Abstract
Antimicrobial resistance has emerged as a serious issue for physicians and health-care workers treating infections that could lead to the next pandemic. One of the key resistance mechanisms is beta-lactamases. Although several beta-lactamase inhibitors in combination with antibiotics have been created and are being utilized in clinical settings, resistance to these formulations has also been evolving in the bacterial population due to their distinct targets. In this study we used effective combination of antibiotic as an approach to inhibit multidrug resistance bacteria. We used four combinations and checked its efficacy against NDM (New Delhi Metallo-beta-lactamase) variants and functional gain laboratory mutant by employing FICI, enzyme kinetics, fluorescence and computational biology approaches (Docking and Molecular Dynamics Simulation). FICI values of all the combinations were either less than 0.5 or equal to 0.5. Binding features acquired by spectroscopic techniques showed important interaction and complex formation between drugs and enzymes with decreased ksv and kq values. In steady-state kinetics, a reduction in hydrolytic efficiency of enzymes was shown by cooperative binding behaviour when they were treated with different drugs. We have also tested functional gain laboratory mutant developed in our lab, keeping in view that if in future upcoming variants of this kind be emerged then these mutants could also be subsided by combinational therapy. This study identifies three other combinations better than fluoroquinolones effective against NDM variants and laboratory mutant.
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Acknowledgements
We acknowledge the facility and support provided by the Department of Biotechnology, Ministry of science and technology, Government of India.
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We acknowledge funding from the DBT, Government of India, Grant No. BT/PR40148/BTIS/137/20/2021, Tata Innovation Fellowship, BT/HRD/TIF/09/04/2021-22 and NNP DBT GRANT: BT/PR40180/BTIS/137/59/2023. NF is also recipient of senior research fellow from mentioned project.
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NF, performed all experiments and wrote manuscript, SM, performed some of the experiments, AUK, conceived problem and guided the study provided resources and checked first draft of manuscript.
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Farhat, N., Mujahid, S. & Khan, A.U. Mechanistic Approach of Effective Combination of Antibiotics Against Clinical Bacterial Strains Having New Delhi Metallo-Beta-Lactamase Variants and Functional Gain Laboratory Mutant. Curr Microbiol 81, 41 (2024). https://doi.org/10.1007/s00284-023-03553-0
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DOI: https://doi.org/10.1007/s00284-023-03553-0