Efficacy of epetraborole against Mycobacterium abscessus is increased with norvaline
| Autor: | Marcel A. Behr, Jaryd R. Sullivan, Claire Hamela, Laurent Kremer, T. Martin Schmeing, Lorne Taylor, Kim A. Munro, Elias Kalthoff, Andréanne Lupien |
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| Přispěvatelé: | McGill University = Université McGill [Montréal, Canada], McGill International Tuberculosis Centre (TB), McGill University Health Center [Montreal] (MUHC), Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Kremer, Laurent |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Antibiotics
Antitubercular Agents Mice SCID Mycobacterium abscessus Cystic fibrosis Biochemistry Chaperonin chemistry.chemical_compound Mice Mice Inbred NOD Clarithromycin Medicine and Health Sciences Amino Acids Biology (General) Pathogen Zebrafish chemistry.chemical_classification 0303 health sciences biology Organic Compounds Antimicrobials Drugs Eukaryota Valine Animal Models Amino acid 3. Good health Actinobacteria Chemistry [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Experimental Organism Systems Osteichthyes Physical Sciences Vertebrates Drug Therapy Combination Leucine medicine.drug Research Article Tuberculosis medicine.drug_class QH301-705.5 Immunology Mycobacterium Infections Nontuberculous Aminoacylation Mouse Models Research and Analysis Methods Microbiology Mycobacterium tuberculosis 03 medical and health sciences Model Organisms Virology Microbial Control Genetics medicine Animals Animal Models of Disease Molecular Biology [SDV.MP] Life Sciences [q-bio]/Microbiology and Parasitology 030304 developmental biology Pharmacology Drug Screening Bacteria 030306 microbiology Organic Chemistry Organisms Chemical Compounds Biology and Life Sciences Proteins RC581-607 medicine.disease biology.organism_classification bacterial infections and mycoses GroEL Animal Models of Infection Fish chemistry Aliphatic Amino Acids Animal Studies bacteria Parasitology Norvaline Immunologic diseases. Allergy Zoology Mycobacterium Tuberculosis |
| Zdroj: | PLoS Pathogens PLoS Pathogens, Public Library of Science, 2021, 17 (10), pp.e1009965. ⟨10.1371/journal.ppat.1009965⟩ PLoS Pathogens, Vol 17, Iss 10, p e1009965 (2021) PLoS Pathogens, 2021, 17 (10), pp.e1009965. ⟨10.1371/journal.ppat.1009965⟩ |
| ISSN: | 1553-7366 1553-7374 |
| Popis: | Mycobacterium abscessus is the most common rapidly growing non-tuberculous mycobacteria to cause pulmonary disease in patients with impaired lung function such as cystic fibrosis. M. abscessus displays high intrinsic resistance to common antibiotics and inducible resistance to macrolides like clarithromycin. As such, M. abscessus is clinically resistant to the entire regimen of front-line M. tuberculosis drugs, and treatment with antibiotics that do inhibit M. abscessus in the lab results in cure rates of 50% or less. Here, we identified epetraborole (EPT) from the MMV pandemic response box as an inhibitor against the essential protein leucyl-tRNA synthetase (LeuRS) in M. abscessus. EPT protected zebrafish from lethal M. abscessus infection and did not induce self-resistance nor against clarithromycin. Contrary to most antimycobacterials, the whole-cell activity of EPT was greater against M. abscessus than M. tuberculosis, but crystallographic and equilibrium binding data showed that EPT binds LeuRSMabs and LeuRSMtb with similar residues and dissociation constants. Since EPT-resistant M. abscessus mutants lost LeuRS editing activity, these mutants became susceptible to misaminoacylation with leucine mimics like the non-proteinogenic amino acid norvaline. Proteomic analysis revealed that when M. abscessus LeuRS mutants were fed norvaline, leucine residues in proteins were replaced by norvaline, inducing the unfolded protein response with temporal changes in expression of GroEL chaperonins and Clp proteases. This supports our in vitro data that supplementation of media with norvaline reduced the emergence of EPT mutants in both M. abscessus and M. tuberculosis. Furthermore, the combination of EPT and norvaline had improved in vivo efficacy compared to EPT in a murine model of M. abscessus infection. Our results emphasize the effectiveness of EPT against the clinically relevant cystic fibrosis pathogen M. abscessus, and these findings also suggest norvaline adjunct therapy with EPT could be beneficial for M. abscessus and other mycobacterial infections like tuberculosis. Author summary Current antimycobacterial drugs are inadequate to handle the increasing number of non-tuberculous mycobacteria infections that eclipse tuberculosis infections in many developed countries. Of particular importance for cystic fibrosis patients, Mycobacterium abscessus is notoriously difficult to treat where patients spend extended time on antibiotics with cure rates comparable to extreme drug resistant M. tuberculosis. Here, we identified epetraborole (EPT) with in vitro and in vivo activities against M. abscessus. We showed that EPT targets the editing domain of the leucyl-tRNA synthetase (LeuRS) and that escape mutants lost LeuRS editing activity, making these mutants susceptible to misaminoacylation with leucine mimics. Most importantly, combination therapy of EPT and norvaline limited the rate of EPT resistance in both M. abscessus and M. tuberculosis, and this was the first study to demonstrate improved in vivo efficacy of EPT and norvaline compared to EPT in a murine model of M. abscessus pulmonary infection. The demonstration of norvaline adjunct therapy with EPT for M. abscessus infections is promising for cystic fibrosis patients and could translate to other mycobacterial infections, such as tuberculosis. |
| Databáze: | OpenAIRE |
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