CHIKV E3

CHIKV E3 Full Name

Chikungunya virus E3 protein

CHIKV E3 Introduction

The E3 glycoprotein of Chikungunya virus (CHIKV) plays a versatile role in the viral life cycle, particularly during the assembly and entry phases of the virus. Although E3 is not incorporated into mature virions, its presence has critical implications for the stability of the E2-E1 dimer and the overall viral envelope structure. The E3 protein is cleaved from the precursor protein p62 during the viral maturation process, and while it is released into the culture medium, it plays a pivotal role in the proper folding and functionality of the E2 and E1 proteins. Structural studies utilizing cryo-electron microscopy have shown that E3 interacts with the E2 glycoprotein, primarily through hydrophobic interactions that contribute to the stability of the E2-E1 dimer. These interactions are especially important under acidic conditions, which are typically encountered during viral entry into host cells. Notably, the retention of E3 can protect the E1 protein from degradation and preserve the structural integrity of the glycoprotein complex. This protective role underscores the potential of E3 as a target for neutralizing antibodies, as antibodies against E3 have been shown to confer some degree of protection in animal models.

Figure 1. Chikungunya virus (CHIKV) Envelope Protein E3.

Furthermore, the E3 protein is involved in the pH-dependent conformational changes that enable membrane fusion. Mutations in E3 have been shown to disrupt the stability of E1 and E2, which can lead to defects in the viral reproduction cycle. The E3-E2 interaction has also been noted to be crucial during virus assembly, as it stabilizes the glycoprotein complex essential for the formation of infectious particles. Research has also suggested potential therapeutic avenues involving E3, including small-molecule inhibitors that could disrupt the E3-E2 interaction, thereby impacting the virus's ability to replicate and infect host cel. Understanding the precise molecular interactions and functional contributions of E3 in the context of CHIKV pathogenesis is vital for the development of effective vaccines and antiviral therapies.

In summary, CHIKV E3 glycoprotein serves as a critical stabilizing factor for the envelope glycoproteins E1 and E2, facilitating their proper assembly and function during the viral life cycle. Continued exploration of E3's role and interactions within the viral envelope will provide valuable insights that could inform novel strategies for combating CHIKV infection.

Alternate Names for CHIKV E3

Chikungunya virus; Chikungunya; CHIKV; CHIKV E3; Chikungunya virus E3 protein; Chikungunya Virus E3 glycoprotein

• Chikungunya Virus Research Solutions

• 1. Tumkosit, Uranan, et al. Anti-chikungunya virus monoclonal antibody that inhibits viral fusion and release. Journal of Virology, vol. 94, no. 19, 2020.
  2. Passos, Gabriel, et al. Computer-aided design, synthesis, and antiviral evaluation of novel acrylamides as potential inhibitors of e3-e2-e1 glycoproteins complex from chikungunya virus. Pharmaceuticals, vol. 13, no. 7, 2020, p. 141.