SARS-CoV-2 Spike-specific B-cell receptor (Spike-BCR)

The SARS-CoV-2 Spike-specific B-cell receptor (BCR) is a membrane-bound immunoglobulin complex expressed on the surface of naïve B cells that possesses the specific paratope required to recognize and bind the viral Spike (S) protein (Source: Nature, doi:10.1038/s41586-020-2550-z). These receptors serve as the primary sensors for the viral antigen during both natural infection and vaccination, initiating the adaptive immune response. Upon binding the Spike protein, the BCR undergoes clustering and triggers intracellular signaling cascades involving kinases like Lyn and Syk, which lead to B-cell activation, proliferation, and differentiation into high-affinity antibody-secreting plasma cells and long-lived memory B cells (Source: Science, doi:10.1126/science.abe1102). In the context of therapeutic development, the Spike-specific BCR is the fundamental target of COVID-19 vaccines, which are designed to present the Spike protein in a stable conformation to optimally engage these receptors (Source: Cell, doi:10.1016/j.cell.2020.10.051). The efficiency of this interaction determines the speed and breadth of the neutralizing antibody response, which is critical for protection against emerging SARS-CoV-2 variants (Source: Nature Medicine, doi:10.1038/s41591-021-01328-3). Monitoring the frequency and affinity of these receptors in the naïve repertoire is a key biomarker for predicting vaccine efficacy and understanding the durability of immunological memory (Source: Immunity, doi:10.1016/j.immuni.2021.03.012).

Other names

SARS-CoV-2 Spike-reactive B-cell receptorSpike-binding B-cell receptorAnti-Spike B-cell receptorSARS-CoV-2 S-protein specific BCR

Antigen-mediated B-cell receptor activation and clonal expansion