Severe acute respiratory syndrome coronavirus 2 envelope protein (SARS-CoV-2 E protein) (SARS-CoV-2 E protein)

The Severe acute respiratory syndrome coronavirus 2 envelope protein (SARS-CoV-2 E protein) is a small, 75-amino acid hydrophobic protein that is essential for the viral life cycle (UniProt P0DTC4). It functions primarily as a viroporin, forming pentameric ion channels in the host's endoplasmic reticulum-Golgi intermediate compartment (ERGIC) membrane, which facilitates viral assembly and budding (PubMed: 32544427). The E protein is also a significant virulence factor; its ion channel activity and interactions with host proteins like PALS1 contribute to the disruption of epithelial barriers and the activation of the NLRP3 inflammasome, leading to severe inflammation (PubMed: 34125054). As a therapeutic target, its ion channel function can be inhibited by small molecules such as amantadine and hexamethylene amiloride (HMA), which may reduce viral titers and mitigate the inflammatory response (PubMed: 33053466). Despite its small size, the E protein's conservation across variants makes it an attractive candidate for broad-spectrum antiviral development.

Other names

E proteinEnvelope small membrane proteinsars-cov-2-eViroporin E2019-nCoV envelope protein

Inhibition of the pentameric viroporin ion channel activity, which disrupts the electrochemical gradient of the ERGIC, thereby preventing viral assembly, budding, and the activation of host inflammatory pathways.