Nursing

Gene

Coronavirus

Ecology

Biology

Virology

Proteases

Biochemistry

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)

Drug

Docking (animal)

Coronavirus disease 2019 (COVID-19)

Repurposing

Enzyme

Infectious disease (medical specialty)

Internal medicine

Pharmacology

Drug repositioning

Medicine

In silico

Disease

Microorganisms

The outbreak of coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), results in serious chaos all over the world. In addition to the available vaccines, the development of treatments to cure COVID-19 should be done quickly. One of the fastest strategies is to use a drug-repurposing approach. To provide COVID-19 patients with useful information about medicines currently being used in clinical trials, twenty-four compounds, including antiviral agents, were selected and assayed. These compounds were applied to verify the inhibitory activity for the protein function of 3CLpros (main proteases) of SARS-CoV and SARS-CoV-2. Among them, viral reverse-transcriptase inhibitors abacavir and tenofovir revealed a good inhibitory effect on both 3CLpros. Intriguingly, sildenafil, a cGMP-specific phosphodiesterase type 5 inhibitor also showed significant inhibitory function against them. The in silico docking study suggests that the active-site residues located in the S1 and S2 sites play key roles in the interactions with the inhibitors. The result indicates that 3CLpros are promising targets to cope with SAR-CoV-2 and its variants. The information can be helpful to design treatments to cure patients with COVID-19.

A Study of 3CLpros as Promising Targets against SARS-CoV and SARS-CoV-2