Neisseria meningitidis serogroup A capsular polysaccharide-specific B-cell receptor (MenA CPS-specific BCR)

The Neisseria meningitidis serogroup A capsular polysaccharide-specific B-cell receptor is a specialized membrane-bound immunoglobulin found on the surface of specific B lymphocytes. Its primary biological function is the recognition and binding of the (alpha 1 to 6)-linked N-acetyl-D-mannosamine-1-phosphate polymer that constitutes the capsule of serogroup A meningococci (Source: PubMed, PMID: 22434416). Upon binding to this antigen, particularly when presented in a conjugated form with a carrier protein, the receptor initiates B-cell activation and differentiation into antibody-secreting plasma cells and memory B cells (Source: CDC, Meningococcal Disease). This process is critical for providing long-term immunity against Neisseria meningitidis serogroup A, a leading cause of epidemic meningitis and sepsis, especially in the African meningitis belt (Source: WHO, Meningococcal meningitis). Therapeutic interventions, primarily in the form of conjugate vaccines like MenAfriVac, target these receptors to elicit a robust T-cell dependent immune response (Source: PATH, MenAfriVac). By stimulating these specific B-cell receptors, vaccines effectively prevent invasive meningococcal disease and reduce nasopharyngeal carriage of the bacteria.

Other names

MenA polysaccharide-specific B-cell receptorNeisseria meningitidis serogroup A capsular polysaccharide-specific BCRB-cell receptor for MenA CPSSerogroup A meningococcal polysaccharide-specific BCR

The mechanism of action involves the binding of the vaccine antigen (either the plain capsular polysaccharide or a polysaccharide-protein conjugate) to the B-cell receptor (BCR) on the surface of naive or memory B cells. This binding event triggers BCR clustering and activates intracellular signaling pathways, such as the Lyn/Syk and PLC-gamma-2 cascades, leading to B-cell proliferation and differentiation. In the case of conjugate vaccines, the carrier protein allows for T-cell involvement, resulting in isotype switching to high-affinity IgG and the generation of long-lived memory B cells that provide durable protection against Neisseria meningitidis serogroup A infection.