Shigella sonnei outer membrane antigen

Shigella sonnei outer membrane antigens comprise a group of surface-exposed bacterial molecules, most notably outer membrane proteins (OMPs) such as OmpA and OmpC, and the O antigen polysaccharide component of lipopolysaccharide (LPS) and its high molecular weight exopolysaccharide capsule[2][3][5][7]. The O antigen is the primary immunodominant and protective antigen of S. sonnei, critical for bacterial virulence, immune evasion, and survival within the host[2][5]. OMPs and the O antigen are key targets for the development of vaccines and serological diagnostics, because they induce a robust humoral immune response and can mediate protection in animal models and humans[1][3][5][7]. The antigenic diversity and structural specificity of these molecules pose challenges for broad-spectrum vaccine design, but novel approaches like GMMA (Generalized Modules for Membrane Antigens) and conjugate vaccines are in clinical development[5][7]. The presence of anti-O antigen or OMP antibodies in serum can serve as biomarkers for S. sonnei infection and vaccine efficacy[3][5]. Safety concerns include the risk of strain escape due to variability of the O antigen and limited cross-protection among serotypes[5][7].

Other names

Shigella sonnei outer membrane proteinS. sonnei OMPsS. sonnei outer membrane antigenS. sonnei O antigenS. sonnei O-antigen capsuleS. sonnei O antigen polysaccharideS. sonnei LPS O antigen

Induction of antibody-mediated immunity (neutralization, opsonization, complement activation) Blockade of bacterial virulence by antibody binding Inhibition of bacterial adhesion and invasion