Structural insight in understanding the impact of mutation at position 88 and 94 of DNA gyrase A of Mycobacterium tuberculosis in developing resistance against delafloxacin
Abstract
DNA gyrase is a target for treating tuberculosis caused by Mycobacterium tuberculosis. Many cases of antibiotic resistance have been reported due to different point mutations in the Chain A of DNA gyrase. Based on literature information on drug-resistance related study for DNA gyrase, we generated 4 different mutant models 3ILW_G88A, 3ILW_G88C, 3ILW_D94G, and 3ILW_D94H by inserting two mutations at each position 88 and 94 in DNA gyrase chain A. Antibiotics Clinafloxacin, Gatifloxacin, Moxifloxacin, Sitafloxacin, Prulifloxacin, Besifloxacin, Delafloxacin, Ozenoxacin were docked with 3ILW_wild to understand their stability, binding affinity, and interaction pattern with the wild-type DNA gyrase (3ILW_wild). Delafloxacin has shown more stable and favorable binding interaction with the 3ILW_wild (BFE, -8.6 kcal/mol). Docking of Delafloxacin with four mutant models (3ILW_G88A, 3ILW_G88C, 3ILW_D94G, and 3ILW_D94H) was performed to understand the impact of these mutations on binding stability and interaction. A complete loss of binding interaction with Ser118 and Pro119 was observed in mutant complexes as compared to 3ILW_wild, suggesting the role of these residues in developing resistance. Molecular dynamics simulations over 100 ns were carried out for the complex of Delafloxacin with 3ILW_wild and four mutant models. Parameters like RMSD, RMSF, radius of gyration, H-bond, and solvent-accessible surface area revealed that the mutant models are more rigid and less flexible as…
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