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Guzman JD, Wube A, Evangelopoulos D, Gupta A, Hüfner A, Basavannacharya C, Rahman MM, Thomaschitz C, Bauer R, McHugh TD, Nobeli I, Prieto JM, Gibbons S, Bucar F, Bhakta S. Interaction of N-methyl-2-alkenyl-4-quinolones with ATP-dependent MurE ligase of Mycobacterium tuberculosis: antibacterial activity, molecular docking and inhibition kinetics. J Antimicrob Chemother 2011; 66:1766-72. [PMID: 21622974 PMCID: PMC3133487 DOI: 10.1093/jac/dkr203] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 04/18/2011] [Accepted: 04/27/2011] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES The aim of this study was to comprehensively evaluate the antibacterial activity and MurE inhibition of a set of N-methyl-2-alkenyl-4-quinolones found to inhibit the growth of fast-growing mycobacteria. METHODS Using the spot culture growth inhibition assay, MICs were determined for Mycobacterium tuberculosis H(37)Rv, Mycobacterium bovis BCG and Mycobacterium smegmatis mc(2)155. MICs were determined for Mycobacterium fortuitum, Mycobacterium phlei, methicillin-resistant Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa using microplate dilution assays. Inhibition of M. tuberculosis MurE ligase activity was determined both by colorimetric and HPLC methods. Computational modelling and binding prediction of the quinolones in the MurE structure was performed using Glide. Kinetic experiments were conducted for understanding possible competitive relations of the quinolones with the endogenous substrates of MurE ligase. RESULTS The novel synthetic N-methyl-2-alkenyl-4-quinolones were found to be growth inhibitors of M. tuberculosis and rapid-growing mycobacteria as well as methicillin-resistant S. aureus, while showing no inhibition for E. coli and P. aeruginosa. The quinolones were found to be inhibitory to MurE ligase of M. tuberculosis in the micromolar range (IC(50) ∼40-200 μM) when assayed either spectroscopically or by HPLC. Computational docking of the quinolones on the published M. tuberculosis MurE crystal structure suggested that the uracil recognition site is a probable binding site for the quinolones. CONCLUSIONS N-methyl-2-alkenyl-4-quinolones are inhibitors of mycobacterial and staphylococcal growth, and show MurE ligase inhibition. Therefore, they are considered as a starting point for the development of increased affinity MurE activity disruptors.
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Affiliation(s)
- Juan David Guzman
- Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
- Department of Pharmaceutical and Biological Chemistry, The School of Pharmacy, University of London, 29–39 Brunswick Square, London WC1N 1AX, UK
| | - Abraham Wube
- Department of Pharmacognosy, Institute of Pharmaceutical Sciences, Karl Franzens University Graz, Universitätsplatz 4, A-8010 Graz, Austria
| | - Dimitrios Evangelopoulos
- Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
- Department of Medical Microbiology, Royal Free Hospital, University College London, Rowland Hill Street, London NW3 2PF, UK
| | - Antima Gupta
- Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
| | - Antje Hüfner
- Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, Karl Franzens University Graz, Universitätsplatz 1, A-8010 Graz, Austria
| | - Chandrakala Basavannacharya
- Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
| | - Md. Mukhleshur Rahman
- Department of Pharmaceutical and Biological Chemistry, The School of Pharmacy, University of London, 29–39 Brunswick Square, London WC1N 1AX, UK
| | - Christina Thomaschitz
- Department of Pharmacognosy, Institute of Pharmaceutical Sciences, Karl Franzens University Graz, Universitätsplatz 4, A-8010 Graz, Austria
| | - Rudolf Bauer
- Department of Pharmacognosy, Institute of Pharmaceutical Sciences, Karl Franzens University Graz, Universitätsplatz 4, A-8010 Graz, Austria
| | - Timothy Daniel McHugh
- Department of Medical Microbiology, Royal Free Hospital, University College London, Rowland Hill Street, London NW3 2PF, UK
| | - Irene Nobeli
- Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
| | - Jose M. Prieto
- Department of Pharmaceutical and Biological Chemistry, The School of Pharmacy, University of London, 29–39 Brunswick Square, London WC1N 1AX, UK
| | - Simon Gibbons
- Department of Pharmaceutical and Biological Chemistry, The School of Pharmacy, University of London, 29–39 Brunswick Square, London WC1N 1AX, UK
| | - Franz Bucar
- Department of Pharmacognosy, Institute of Pharmaceutical Sciences, Karl Franzens University Graz, Universitätsplatz 4, A-8010 Graz, Austria
| | - Sanjib Bhakta
- Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
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Wube AA, Hüfner A, Thomaschitz C, Blunder M, Kollroser M, Bauer R, Bucar F. Design, synthesis and antimycobacterial activities of 1-methyl-2-alkenyl-4(1H)-quinolones. Bioorg Med Chem 2011; 19:567-79. [PMID: 21106378 PMCID: PMC3268452 DOI: 10.1016/j.bmc.2010.10.060] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 09/30/2010] [Accepted: 10/29/2010] [Indexed: 12/02/2022]
Abstract
A series of 23 new 1-methyl-2-alkenyl-4(1H)quinolones have been synthesized and evaluated in vitro for their antimycobacterial activities against fast growing species of mycobacteria, such as Mycobacterium fortuitum, M. smegmatis and M. phlei. The compounds displayed good to excellent inhibition of the growth of the mycobacterial test strains with improved antimycobacterial activity compared to the hit compound, evocarpine. The most active compounds, which possessed chain length of 11-13 carbons at position-2 displayed potent inhibitory effects with an MIC value of 1.0mg/L. In a human diploid embryonic lung cell line, MRC-5 cytotoxicity assay, the alkaloids showed weak to moderate cytotoxic activity. Biological evaluation of these evocarpine analogues on the less pathogenic fast growing strains of mycobacteria showed an interesting antimycobacterial profile and provided significant insight into the structure-activity relationships.
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Affiliation(s)
- Abraham A. Wube
- Institute of Pharmaceutical Sciences, Department of Pharmacognosy,
University of Graz, Universitätsplatz 4/1, 8010 Graz, Austria
| | - Antje Hüfner
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical
Chemistry, University of Graz, Universitätsplatz 1, 8010 Graz,
Austria
| | - Christina Thomaschitz
- Institute of Pharmaceutical Sciences, Department of Pharmacognosy,
University of Graz, Universitätsplatz 4/1, 8010 Graz, Austria
| | - Martina Blunder
- Institute of Pharmaceutical Sciences, Department of Pharmacognosy,
University of Graz, Universitätsplatz 4/1, 8010 Graz, Austria
| | - Manfred Kollroser
- Institute of Forensic Medicine, Medical University of Graz,
Universitätsplatz 4/2, 8010 Graz, Austria
| | - Rudolf Bauer
- Institute of Pharmaceutical Sciences, Department of Pharmacognosy,
University of Graz, Universitätsplatz 4/1, 8010 Graz, Austria
| | - Franz Bucar
- Institute of Pharmaceutical Sciences, Department of Pharmacognosy,
University of Graz, Universitätsplatz 4/1, 8010 Graz, Austria
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