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Article Abstract
In this study, the crystal structure of the Mycobacterium tuberculosis (MTB) enzyme chorismate mutase (CM) bound to transition state analogue (PDB: 2FP2) was used as a framework for virtual screening of the BITS-Pilani in-house database (2500 compounds) to identify new scaffold. We identified isatin as novel small molecule MTB CM inhibitors; further twenty-four isatin derivatives were synthesized and evaluated in vitro for their ability to inhibit MTB CM, and activity against M. tuberculosis as steps towards the derivation of structure-activity relationships (SAR) and lead optimization. Compound 3-(4-nitrobenzylidene)indolin-2-one, 24 emerged as the most promising lead with an IC50 of 1.01 ± 0.22 μm for purified CM and MIC of 23.5 μm for M. tuberculosis, with little or no cytotoxicity.
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