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Current Topics in Medicinal Chemistry

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ISSN (Print): 1568-0266
ISSN (Online): 1873-4294

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Research Article

ATP Synthase Inhibitors as Anti-tubercular Agents: QSAR Studies in Novel Substituted Quinolines

Author(s): Anil K. Saxena* and Muneer Alam

Volume 20, Issue 29, 2020

Page: [2723 - 2734] Pages: 12

DOI: 10.2174/1568026620666200903163515

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Abstract

Background: Tuberculosis (TB) is a major infectious disease caused by Mycobacterium Tuberculosis. As per the World Health Organization (WHO) report of 2019, there were 1.5 million deaths in the year 2018, mainly because of multi- and extensively drug-resistant tuberculosis (MDR & XDR-TB). Among several antitubercular drugs in clinical trials, bedaquiline (TMC207) is a highly promising drug that was approved by the FDA in 2012 and marketed in 2016 for the treatment of multidrug resistant TB in combination with other drugs. Bedaquiline acts on mycobacterial ATP synthase and is highly effective in replicating as well as on dormant mycobacteria. Several series of substituted quinolines have been reported with their antitubercular and ATP synthase inhibitory activity.

Methods: To understand the role of physicochemical parameters like hydrophobicity, electronic and steric factors in eliciting the biological response, the Quantitative structure-activity relationship (QSAR) studies have been carried out using the computed parameters as independent variable and activity (-log IC50/MIC) as the dependent variable.

Results: The developed QSAR models in terms of positively contributing Molar Refractivity (MR) and negatively contributing Partition Coefficient (PC) and Connolly Molecular Area (CMA) parameters have high predictivity as also shown on external data set and the mean value of the computed 3D parameters of enantiomers may be used in QSAR analysis for racemic compounds.

Conclusion: These results are also substantiated by pharmacophore modeling. The similar dependence of antitubercular activity against whole-cell M.Tb.H37Rv on MR and CMA suggests ATP synthase as the main target for antitubercular activity and the QSAR models may be useful in the identification of novel antitubercular agents.

Keywords: ATP Synthase, Bedaquiline, TMC-207, QSAR, Quinolines, Sulfonamides, Bisquinolines, Tuberculosis.

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