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Quinazolinone-Peptido-Nitrophenyl-Derivatives as Potential Inhibitors of SARS-CoV-2 Main Protease. Viruses 2023; 15:v15020287. [PMID: 36851501 PMCID: PMC9963287 DOI: 10.3390/v15020287] [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: 12/30/2022] [Revised: 01/12/2023] [Accepted: 01/18/2023] [Indexed: 01/21/2023] Open
Abstract
The severe acute respiratory syndrome coronavirus 2 main protease (SARS-CoV-2-Mpro) plays an essential role in viral replication, transcription, maturation, and entry into host cells. Furthermore, its cleavage specificity for viruses, but not humans, makes it a promising drug target for the treatment of coronavirus disease 2019 (COVID-19). In this study, a fragment-based strategy including potential antiviral quinazolinone moiety and glutamine- or glutamate-derived peptidomimetic backbone and positioned nitro functional groups was used to synthesize putative Mpro inhibitors. Two compounds, G1 and G4, exhibited anti-Mpro enzymatic activity in a dose-dependent manner, with the calculated IC50 values of 22.47 ± 8.93 μM and 24.04 ± 0.67 μM, respectively. The bio-layer interferometer measured real-time binding. The dissociation kinetics of G1/Mpro and G4/Mpro also showed similar equilibrium dissociation constants (KD) of 2.60 × 10-5 M and 2.55 × 10-5 M, respectively, but exhibited distinct association/dissociation curves. Molecular docking of the two compounds revealed a similar binding cavity to the well-known Mpro inhibitor GC376, supporting a structure-function relationship. These findings may open a new avenue for developing new scaffolds for Mpro inhibition and advance anti-coronavirus drug research.
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2
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Ch'ng ACW, Schepergerdes L, Choong YS, Hust M, Lim TS. Antimicrobial antibodies by phage display: Identification of antibody-based inhibitor against mycobacterium tuberculosis isocitrate lyase. Mol Immunol 2022; 150:47-57. [PMID: 35987135 DOI: 10.1016/j.molimm.2022.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/23/2022] [Accepted: 08/09/2022] [Indexed: 10/15/2022]
Abstract
The increasing incidence reports of antibiotic resistance highlights the need for alternative approaches to deal with bacterial infections. This brought about the idea of utilizing monoclonal antibodies as an alternative antibacterial treatment. Majority of the studies are focused on developing antibodies to bacterial surface antigens, with little emphasis on antibodies that inhibit the growth mechanisms of a bacteria host. Isocitrate lyase (ICL) is an important enzyme for the growth and survival of Mycobacterium tuberculosis (MTB) during latent infection as a result of its involvement in the mycobacterial glyoxylate and methylisocitrate cycles. It is postulated that the inhibition of ICL can disrupt the life cycle of MTB. To this extent, we utilized antibody phage display to identify a single chain fragment variable (scFv) antibody against the recombinant ICL protein from MTB. The soluble a-ICL-C6 scFv clone exhibited good binding characteristics with high specificity against ICL. More importantly, the clone exhibited in vitro inhibitory effect with an enzymatic assay resulting in a decrease of ICL enzymatic activity. In silico analysis showed that the scFv-ICL interactions are driven by 23 hydrogen bonds and 13 salt bridges that might disrupt the formation of ICL subunits for the tertiary structure or the formation of active site β domain. However, further validation is necessary to confirm if the isolated clone is indeed a good inhibitor against ICL for application against MTB.
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Affiliation(s)
- Angela Chiew Wen Ch'ng
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Lena Schepergerdes
- Institut für Biochemie, Biotechnologie und Bioinformatik, Technische Universität Braunschweig, 38106 Braunschweig
| | - Yee Siew Choong
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800 Penang, Malaysia
| | - Michael Hust
- Institut für Biochemie, Biotechnologie und Bioinformatik, Technische Universität Braunschweig, 38106 Braunschweig
| | - Theam Soon Lim
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800 Penang, Malaysia; Analytical Biochemistry Research Centre, Universiti Sains Malaysia, 11800 Penang, Malaysia.
