Severe acute respiratory syndrome coronavirus 2 viral epitopes (SARS-CoV-2 epitopes) (SARS-CoV-2 epitopes)

SARS-CoV-2 viral epitopes are specific molecular regions of the Severe Acute Respiratory Syndrome Coronavirus 2 that are recognized by the host immune system, specifically by antibodies and T-cell receptors (Grifoni et al., 2020, Cell Host & Microbe). The most prominent epitopes are located on the Spike (S) protein, particularly within the receptor-binding domain (RBD), which is critical for the virus's ability to bind to the human Angiotensin-Converting Enzyme 2 (ACE2) receptor and enter host cells (Hoffmann et al., 2020, Cell). Other significant epitopes are found on the Nucleocapsid (N), Membrane (M), and Envelope (E) proteins, which play roles in viral assembly and structural integrity (UniProt, 2021). These epitopes are the fundamental components used in the design of mRNA, viral vector, and protein subunit vaccines, such as BNT162b2 and mRNA-1273 (Polack et al., 2020, NEJM; Baden et al., 2021, NEJM). Therapeutic strategies focus on blocking these epitopes with monoclonal antibodies like Sotrovimab or Casirivimab to prevent viral entry or mark the virus for destruction (Gottlieb et al., 2021, JAMA). However, the rapid evolution of the virus leads to mutations in these epitope regions, potentially resulting in immune escape and reduced efficacy of existing medical countermeasures (Harvey et al., 2021, Nature Reviews Microbiology). Continuous monitoring of epitope changes is essential for the development of next-generation vaccines and therapeutics (WHO, 2023).

Other names

SARS-CoV-2 antigensCOVID-19 epitopesSpike protein epitopesNucleocapsid protein epitopesSARS-CoV-2 T-cell epitopesSARS-CoV-2 B-cell epitopes

Neutralization of viral entry by blocking the receptor-binding domain (RBD) of the Spike protein, thereby preventing interaction with the host ACE2 receptor, and the induction of adaptive immune responses including neutralizing antibodies and T-cell activation (Hoffmann et al., 2020, Cell; Grifoni et al., 2020, Cell Host & Microbe).