Abstract
Menaquinone is a lipid-soluble naphthoquinone that is essential for various pivotal functions of bacteria. Naphthoquinone is synthesized from chorismate of the shikimate pathway in microorganisms. Due to its absence in humans and animals, menaquinone biosynthesis has been an attractive target for development of antibiotics against a number of important microbial pathogens, such as Mycobacterium tuberculosis (Mtb). In shikimate pathway, O-succinylbenzoate synthase (OSBS) plays a major role and is one of the major potential drug targets. For Mtb-OSBS, a systematic study was conducted to get an insight about Mtb-OSBS enzyme and the corresponding inhibitors using in silico methods. The 3-D model of Mtb-OSBS was built using structure coordinates of Thermobifida fusca. O-succinylbenzoate synthase, the model, was further refined. The active site amino acids have been identified by comparing the template sequence with the Mtb-OSBS sequence. We identified that Lys108, Asn140, Asp138, Lys110, Glu189, Ser236, Asp188, Arg27, Tyr52, and Ser237 are highly conserved, and these may play a vital role as active residues, similar to that in template protein. As per the competitive binding of substrate (2-succinyl-6-hydroxy-2,4-cyclohexadiene-1-carboxylate (SHCHC)), we screened the SHCHC through AutoDock 4.0. The SHCHC molecule was further modified structurally and optimized through PRODRG server. Docking of the 12 lead molecules for best interactions with Mtb-OSBS has given an insight that all the lead molecules have shown interactions with active site amino acids of Mtb-OSBS. MD simulation analysis report has shown the stable conformation annotations of Mtb-OSBS. These hypothetical studies create another way to develop more potential drugs against the deadly mycobacterium.
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Acknowledgments
The Authors Thanks to University of Grant Commission (UGC, New Delhi) (No. 36-216/2008(SR)) India for providing financial assassinate to this work. The Authors also thanks to DBT, New Delhi (BT/BI/25/001/2006). Madhusudana P. thanks the Indian Council of Medicinal Research for providing SRF (no. 45/20/2011-BMS/BIF). Dr. B. Babajan thanks to UGC’s Dr. D.S. Kothari Post-Doctoral program for providing fellowship (No. F.4-2/2006 (BSR)/13-843/2013 (BSR).
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Pulaganti, M., Banaganapalli, B., Mulakayala, C. et al. Molecular Modeling and Docking Studies of O-Succinylbenzoate Synthase of M. tuberculosis—a Potential Target for Antituberculosis Drug Design. Appl Biochem Biotechnol 172, 1407–1432 (2014). https://doi.org/10.1007/s12010-013-0569-4
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DOI: https://doi.org/10.1007/s12010-013-0569-4