This is the C-terminal domain of the beta chain found in Polyporus squamosus lectin protein (PSL). PSL binds specifically to glycans terminating with the sequence: Neu5Ac.alpha2-6Gal.beta. The C-terminal domain is not involved in the binding to the Neu5Ac.alpha2-6Gal.beta. The C-terminal domain is characterized by a central five-stranded beta-sheet that is flanked by three alpha-helices and topped by a short strand. It shows high fold similarity to its closest relative, the Gal.alpha1-3Gal-binding agglutinin from the mushroom Marasmius oreades agglutinin (MOA) [1].

1: Structure and binding analysis of Polyporus squamosus lectin in complex with the Neu5Ac{alpha}2-6Gal{beta}1-4GlcNAc human-type influenza receptor. Kadirvelraj R, Grant OC, Goldstein IJ, Winter HC, Tateno H, Fadda E, Woods RJ; Glycobiology. 2011;21:973-984. PMID:21436237