article · Future Medicinal Chemistry
Thiophene-based heterocyclic compounds were synthesised and evaluated for antimicrobial properties against methicillin-resistant Staphylococcus aureus, Escherichia coli, Clostridium difficile, and Candida albicans. Testing via the broth microdilution method revealed that a specific compound, spiro-indoline-oxadiazole 17, showed the highest activity against Clostridium difficile without affecting other bacterial strains. In addition, two other synthesised compounds, numbered 8 and 16, produced strong effects against an outer membrane protein TolC mutant strain of Escherichia coli. Computational chemistry studies aligned closely with these experimental observations. Further molecular docking simulations investigated the binding energies of the potent compounds with the bacterial target D-alanine ligase protein. The findings demonstrate that spiro-indoline-oxadiazole 17 shows promise as a selective anticlostridial agent, while related structures demonstrate activity against specific mutant Gram-negative bacteria.
Bacterial infections, including those caused by Clostridium difficile and drug-resistant strains, present serious clinical challenges. Identifying molecules with selective antimicrobial action helps support the development of targeted therapies that eliminate specific pathogens while minimising broader disruptions to the microbiome. Understanding how these chemical structures bind to essential bacterial enzymes provides useful insights for guiding future antimicrobial drug discovery.
This early-stage discovery could interest pharmaceutical companies and medicinal chemistry researchers developing targeted anticlostridial therapeutics or treatments for specific bacterial mutants. The findings provide candidate lead structures, notably compound 17, for further optimisation and investigation. Because testing is limited to laboratory broth microdilution and computational docking, the compounds remain at an early exploratory stage, requiring extensive safety, pharmacokinetic, and in vivo efficacy testing before clinical or commercial translation.
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<b>Aim:</b> Thiophene-based heterocycles were synthesized and evaluated for their antimicrobial activity against methicillin-resistant <i>Staphylococcus aureus, Escherichia coli, Clostridium difficile</i> and <i>Candida albicans</i> strains. <b>Methods:</b> Antimicrobial activity was determined using the broth microdilution method. <b>Results:</b> Spiro-indoline-oxadiazole <b>17</b> displayed the highest activity against <i>C. difficile</i> while having no effects against other bacterial strains. Compounds <b>8</b> and <b>16</b> displayed strong effects against TolC, an outer membrane protein, mutant <i>E. coli</i>. The results of computational chemical study and outcomes of experiments were in good agreement. A molecular docking study was conducted using a molecular operating environment to simulate the binding energies of the potent compounds with D-alanine ligase protein. <b>Conclusion:</b> This study suggests that spiro-indoline-oxadiazole <b>17</b> could be a good anticlostridial agent.
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DOI: 10.4155/fmc-2023-0304
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