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3
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Kang D, Liu W, Kakahi FB, Delvigne F. Combined utilization of metabolic inhibitors to prevent synergistic multi-species biofilm formation. AMB Express 2022; 12:32. [PMID: 35244796 PMCID: PMC8897544 DOI: 10.1186/s13568-022-01363-4] [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: 12/02/2021] [Accepted: 02/12/2022] [Indexed: 12/04/2022] Open
Abstract
Biofilm is ubiquitous in industrial water systems, causing biofouling and leading to heat transfer efficiency decreases. In particular, multi-species living in biofilms could boost biomass production and enhance treatment resistance. In this study, a total of 37 bacterial strains were isolated from a cooling tower biofilm where acetic acid and propionic acid were detected as the main carbon sources. These isolates mainly belonged to Proteobacteria and Firmicutes, which occupied more than 80% of the total strains according to the 16S rRNA gene amplicon sequencing. Four species (Acinetobacter sp. CTS3, Corynebacterium sp. CTS5, Providencia sp. CTS12, and Pseudomonas sp. CTS17) were observed co-existing in the synthetic medium. Quantitative comparison of biofilm biomass from mono- and multi-species showed a synergistic effect towards biofilm formation among these four species. Three metabolic inhibitors (sulfathiazole, 3-bromopyruvic acid, and 3-nitropropionic acid) were employed to prevent biofilm formation based on their inhibitory effect on corresponding metabolic pathways. All of them displayed evident inhibition profiles to biofilm formation. Notably, combining these three inhibitors possessed a remarkable ability to block the multi-species biofilm development with lower concentrations, suggesting an enhanced effect appeared in simultaneous use. This study demonstrates that combined utilization of metabolic inhibitors is an alternative strategy to prevent multi-species biofilm formation. 37 bacterial strains were isolated and identified from a cooling tower biofilm. Synergistic effect of biofilm formation was observed among four species. Three metabolic inhibitors showed effective inhibition against biofilm formation. Targeting cellular metabolism is an effective way to inhibit biofilm formation.
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Kim JK, Park EJ, Jo EK. Itaconate, Arginine, and Gamma-Aminobutyric Acid: A Host Metabolite Triad Protective Against Mycobacterial Infection. Front Immunol 2022; 13:832015. [PMID: 35185924 PMCID: PMC8855927 DOI: 10.3389/fimmu.2022.832015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 01/13/2022] [Indexed: 12/29/2022] Open
Abstract
Immune metabolic regulation shapes the host-pathogen interaction during infection with Mycobacterium tuberculosis (Mtb), the pathogen of human tuberculosis (TB). Several immunometabolites generated by metabolic remodeling in macrophages are implicated in innate immune protection against Mtb infection by fine-tuning defensive pathways. Itaconate, produced by the mitochondrial enzyme immunoresponsive gene 1 (IRG1), has antimicrobial and anti-inflammatory effects, restricting intracellular mycobacterial growth. L-arginine, a component of the urea cycle, is critical for the synthesis of nitric oxide (NO) and is implicated in M1-mediated antimycobacterial responses in myeloid cells. L-citrulline, a by-product of NO production, contributes to host defense and generates L-arginine in myeloid cells. In arginase 1-expressing cells, L-arginine can be converted into ornithine, a polyamine precursor that enhances autophagy and antimicrobial protection against Mtb in Kupffer cells. Gamma-aminobutyric acid (GABA), a metabolite and neurotransmitter, activate autophagy to induce antimycobacterial host defenses. This review discusses the recent updates of the functions of the three metabolites in host protection against mycobacterial infection. Understanding the mechanisms by which these metabolites promote host defense will facilitate the development of novel host-directed therapeutics against Mtb and drug-resistant bacteria.
