Identification of chymotrypsin-like protease inhibitors of SARS-CoV-2viaintegrated computational approach

Recently, the world has witnessed outbreak of a novel Coronavirus (SARS-CoV-2), the virus which initially emerged in Wuhan, China has now made its way to a large part of the world, resulting in a public emergency of international concern. The functional importance of Chymotrypsin-like protease (3CL(pro)) in viral replication and maturation turns it into an attractive target for the development of effective antiviral drugs against SARS and other coronaviruses. At present, there is no standard drug regime nor any vaccine available against the infection. The rapid development and identification of efficient interventions against SARS-CoV-2 remains a major challenge. Based on the available knowledge of closely related coronavirus and their safety profiles, repurposing of existing antiviral drugs and screening of available databases is considered a near term strategic and economic way to contain the SARS-CoV-2 pandemic. Herein, we applied computational drug design methods to identify Chymotrypsin-like protease inhibitors from FDA approved antiviral drugs and our in-house database of natural and drug-like compounds of synthetic origin. As a result three FDA approved drugs (Remdesivir, Saquinavir and Darunavir) and two natural compounds (. flavone and coumarine derivatives) were identified as promising hits. Further, MD simulation and binding free energy calculations were performed to evaluate the dynamic behavior, stability of protein-ligand contact, and binding affinity of the hit compounds. Our results indicate that the identified compounds can inhibit the function of Chymotrypsin-like protease (3CL(pro)) of Coronavirus. Considering the severity of the spread of coronavirus, the current study is in-line with the concept of finding the new inhibitors against the vital pathway of the corona virus to expedite the process of drug discovery. Communicated by Ramaswamy H. Sarma

Automated summary

In response to the outbreak of SARS-CoV-2, researchers are investigating the development of antiviral drugs targeting the Chymotrypsin-like protease to combat the infection. Through computational drug design methods, potential inhibitors have been identified from FDA-approved antiviral drugs and natural compounds, with further evaluation of their binding affinity and stability through MD simulation and binding free energy calculations. The results suggest that these compounds have the potential to inhibit the function of Coronavirus' Chymotrypsin-like protease, contributing to the search for new inhibitors against the vital pathway of the virus for drug discovery.