Inhibitory Effects and Surface Plasmon Resonance-Based Binding Affinities of Dietary Hydrolyzable Tannins and Their Gut Microbial Metabolites on SARS-CoV-2 Main Protease.

Abstract

Severe acute respiratory syndrome coronavirus (SARS-CoV-2) main protease (Mpro) inhibitors are considered as potential treatments for coronavirus disease 2019, and dietary polyphenols show promise in SARS-CoV-2 Mpro inhibition based on in silico studies. In the present study, we utilize a combination of biochemical-, surface plasmon resonance-, and docking-based assays to evaluate the inhibition and binding affinities of a series of tannins and their gut microbial metabolites on SARS-CoV-2 Mpro. The tested compounds (2-50 μM) were hydrolyzable tannins, including ellagitannins (punicalagin and ellagic acid) and gallotannins (tannic acid, pentagalloyl glucose, ginnalin A, and gallic acid), and their gut microbial metabolites, urolithins and pyrogallol, respectively. They inhibited SARS-CoV-2 Mpro (by 6.6-100.0% at 50 μM) and bound directly to the Mpro protein (with dissociation constants from 1.1 × 10-6 to 5.3 × 10-5 M). This study sheds light on the inhibitory effects of tannins and their metabolites on SARS-CoV-2 Mpro.

• Authors: Huifang Li, Feng Xu, Chang Liu, Ang Cai, Joel A Dain, Dongli Li, Navindra P Seeram, Bongsup P Cho, Hang Ma
• Journal: Journal of agricultural and food chemistry (J Agric Food Chem) Vol. 69 Issue 41 Pg. 12197-12208 (Oct 20 2021) ISSN: 1520-5118 [Electronic] United States
• PMID: 34586788 (Publication Type: Journal Article)

Chemical References

• Hydrolyzable Tannins
• Protease Inhibitors
• Peptide Hydrolases

Topics

• COVID-19
• Gastrointestinal Microbiome
• Humans
• Hydrolyzable Tannins
• Molecular Docking Simulation
• Peptide Hydrolases
• Protease Inhibitors
• SARS-CoV-2
• Surface Plasmon Resonance