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Affiliation(s)
- Jin Kyung Kim
- Department of Microbiology, Chungnam National University College of Medicine, Daejeon, South Korea
- Infection Control Convergence Research Center, Chungnam National University College of Medicine, Daejeon, South Korea
| | - Eun-Jin Park
- Department of Microbiology, Chungnam National University College of Medicine, Daejeon, South Korea
- Infection Control Convergence Research Center, Chungnam National University College of Medicine, Daejeon, South Korea
| | - Eun-Kyeong Jo
- Department of Microbiology, Chungnam National University College of Medicine, Daejeon, South Korea
- Infection Control Convergence Research Center, Chungnam National University College of Medicine, Daejeon, South Korea
- *Correspondence: Eun-Kyeong Jo,
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Anderson AC, Burnett AJN, Constable S, Hiscock L, Maly KE, Weadge JT. A Mechanistic Basis for Phosphoethanolamine Modification of the Cellulose Biofilm Matrix in Escherichia coli. Biochemistry 2021; 60:3659-3669. [PMID: 34762795 DOI: 10.1021/acs.biochem.1c00605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Biofilms are communities of self-enmeshed bacteria in a matrix of exopolysaccharides. The widely distributed human pathogen and commensal Escherichia coli produces a biofilm matrix composed of phosphoethanolamine (pEtN)-modified cellulose and amyloid protein fibers, termed curli. The addition of pEtN to the cellulose exopolysaccharide is accomplished by the action of the pEtN transferase, BcsG, and is essential for the overall integrity of the biofilm. Here, using the synthetic co-substrates p-nitrophenyl phosphoethanolamine and β-d-cellopentaose, we demonstrate using an in vitro pEtN transferase assay that full activity of the pEtN transferase domain of BcsG from E. coli (EcBcsGΔN) requires Zn2+ binding, a catalytic nucleophile/acid-base arrangement (Ser278/Cys243/His396), disulfide bond formation, and other newly uncovered essential residues. We further confirm that EcBcsGΔN catalysis proceeds by a ping-pong bisubstrate-biproduct reaction mechanism and displays inefficient kinetic behavior (kcat/KM = 1.81 × 10-4 ± 2.81 × 10-5 M-1 s-1), which is typical of exopolysaccharide-modifying enzymes in bacteria. Thus, the results presented, especially with respect to donor binding (as reflected by KM), have importantly broadened our understanding of the substrate profile and catalytic mechanism of this class of enzymes, which may aid in the development of inhibitors targeting BcsG or other characterized members of the pEtN transferase family, including the intrinsic and mobile colistin resistance factors.
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Mellott DM, Torres D, Krieger IV, Cameron SA, Moghadamchargari Z, Laganowsky A, Sacchettini JC, Meek TD, Harris LD. Mechanism-Based Inactivation of Mycobacterium tuberculosis Isocitrate Lyase 1 by (2 R,3 S)-2-Hydroxy-3-(nitromethyl)succinic acid. J Am Chem Soc 2021; 143:17666-17676. [PMID: 34664502 DOI: 10.1021/jacs.1c07970] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The isocitrate lyase paralogs of Mycobacterium tuberculosis (ICL1 and 2) are essential for mycobacterial persistence and constitute targets for the development of antituberculosis agents. We report that (2R,3S)-2-hydroxy-3-(nitromethyl)succinic acid (5-NIC) undergoes apparent retro-aldol cleavage as catalyzed by ICL1 to produce glyoxylate and 3-nitropropionic acid (3-NP), the latter of which is a covalent-inactivating agent of ICL1. Kinetic analysis of this reaction identified that 5-NIC serves as a robust and efficient mechanism-based inactivator of ICL1 (kinact/KI = (1.3 ± 0.1) × 103 M-1 s-1) with a partition ratio <1. Using enzyme kinetics, mass spectrometry, and X-ray crystallography, we identified that the reaction of the 5-NIC-derived 3-NP with the Cys191 thiolate of ICL1 results in formation of an ICL1-thiohydroxamate adduct as predicted. One aspect of the design of 5-NIC was to lower its overall charge compared to isocitrate to assist with cell permeability. Accordingly, the absence of the third carboxylate group will simplify the synthesis of pro-drug forms of 5-NIC for characterization in cell-infection models of M. tuberculosis.
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Affiliation(s)
- Drake M Mellott
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Dan Torres
- The Ferrier Research Institute, Victoria University of Wellington, Wellington 5046, New Zealand
| | - Inna V Krieger
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Scott A Cameron
- The Ferrier Research Institute, Victoria University of Wellington, Wellington 5046, New Zealand
- The Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland 1010, New Zealand
| | - Zahra Moghadamchargari
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Arthur Laganowsky
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - James C Sacchettini
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Thomas D Meek
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Lawrence D Harris
