Classical Swine Fever Virus envelope glycoprotein E2 (CSFV E2) (CSFV E2)

The Classical Swine Fever Virus (CSFV) E2 protein is the major envelope glycoprotein and a primary determinant of viral virulence and host range [UniProt: P19712]. It exists as a homodimer or a heterodimer with the E1 protein on the viral surface, where it facilitates viral entry by binding to host cell receptors such as heparan sulfate and laminin receptor [PubMed: 25855244]. As the most immunogenic protein of CSFV, E2 is the principal target for neutralizing antibodies, making it the cornerstone of modern subunit vaccine development and diagnostic assays [PubMed: 30643324]. In the context of disease, E2 is essential for the infection of porcine macrophages and endothelial cells, leading to the hemorrhagic fever characteristic of Classical Swine Fever. Therapeutic strategies primarily focus on E2-based subunit vaccines that allow for the differentiation of infected from vaccinated animals (DIVA), a crucial feature for disease eradication programs [PubMed: 28933450]. The protein contains four major antigenic domains (A, B, C, and D) that are critical for inducing a protective immune response in swine. Beyond its role in entry, E2 has been implicated in modulating the host innate immune response, specifically by interacting with host proteins to inhibit interferon production [PubMed: 31142500]. Due to its high variability among different CSFV genotypes, E2 is also used for phylogenetic analysis and molecular epidemiology of the virus.

Other names

gp55Envelope glycoprotein E2E2 proteinClassical swine fever virus E2

Vaccines targeting the E2 protein work by inducing high titers of neutralizing antibodies that bind to the E2 glycoprotein on the virion surface, thereby preventing the virus from attaching to and entering host cells [PubMed: 30643324].