Lipopolysaccharide from Shigella flexneri serotype 2a and antigens from enterotoxigenic Escherichia coli (S. flexneri 2a LPS and ETEC antigens)

Lipopolysaccharide (LPS) from *Shigella flexneri* serotype 2a is a complex glycolipid forming the major component of the bacterium’s outer membrane. It comprises lipid A, a core oligosaccharide, and an O-antigen polysaccharide; specific features (chain length, acetylation, glucosylation) impact its role in acid resistance, immune evasion, and virulence. ETEC “antigens” commonly refer to surface-exposed molecules including colonization factors (e.g., CFA/I, CS6, CS21), toxins (heat-labile LT, heat-stable ST), and other outer membrane proteins, which mediate bacterial attachment, toxin delivery, and host interaction. Both components are leading targets for vaccine development due to their immunogenicity and central role in pathogenesis. It is important to note that this entry combines two distinct molecular entities; for structured databases, these would typically be treated as separate targets, e.g., 'Lipopolysaccharide from Shigella flexneri serotype 2a' and specific 'Enterotoxigenic Escherichia coli (ETEC) antigen [specify which]'.

Other names

S. flexneri 2a LPSShigella flexneri serotype 2a lipopolysaccharideETEC antigens (may refer to heat-labile toxin (LT), heat-stable toxin (ST), and colonization factor antigens such as CFA/I, CS6, CS21, EtpA, among others)

Vaccine-induced immunity via antibody targeting of surface antigens; Neutralization or opsonization of pathogen by anti-LPS or anti-antigen antibodies; Some molecular agents may modulate TLR4 or other immunoreceptors