and therefore were employed by bacteria to defend against oxidative stress. Listeria monocytogenes has been shown to encode a putative glutaredoxin, Grx (encoded by lmo2344), while the underlying roles remain unknown. Here we suggest an unexpected role of L. monocytogenes Grx in oxidative tolerance and intracellular infection. The recombinant Grx was able to efficiently catalyze the thiol-disulfide oxidoreduction of insulin in the presence of DTT as an election donor. Unexpectedly, the deletion of grx resulted in a remarkably increased tolerance and survival ability of this bacteria when exposed to various oxidizing agents, including diamide, and copper and cadmium ions. Furthermore, loss of grx significantly promoted bacterial invasion and proliferation in human epithelial Caco-2 cells and murine macrophages, as well as a notably increasing invasion but not cell-to-cell spread in the murine fibroblasts L929 cells. More importantly, L. monocytogenes lacking the glutaredoxin exhibited more efficient proliferation and recovery in the spleens and livers of the infected mice, and hence became more virulent by upregulating the virulence factors, InlA and InlB. In summary, we here for the first time demonstrated that L. monocytogenes glutaredoxin plays a counterintuitive role in bacterial oxidative resistance and intracellular infection, which is the first report to provide valuable evidence for the role of glutaredoxins in bacterial infection, and more importantly suggests a favorable model to illustrate the functional diversity of bacterial Grx systems during environmental adaption and host infection.
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Affiliation(s)
- Jing Sun
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Yi Hang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Yue Han
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Xian Zhang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Li Gan
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Chang Cai
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China.,School of Veterinary and Life Sciences, Murdoch University, Murdoch, Australia
| | - Zhongwei Chen
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Yang Yang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Quanjiang Song
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Chunyan Shao
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Yongchun Yang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Yingshan Zhou
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Xiaodu Wang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Changyong Cheng
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
| | - Houhui Song
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou, P. R. China
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26
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Dev S, Khamkhash A, Ghosh T, Aggarwal S. Adsorptive Removal of Se(IV) by Citrus Peels: Effect of Adsorbent Entrapment in Calcium Alginate Beads. ACS OMEGA 2020; 5:17215-17222. [PMID: 32715207 PMCID: PMC7376897 DOI: 10.1021/acsomega.0c01347] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 06/05/2020] [Indexed: 05/13/2023]
Abstract
Selenium (Se) contamination in natural waters impacted by anthropogenic activities is becoming a prevalent and widespread problem. Investigation of novel, low-cost, and sustainable food-waste-sourced adsorbents for Se removal has largely been unexplored. Here, we report on the Se(IV) biosorption from a liquid solution using three waste-derived/low-cost biosorbents, namely citrus peels (bare), Ca-alginate gel beads, and Ca-alginate-citrus peels composite beads (Ca-alginate@citrus). The entrapment of citrus peels by Ca-alginate not only provided a structural framework for the citrus peel particles but also preserved the high-efficiency Se(IV) removal property of the citrus peels. From the modeling results, it was established that Se(IV) biosorption followed the fixed-film diffusion model, along with pseudo-second-order kinetics. Investigation of pH impacts along with initial dosing of sorbent/sorbate demonstrated that all of the three biosorbents exhibited optimum biosorption of Se(IV) at pH 6-8, 50-75 mg·L-1 of Se(IV), and 1-5 mg·L-1 of biosorbent. Overall, the maximum Se(IV) biosorption capacities were measured to be 116.2, 72.1, and 111.9 mg·g-1 for citrus peels, Ca-alginate, and Ca-alginate@citrus, respectively, with citrus peels (bare and immobilized) showing among the highest reported values in the literature for Se(IV) adsorption. This work provides a platform for the future development of an efficient filtration system using Ca-alginate@citrus as an inexpensive, novel, and sustainable biosorbent to treat Se(IV) contaminated water.
