Clostridioides difficile surface polysaccharide (PS-II)

Clostridioides difficile surface polysaccharides, primarily PS-I, PS-II, and PS-III, are complex glycan structures anchored to the bacterial cell wall that serve as critical antigenic determinants (Ganeshapillai et al., 2008). Among these, PS-II is the most prevalent and conserved across diverse clinical ribotypes, including hypervirulent strains, which positions it as a leading candidate for prophylactic and therapeutic interventions (Danieli et al., 2011). These glycans play a fundamental role in the bacterium's survival by maintaining cell wall integrity and mediating adherence to the host's intestinal mucosa, thereby facilitating colonization (Martin et al., 2013). Current drug development efforts focus on synthetic glycoconjugate vaccines and monoclonal antibodies that target these polysaccharides to induce opsonophagocytic killing by the host immune system (Oberli et al., 2011). Unlike traditional antibiotics or toxin-neutralizing agents, targeting these glycan antigens aims to prevent the initial establishment of C. difficile and reduce the high incidence of recurrent infections (Adamo et al., 2011).

Other names

Clostridium difficile glycan antigensC. difficile cell wall polysaccharidesPS-IPS-IIPS-IIIClostridioides difficile surface glycans

Induction of opsonophagocytic antibodies that facilitate bacterial clearance and inhibition of intestinal colonization by blocking bacterial adhesion to the mucosa (Oberli et al., 2011).