- The Ferrier Research Institute, Victoria University of Wellington, Wellington 5046, New Zealand
- The Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland 1010, New Zealand
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7
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Copeland RA, Zhou S, Schaperdoth I, Shoda TKC, Bollinger JM, Krebs C. Hybrid radical-polar pathway for excision of ethylene from 2-oxoglutarate by an iron oxygenase. Science 2021; 373:1489-1493. [PMID: 34385355 DOI: 10.1126/science.abj4290] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Rachelle A Copeland
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA
| | - Shengbin Zhou
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA
| | - Irene Schaperdoth
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA
| | - Tokufu Kent C Shoda
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA
| | - J Martin Bollinger
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA.,Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA
| | - Carsten Krebs
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA.,Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA
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A Novel Glutathione S-Transferase Gtt2 Class (VpGSTT2) Is Found in the Genome of the AHPND/EMS Vibrio parahaemolyticus Shrimp Pathogen. Toxins (Basel) 2021; 13:toxins13090664. [PMID: 34564668 PMCID: PMC8472993 DOI: 10.3390/toxins13090664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 08/24/2021] [Accepted: 08/26/2021] [Indexed: 11/26/2022] Open
Abstract
Glutathione S-transferases are a family of detoxifying enzymes that catalyze the conjugation of reduced glutathione (GSH) with different xenobiotic compounds using either Ser, Tyr, or Cys as a primary catalytic residue. We identified a novel GST in the genome of the shrimp pathogen V. parahaemolyticus FIM- S1708+, a bacterial strain associated with Acute Hepatopancreatic Necrosis Disease (AHPND)/Early Mortality Syndrome (EMS) in cultured shrimp. This new GST class was named Gtt2. It has an atypical catalytic mechanism in which a water molecule instead of Ser, Tyr, or Cys activates the sulfhydryl group of GSH. The biochemical properties of Gtt2 from Vibrio parahaemolyticus (VpGSTT2) were characterized using kinetic and crystallographic methods. Recombinant VpGSTT2 was enzymatically active using GSH and CDNB as substrates, with a specific activity of 5.7 units/mg. Low affinity for substrates was demonstrated using both Michaelis–Menten kinetics and isothermal titration calorimetry. The crystal structure showed a canonical two-domain structure comprising a glutathione binding G-domain and a hydrophobic ligand H domain. A water molecule was hydrogen-bonded to residues Thr9 and Ser 11, as reported for the yeast Gtt2, suggesting a primary role in the reaction. Molecular docking showed that GSH could bind at the G-site in the vicinity of Ser11. G-site mutationsT9A and S11A were analyzed. S11A retained 30% activity, while T9A/S11A showed no detectable activity. VpGSTT2 was the first bacterial Gtt2 characterized, in which residues Ser11 and Thr9 coordinated a water molecule as part of a catalytic mechanism that was characteristic of yeast GTT2. The GTT2 family has been shown to provide protection against metal toxicity; in some cases, excess heavy metals appear in shrimp ponds presenting AHPND/EMS. Further studies may address whether GTT2 in V. parahaemolyticus pathogenic strains may provide a competitive advantage as a novel detoxification mechanism.
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Pham TV, Mellott DM, Moghadamchargari Z, Chen K, Krieger I, Laganowsky A, Sacchettini JC, Meek TD. Covalent Inactivation of Mycobacterium tuberculosis Isocitrate Lyase by cis-2,3-Epoxy-Succinic Acid. ACS Chem Biol 2021; 16:463-470. [PMID: 33688722 DOI: 10.1021/acschembio.0c00740] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The isocitrate lyases (ICL1/2) are essential enzymes of Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis. At present, no ICL1/2 inhibitors have progressed to clinical evaluation, despite extensive drug discovery efforts. Herein, we surveyed succinate analogs against ICL1 and found that dicarboxylic acids constrained in their synperiplanar conformations, such as maleic acid, comprise uncompetitive inhibitors of ICL1 and inhibit more potently than their trans-isomers. From this, we identified cis-2,3 epoxysuccinic acid (cis-EpS) as a selective, irreversible covalent inactivator of Mtb ICL1 (kinact/Kinact= (5.0 ± 1.4) × 104 M-1 s-1; Kinact = 200 ± 50 nM), the most potent inactivator of ICL1 yet characterized. Crystallographic and mass spectrometric analysis demonstrated that Cys191 of ICL1 was S-malylated by cis-EpS, and a crystallographic "snapshot" of inactivation lent insight into the chemical mechanism of this inactivation. Proteomic analysis of E. coli lysates showed that cis-EpS selectively labeled plasmid-expressed Mtb ICL1. Consistently, cis-EpS, but not its trans-isomer, inhibited the growth of Mtb under conditions in which ICL function is essential. These findings encourage the development of analogs of cis-2,3-epoxysuccinate as antituberculosis agents.