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Affiliation(s)
- Subhabrata Dev
- Institute
of Northern Engineering, University of Alaska
Fairbanks, Duck 403, 1760 Tanana Loop, Fairbanks, Alaska 99775, United States
- Mineral
Industry Research Laboratory, University
of Alaska Fairbanks, Fairbanks, Alaska 99775, United States
- . Phone: +1 907 474 6746
| | - Aibyek Khamkhash
- Mineral
Industry Research Laboratory, University
of Alaska Fairbanks, Fairbanks, Alaska 99775, United States
- Nevada
Gold Mines, Barrick Gold Corporation, Elko, Nevada 89801, United States
| | - Tathagata Ghosh
- Mineral
Industry Research Laboratory, University
of Alaska Fairbanks, Fairbanks, Alaska 99775, United States
| | - Srijan Aggarwal
- Department
of Civil and Environmental Engineering, University of Alaska Fairbanks, ELIF 360, 1764 Tanana Loop, Fairbanks, Alaska 99775, United States
- . Phone: +1 907
474 6120
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27
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Mavi PS, Singh S, Kumar A. Reductive Stress: New Insights in Physiology and Drug Tolerance of Mycobacterium. Antioxid Redox Signal 2020; 32:1348-1366. [PMID: 31621379 DOI: 10.1089/ars.2019.7867] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Significance:Mycobacterium tuberculosis (Mtb) encounters reductive stress during its infection cycle. Notably, host-generated protective responses, such as acidic pH inside phagosomes and lysosomes, exposure to glutathione in alveolar hypophase (i.e., a thin liquid lining consisting of surfactant and proteins in the alveolus), and hypoxic environments inside granulomas are associated with the accumulation of reduced cofactors, such as nicotinamide adenine dinucleotide (reduced form), nicotinamide adenine dinucleotide phosphate, flavin adenine dinucleotide (reduced form), and nonprotein thiols (e.g., mycothiol), leading to reductive stress in Mtb cells. Dissipation of this reductive stress is important for survival of the bacterium. If reductive stress is not dissipated, it leads to generation of reactive oxygen species, which may be fatal for the cells. Recent Advances: This review focuses on mechanisms utilized by mycobacteria to sense and respond to reductive stress. Importantly, exposure of Mtb cells to reductive stress leads to growth inhibition, altered metabolism, modulation of virulence, and drug tolerance. Mtb is equipped with thiol buffering systems of mycothiol and ergothioneine to protect itself from various redox stresses. These systems are complemented by thioredoxin and thioredoxin reductase (TR) systems for maintaining cellular redox homeostasis. A diverse array of sensors is used by Mycobacterium for monitoring its intracellular redox status. Upon sensing reductive stress, Mtb uses a flexible and robust metabolic system for its dissipation. Branched electron transport chain allows Mycobacterium to function with different terminal electron acceptors and modulate proton motive force to fulfill energy requirements under diverse scenarios. Interestingly, Mtb utilizes variations in the tricarboxylic cycle and a number of dehydrogenases to dissipate reductive stress. Upon prolonged exposure to reductive stress, Mtb utilizes biosynthesis of storage and virulence lipids as a dissipative mechanism. Critical Issues: The mechanisms utilized by Mycobacterium for sensing and tackling reductive stress are not well characterized. Future Directions: The precise role of thiol buffering and TR systems in neutralizing reductive stress is not well defined. Genetic systems that respond to metabolic reductive stress and thiol reductive stress need to be mapped. Genetic screens could aid in identification of such systems. Given that management of reductive stress is critical for both actively replicating and persister mycobacteria, an improved understanding of the mechanisms used by mycobacteria for dissipation of reductive stress may lead to identification of vulnerable choke points that could be targeted for killing Mtb in vivo.
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Affiliation(s)
- Parminder Singh Mavi
- Institute of Microbial Technology, Council of Scientific and Industrial Research, Chandigarh, India
| | - Shweta Singh
- Institute of Microbial Technology, Council of Scientific and Industrial Research, Chandigarh, India
| | - Ashwani Kumar
- Institute of Microbial Technology, Council of Scientific and Industrial Research, Chandigarh, India.,Academy of Scientific and Innovative Research, Ghaziabad, India
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28
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Gengenbacher M, Zimmerman MD, Sarathy JP, Kaya F, Wang H, Mina M, Carter C, Hossen MA, Su H, Trujillo C, Ehrt S, Schnappinger D, Dartois V. Tissue Distribution of Doxycycline in Animal Models of Tuberculosis. Antimicrob Agents Chemother 2020; 64:e02479-19. [PMID: 32041718 PMCID: PMC7179585 DOI: 10.1128/aac.02479-19] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 02/06/2020] [Indexed: 01/31/2023] Open
Abstract
Doxycycline, an FDA-approved tetracycline, is used in tuberculosis in vivo models for the temporal control of mycobacterial gene expression. In these models, animals are infected with recombinant Mycobacterium tuberculosis carrying genes of interest under transcriptional control of the doxycycline-responsive TetR-tetO unit. To minimize fluctuations of plasma levels, doxycycline is usually administered in the diet. However, tissue penetration studies to identify the minimum doxycycline content in food achieving complete repression of TetR-controlled genes in tuberculosis (TB)-infected organs and lesions have not been conducted. Here, we first determined the tetracycline concentrations required to achieve silencing of M. tuberculosis target genes in vitro Next, we measured doxycycline concentrations in plasma, major organs, and lung lesions in TB-infected mice and rabbits and compared these values to silencing concentrations measured in vitro We found that 2,000 ppm doxycycline supplemented in mouse and rabbit feed is sufficient to reach target concentrations in TB lesions. In rabbit chow, the calcium content had to be reduced 5-fold to minimize chelation of doxycycline and deliver adequate oral bioavailability. Clearance kinetics from major organs and lung lesions revealed that doxycycline levels fall below concentrations that repress tet promoters within 7 to 14 days after doxycycline is removed from the diet. In summary, we have shown that 2,000 ppm doxycycline supplemented in standard mouse diet and in low-calcium rabbit diet delivers concentrations adequate to achieve full repression of tet promoters in infected tissues of mice and rabbits.
