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The interaction of the spike (S) glycoprotein of SARS-CoV-2 with angiotensin-converting enzyme 2 (ACE2) correlates with increased virus transmissibility and disease severity in humans. Two strategies may be considered for preventive or treatment purposes: the blockage of the ACE2 receptors or the shielding of receptor-binding domains (RBD) in the Sprotein of COVID-19, as well as the S2 cleavage site that is used by the furin enzyme of the host cells in the late phase of virus activation. Herein, the interaction of carbon quantum dots (CQDs) with the Sprotein of SARS-CoV-2 was investigated using molecular docking and molecular dynamics. CQD molecules were optimized by the HF/3-21G level of theory; the probable interactions between the CQDs with Sprotein were studied by blind docking mode, considering the Sprotein as the receptor and CQDs as ligands. Ethanol, folic acid, Favipiravir, two kinds of functionalized triangular hexagonal graphene, and four kinds of functionalized CQDs were studied on a comparative basis. The results show that OH and amine-functionalized CQDs tend to interact with three branches of Sprotein, especially RBD. The fact that they can block the S2 cleavage site leads to their potential use as a therapeutic agent.

Deactivation of SARS-CoV-2 via Shielding of Spike Glycoprotein Using Carbon Quantum Dots: Bioinformatic Perspective