Pan-coronavirus antigens (Pan-CoV antigens)

Pan-coronavirus antigens are conserved protein regions found across various members of the Coronaviridae family, serving as the primary focus for the development of universal vaccines and broad-spectrum monoclonal antibodies (Morens et al., 2022). The most prominent of these antigens is the S2 subunit of the Spike protein, which facilitates viral-host membrane fusion and exhibits significantly higher sequence conservation than the S1 receptor-binding domain (Walls et al., 2020). Other targets include the Nucleocapsid (N) protein, which is essential for viral RNA packaging and is a potent inducer of cross-reactive T-cell responses (Dutta et al., 2020). By focusing on these stable epitopes, therapeutic interventions aim to provide variant-proof protection against SARS-CoV-2, MERS-CoV, and potential future zoonotic coronaviruses (Saunders et al., 2021). Current drug development efforts include nanoparticle vaccines that present a mosaic of these antigens and the isolation of broadly neutralizing antibodies that bind to the stem helix or other conserved regions of the Spike protein. These antigens are critical for overcoming the limitations of current vaccines, which often lose efficacy as the virus evolves new mutations in highly variable regions. Furthermore, targeting pan-coronavirus antigens is a proactive strategy to mitigate the impact of future pandemics caused by novel coronaviruses jumping from animals to humans.

Other names

Universal coronavirus antigensConserved coronavirus epitopesBroadly neutralizing coronavirus targetsPan-CoV antigens

Neutralization of viral entry by binding to conserved epitopes, inhibition of viral-host membrane fusion, and induction of cross-reactive T-cell and B-cell memory responses.