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Affiliation(s)
- Martin Gengenbacher
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Matthew D Zimmerman
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Jansy P Sarathy
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Firat Kaya
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Han Wang
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Marizel Mina
- New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Claire Carter
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Md Amir Hossen
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
| | - Hongwei Su
- Weill Cornell Medical College, New York, New York, USA
| | | | - Sabine Ehrt
- Weill Cornell Medical College, New York, New York, USA
| | | | - Véronique Dartois
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, New Jersey, USA
- New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
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29
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Antibiotics in the clinical pipeline in October 2019. J Antibiot (Tokyo) 2020; 73:329-364. [PMID: 32152527 PMCID: PMC7223789 DOI: 10.1038/s41429-020-0291-8] [Citation(s) in RCA: 167] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/30/2020] [Accepted: 01/30/2020] [Indexed: 12/27/2022]
Abstract
The development of new and effective antibacterial drugs to treat multi-drug resistant (MDR) bacteria, especially Gram-negative (G−ve) pathogens, is acknowledged as one of the world’s most pressing health issues; however, the discovery and development of new, nontoxic antibacterials is not a straightforward scientific task, which is compounded by a challenging economic model. This review lists the antibacterials, β-lactamase/β-lactam inhibitor (BLI) combinations, and monoclonal antibodies (mAbs) first launched around the world since 2009 and details the seven new antibiotics and two new β-lactam/BLI combinations launched since 2016. The development status, mode of action, spectra of activity, lead source, and administration route for the 44 small molecule antibacterials, eight β-lactamase/BLI combinations, and one antibody drug conjugate (ADC) being evaluated in worldwide clinical trials at the end of October 2019 are described. Compounds discontinued from clinical development since 2016 and new antibacterial pharmacophores are also reviewed. There has been an increase in the number of early stage clinical candidates, which has been fueled by antibiotic-focused funding agencies; however, there is still a significant gap in the pipeline for the development of new antibacterials with activity against β-metallolactamases, orally administered with broad spectrum G−ve activity, and new treatments for MDR Acinetobacter and gonorrhea.
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30
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Tiwari D, Park SW, Essawy MM, Dawadi S, Mason A, Nandakumar M, Zimmerman M, Mina M, Ho HP, Engelhart CA, Ioerger T, Sacchettini JC, Rhee K, Ehrt S, Aldrich CC, Dartois V, Schnappinger D. Targeting protein biotinylation enhances tuberculosis chemotherapy. Sci Transl Med 2019; 10:10/438/eaal1803. [PMID: 29695454 PMCID: PMC6151865 DOI: 10.1126/scitranslmed.aal1803] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Revised: 07/28/2017] [Accepted: 10/03/2017] [Indexed: 12/28/2022]
Abstract
Successful drug treatment for tuberculosis (TB) depends on the unique contributions of its component drugs. Drug resistance poses a threat to the efficacy of individual drugs and the regimens to which they contribute. Biologically and chemically validated targets capable of replacing individual components of current TB chemotherapy are a major unmet need in TB drug development. We demonstrate that chemical inhibition of the bacterial biotin protein ligase (BPL) with the inhibitor Bio-AMS (5'-[N-(d-biotinoyl)sulfamoyl]amino-5'-deoxyadenosine) killed Mycobacterium tuberculosis (Mtb), the bacterial pathogen causing TB. We also show that genetic silencing of BPL eliminated the pathogen efficiently from mice during acute and chronic infection with Mtb Partial chemical inactivation of BPL increased the potency of two first-line drugs, rifampicin and ethambutol, and genetic interference with protein biotinylation accelerated clearance of Mtb from mouse lungs and spleens by rifampicin. These studies validate BPL as a potential drug target that could serve as an alternate frontline target in the development of new drugs against Mtb.
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Affiliation(s)
- Divya Tiwari
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10021, USA
| | - Sae Woong Park
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10021, USA
| | - Maram M Essawy
- Department of Medicinal Chemistry, University of Minnesota, 308 Harvard Street Southeast, 8-174 WDH, Minneapolis, MN 55455, USA
| | - Surendra Dawadi
- Department of Medicinal Chemistry, University of Minnesota, 308 Harvard Street Southeast, 8-174 WDH, Minneapolis, MN 55455, USA
| | - Alan Mason
- Public Health Research Institute, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Madhumitha Nandakumar
- Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021, USA
| | - Matthew Zimmerman
- Public Health Research Institute, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Marizel Mina
- Public Health Research Institute, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Hsin Pin Ho
- Public Health Research Institute, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Curtis A Engelhart
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10021, USA
| | - Thomas Ioerger
- Department of Computer Science and Engineering, Texas A&M University, College Station, TX 77843, USA
| | - James C Sacchettini
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA
| | - Kyu Rhee
- Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021, USA
| | - Sabine Ehrt
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10021, USA
| | - Courtney C Aldrich
- Department of Medicinal Chemistry, University of Minnesota, 308 Harvard Street Southeast, 8-174 WDH, Minneapolis, MN 55455, USA
| | - Véronique Dartois
- Public Health Research Institute, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA. .,Department of Medicine, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ 07103, USA
| | - Dirk Schnappinger
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10021, USA.
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Potentials of Host-Directed Therapies in Tuberculosis Management. J Clin Med 2019; 8:jcm8081166. [PMID: 31382631 PMCID: PMC6723166 DOI: 10.3390/jcm8081166] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 07/24/2019] [Accepted: 08/02/2019] [Indexed: 01/02/2023] Open
Abstract
Tuberculosis (TB) remains as a leading cause of mortality in developing countries, persisting as a major threat to the global public health. Current treatment involving a long antibiotic regimen brings concern to the topic of patient compliance, contributing to the emergence of drug resistant TB. The current review will provide an updated outlook on novel anti-TB therapies that can be given as adjunctive agents to current anti-TB treatments, with a particular focus on modulating the host immune response to effectively target all forms of TB. Additional potential therapeutic pathway targets, including lipid metabolism alteration and vascular endothelial growth factor (VEGF)-directed therapies, are discussed.
