Norovirus major capsid protein VP1 P domain (VP1 P domain)

The Norovirus major capsid protein VP1 P domain is the surface-exposed, protruding region of the virus's primary structural protein. It is functionally divided into the P1 stalk and the P2 head subdomains, with the P2 subdomain containing the critical receptor-binding site for host histo-blood group antigens (HBGAs) (Cao et al., 2007; Tan et al., 2004). This interaction is the first and essential step for viral attachment and entry into the host's intestinal epithelial cells (Koppisetty et al., 2010). As the most distal and variable part of the virion, the P domain is the primary target for neutralizing antibodies and the focus of vaccine development, including virus-like particle (VLP) and P-particle candidates like TAK-214 (NIH, 2022). However, the P2 subdomain undergoes rapid antigenic drift, leading to the emergence of new variants that can escape existing herd immunity (MDPI, 2019). Therapeutic strategies targeting this region include small-molecule HBGA mimics and monoclonal antibodies designed to block the receptor-binding pocket (PubMed, 2016). Understanding the structural plasticity and binding specificity of the P domain is vital for creating broadly protective interventions against norovirus-induced gastroenteritis (bioRxiv, 2024). The domain's ability to form stable dimers and higher-order particles even when isolated makes it a versatile tool for structural biology and vaccine design.

Other names

P domainProtruding domainVP1 P2 subdomainNorovirus attachment proteinVP1 receptor-binding regionP-dimerP-particle

Blocking the interaction between the viral P2 subdomain and host histo-blood group antigens (HBGAs) to prevent viral attachment and entry into host cells.