SARS-CoV-2 envelope protein (E protein)

The SARS-CoV-2 envelope protein is one of four major structural proteins in the virus, consisting of 75 amino acids forming a single α-helical transmembrane segment and a short cytoplasmic tail featuring a PDZ-binding motif linked to virulence[3][4][9]. It assembles into a pentameric cation channel (viroporin) in the ER-Golgi intermediate compartment (ERGIC) membrane, facilitating ion (notably Na+ and Ca2+) conduction critical for viral assembly, budding, release, and pathogenicity[1][9]. The protein also mediates interactions with viral and host proteins, including cell junction and immune receptors, promoting viral egress and contributing to virulence[7][9]. Inhibitors targeting the envelope protein’s channel activity (e.g., hexamethylene amiloride) are under active investigation as antiviral agents[1][2][9]. The E protein is highly conserved across SARS-CoV-2 variants, and its C-terminal PBM is recognized as a determinant of disease severity[3][4][7][9].

Other names

Envelope protein (E protein)SARS-CoV-2 ECoronavirus E proteinViroporin E

Ion channel inhibition (viroporin inhibition); Interference with protein-protein interactions relevant for viral assembly and virulence (e.g., blocking E-PALS1 interactions)