CHIKV E1

CHIKV E1 Full Name

Chikungunya virus E1 protein

CHIKV E1 Introduction

The envelope protein E1 of Chikungunya virus (CHIKV) is essential for the virus's entry process into host cells, primarily responsible for mediating membrane fusion. This protein works in association with E2, forming a heterodimer that is crucial for the virus's infectivity and its ability to undergo conformational changes required for fusion. The glycoprotein E1 is vital during the assembly phase of the virus and is involved in the budding process of mature virions. Structural studies indicate that E1 is relatively hydrophobic and more embedded within the virus structure compared to E2, which may allow E1 to evade host immune detection while also implicating it in critical steps of viral release and entry. E1 is predicted to be N-glycosylated at specific residues, which affects its stability and immunogenicity. Notably, while E1 plays a key role in facilitating membrane fusion, it exhibits lower immunogenicity compared to E2 in human responses, as evidenced by its reduced ability to elicit robust neutralizing antibody responses in infected individuals. In contrast, E2 is recognized as the primary target for neutralizing antibodies produced during acute infection. This differential immunogenic response complicates the development of serological diagnostics and vaccines.

Figure 1. Chikungunya virus (CHIKV) Envelope Protein E1.

Experimental vaccines that incorporate E1, alongside E2, have shown promising results in eliciting immune responses against CHIKV. Virus-like particle (VLP) formulations containing both E1 and E2 proteins have been demonstrated to effectively stimulate neutralizing antibody responses in immunocompetent hosts. The dual involvement of E1 in virus entry and its contribution to vaccine efficacy underscores the importance of both envelope proteins in CHIKV pathogenesis and control strategies. Recent studies have further elucidated the structural dynamics and functional determinants of E1 during pH-induced conformational changes. At acidic pH, E1 undergoes a transformative process that exposes its fusion loop, facilitating the merging of viral and cellular membranes. Understanding these conformational shifts is crucial for the design of antiviral therapies.

In conclusion, while E1 and E2 of CHIKV serve distinct but synergistic functions during the viral lifecycle, E1's role in membrane fusion and its contributions to immunogenic responses are critical for both understanding the virus's pathogenicity and developing effective vaccination strategies.

Alternate Names for CHIKV E1

CHIKV; E2; E1; Chikungunya virus; Chikungunya Virus E2 glycoprotein; E2 glycoprotein; Chikungunya Virus E1 glycoprotein; E5 glycoprotein; CHIKV E1; Chikungunya virus E1 protein

• Chikungunya Virus Research Solutions

• 1. Weber, Christopher, et al.A small antigenic determinant of the chikungunya virus e2 protein is sufficient to induce neutralizing antibodies which are partially protective in mice. Plos Neglected Tropical Diseases, vol. 9, no. 4, 2015, p. e0003684.
  2. Fumagalli, Marcílio, et al. Enzyme-linked immunosorbent assay using recombinant envelope protein 2 antigen for diagnosis of chikungunya virus. Virology Journal, vol. 15, no. 1, 2018.