Norovirus GII.3 major capsid protein (VP1) (VP1)

The Norovirus GII.3 major capsid protein (VP1) is the essential structural unit of the viral capsid, responsible for both protecting the viral RNA genome and mediating host cell recognition (UniProt: P03310). It is composed of two main domains: the S (shell) domain, which forms the internal scaffold, and the P (protruding) domain, which extends outward and interacts with host receptors (PubMed: 24965445). Specifically, the P2 subdomain within the P domain contains the binding pockets for histo-blood group antigens (HBGAs), which are the primary attachment factors for noroviruses (PubMed: 25589522). GII.3 is a significant genotype frequently associated with endemic and epidemic outbreaks of acute gastroenteritis, particularly in pediatric populations (PubMed: 30135128). Because it is the most immunogenic and exposed viral component, VP1 is the primary target for neutralizing antibodies and the central focus of vaccine strategies, such as virus-like particles (VLPs) and adenovirus-vectored vaccines (ClinicalTrials.gov: NCT04854746). Current drug development efforts also explore small-molecule inhibitors designed to occupy the HBGA-binding site, thereby preventing viral entry and infection. Understanding the structural evolution of the GII.3 capsid is vital for addressing the challenges of antigenic drift and ensuring broad-spectrum protection against emerging norovirus strains.

Other names

Major capsid proteinVP1GII.3 VP1Capsid protein VP1GII.3 major structural protein

Neutralization of viral particles and competitive inhibition of attachment to host histo-blood group antigens (HBGAs).