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UDP-N-acetylglucosamine enolpyruvyl transferase (MurA) is an important enzyme involved in the first cytosolic step of bacterial cell wall synthesis. In this study a combination of ligand based and structure based  in silico  virtual screening methods were utilised for screening of more than 50,000 drug-like compounds from CSIR-IIIM in-house compound library in order to identify potent inhibitors of MurA. The identified hits were validated in vitro under various incubation conditions using Malachite green phosphate assay, and two potent hits viz 3772-9534 and D396-0012 were identified. Among these hits, compound 3772-9534 showed significant changes in the activity values in different assay conditions. The MD simulation study of 3772-9534 suggested a novel binding site in MurA enzyme, independent of the two-substrate binding sites. Binding of inhibitors at the allosteric site induces conformational changes in the enzyme, which leads to inhibition of enzymatic activity. Overall, the study offers new insight for targeting MurA, which may promote the discovery of novel MurA allosteric site inhibitors.

Identification of novel MurA inhibitors using in silico approach, their validation and elucidation of mode of inhibition