Target intelligence / Profile preview

Polysaccharide II Antigen (PSII)

Target: PSII
Molecular classification: Polysaccharide, Antigen

Overview

The PSII polysaccharide antigen is a cell surface carbohydrate structure found on the bacterium *Clostridioides difficile*. It is a polyhexasaccharide, meaning it consists of repeating units of six sugar residues, and contains an immunogenic phosphate moiety that is key to its recognition by the immune system. All clinical strains of *C. difficile* express this antigen, making it a highly conserved and attractive target for vaccine development and serological studies.

Mechanism of action

Antibodies targeting PSII mediate complement fixation and opsonization, leading to enhanced phagocytosis and bacterial clearance.

Biological functions

Immune recognitionBacterial surface componentOpsonizationComplement fixation

Disease associations

InfectionClostridioides difficile infection

Safety considerations

Potential for immune evasion through structural modifications.Need for robust antibody response to ensure protection.

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