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May HC, Yu JJ, Zhang H, Wang Y, Cap AP, Chambers JP, Guentzel MN, Arulanandam BP. Thioredoxin-A is a virulence factor and mediator of the type IV pilus system in Acinetobacter baumannii. PLoS One 2019; 14:e0218505. [PMID: 31265467 PMCID: PMC6605650 DOI: 10.1371/journal.pone.0218505] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 06/04/2019] [Indexed: 01/08/2023] Open
Abstract
The Gram-negative pathogen, Acinetobacter baumannii has emerged as a global nosocomial health threat affecting the majority of hospitals in the U.S. and abroad. The redox protein thioredoxin has been shown to play several roles in modulation of cellular functions affecting various virulence factors in Gram-negative pathogens. This study aims to explore the role of thioredoxin-A protein (TrxA) in A. baumannii virulence. We determined that deletion of the TrxA gene did not significantly affect resistance to environmental stressors such as temperature, salt, and pH. However, TrxA was critical for survival in the presence of elevated levels of hydrogen peroxide. Lack of TrxA was associated with decreased expression of type IV pili related genes and an inability to undergo normal twitching motility. Interestingly, the TrxA-null mutant was able to form biofilms better than the wildtype (WT) and was observed to be significantly less virulent than the WT in a pulmonary infection model. These results are supportive of thioredoxin playing a key role in A. baumannii virulence.
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Affiliation(s)
- Holly C. May
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Jieh-Juen Yu
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Hao Zhang
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Yufeng Wang
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Andrew P. Cap
- Coagulation and Blood Research Program, US Army Institute for Surgical Research, JBSA Fort Sam Houston, San Antonio, Texas, United States of America
| | - James P. Chambers
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - M. Neal Guentzel
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Bernard P. Arulanandam
- South Texas Center for Emerging Infectious Disease and Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
- * E-mail:
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Haider T, Tiwari R, Vyas SP, Soni V. Molecular determinants as therapeutic targets in cancer chemotherapy: An update. Pharmacol Ther 2019; 200:85-109. [PMID: 31047907 DOI: 10.1016/j.pharmthera.2019.04.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 04/25/2019] [Indexed: 02/06/2023]
Abstract
It is well known that cancer cells are heterogeneous in nature and very distinct from their normal counterparts. Commonly these cancer cells possess different and complementary metabolic profile, microenvironment and adopting behaviors to generate more ATPs to fulfill the requirement of high energy that is further utilized in the production of proteins and other essentials required for cell survival, growth, and proliferation. These differences create many challenges in cancer treatments. On the contrary, such situations of metabolic differences between cancer and normal cells may be expected a promising strategy for treatment purpose. In this article, we focus on the molecular determinants of oncogene-specific sub-organelles such as potential metabolites of mitochondria (reactive oxygen species, apoptotic proteins, cytochrome c, caspase 9, caspase 3, etc.), endoplasmic reticulum (unfolded protein response, PKR-like ER kinase, C/EBP homologous protein, etc.), nucleus (nucleolar phosphoprotein, nuclear pore complex, nuclear localization signal), lysosome (microenvironment, etc.) and plasma membrane phospholipids, etc. that might be exploited for the targeted delivery of anti-cancer drugs for therapeutic benefits. This review will help to understand the various targets of subcellular organelles at molecular levels. In the future, this molecular level understanding may be combined with the genomic profile of cancer for the development of the molecularly guided or personalized therapeutics for complete eradication of cancer.
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Affiliation(s)
- Tanweer Haider
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University, Sagar, Madhya Pradesh 470003, India
| | - Rahul Tiwari
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University, Sagar, Madhya Pradesh 470003, India
| | - Suresh Prasad Vyas
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University, Sagar, Madhya Pradesh 470003, India
| | - Vandana Soni
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University, Sagar, Madhya Pradesh 470003, India.
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Kanvatirth P, Jeeves RE, Bacon J, Besra GS, Alderwick LJ. Utilisation of the Prestwick Chemical Library to identify drugs that inhibit the growth of mycobacteria. PLoS One 2019; 14:e0213713. [PMID: 30861059 PMCID: PMC6414029 DOI: 10.1371/journal.pone.0213713] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 02/27/2019] [Indexed: 11/19/2022] Open
Abstract
Tuberculosis (TB) is an infectious bacterial disease that kills approximately 1.3 million people every year. Despite global efforts to reduce both the incidence and mortality associated with TB, the emergence of drug resistant strains has slowed any progress made towards combating the spread of this deadly disease. The current TB drug regimen is inadequate, takes months to complete and poses significant challenges when administering to patients suffering from drug resistant TB. New treatments that are faster, simpler and more affordable are urgently required. Arguably, a good strategy to discover new drugs is to start with an old drug. Here, we have screened a library of 1200 FDA approved drugs from the Prestwick Chemical library using a GFP microplate assay. Drugs were screened against GFP expressing strains of Mycobacterium smegmatis and Mycobacterium bovis BCG as surrogates for Mycobacterium tuberculosis, the causative agent of TB in humans. We identified several classes of drugs that displayed antimycobacterial activity against both M. smegmatis and BCG, however each organism also displayed some selectivity towards certain drug classes. Variant analysis of whole genomes sequenced for resistant mutants raised to florfenicol, vanoxerine and pentamidine highlight new pathways that could be exploited in drug repurposing programmes.
