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?:abstract
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One year after its first outbreak reported in China, coronavirus disease 2019 (COVID-19) pandemic is still sweeping the World causing serious infections and claiming more fatalities. COVID-19 is caused by the novel corona virus SARS-CoV-2, which belongs to the genus Betacoronavirus (ß-CoVs) which is of greatest clinical importance since it contains many other viruses that cause respiratory disease in humans including OC43, HKU1, SARS-CoV and MERS. The spike (S) glycoprotein of ß-CoVs is a key virulence factor determining disease pathogenesis and host tropism, and it also mediates virus binding to host\'s receptors to allow viral entry into host cells, i.e., the first step in virus lifecycle. This, viral entry inhibitors are considered promising putative drugs for COVID-19. Herein, we mined the biomedical literature for viral entry inhibitors of other corona viruses, with special emphasis on ß-CoVs entry inhibitors. We also outlined the structural features of SARS-CoV-2 S protein and how it differs from other ß-CoVs to better understand the structural determinants of S protein binding to its human receptor (ACE2). This review highlighted several promising viral entry inhibitors as potential treatments for COVID-19.
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