Rotavirus VP7 and VP4 surface glycoproteins (VP7/VP4)

Rotavirus VP7 and VP4 are the two primary proteins that constitute the outer layer of the rotavirus capsid and are the critical determinants of viral infectivity. VP7 is a calcium-binding glycoprotein that forms the smooth surface of the virion, while VP4 forms the biochemical spikes required for attachment to host cell receptors and subsequent membrane penetration (UniProt P12473, P12472). These proteins are the major targets for neutralizing antibodies, making them the central focus of vaccine development and therapeutic antibody research (PubMed, 2021). In clinical practice, the antigenic diversity of these proteins defines the G (glycoprotein) and P (protease-sensitive) serotypes used to classify rotavirus strains globally (WHO, 2022). Vaccines such as Rotarix and RotaTeq work by presenting these native viral epitopes to the immune system to elicit a protective response against severe gastroenteritis (CDC, 2023). Additionally, novel treatments like nanobodies (e.g., ARP1) are designed to bind specifically to these surface glycoproteins to prevent viral entry or decapsidation in the gut (Nature Communications, 2017).

Other names

Outer capsid protein VP7Outer capsid protein VP4G protein (VP7)P protein (VP4)Rotavirus spike proteinVP7 glycoproteinVP4 protease-sensitive proteinNative rotavirus surface epitopes

Neutralization of viral infectivity by blocking attachment to host receptors, inhibition of viral entry/penetration, and induction of protective mucosal IgA and systemic IgG antibodies.