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

The Norovirus VP1 P domain (GI.1) is the surface-exposed region of the major capsid protein VP1 of the Genogroup I, Genotype 1 norovirus, which is the prototypical Norwalk virus (Prasad et al., 1999, Science). This domain plays a pivotal role in viral infection by mediating attachment to host cells through interactions with Histo-Blood Group Antigens (HBGAs) (Tan & Jiang, 2005, J Virol). Structurally, the P domain is composed of P1 and P2 subdomains, where the P2 subdomain forms the most distal part of the viral capsid and contains the HBGA-binding interface (Donaldson et al., 2010, Immunol Rev). As the primary target for neutralizing antibodies, the P domain is the central component in the development of norovirus vaccines, such as Virus-Like Particles (VLPs) and P-particle candidates (Atmar et al., 2011, NEJM). Therapeutic strategies targeting this domain focus on small-molecule HBGA mimetics that competitively inhibit viral binding or monoclonal antibodies that block entry. Understanding the structural variability of the P domain is essential for addressing the challenges of strain diversity and antigenic drift in norovirus outbreaks.

Other names

Norwalk virus VP1 P domainProtruding domain of VP1GI.1 VP1 P domainNorovirus P domain

Inhibition of viral attachment to host histo-blood group antigens (HBGAs) and neutralization of viral entry through competitive binding or steric hindrance.