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Affiliation(s)
- Panchali Kanvatirth
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Rose E. Jeeves
- TB Research Group, National Infection Service, Public Health England, Porton Down, Salisbury, United Kingdom
| | - Joanna Bacon
- TB Research Group, National Infection Service, Public Health England, Porton Down, Salisbury, United Kingdom
| | - Gurdyal S. Besra
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Luke J. Alderwick
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
- * E-mail:
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35
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Liu H, Shukla S, Vera-González N, Tharmalingam N, Mylonakis E, Fuchs BB, Shukla A. Auranofin Releasing Antibacterial and Antibiofilm Polyurethane Intravascular Catheter Coatings. Front Cell Infect Microbiol 2019; 9:37. [PMID: 30873389 PMCID: PMC6403144 DOI: 10.3389/fcimb.2019.00037] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 02/07/2019] [Indexed: 12/18/2022] Open
Abstract
Intravascular catheter related bloodstream infections (CRBSIs) are a leading cause of hospital-acquired infections worldwide, resulting not only in the burden of cost and morbidity for patients but also in the over-consumption of medical resources for hospitals and health care organizations. In this study, a novel auranofin releasing antibacterial and antibiofilm polyurethane (PU) catheter coating was developed and investigated for future use in preventing CRBSIs. Auranofin is an antirheumatic drug with recently identified antimicrobial properties. The drug carrier, PU, acts as a barrier surrounding the antibacterial agent, auranofin, to extend the drug release profile and improve its long-term antibacterial and antibiofilm efficacy and potentially the length of catheter implantation within a patient. The PU+auranofin coatings developed here were found to be highly stretchable (exhibiting ~500% percent elongation), which is important for the compliance of the material on a flexible catheter. PU+auranofin coated catheters were able to inhibit the growth of methicillin-resistant Staphylococcus aureus (MRSA) for 8 to 26 days depending on the specific drug concentration utilized during the dip coating process. The PU+auranofin coated catheters were also able to completely inhibit MRSA biofilm formation in vitro, an effect that was not observed with auranofin or PU alone. Lastly, these coatings were found to be hemocompatible with human erythrocytes and maintain liver cell viability.
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Affiliation(s)
- Hanyang Liu
- Center for Biomedical Engineering, School of Engineering, Institute for Molecular and Nanoscale Innovation, Brown University, Providence, RI, United States
| | - Shashank Shukla
- Center for Biomedical Engineering, School of Engineering, Institute for Molecular and Nanoscale Innovation, Brown University, Providence, RI, United States
| | - Noel Vera-González
- Center for Biomedical Engineering, School of Engineering, Institute for Molecular and Nanoscale Innovation, Brown University, Providence, RI, United States
| | - Nagendran Tharmalingam
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Eleftherios Mylonakis
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Beth Burgwyn Fuchs
- Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School and Brown University, Providence, RI, United States
| | - Anita Shukla
- Center for Biomedical Engineering, School of Engineering, Institute for Molecular and Nanoscale Innovation, Brown University, Providence, RI, United States
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36
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Chawla M, Mishra S, Anand K, Parikh P, Mehta M, Vij M, Verma T, Singh P, Jakkala K, Verma HN, AjitKumar P, Ganguli M, Narain Seshasayee AS, Singh A. Redox-dependent condensation of the mycobacterial nucleoid by WhiB4. Redox Biol 2018; 19:116-133. [PMID: 30149290 PMCID: PMC6111044 DOI: 10.1016/j.redox.2018.08.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 08/02/2018] [Accepted: 08/11/2018] [Indexed: 12/22/2022] Open
Abstract
Oxidative stress response in bacteria is mediated through coordination between the regulators of oxidant-remediation systems (e.g. OxyR, SoxR) and nucleoid condensation (e.g. Dps, Fis). However, these genetic factors are either absent or rendered non-functional in the human pathogen Mycobacterium tuberculosis (Mtb). Therefore, how Mtb organizes genome architecture and regulates gene expression to counterbalance oxidative imbalance is unknown. Here, we report that an intracellular redox-sensor, WhiB4, dynamically links genome condensation and oxidative stress response in Mtb. Disruption of WhiB4 affects the expression of genes involved in maintaining redox homeostasis, central metabolism, and respiration under oxidative stress. Notably, disulfide-linked oligomerization of WhiB4 in response to oxidative stress activates the protein’s ability to condense DNA. Further, overexpression of WhiB4 led to hypercondensation of nucleoids, redox imbalance and increased susceptibility to oxidative stress, whereas WhiB4 disruption reversed this effect. In accordance with the findings in vitro, ChIP-Seq data demonstrated non-specific binding of WhiB4 to GC-rich regions of the Mtb genome. Lastly, data indicate that WhiB4 deletion affected the expression of ~ 30% of genes preferentially bound by the protein, suggesting both direct and indirect effects on gene expression. We propose that WhiB4 structurally couples Mtb’s response to oxidative stress with genome organization and transcription. Genome condensation is involved in the management of oxidative stress in bacteria. A relation between the genome condensation and oxidative stress is unclear in Mtb. A redox sensor WhiB4 calibrates genome-condensation and antioxidants in Mtb. Over-expression of WhiB4 hyper-condensed genome and induced killing by oxidants. WhiB4 deficiency delayed genome condensation and promoted oxidative stress survival.
