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Klebsiella pneumoniae O-antigen Polysaccharide (O-antigen)
- Target
- O-antigen
- Molecular classification
- Polysaccharide, Lipopolysaccharide component
01
Overview
The Klebsiella pneumoniae O-antigen polysaccharide is a structurally variable but functionally critical molecule that contributes significantly to bacterial survival during infection. It is a key component of the lipopolysaccharide (LPS) layer found on the outer membrane of Klebsiella pneumoniae. Its conserved features among dominant clinical isolates make it an important focus for diagnostics, therapeutics and vaccine design efforts aimed at combating multidrug-resistant K. pneumoniae. It protects against host immune responses, including complement-mediated killing and phagocytosis. There are several serotypes based on structural variations in these polysaccharides, with the most common clinically relevant serotypes being O1, O2, O3, and O5.
- Other names
- Klebsiella pneumoniae O-polysaccharideK. pneumoniae O-antigenO-antigen polysaccharideKlebsiella O-antigenLPS O-antigenO polysaccharide
02
Mechanism of action
Antibodies targeting the O-antigen can mediate opsonophagocytic activity, agglutination, complement activation via classical pathway, and direct bactericidal effects.
03
Biological functions
Immune evasionSerum resistanceComplement inhibitionPhagocytosis inhibitionBiofilm formationBacterial virulence
04
Disease associations
InfectionKlebsiella pneumoniae infectionPneumoniaSepsisUrinary tract infectionMultidrug-resistant bacterial infections
05
Safety considerations
Serotype variabilityNeed for broad coverage across major serotypes for effective vaccine developmentPotential for immune escape through O-antigen modification
06
Biomarkers
O-antigen serotypeD-gal I epitopeD-gal III epitope
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