Qassim Aljelehawy - Department of Chemistry, College of Education, University of Al-Qadisiyah, Iraq
Osamah Raji Mal Allah - Ministry of Education, General Directorate for Education in Al-Qadisiyah, Iraq
Golsoum Sourazur - Department of Microbiology, Faculty of Microbiology, Islamic Azad University, Ahar Branch, Ahar, Iran

Therapeutic targets of coronavirus disease ۲۰۱۹ (COVID-۱۹) may be spike glycoproteins, main protease (Mpro), and RNA-dependent RNA polymerase (RdRp). The spike glycoprotein or S-glycoprotein of severe acute respiratory syndrome coronavirus ۲ (SARS-CoV-۲) plays critical roles in the adhesion, fusion, and entry of viruses into the host cell. In this way, this receptor can be considered as the main target for neutralization by antiviral agents. Quercetin is a plant secondary metabolite from polyphenols (groups involving flavonoids and tannic acid) significantly extracted from apples, grapes, capers, berries, and onions. This bioactive agent has antimicrobial activity against bacteria, fungi, and viruses. In the current study, we have used ADMETlab ۲.۰ web server to determine the physicochemical properties, medicinal chemistry, toxicity, and absorption of quercetin. In addition, the PatchDock docking server was applied for evaluating the interaction of quercetin with the S-glycoprotein of SARS-CoV-۲. According to the PatchDock results, twelve amino acids including THR۹۵, ASN۹۹, ILE۱۰۱, ARG۱۰۲, GLY۱۰۳, TRP۱۰۴, ASN۱۲۱, ALA۱۲۳, LEU۱۷۶, ASN۱۸۸, ARG۱۹۰, and PHE۱۹۲ had interaction with the active site of the spike glycoprotein. In addition, score, area, and atomic contact energy (ACE) values for the best docking pose were ۴۳۰۴, ۵۱۱.۲۰, and -۲۰۶.۶۰, respectively.

Antiviral agents, Atomic contact energy, Docking score, Flavonol, PatchDock, polyphenols, Receptor-ligand complex