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Neisseria meningitidis serogroup Y capsular oligosaccharide

Molecular classification: Other (Bacterial capsular polysaccharide antigen)

Overview

Neisseria meningitidis serogroup Y capsular oligosaccharide is a carbohydrate antigen found on the surface capsule of *Neisseria meningitidis* serogroup Y. This molecule is composed of repeating units of sialic acid derivatives, which allows the bacteria to evade the host immune system via molecular mimicry. It is essential both for bacterial virulence and for public health interventions, as it is the basis for serogroup classification and a key component of meningococcal vaccines. Antibodies directed against the serogroup Y oligosaccharide confer immunity by promoting killing of the bacteria and preventing invasive infection[2][5][6].

Other names: Neisseria meningitidis serogroup Y capsular polysaccharideNmY CPSNmY oligosaccharide

Mechanism of action

Vaccines that incorporate serogroup Y oligosaccharide elicit specific anti-Y antibody responses, activating complement-mediated killing and opsonophagocytosis; neutralization of the pathogen[6][5].

Biological functions

Immune evasion (capsule helps bacteria evade human immune system by molecular mimicry)Basis for serogroup specificity (used in classification and serodiagnostics)Antigen for vaccine-induced immune response

Disease associations

Infection (major role in invasive meningococcal disease, including meningitis and sepsis)

Safety considerations

Polysaccharide vaccines in young children are less immunogenic; conjugate vaccines are preferred.Risk of hyporesponsiveness with repeated vaccination using plain polysaccharide antigens.No notable direct toxicity related to the oligosaccharide itself; safety concerns relate to incomplete coverage, rare allergic reactions, or improper immune response[6].

Interacting drugs

Meningococcal conjugate vaccines (e.g., MenACWY; contain serogroup Y capsular polysaccharide conjugated to carrier proteins)

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Biomarkers

Anti-serogroup Y capsule antibodies (used to measure vaccine response and protection)

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