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Neisseria meningitidis group X capsular polysaccharide (MenX CPS)

Target: MenX CPS
Molecular classification: Other (Bacterial capsule polysaccharide), Protective antigen

Overview

The **Neisseria meningitidis group X capsular polysaccharide** is a linear homopolymer composed of (α-1→4)-linked N-acetylglucosamine-1-phosphate residues, forming a dense hydrophilic capsule on the bacterial surface that is critical for virulence and immune evasion[2][9]. Expression of this polysaccharide is encoded by genes at the cps locus, specifically the csx operon for group X, and loss of the capsule abrogates virulence[3]. MenX CPS is the immunodominant antigen for serogroup X and a primary target for vaccine and monoclonal antibody development, serving as a marker for diagnosis and vaccine efficacy[2][3][9].

Other names: MenX capsule polysaccharideGroup X polysaccharideNeisseria meningitidis serogroup X capsular polysaccharide

Mechanism of action

Induction of bactericidal antibodies (vaccines or monoclonal antibodies target MenX CPS to opsonize and promote complement-mediated killing of *N. meningitidis* X)

Biological functions

Immune evasion (protects bacteria against host immune system by preventing phagocytosis and complement activation)Virulence factor (essential for systemic infection)Vaccine antigen (targeted in conjugate vaccine development)

Disease associations

Infection (critical determinant for invasive meningococcal disease caused by serogroup X)

Safety considerations

Polysaccharide vaccines in children and certain populations may produce poor immune memory or hyporesponsiveness; conjugate vaccines address this, but safety is generally highAutoimmunity/side effects are rare but possible concerns with any polysaccharide-based vaccine.

Interacting drugs

meningococcal group X polysaccharide conjugate vaccines

1 more in the full profile.

Biomarkers

Anti-MenX antibody levels (used to monitor vaccine efficacy and patient immune response)

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