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Target intelligence / Profile preview
Streptococcus pneumoniae Capsular Polysaccharide Antigens (Serotypes 4, 6B, 9V, 14, 18C, 19F, and 23F) (Pn CPS)
- Target
- Pn CPS
- Molecular classification
- Polysaccharide, Bacterial Surface Antigen, Capsular Polysaccharide
01
Overview
Streptococcus pneumoniae capsular polysaccharide antigens are complex carbohydrate structures that form a capsule surrounding the bacterium. These capsules are the primary virulence factors of S. pneumoniae because they protect the bacteria from phagocytosis by host immune cells and interfere with opsonophagocytic clearance mechanisms. Each serotype is defined by unique structural features in its capsular polysaccharide. These antigens are targets for pneumococcal vaccines (polysaccharide and conjugate), which induce serotype-specific antibody responses.
- Other names
- Pneumococcal Capsular PolysaccharideS. pneumoniae CPSSerotype-Specific PolysaccharideCapsular Polysaccharide Serotypes 4, 6B, 9V, 14, 18C, 19F, 23F
02
Mechanism of action
Antibodies bind to the capsular polysaccharide, opsonizing the bacteria and facilitating phagocytosis and complement-mediated killing.
03
Biological functions
Protection from phagocytosisEvasion of host immune responseBacterial virulenceAdhesion
04
Disease associations
PneumoniaMeningitisBacteremiaOtitis MediaInvasive Pneumococcal Disease (IPD)Infection
05
Safety considerations
Serotype replacementLimited efficacy in young children (for polysaccharide vaccines)Potential for vaccine failure due to serotype mismatch
06
Interacting drugs
PPSV23 (Pneumovax 23)
4 more in the full profile.
07
Biomarkers
Anti-capsular polysaccharide antibody levels (IgG)Serotype-specific antibody titers
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