Neisseria meningitidis serogroup Y capsular polysaccharide antigen

The Neisseria meningitidis serogroup Y capsular polysaccharide antigen is a carbohydrate (polysaccharide) structure forming the outer capsule of Neisseria meningitidis strains classified as serogroup Y. This capsule is the basis of antigenic typing by serogroup, is essential for bacterial survival in the bloodstream, and serves as a key virulence factor by protecting the organism from host immune defenses. The antigen is used in meningococcal conjugate vaccines (such as MenACWY), which induce protective antibody responses and prevent invasive meningococcal disease caused by serogroup Y strains[10][2][5]. The antigen does not function as a receptor, enzyme, or transporter, but rather as a structural and immunogenic component critical for infection, prevention, and serological classification. If you need a mapping or more detail on the specific carbohydrate structure, it consists of a homopolymer of N-acetyl-D-glucosamine-α(2→6)-N-acetyl-D-glucosamine; this "poly-GlcNAc" coil is what constitutes the immunologically reactive serogroup Y capsular polysaccharide[10].

Other names

Meningococcal serogroup Y capsuleSerogroup Y CPS (capsular polysaccharide)Group Y polysaccharide antigen

Induce production of protective antibodies against serogroup Y antigen by presenting the polysaccharide conjugated to a protein carrier, thereby triggering a T-cell dependent immune response (for conjugate vaccines)