Rosmarinic Acid as a Potent Influenza Neuraminidase Inhibitor: In Vitro and In Silico Study

Author(s): Panupong Mahalapbutr, Mattanun Sangkhawasi, Jirayu Kammarabutr, Supakarn Chamni*, Thanyada Rungrotmongkol*

Journal Name: Current Topics in Medicinal Chemistry

Volume 20 , Issue 23 , 2020


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Abstract:

Background: Neuraminidase (NA), a major glycoprotein found on the surface of the influenza virus, is an important target for the prophylaxis and treatment of influenza virus infections. Recently, several plant-derived polyphenols, especially caffeic acid analogs, have been reported to exert the inhibitory activity against NA.

Objective: Herein, we aimed to investigate the anti-influenza NA activity of caffeic acid and its hydroxycinnamate analogues, rosmarinic acid and salvianolic acid A, in comparison to a known NA inhibitor, oseltamivir.

Methods: In vitro MUNANA-based NA inhibitory assay was used to evaluate the inhibitory activity of the three interested hydroxycinnamic compounds towards the influenza NA enzyme. Subsequently, allatom molecular dynamics (MD) simulations and binding free energy calculations were employed to elucidate the structural insights into the protein-ligand complexations.

Results: Rosmarinic acid showed the highest inhibitory activity against NA with the IC50 of 0.40 μM compared to caffeic acid (IC50 of 0.81 μM) and salvianolic acid A (IC50 of >1 μM). From 100-ns MD simulations, the binding affinity, hot-spot residues, and H-bond formations of rosmarinic acid/NA complex were higher than those of caffeic acid/NA model, in which their molecular complexations was driven mainly by electrostatic attractions and H-bond formations from several charged residues (R118, E119, D151, R152, E227, E277, and R371). Notably, the two hydroxyl groups on both phenyl and phenylacetic rings of rosmarinic acid play a crucial role in stabilizing NA through a strongly formed Hbond( s).

Conclusion: Our findings shed light on the potentiality of rosmarinic acid as a lead compound for further development of a potential influenza NA inhibitor.

Keywords: Neuraminidase, Caffeic acid, Rosmarinic acid, Hydroxycinnamate analogues, Molecular docking, Molecular dynamics simulations.

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VOLUME: 20
ISSUE: 23
Year: 2020
Published on: 11 October, 2020
Page: [2046 - 2055]
Pages: 10
DOI: 10.2174/1568026619666191118110155
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