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Affiliation(s)
- Truc Viet Pham
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Drake M Mellott
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Zahra Moghadamchargari
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Kevin Chen
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Inna Krieger
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
| | - Arthur Laganowsky
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - James C Sacchettini
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Thomas D Meek
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
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Park JH, Shim D, Kim KES, Lee W, Shin SJ. Understanding Metabolic Regulation Between Host and Pathogens: New Opportunities for the Development of Improved Therapeutic Strategies Against Mycobacterium tuberculosis Infection. Front Cell Infect Microbiol 2021; 11:635335. [PMID: 33796480 PMCID: PMC8007978 DOI: 10.3389/fcimb.2021.635335] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 03/01/2021] [Indexed: 12/21/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) causes chronic granulomatous lung disease in humans. Recently, novel strategies such as host-directed therapeutics and adjunctive therapies that enhance the effect of existing antibiotics have emerged to better control Mtb infection. Recent advances in understanding the metabolic interplay between host immune cells and pathogens have provided new insights into how their interactions ultimately influence disease outcomes and antibiotic-treatment efficacy. In this review, we describe how metabolic cascades in immune environments and relevant metabolites produced from immune cells during Mtb infection play critical roles in the progression of diseases and induction of anti-Mtb protective immunity. In addition, we introduce how metabolic alterations in Mtb itself can lead to the development of persister cells that are resistant to host immunity and can eventually evade antibiotic attacks. Further understanding of the metabolic link between host cells and Mtb may contribute to not only the prevention of Mtb persister development but also the optimization of host anti-Mtb immunity together with enhanced efficacy of existing antibiotics. Overall, this review highlights novel approaches to improve and develop host-mediated therapeutic strategies against Mtb infection by restoring and switching pathogen-favoring metabolic conditions with host-favoring conditions.
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Affiliation(s)
- Ji-Hae Park
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 Project for Graduate School of Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Dahee Shim
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 Project for Graduate School of Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Keu Eun San Kim
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 Project for Graduate School of Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Wonsik Lee
- School of Pharmacy, Sungkyunkwan University, Suwon, South Korea
| | - Sung Jae Shin
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 Project for Graduate School of Medical Science, Yonsei University College of Medicine, Seoul, South Korea
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Kwai BXC, Collins AJ, Middleditch MJ, Sperry J, Bashiri G, Leung IKH. Itaconate is a covalent inhibitor of the Mycobacterium tuberculosis isocitrate lyase. RSC Med Chem 2021; 12:57-61. [PMID: 34046597 PMCID: PMC8130629 DOI: 10.1039/d0md00301h] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 10/07/2020] [Indexed: 12/20/2022] Open
Abstract
Itaconate is a mammalian antimicrobial metabolite that inhibits the isocitrate lyases (ICLs) of Mycobacterium tuberculosis. Herein, we report that ICLs form a covalent adduct with itaconate through their catalytic cysteine residue. These results reveal atomic details of itaconate inhibition and provide insights into the catalytic mechanism of ICLs.
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Affiliation(s)
- Brooke X C Kwai
- School of Chemical Sciences, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
| | - Annabelle J Collins
- School of Chemical Sciences, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
| | - Martin J Middleditch
- School of Biological Sciences, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
- Auckland Science Analytical Services, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
| | - Jonathan Sperry
- School of Chemical Sciences, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
| | - Ghader Bashiri
- School of Biological Sciences, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
| | - Ivanhoe K H Leung
- School of Chemical Sciences, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland Private Bag 92019, Victoria Street West Auckland 1142 New Zealand
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12
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Inverse Solvent Isotope Effects in Enzyme-Catalyzed Reactions. Molecules 2020; 25:molecules25081933. [PMID: 32326332 PMCID: PMC7221790 DOI: 10.3390/molecules25081933] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/14/2020] [Accepted: 04/20/2020] [Indexed: 11/17/2022] Open
Abstract
Solvent isotope effects have long been used as a mechanistic tool for determining enzyme mechanisms. Most commonly, macroscopic rate constants such as kcat and kcat/Km are found to decrease when the reaction is performed in D2O for a variety of reasons including the transfer of protons. Under certain circumstances, these constants are found to increase, in what is termed an inverse solvent kinetic isotope effect (SKIE), which can be a diagnostic mechanistic feature. Generally, these phenomena can be attributed to an inverse solvent equilibrium isotope effect on a rapid equilibrium preceding the rate-limiting step(s). This review surveys inverse SKIEs in enzyme-catalyzed reactions by assessing their underlying origins in common mechanistic themes. Case studies for each category are presented, and the mechanistic implications are put into context. It is hoped that readers may find the illustrative examples valuable in planning and interpreting solvent isotope effect experiments.
