Abstract
Two series of novel and highly functionalised dispiropyrrolidines were synthesized using 1,3-dipolar cycloaddition reaction. The synthesized compounds were screened for their antimycobacterial activity against M. tuberculosis H37Rv using the Promega reagent BacTiter-Glo™ Microbial Cell Viability (BTG). Molecular docking analysis was carried out for the active compounds against the target enzyme enoyl-ACP reductase (InhA) to understand the possible binding mode. Of the 24 novel synthesized compounds, seven dispiropyrrolidines revealed inhibition with EC50 <25 µM. Compound 5b 7′-(4-chlorophenyl)-5′,6′,7′,7a′-tetrahydrodispiro[indan-2,5′-pyrrolo[1,2-c]-[1,3]thiazole-6′,2″-indan]-1,3,1″-trione was found to be the most active with EC50 of 10.52 µM, and was 2.2-fold more active than cycloserine. The docking result revealed that 5b had good affinity with the catalytic residues in InhA, forming hydrophobic and mild polar interactions with the important amino acids in the active site.
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Acknowledgments
The authors wish to express their thanks to Pharmacogenetic and Novel Therapeutic Research, Institute for Research in Molecular Medicine, Universiti of Sains Malaysia, Penang for the research facilities. This work was supported by National Institutes of Health and the National Institute of Allergy and Infectious Diseases, Contract No. HHSN272201100012I for the biological evaluation. The funding of this project was through Research Grant No. RUC (1001/PSK/8620012) and RU 1001/PKIMIA/811221.
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Wei, A.C., Ali, M.A., Yoon, Y.K. et al. Antimycobacterial activity and in silico study of highly functionalised dispiropyrrolidines. Med Chem Res 24, 818–828 (2015). https://doi.org/10.1007/s00044-014-1181-z
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DOI: https://doi.org/10.1007/s00044-014-1181-z