B-cell receptor specific for pneumococcal capsular polysaccharide (BCR-CPS) (BCR-CPS)

B-cell receptors (BCRs) specific for pneumococcal capsular polysaccharides are membrane-bound immunoglobulins on B lymphocytes that recognize the complex carbohydrate structures of the Streptococcus pneumoniae capsule (Source: PubMed, PMID: 22438538). These receptors are essential for the adaptive immune response, identifying specific bacterial serotypes to initiate the production of protective opsonizing antibodies (Source: StatPearls, NBK470537). Because pure polysaccharides are T-cell independent antigens, they typically stimulate marginal zone B cells to produce IgM without inducing long-term memory; however, conjugate vaccines allow the BCR to internalize the antigen-protein complex for presentation to T cells, leading to high-affinity IgG production and immunological memory (Source: CDC, Pneumococcal Disease). This interaction is the primary mechanism by which vaccines like PCV13 and PPSV23 prevent invasive diseases such as pneumonia, meningitis, and sepsis (Source: FDA, Prevnar 13 Label). Targeting these receptors remains a cornerstone of global immunization strategies to reduce the burden of bacterial infections in vulnerable populations (Source: WHO, Pneumococcal vaccines). The specificity and diversity of these receptors determine the breadth of protection offered by different vaccine formulations against the numerous known pneumococcal serotypes.

Other names

Anti-pneumococcal B-cell receptorPneumococcal polysaccharide-specific B-cell receptorCPS-specific B-cell receptorPneumococcal capsular polysaccharide-specific BCR

Binding of vaccine-derived capsular polysaccharides to the BCR triggers receptor clustering and signal transduction via the Ig-alpha/Ig-beta complex, leading to B-cell activation, clonal expansion, and differentiation into plasma cells that secrete protective opsonizing antibodies (Source: Janeway's Immunobiology).