Enterotoxigenic Escherichia coli B7A surface antigen

Enterotoxigenic Escherichia coli (ETEC) B7A surface antigens comprise a heterogeneous collection of proteins and glycoproteins located on the bacterial outer membrane, including colonization factor antigens (such as CS6), autotransporters (such as antigen 43 and EatA), fimbrial subunits, and other virulence-associated proteins. These molecules mediate ETEC’s initial adhesion to intestinal epithelial cells, facilitate colonization and persistence, and modulate host immune responses. In ETEC B7A specifically, CS6 is the principal colonization factor, and sequence analyses indicate the presence of additional surface-exposed proteins such as Ag43, pAT, and dispersin-like proteins (CexE), but strain B7A does not carry all antigens found in some other ETEC strains, notably lacking the EtpA adhesin[2][4][5][6]. Immune responses to these antigens are detectable in infected hosts, and several are under consideration as vaccine targets due to their role in virulence and ability to elicit protective immunity. However, antigenic variation poses a challenge for broad-coverage vaccine design[2][7][4][5]. Note: For structured target data or experimental work, it is recommended to refer to individual well-characterized antigens such as "CS6 fimbrial subunit CssA" or "antigen 43" rather than the general category "ETEC B7A surface antigens"[2][4].

Other names

ETEC B7A surface proteinsSurface-exposed antigens of ETEC B7AETEC B7A outer membrane antigens

As vaccine antigens: induce production of neutralizing antibodies blocking bacterial adhesion or neutralizing virulence factors[2][7].