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13
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da Silva LS, Barbosa UR, Silva LDC, Soares CMA, Pereira M, da Silva RA. Identification of a new antifungal compound against isocitrate lyase of Paracoccidioides brasiliensis. Future Microbiol 2019; 14:1589-1606. [DOI: 10.2217/fmb-2019-0166] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Aim: To perform virtual screening of compounds based on natural products targeting isocitrate lyase of Paracoccidioides brasiliensis. Materials & methods: Homology modeling and molecular dynamics simulations were applied in order to obtain conformational models for virtual screening. The selected hits were tested in vitro against enzymatic activity of ICL of the dimorphic fungus P. brasiliensis and growth of the Paracoccidioides spp. The cytotoxicity and selectivity index of the compounds were defined. Results & conclusion: Carboxamide, lactone and β-carboline moieties were identified as interesting chemical groups for the design of new antifungal compounds. The compounds inhibited ICL of the dimorphic fungus P. brasiliensis activity. The compound 4559339 presented minimum inhibitory concentration of 7.3 μg/ml in P. brasiliensis with fungicidal effect at this concentration. Thus, a new potential antifungal against P. brasiliensis is proposed.
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Affiliation(s)
- Luciane S da Silva
- LBM – Laboratory of Molecular Biology, Universidade Federal de Goiás, Goiânia, Goiás, 74690-900, Brazil
- Collaborative Nucleus of Biosystems, Universidade Federal de Goiás, Jataí, Goiás, 75804-020, Brazil
| | - Uessiley R Barbosa
- Collaborative Nucleus of Biosystems, Universidade Federal de Goiás, Jataí, Goiás, 75804-020, Brazil
- UNIFIMES, Centro Universitário de Mineiros, Mineiros, Goiás, 75833-130, Brazil
| | - Lívia do C Silva
- LBM – Laboratory of Molecular Biology, Universidade Federal de Goiás, Goiânia, Goiás, 74690-900, Brazil
| | - Célia MA Soares
- LBM – Laboratory of Molecular Biology, Universidade Federal de Goiás, Goiânia, Goiás, 74690-900, Brazil
| | - Maristela Pereira
- LBM – Laboratory of Molecular Biology, Universidade Federal de Goiás, Goiânia, Goiás, 74690-900, Brazil
| | - Roosevelt A da Silva
- Collaborative Nucleus of Biosystems, Universidade Federal de Goiás, Jataí, Goiás, 75804-020, Brazil
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An essential bifunctional enzyme in Mycobacterium tuberculosis for itaconate dissimilation and leucine catabolism. Proc Natl Acad Sci U S A 2019; 116:15907-15913. [PMID: 31320588 PMCID: PMC6689899 DOI: 10.1073/pnas.1906606116] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) is the etiological agent of tuberculosis. One-fourth of the global population is estimated to be infected with Mtb, accounting for ∼1.3 million deaths in 2017. As part of the immune response to Mtb infection, macrophages produce metabolites with the purpose of inhibiting or killing the bacterial cell. Itaconate is an abundant host metabolite thought to be both an antimicrobial agent and a modulator of the host inflammatory response. However, the exact mode of action of itaconate remains unclear. Here, we show that Mtb has an itaconate dissimilation pathway and that the last enzyme in this pathway, Rv2498c, also participates in l-leucine catabolism. Our results from phylogenetic analysis, in vitro enzymatic assays, X-ray crystallography, and in vivo Mtb experiments, identified Mtb Rv2498c as a bifunctional β-hydroxyacyl-CoA lyase and that deletion of the rv2498c gene from the Mtb genome resulted in attenuation in a mouse infection model. Altogether, this report describes an itaconate resistance mechanism in Mtb and an l-leucine catabolic pathway that proceeds via an unprecedented (R)-3-hydroxy-3-methylglutaryl-CoA (HMG-CoA) stereospecific route in nature.
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Tiwari A, Kumar A, Srivastava G, Sharma A. Screening of Anti-mycobacterial Phytochemical Compounds for Potential Inhibitors against Mycobacterium Tuberculosis Isocitrate Lyase. Curr Top Med Chem 2019; 19:600-608. [PMID: 30836915 DOI: 10.2174/1568026619666190304125603] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 10/12/2018] [Accepted: 11/05/2018] [Indexed: 11/22/2022]
Abstract
Background and Introduction: Tuberculosis (TB) is a leading infectious disease caused by Mycobacterium tuberculosiswith high morbidity and mortality. Isocitrate lyase (MtbICL), a key enzyme of glyoxylate pathway has been shown to be involved in mycobacterial persistence, is attractive drug target against persistent tuberculosis. METHODS Virtual screening, molecular docking and MD simulation study has been integrated for screening of phytochemical based anti-mycobacterial compounds. Docking study of reported MtbICL inhibitors has shown an average binding affinity score -7.30 Kcal/mol. In virtual screening, compounds exhibiting lower binding energy than calculated average binding energy were selected as top hit compounds followed by calculation of drug likeness property. Relationship between experimental IC50 value and calculated binding gibbs free energy of reported inhibitors was also calculated through regression analysis to predict IC50 value of potential inhibitors. RESULTS Docking and MD simulation studies of top hit compounds have identified shinjudilactone (quassinoid), lecheronol A (pimarane) and caniojane (diterpene) as potential MtbICL inhibitors. CONCLUSION Phytochemical based anti-mycobacterial compound can further developed into effective drugs against persistence tuberculosis with lesser toxicity and side effects.
