Salmonella Paratyphi A O-antigen-specific B-cell receptor (SPA O-antigen BCR) (SPA O-antigen BCR)

The Salmonella Paratyphi A O-antigen-specific B-cell receptor is a membrane-bound immunoglobulin complex located on the surface of B lymphocytes that specifically recognizes the O:2 polysaccharide component of the Salmonella Paratyphi A lipopolysaccharide (PubMed, 2021). This receptor is a critical component of the adaptive immune system, serving as the primary sensor for detecting Paratyphi A infections and initiating the production of protective antibodies (Nature Reviews Immunology, 2020). Upon binding to its cognate O-antigen, the receptor triggers intracellular signaling pathways that lead to B-cell activation, clonal expansion, and differentiation into long-lived memory B cells and antibody-secreting plasma cells (Journal of Infectious Diseases, 2023). In the context of pharmaceutical development, these receptors are the intended targets of conjugate vaccines, which utilize the O-specific polysaccharide (OSP) to elicit a robust, T-cell dependent immune response (Vaccine, 2019). Monitoring the frequency and activation state of these receptors provides essential biomarkers for assessing vaccine immunogenicity and the status of naturally acquired immunity in endemic populations (The Lancet Infectious Diseases, 2022).

Other names

O:2-specific B-cell receptorSalmonella Paratyphi A O-polysaccharide BCRSPA O-antigen-specific BCRSalmonella enterica serovar Paratyphi A O-antigen B-cell receptor

Vaccines act as agonists that bind and cross-link these receptors, initiating signaling cascades that lead to B-cell differentiation into plasma cells and memory cells, thereby providing protective immunity (PubMed, 2021).