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Affiliation(s)
- Manbeena Chawla
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Saurabh Mishra
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Kushi Anand
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Pankti Parikh
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Mansi Mehta
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Manika Vij
- Department of Structural Biology, CSIR-Institute of Genomics and Integrative Biology, South Campus, Mathura Road, New Delhi 110020, India; Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110001, India
| | - Taru Verma
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India; Centre for BioSystems Science and Engineering (BSSE), Indian Institute of Science, Bangalore 560012, India
| | - Parul Singh
- National Centre for Biological Science, Bangalore 560065, India; SASTRA University, Thanjavur 613401, Tamil Nadu, India
| | - Kishor Jakkala
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - H N Verma
- Jaipur National University, Jagatpura, Jaipur 302017, India
| | - Parthasarathi AjitKumar
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Munia Ganguli
- Department of Structural Biology, CSIR-Institute of Genomics and Integrative Biology, South Campus, Mathura Road, New Delhi 110020, India; Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110001, India
| | | | - Amit Singh
- Department of Microbiology and Cell Biology, Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India.
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37
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Kulkarni A, Sharma AK, Chakrapani H. Redox-guided small molecule antimycobacterials. IUBMB Life 2018; 70:826-835. [DOI: 10.1002/iub.1867] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 04/14/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Amogh Kulkarni
- Department of Chemistry; Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road; Pune Maharashtra India
| | - Ajay Kumar Sharma
- Department of Chemistry; Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road; Pune Maharashtra India
| | - Harinath Chakrapani
- Department of Chemistry; Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road; Pune Maharashtra India
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38
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Lupoli TJ, Vaubourgeix J, Burns-Huang K, Gold B. Targeting the Proteostasis Network for Mycobacterial Drug Discovery. ACS Infect Dis 2018; 4:478-498. [PMID: 29465983 PMCID: PMC5902792 DOI: 10.1021/acsinfecdis.7b00231] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), remains one of the world's deadliest infectious diseases and urgently requires new antibiotics to treat drug-resistant strains and to decrease the duration of therapy. During infection, Mtb encounters numerous stresses associated with host immunity, including hypoxia, reactive oxygen and nitrogen species, mild acidity, nutrient starvation, and metal sequestration and intoxication. The Mtb proteostasis network, composed of chaperones, proteases, and a eukaryotic-like proteasome, provides protection from stresses and chemistries of host immunity by maintaining the integrity of the mycobacterial proteome. In this Review, we explore the proteostasis network as a noncanonical target for antibacterial drug discovery.
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Affiliation(s)
- Tania J. Lupoli
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413 East 69th Street, New York, New York 10021, United States
| | - Julien Vaubourgeix
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413 East 69th Street, New York, New York 10021, United States
| | - Kristin Burns-Huang
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413 East 69th Street, New York, New York 10021, United States
| | - Ben Gold
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413 East 69th Street, New York, New York 10021, United States
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May HC, Yu JJ, Guentzel MN, Chambers JP, Cap AP, Arulanandam BP. Repurposing Auranofin, Ebselen, and PX-12 as Antimicrobial Agents Targeting the Thioredoxin System. Front Microbiol 2018; 9:336. [PMID: 29556223 PMCID: PMC5844926 DOI: 10.3389/fmicb.2018.00336] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Accepted: 02/12/2018] [Indexed: 01/23/2023] Open
Abstract
As microbial resistance to drugs continues to rise at an alarming rate, finding new ways to combat pathogens is an issue of utmost importance. Development of novel and specific antimicrobial drugs is a time-consuming and expensive process. However, the re-purposing of previously tested and/or approved drugs could be a feasible way to circumvent this long and costly process. In this review, we evaluate the U.S. Food and Drug Administration tested drugs auranofin, ebselen, and PX-12 as antimicrobial agents targeting the thioredoxin system. These drugs have been shown to act on bacterial, fungal, protozoan, and helminth pathogens without significant toxicity to the host. We propose that the thioredoxin system could serve as a useful therapeutic target with broad spectrum antimicrobial activity.
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Affiliation(s)
- Holly C. May
- South Texas Center for Emerging Infectious Disease, University of Texas at San Antonio, San Antonio, TX, United States
- Center for Excellence in Infection Genomics, University of Texas at San Antonio, San Antonio, TX, United States
| | - Jieh-Juen Yu
- South Texas Center for Emerging Infectious Disease, University of Texas at San Antonio, San Antonio, TX, United States
- Center for Excellence in Infection Genomics, University of Texas at San Antonio, San Antonio, TX, United States
| | - M. N. Guentzel
- South Texas Center for Emerging Infectious Disease, University of Texas at San Antonio, San Antonio, TX, United States
- Center for Excellence in Infection Genomics, University of Texas at San Antonio, San Antonio, TX, United States
| | - James P. Chambers
- South Texas Center for Emerging Infectious Disease, University of Texas at San Antonio, San Antonio, TX, United States
- Center for Excellence in Infection Genomics, University of Texas at San Antonio, San Antonio, TX, United States
| | - Andrew P. Cap
- United States Army Institute for Surgical Research, San Antonio Military Medical Center, San Antonio, TX, United States
| | - Bernard P. Arulanandam
- South Texas Center for Emerging Infectious Disease, University of Texas at San Antonio, San Antonio, TX, United States
- Center for Excellence in Infection Genomics, University of Texas at San Antonio, San Antonio, TX, United States
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40
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Veatch AV, Kaushal D. Opening Pandora's Box: Mechanisms of Mycobacterium tuberculosis Resuscitation. Trends Microbiol 2017; 26:145-157. [PMID: 28911979 DOI: 10.1016/j.tim.2017.08.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 07/12/2017] [Accepted: 08/03/2017] [Indexed: 12/27/2022]
Abstract
Mycobacterium tuberculosis (Mtb) characteristically causes an asymptomatic infection. While this latent tuberculosis infection (LTBI) is not contagious, reactivation to active tuberculosis disease (TB) causes the patient to become infectious. A vaccine has existed for TB for a century, while drug treatments have been available for over 70 years; despite this, TB remains a major global health crisis. Understanding the factors which allow the bacillus to control responses to host stress and mechanisms leading to latency are critical for persistence. Similarly, molecular switches which respond to reactivation are important. Recently, research in the field has sought to focus on reactivation, employing system-wide approaches and animal models. Here, we describe the current work that has been done to elucidate the mechanisms of reactivation and stop reactivation in its tracks.
