Norovirus major capsid protein VP1 (genotype GII.4) (VP1)

The Norovirus VP1 capsid protein is the primary structural component of the norovirus virion, specifically for the GII.4 genotype which is the predominant cause of viral gastroenteritis outbreaks worldwide (Tohma et al., 2019, Journal of Virology). The protein is organized into two main structural domains: the Shell (S) domain, which forms the internal icosahedral scaffold, and the Protruding (P) domain (Prasad et al., 1999, Science). The P domain is further divided into P1 and P2 subdomains, with P2 being the most surface-exposed region containing the binding sites for histo-blood group antigens (HBGAs) (Tan and Jiang, 2005, Trends in Microbiology). These HBGAs serve as essential attachment factors for viral entry into host cells, making the P2 subdomain a critical site for neutralization (Lindesmith et al., 2003, Nature Medicine). As the principal target for the host immune system, VP1 is the primary focus for vaccine development, typically utilizing virus-like particles (VLPs) that mimic the viral structure (Atmar et al., 2011, New England Journal of Medicine). However, the GII.4 genotype is notorious for "epochal evolution," where rapid antigenic drift in the P2 domain allows the virus to escape existing population immunity (Lindesmith et al., 2012, Nature Medicine). Consequently, therapeutic and preventive strategies must account for the continuous emergence of new GII.4 variants to maintain efficacy.

Other names

Major capsid proteinVP1 proteinCapsid protein VP1Shell proteinP domain-containing protein

Induction of neutralizing antibodies that block the interaction between the VP1 P domain and host histo-blood group antigens (HBGAs), or direct steric inhibition of the HBGA binding site by small molecules or antibodies (Tan et al., 2005; Atmar et al., 2011).