Abstract
Coronaviruses are a major infectious disease threat, and include the pathogenic human pathogens of zoonotic origin: SARS-CoV and MERS-CoV. Entry of coronaviruses into host cells is mediated by the viral spike (S) protein, which is structurally categorized as a class I viral fusion protein, within the same group as influenza virus and HIV. However, S proteins have two distinct cleavage sites that can be activated by a much wider range of proteases. The exact location of the coronavirus fusion peptide (FP) has been disputed.
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