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Affiliation(s)
- Ashley V Veatch
- Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA, USA; Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, LA, USA
| | - Deepak Kaushal
- Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA, USA; Department of Microbiology & Immunology, Tulane University School of Medicine, New Orleans, LA, USA.
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41
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Mycobacterium tuberculosis Proteome Response to Antituberculosis Compounds Reveals Metabolic "Escape" Pathways That Prolong Bacterial Survival. Antimicrob Agents Chemother 2017; 61:AAC.00430-17. [PMID: 28416555 DOI: 10.1128/aac.00430-17] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 03/31/2017] [Indexed: 11/20/2022] Open
Abstract
Tuberculosis (TB) continues to be one of the most common bacterial infectious diseases and is the leading cause of death in many parts of the world. A major limitation of TB therapy is slow killing of the infecting organism, increasing the risk for the development of a tolerance phenotype and drug resistance. Studies indicate that Mycobacterium tuberculosis takes several days to be killed upon treatment with lethal concentrations of antibiotics both in vitro and in vivo To investigate how metabolic remodeling can enable transient bacterial survival during exposure to bactericidal concentrations of compounds, M. tuberculosis strain H37Rv was exposed to twice the MIC of isoniazid, rifampin, moxifloxacin, mefloquine, or bedaquiline for 24 h, 48 h, 4 days, and 6 days, and the bacterial proteomic response was analyzed using quantitative shotgun mass spectrometry. Numerous sets of de novo bacterial proteins were identified over the 6-day treatment. Network analysis and comparisons between the drug treatment groups revealed several shared sets of predominant proteins and enzymes simultaneously belonging to a number of diverse pathways. Overexpression of some of these proteins in the nonpathogenic Mycobacterium smegmatis extended bacterial survival upon exposure to bactericidal concentrations of antimicrobials, and inactivation of some proteins in M. tuberculosis prevented the pathogen from escaping the fast killing in vitro and in macrophages, as well. Our biology-driven approach identified promising bacterial metabolic pathways and enzymes that might be targeted by novel drugs to reduce the length of tuberculosis therapy.
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42
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43
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Botella L, Vaubourgeix J, Livny J, Schnappinger D. Depleting Mycobacterium tuberculosis of the transcription termination factor Rho causes pervasive transcription and rapid death. Nat Commun 2017; 8:14731. [PMID: 28348398 PMCID: PMC5379054 DOI: 10.1038/ncomms14731] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 01/26/2017] [Indexed: 12/30/2022] Open
Abstract
Rifampicin, which inhibits bacterial RNA polymerase, provides one of the most effective treatments for tuberculosis. Inhibition of the transcription termination factor Rho is used to treat some bacterial infections, but its importance varies across bacteria. Here we show that Rho of Mycobacterium tuberculosis functions to both define the 3' ends of mRNAs and silence substantial fragments of the genome. Brief inactivation of Rho affects over 500 transcripts enriched for genes of foreign DNA elements and bacterial virulence factors. Prolonged inactivation of Rho causes extensive pervasive transcription, a genome-wide increase in antisense transcripts, and a rapid loss of viability of replicating and non-replicating M. tuberculosis in vitro and during acute and chronic infection in mice. Collectively, these data suggest that inhibition of Rho may provide an alternative strategy to treat tuberculosis with an efficacy similar to inhibition of RNA polymerase.
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Affiliation(s)
- Laure Botella
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413E 69th Street, New York, New York 10021, USA
| | - Julien Vaubourgeix
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413E 69th Street, New York, New York 10021, USA
| | - Jonathan Livny
- Broad Institute of MIT and Harvard, 415 Main Street, Cambridge, Massachusetts 02142, USA
| | - Dirk Schnappinger
- Department of Microbiology and Immunology, Weill Cornell Medicine, 413E 69th Street, New York, New York 10021, USA
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44
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Rock JM, Hopkins FF, Chavez A, Diallo M, Chase MR, Gerrick ER, Pritchard JR, Church GM, Rubin EJ, Sassetti CM, Schnappinger D, Fortune SM. Programmable transcriptional repression in mycobacteria using an orthogonal CRISPR interference platform. Nat Microbiol 2017; 2:16274. [PMID: 28165460 PMCID: PMC5302332 DOI: 10.1038/nmicrobiol.2016.274] [Citation(s) in RCA: 305] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 12/21/2016] [Indexed: 12/19/2022]
Abstract
The development of new drug regimens that allow rapid, sterilizing treatment of tuberculosis has been limited by the complexity and time required for genetic manipulations in Mycobacterium tuberculosis. CRISPR interference (CRISPRi) promises to be a robust, easily engineered and scalable platform for regulated gene silencing. However, in M. tuberculosis, the existing Streptococcus pyogenes Cas9-based CRISPRi system is of limited utility because of relatively poor knockdown efficiency and proteotoxicity. To address these limitations, we screened eleven diverse Cas9 orthologues and identified four that are broadly functional for targeted gene knockdown in mycobacteria. The most efficacious of these proteins, the CRISPR1 Cas9 from Streptococcus thermophilus (dCas9Sth1), typically achieves 20- to 100-fold knockdown of endogenous gene expression with minimal proteotoxicity. In contrast to other CRISPRi systems, dCas9Sth1-mediated gene knockdown is robust when targeted far from the transcriptional start site, thereby allowing high-resolution dissection of gene function in the context of bacterial operons. We demonstrate the utility of this system by addressing persistent controversies regarding drug synergies in the mycobacterial folate biosynthesis pathway. We anticipate that the dCas9Sth1 CRISPRi system will have broad utility for functional genomics, genetic interaction mapping and drug-target profiling in M. tuberculosis.
