Norovirus GI.1 major capsid protein VP1 P domain (GI.1 VP1 P domain)

The Norovirus GI.1 VP1 P domain is the surface-exposed, protruding region of the major capsid protein (VP1) of the Norwalk virus, the prototype strain for Genogroup I noroviruses (PubMed: 12915522). This domain is critical for viral pathogenesis as it contains the binding pockets for histo-blood group antigens (HBGAs), which serve as the primary attachment factors on human intestinal cells (PubMed: 24915460). Structurally, the P domain is divided into P1 and P2 subdomains; the P2 subdomain is the most distal part of the capsid and contains the highly variable loops that dictate host specificity and serve as the main targets for neutralizing antibodies (UniProt: P03555). Because it mediates the initial stages of viral entry, the P domain is a primary focus for the development of vaccines, such as virus-like particles (VLPs), and small-molecule entry inhibitors (PubMed: 25817401). Current therapeutic strategies aim to block the P domain-HBGA interaction using carbohydrate mimetics or to elicit broad-spectrum neutralizing antibodies that can overcome the virus's significant antigenic diversity (PubMed: 30104445).

Other names

Norwalk virus VP1 P domainGI.1 P domainNorovirus genogroup I genotype 1 capsid protein P domainVP1 protruding domain

Steric or competitive inhibition of the interaction between the viral P2 subdomain and host histo-blood group antigens (HBGAs), preventing viral attachment and entry (PubMed: 30104445).