Venezuelan equine encephalitis virus E1 glycoprotein (VEEV E1)

The Venezuelan equine encephalitis virus (VEEV) E1 glycoprotein is a major structural protein that functions as a class II viral fusion protein, essential for the entry of the virus into host cells (UniProt: P03317). It is organized into icosahedral spikes on the viral surface, typically forming heterodimers with the E2 glycoprotein, which is responsible for initial receptor attachment (Voss et al., Nature, 2010, PMID: 21124458). Following endocytosis, the acidic environment of the endosome triggers a conformational rearrangement in E1, leading to the exposure of a hydrophobic fusion loop that inserts into the host membrane (Hunt et al., Journal of Virology, 2010, PMID: 20410443). This process facilitates the fusion of the viral envelope with the endosomal membrane, allowing the viral genome to enter the cytoplasm. Because of its indispensable role in the viral life cycle, E1 is a primary target for neutralizing antibodies and the development of vaccines, such as the live-attenuated TC-83 strain (Hoke et al., Journal of Infectious Diseases, 2012, PMID: 22539661). Therapeutic strategies often focus on blocking the E1-mediated fusion step or preventing the E2/E1 heterodimer from undergoing the necessary structural transitions for infection (Zhang et al., Journal of Virology, 2015, PMID: 25605940). Given VEEV's potential as a biothreat agent and its impact on human and equine health, E1 remains a high-priority target for antiviral intervention.

Other names

E1 envelope proteinVEEV E1 proteinSpike glycoprotein E1E1 envelope glycoprotein

Neutralization of viral infectivity by blocking the pH-dependent conformational change required for membrane fusion between the viral envelope and the host endosomal membrane.