This family represents the B subunit of shiga-like toxin (SLT or verotoxin) produced by some strains of E.coli associated with hemorrhagic colitis and hemolytic uremic syndrome. SLT's are composed of one enzymatic A subunit and five cell binding B subunits.

1: A mutant Shiga-like toxin IIe bound to its receptor Gb(3): structure of a group II Shiga-like toxin with altered binding specificity. Ling H, Pannu NS, Boodhoo A, Armstrong GD, Clark CG, Brunton JL, Read RJ; Structure Fold Des 2000;8:253-264. PMID:10745005