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Affiliation(s)
- Ashish Tiwari
- Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plant (CIMAP), Lucknow-226015, Uttar Pradesh, India
| | - Akhil Kumar
- Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plant (CIMAP), Lucknow-226015, Uttar Pradesh, India
| | - Gaurava Srivastava
- Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plant (CIMAP), Lucknow-226015, Uttar Pradesh, India
| | - Ashok Sharma
- Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plant (CIMAP), Lucknow-226015, Uttar Pradesh, India
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Gehringer M, Laufer SA. Emerging and Re-Emerging Warheads for Targeted Covalent Inhibitors: Applications in Medicinal Chemistry and Chemical Biology. J Med Chem 2019; 62:5673-5724. [PMID: 30565923 DOI: 10.1021/acs.jmedchem.8b01153] [Citation(s) in RCA: 397] [Impact Index Per Article: 79.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Targeted covalent inhibitors (TCIs) are designed to bind poorly conserved amino acids by means of reactive groups, the so-called warheads. Currently, targeting noncatalytic cysteine residues with acrylamides and other α,β-unsaturated carbonyl compounds is the predominant strategy in TCI development. The recent ascent of covalent drugs has stimulated considerable efforts to characterize alternative warheads for the covalent-reversible and irreversible engagement of noncatalytic cysteine residues as well as other amino acids. This Perspective article provides an overview of warheads-beyond α,β-unsaturated amides-recently used in the design of targeted covalent ligands. Promising reactive groups that have not yet demonstrated their utility in TCI development are also highlighted. Special emphasis is placed on the discussion of reactivity and of case studies illustrating applications in medicinal chemistry and chemical biology.
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Affiliation(s)
- Matthias Gehringer
- Department of Pharmaceutical/Medicinal Chemistry , Eberhard Karls University Tübingen , Auf der Morgenstelle 8 , 72076 Tübingen , Germany
| | - Stefan A Laufer
- Department of Pharmaceutical/Medicinal Chemistry , Eberhard Karls University Tübingen , Auf der Morgenstelle 8 , 72076 Tübingen , Germany
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Ray S, Kreitler DF, Gulick AM, Murkin AS. The Nitro Group as a Masked Electrophile in Covalent Enzyme Inhibition. ACS Chem Biol 2018; 13:1470-1473. [PMID: 29782144 DOI: 10.1021/acschembio.8b00225] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We report the unprecedented reaction between a nitroalkane and an active-site cysteine residue to yield a thiohydroximate adduct. Structural and kinetic evidence suggests the nitro group is activated by conversion to its nitronic acid tautomer within the active site. The nitro group, therefore, shows promise as a masked electrophile in the design of covalent inhibitors targeting binding pockets with appropriately placed cysteine and general acid residues.
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Affiliation(s)
- Sneha Ray
- Department of Chemistry, University at Buffalo, Buffalo, New York 14260-3000, United States
| | - Dale F. Kreitler
- Hauptman-Woodward Institute and Department of Structural Biology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York 14203-1102, United States
| | - Andrew M. Gulick
- Hauptman-Woodward Institute and Department of Structural Biology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York 14203-1102, United States
| | - Andrew S. Murkin
- Department of Chemistry, University at Buffalo, Buffalo, New York 14260-3000, United States
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18
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Lee YV, Choi SB, Wahab HA, Choong YS. Active Site Flexibility of Mycobacterium tuberculosis Isocitrate Lyase in Dimer Form. J Chem Inf Model 2017; 57:2351-2357. [PMID: 28820943 DOI: 10.1021/acs.jcim.7b00265] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tuberculosis (TB) still remains a global threat due to the emergence of a drug-resistant strain. Instead of focusing on the drug target of active stage TB, we are highlighting the isocitrate lyase (ICL) at the dormant stage TB. ICL is one of the persistent factors for Mycobacterium tuberculosis (MTB) to survive during the dormant phase. In addition, the absence of ICL in human has made ICL a potential drug target for TB therapy. However, the dynamic details of ICL which could give insights to the ICL-ligand interaction have yet to be solved. Therefore, a series of ICL dimer dynamics studies through molecular dynamics simulation were performed in this work. The ICL active site entrance gate closure is contributed to by hydrogen bonding and electrostatic interactions with the C-terminal. Analysis suggested that the open-closed behavior of the ICL active site entrance depends on the type of ligand present in the active site. We also observed four residues (Ser91, Asp108, Asp153, and Cys191) which could possibly be the nucleophiles for nucleophilic attack on the cleavage of isocitrate at the C2-C3 bond. We hope that the elucidation of ICL dynamics can benefit future works such as lead identification or antibody design against ICL for TB therapeutics.
