Cholera toxin from Vibrio cholerae and the type I heat-labile enterotoxins (LT-Is) from Escherichia coli are oligomeric proteins with AB5 structures. The type II heat-labile enterotoxins (LT-IIs) from E. coli are structurally similar to, but antigenically distinct from, the type I enterotoxins ...
Cholera toxin from Vibrio cholerae and the type I heat-labile enterotoxins (LT-Is) from Escherichia coli are oligomeric proteins with AB5 structures. The type II heat-labile enterotoxins (LT-IIs) from E. coli are structurally similar to, but antigenically distinct from, the type I enterotoxins. The A subunits of type I and type II enterotoxins are homologous and activate adenylate cyclase by ADP-ribosylation of a G protein subunit, G8 alpha. However, the B subunits of type I and type II enterotoxins differ dramatically in amino acid sequence and ganglioside-binding specificity. The structure of LT-IIb was determined both as a prototype for other LT-IIs and to provide additional insights into structure/function relationships among members of the heat-labile enterotoxin family and the superfamily of ADP-ribosylating protein toxins.
Related Citations:
Crystal Structure of a Cholera Toxin-Related Heat-Labile Enterotoxin from E. Coli Sixma, T.K., Pronk, S.E., Kalk, K.H., Wartna, E.S., Van Zanten, B.A., Witholt, B., Hol, W.G. (1991) Nature 351: 371
Cloning, Nucleotide Sequence, and Hybridization Studies of the Type Iib Heat-Labile Enterotoxin Gene of Escherichia Coli Pickett, C.L., Twiddy, E.M., Coker, C., Holmes, R.K. (1989) J Bacteriol 171: 4945
Organizational Affiliation:
Department of Biological Structure and Biochemistry, University of Washington, Seattle 98195, USA.
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