Identification of a novel binding mechanism of quinoline based molecules with lactate dehydrogenase of Plasmodium falciparum

Submitting author affiliation:
CSIR-Institute of Himalayan Bioresource Technology, Palampur, India

Beilstein Arch. 2019, 2019153.

Published 06 Dec 2019

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Malaria remains a deadliest disease brought about by Plasmodium species, among one of these species, disease due to Plasmodium falciparum (Pf) is life-threatening. The structures of PfLDH and human LDH are very similar in terms of L-LDH activity, and their biological functions are also equivalent. Therefore, any treatment aiming blocking the functions of PfLDH can affect human LDH. Thus, the main objective of this study is to identify the molecule that exhibits selectivity towards PfLDH without a profound effect on human LDH. In this research, a set of 68 quinolines based molecules were used for molecular docking. From molecular docking, we selected molecules 3j, 4b, 4h, 4m based on their binding affinity, ligand efficiency, lipophilic ligand efficiency, and torsion with selectivity towards PfLDH. The stability of the docked molecules was compared to Chloroquine (reference inhibitor) by applying molecular dynamics simulations and molecular mechanics poisson boltzmann surface area calculations. All the selected molecules showed selectivity for PfLDH with stable dynamic behavior and high binding free energy in comparison to Chloroquine. After examining the molecular mechanics poisson boltzmann surface area ratio results, molecule 3j was reported as a potential and specific inhibitor for PfLDH with a novel mechanism of binding to PfLDH while the remaining molecules 4b, 4h, 4m could further be modified to be used as potent inhibitors against malarial infection.

Keywords: PfLDH; MM-PBSA; molecular docking; MD simulations; LE; LLE.

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Singh, R.; Bhardwaj, V.; Purohit, R. Beilstein Arch. 2019, 2019153. doi:10.3762/bxiv.2019.153.v1

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