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Affiliation(s)
- Yie-Vern Lee
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia , 11800 Minden, Penang, Malaysia
| | - Sy Bing Choi
- Pharmaceutical Design and Simulation Laboratory, School of Pharmaceutical Sciences, Universiti Sains Malaysia , 11800 Minden, Penang, Malaysia
| | - Habibah A Wahab
- Pharmaceutical Design and Simulation Laboratory, School of Pharmaceutical Sciences, Universiti Sains Malaysia , 11800 Minden, Penang, Malaysia
| | - Yee Siew Choong
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia , 11800 Minden, Penang, Malaysia
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Mechanism-based inactivator of isocitrate lyases 1 and 2 from Mycobacterium tuberculosis. Proc Natl Acad Sci U S A 2017; 114:7617-7622. [PMID: 28679637 DOI: 10.1073/pnas.1706134114] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Isocitrate lyase (ICL, types 1 and 2) is the first enzyme of the glyoxylate shunt, an essential pathway for Mycobacterium tuberculosis (Mtb) during the persistent phase of human TB infection. Here, we report 2-vinyl-d-isocitrate (2-VIC) as a mechanism-based inactivator of Mtb ICL1 and ICL2. The enzyme-catalyzed retro-aldol cleavage of 2-VIC unmasks a Michael substrate, 2-vinylglyoxylate, which then forms a slowly reversible, covalent adduct with the thiolate form of active-site Cys191 2-VIC displayed kinetic properties consistent with covalent, mechanism-based inactivation of ICL1 and ICL2 with high efficiency (partition ratio, <1). Analysis of a complex of ICL1:2-VIC by electrospray ionization mass spectrometry and X-ray crystallography confirmed the formation of the predicted covalent S-homopyruvoyl adduct of the active-site Cys191.
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Bhusal RP, Bashiri G, Kwai BXC, Sperry J, Leung IKH. Targeting isocitrate lyase for the treatment of latent tuberculosis. Drug Discov Today 2017; 22:1008-1016. [PMID: 28458043 DOI: 10.1016/j.drudis.2017.04.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 03/04/2017] [Accepted: 04/20/2017] [Indexed: 01/11/2023]
Abstract
Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis that can remain dormant for many years before becoming active. One way to control and eliminate TB is the identification and treatment of latent TB, preventing infected individuals from developing active TB and thus eliminating the subsequent spread of the disease. Isocitrate lyase (ICL) is involved in the mycobacterial glyoxylate and methylisocitrate cycles. ICL is important for the growth and survival of M. tuberculosis during latent infection. ICL is not present in humans and is therefore a potential therapeutic target for the development of anti-TB agents. Here, we explore the evidence linking ICL to persistent survival of M. tuberculosis. The structure, mechanism and inhibition of the enzyme is also discussed.
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Affiliation(s)
- Ram Prasad Bhusal
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Victoria Street West, Auckland 1142, New Zealand
| | - Ghader Bashiri
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Victoria Street West, Auckland 1142, New Zealand
| | - Brooke X C Kwai
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Victoria Street West, Auckland 1142, New Zealand
| | - Jonathan Sperry
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Victoria Street West, Auckland 1142, New Zealand.
| | - Ivanhoe K H Leung
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Victoria Street West, Auckland 1142, New Zealand.
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Park Y, Cho Y, Lee YH, Lee YW, Rhee S. Crystal structure and functional analysis of isocitrate lyases from Magnaporthe oryzae and Fusarium graminearum. J Struct Biol 2016; 194:395-403. [DOI: 10.1016/j.jsb.2016.03.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 03/16/2016] [Accepted: 03/22/2016] [Indexed: 11/24/2022]
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