Escherichia coli surface antigen (null)

Escherichia coli surface antigens comprise a group of structurally and functionally diverse molecules present on the bacterial outer membrane and cell surface. The main classes include the O antigen (the outer polysaccharide of lipopolysaccharide), the K antigen (capsular polysaccharides), the H antigen (flagellin of the bacterial flagella), and a variety of fimbrial or pilus proteins (including specific adhesins such as Antigen 43 and CS26). These antigens are key determinants of pathogenesis, enabling immune evasion, environmental protection, biofilm formation, and tissue adhesion. They are also central to serotyping, strain discrimination, and the development of diagnostic and immunotherapeutic strategies. The term "surface antigens" encapsulates multiple unrelated molecular families, making it a conceptually broad and technically imprecise target for therapeutic intervention.

Other names

E. coli surface antigensE. coli O antigenE. coli K antigenE. coli H antigenE. coli fimbriae (pili)E. coli capsuleEscherichia coli LPS (for the O antigen-containing outer membrane lipopolysaccharide)

For vaccines or antibodies: Antigen-specific immune targeting—neutralization, opsonization, or complement activation against surface-exposed antigenic structures. Phages: Recognition and binding to surface antigens as receptors. Inhibitors of biosynthesis (in development): Block biosynthetic pathways for O antigen, capsule, or pili