Ligand-Based Virtual Screening for Discovery of Indole Derivatives as Potent DNA Gyrase ATPase Inhibitors Active against Mycobacterium tuberculosis and Hit Validation by Biological Assays.
Bongkochawan PakamwongPaptawan ThongdeeBundit KamsriNareudon PhusiSomjintana TaveepanichKampanart ChayajarusPharit KamsriAuradee PunkvangSupa HannongbuaJidapa SangswanKhomson SuttisintongSanya SureramPrasat KittakoopPoonpilas HongmaneePitak SantanirandJiraporn LeanpolchareanchaiJames SpencerAdrian J MulhollandPornpan PungpoPublished in: Journal of chemical information and modeling (2024)
Mycobacterium tuberculosis is the single most important global infectious disease killer and a World Health Organization critical priority pathogen for development of new antimicrobials. M. tuberculosis DNA gyrase is a validated target for anti-TB agents, but those in current use target DNA breakage-reunion, rather than the ATPase activity of the GyrB subunit. Here, virtual screening, subsequently validated by whole-cell and enzyme inhibition assays, was applied to identify candidate compounds that inhibit M. tuberculosis GyrB ATPase activity from the Specs compound library. This approach yielded six compounds: four carbazole derivatives ( 1 , 2 , 3 , and 8 ), the benzoindole derivative 11 , and the indole derivative 14 . Carbazole derivatives can be considered a new scaffold for M. tuberculosis DNA gyrase ATPase inhibitors. IC 50 values of compounds 8 , 11 , and 14 (0.26, 0.56, and 0.08 μM, respectively) for inhibition of M. tuberculosis DNA gyrase ATPase activity are 5-fold, 2-fold, and 16-fold better than the known DNA gyrase ATPase inhibitor novobiocin. MIC values of these compounds against growth of M. tuberculosis H37Ra are 25.0, 3.1, and 6.2 μg/mL, respectively, superior to novobiocin (MIC > 100.0 μg/mL). Molecular dynamics simulations of models of docked GyrB:inhibitor complexes suggest that hydrogen bond interactions with GyrB Asp79 are crucial for high-affinity binding of compounds 8 , 11 , and 14 to M. tuberculosis GyrB for inhibition of ATPase activity. These data demonstrate that virtual screening can identify known and new scaffolds that inhibit both M. tuberculosis DNA gyrase ATPase activity in vitro and growth of M. tuberculosis bacteria.
Keyphrases
- mycobacterium tuberculosis
- circulating tumor
- pulmonary tuberculosis
- cell free
- single molecule
- molecular dynamics simulations
- hiv aids
- endoplasmic reticulum
- emergency department
- rheumatoid arthritis
- stem cells
- adverse drug
- machine learning
- single cell
- cell therapy
- systemic sclerosis
- drug induced
- human immunodeficiency virus