Vibrio cholerae O1 and O139 O-antigen

The Vibrio cholerae O1 and O139 O-antigens are complex carbohydrate structures that form part of the bacterial outer membrane LPS. The O1 O-antigen is a homopolymer of perosamine with serotype-specific methylation patterns, while the O139 O-antigen derives from a genetic replacement event and is linked to the formation of a protective capsule[1][2][5][7]. Both antigens are critical virulence factors, mediating immune evasion and bacteriophage resistance, and act as primary immunological targets for vaccine design. Detection of these antigens allows for classification of epidemic-causing strains and guides public health interventions[1][2][3][8]. Only O1 and O139 antigen-positive V. cholerae cause large-scale, toxigenic cholera; other serogroups have alternative epidemiological and clinical profiles[2][8][9]. Key technical points: - O1 serogroup is further divided into "Ogawa," "Inaba," and "Hikojima" serotypes based on methylation patterns of the terminal perosamine in the O-antigen[2][7]. - O139 arose from a gene replacement that converted an O1 El Tor strain into an O139 strain, changing its antigenic profile and enabling it to infect previously immune populations[5][6][1]. - Both are targets for oral cholera vaccines, which protect by inducing anti-O-antigen antibodies[3]. - Antigenic variation and genetic plasticity in these loci are important considerations for vaccine and therapeutic development[3][4][6]. If additional structural or biochemical data are needed, such as precise repeating unit composition or links to genetic loci, consult original sources for schematics and gene cluster details[1][5][6].

Other names

O1 O-antigenO139 O-antigenVibrio cholerae O1 antigenVibrio cholerae O139 antigenV. cholerae O1 LPS antigenV. cholerae O139 LPS antigen

Vaccine: Induces production of protective antibodies targeting the O1 and/or O139 antigens. Antibodies: Bind O-antigens, leading to opsonization and clearance of bacteria