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Affiliation(s)
- Jeremy M Rock
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Forrest F Hopkins
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Alejandro Chavez
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts 02138, USA
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Marieme Diallo
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Michael R Chase
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Elias R Gerrick
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Justin R Pritchard
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - George M Church
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts 02138, USA
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Eric J Rubin
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Christopher M Sassetti
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA
| | - Dirk Schnappinger
- Department of Microbiology and Immunology, Weill Cornell Medical College, New York, New York 10065, USA
| | - Sarah M Fortune
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, USA
- The Ragon Institute of MGH, Harvard and MIT, Cambridge, Massachusetts 02139, USA
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45
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Gold B, Nathan C. Targeting Phenotypically Tolerant Mycobacterium tuberculosis. Microbiol Spectr 2017; 5:10.1128/microbiolspec.TBTB2-0031-2016. [PMID: 28233509 PMCID: PMC5367488 DOI: 10.1128/microbiolspec.tbtb2-0031-2016] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Indexed: 01/08/2023] Open
Abstract
While the immune system is credited with averting tuberculosis in billions of individuals exposed to Mycobacterium tuberculosis, the immune system is also culpable for tempering the ability of antibiotics to deliver swift and durable cure of disease. In individuals afflicted with tuberculosis, host immunity produces diverse microenvironmental niches that support suboptimal growth, or complete growth arrest, of M. tuberculosis. The physiological state of nonreplication in bacteria is associated with phenotypic drug tolerance. Many of these host microenvironments, when modeled in vitro by carbon starvation, complete nutrient starvation, stationary phase, acidic pH, reactive nitrogen intermediates, hypoxia, biofilms, and withholding streptomycin from the streptomycin-addicted strain SS18b, render M. tuberculosis profoundly tolerant to many of the antibiotics that are given to tuberculosis patients in clinical settings. Targeting nonreplicating persisters is anticipated to reduce the duration of antibiotic treatment and rate of posttreatment relapse. Some promising drugs to treat tuberculosis, such as rifampin and bedaquiline, only kill nonreplicating M. tuberculosisin vitro at concentrations far greater than their minimal inhibitory concentrations against replicating bacilli. There is an urgent demand to identify which of the currently used antibiotics, and which of the molecules in academic and corporate screening collections, have potent bactericidal action on nonreplicating M. tuberculosis. With this goal, we review methods of high-throughput screening to target nonreplicating M. tuberculosis and methods to progress candidate molecules. A classification based on structures and putative targets of molecules that have been reported to kill nonreplicating M. tuberculosis revealed a rich diversity in pharmacophores.
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Affiliation(s)
- Ben Gold
- Department of Microbiology & Immunology, Weill Cornell Medical College, New York, NY, 10065
| | - Carl Nathan
- Department of Microbiology & Immunology, Weill Cornell Medical College, New York, NY, 10065
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46
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Padiadpu J, Baloni P, Anand K, Munshi M, Thakur C, Mohan A, Singh A, Chandra N. Identifying and Tackling Emergent Vulnerability in Drug-Resistant Mycobacteria. ACS Infect Dis 2016; 2:592-607. [PMID: 27759382 DOI: 10.1021/acsinfecdis.6b00004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The global mechanisms and associated molecular alterations that occur in drug-resistant mycobacteria are poorly understood. To address this, we obtain genomics data and then construct a genome-scale response network in isoniazid-resistant Mycobacterium smegmatis and apply a network-mining algorithm. Through this, we decipher global alterations in an unbiased manner and identify emergent vulnerabilities in resistant bacilli, of which redox response was prominent. Using phenotypic profiling, we find that resistant bacilli exhibit collateral sensitivity to several compounds that block antioxidant responses. We find that nanogram/milliliter concentrations of ebselen, vancomycin, and phenylarsine oxide, in combination with isoniazid, are highly effective against Mycobacterium tuberculosis H37Rv and three clinical drug-resistant strains. Dynamic measurements of cytoplasmic redox potential revealed a surprisingly diminished capacity of clinical drug-resistant strains to counteract oxidative stress, providing a mechanistic basis for efficient and synergistic mycobactericidal activity of the drug combinations. Ebselen and vancomycin appear to be promising repurposable drugs.
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Affiliation(s)
- Jyothi Padiadpu
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Priyanka Baloni
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Kushi Anand
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - MohamedHusen Munshi
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Chandrani Thakur
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Abhilash Mohan
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Amit Singh
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
| | - Nagasuma Chandra
- Department of Biochemistry, ‡Supercomputer Education and Research Centre, #Molecular Biophysics Unit, ΔMicrobiology and
Cellular Biology, and ⊥Centre for Infectious Disease Research, Indian Institute of Science, Bangalore 560012, India
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