Abstract

Main protease (Mpro) and Spike (S) proteins are said potential drug targets of COVID-19. Pneumonia like respiratory illness caused by SARS-CoV-2 is spreading rapidly due to its replication and transmission rate. Protease is the protein that is involved in both replication and transcription. Since CoV-2 shares, genomic similarity with CoV and MERS-CoV, drugs from previous outbreaks are used as primary treatment of the disease. In-silico drug development strategies are said to be faster and effective than in-vitro with a lesser amount of risk factors. Fragment Based Drug Designing (FBDD), also known as rational drug design in which a potential target protein is selected and docked with a lead-like molecule that eventually leads to drug development. Nine (9) drugs that are currently being used to treat patients of coronavirus were selected in this study from the latest literature review and fragmented as per rules followed by crosslinking of drug fragments using editor tools. These native drugs and synthesized drugs were then docked against the main protease. Results of the study revealed that one of the crosslinked lead-like compounds showed a higher binding affinity (∆G) more than any of the native compounds. Further, the results of this study suggested that the combination of potential drugs can be an effective way to develop new drugs to treat a deadly disease.

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