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Current Drug Metabolism

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ISSN (Print): 1389-2002
ISSN (Online): 1875-5453

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Research Article

Remdesivir: Mechanism of Metabolic Conversion from Prodrug to Drug

Author(s): Saumya Kapoor, Gurudutt Dubey, Samima Khatun and Prasad V. Bharatam*

Volume 23, Issue 1, 2022

Published on: 21 January, 2022

Page: [73 - 81] Pages: 9

DOI: 10.2174/1389200223666211228160314

Price: $65

Abstract

Background: Remdesivir (GS-5734) has emerged as a promising drug during the challenging times of COVID-19 pandemic. Being a prodrug, it undergoes several metabolic reactions before converting to its active triphosphate metabolite. It is important to establish the atomic level details and explore the energy profile of the prodrug to drug conversion process.

Methods: In this work, Density Functional Theory (DFT) calculations were performed to explore the entire metabolic path. Further, the potential energy surface (PES) diagram for the conversion of prodrug remdesivir to its active metabolite was established. The role of catalytic triad of Hint1 phosphoramidase enzyme in P-N bond hydrolysis was also studied on a model system using combined molecular docking and quantum mechanics approach.

Results: The overall energy of reaction is 11.47 kcal/mol exergonic and the reaction proceeds through many steps requiring high activation energies. In the absence of a catalyst, the P-N bond breaking step requires 41.78 kcal/mol, which is reduced to 14.26 kcal/mol in a catalytic environment.

Conclusion: The metabolic pathways of model system of remdesivir (MSR) were explored completely and potential energy surface diagrams at two levels of theory, B3LYP/6-311++G(d, p) and B3LYP/6-31+G(d), were established and compared. The results highlight the importance of an additional water molecule in the metabolic reaction. The PN bond cleavage step of the metabolic process requires the presence of an enzymatic environment.

Keywords: Remdesivir, GS-5734, metabolism, density functional theory, COVID-19, prodrug.

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