B-cell receptor specific for Streptococcus pneumoniae type 15B capsular polysaccharide (BCR-Spn15B)

The B-cell receptor (BCR) specific for Streptococcus pneumoniae type 15B capsular polysaccharide is a membrane-bound immunoglobulin complex located on the surface of B lymphocytes. Its primary biological function is the specific recognition of the 15B serotype-specific epitopes found on the pneumococcal capsule, which triggers intracellular signaling pathways leading to B-cell proliferation and the secretion of high-affinity antibodies. In the context of infectious disease, this receptor is critical for the development of adaptive immunity against invasive pneumococcal disease caused by serotype 15B, a strain increasingly associated with antibiotic resistance and vaccine escape. This BCR is a primary therapeutic target for next-generation pneumococcal conjugate vaccines (PCVs), such as PCV20 and PCV21, which include the 15B polysaccharide to broaden protection. When these vaccines interact with the BCR, they stimulate the production of opsonizing antibodies that facilitate the clearance of the bacteria by phagocytes. Understanding the binding affinity and activation threshold of this receptor is essential for optimizing vaccine formulations and monitoring the efficacy of immunization programs in preventing pneumonia, meningitis, and sepsis.

Other names

Anti-pneumococcal type 15B B-cell receptorStreptococcus pneumoniae serotype 15B-specific BCRSurface immunoglobulin specific for pneumococcal polysaccharide 15B

Vaccine antigens (capsular polysaccharides) bind to the specific B-cell receptor, triggering B-cell activation, differentiation into plasma cells, and the production of protective IgG antibodies that opsonize the bacteria for phagocytosis.