Members of this family are carbohydrate-specific lectin domains found in bacterial fimbrial adhesins. They adopt a compact, elongated structure consisting of a beta-sandwich with two major sheets: one consisting of five long strands in mixed orientations, and a front sheet with four antiparallel strands, forming an immunoglobin-like fold [1].

1: The fimbrial adhesin F17-G of enterotoxigenic Escherichia coli has an immunoglobulin-like lectin domain that binds N-acetylglucosamine. Buts L, Bouckaert J, De Genst E, Loris R, Oscarson S, Lahmann M, Messens J, Brosens E, Wyns L, De Greve H; Mol Microbiol. 2003;49:705-715. PMID:12864853