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Primary Structure and Specificity of a New Member of Galectin Family from the Amethyst Deceiver Mushroom Laccaria amethystina

A new galectin was characterized in the Amethyst deceiver mushroom Laccaria amethystina. The complete amino acid (AA) sequence of the lectin, which exhibited β-galactoside specificity, was deduced from its peptide sequences. The AA sequence of L. amethystina galectin (LAG) showed high homology with those of the same genus, at 75.6% identity to Laccaria bicolor, and 35.5–65.0% to galectins of Agrocybe spp. and Coprinopsis cinerea. The AA sequence of LAG contained all but one conserved residue known to be involved in β-galactoside binding, with His at the position 57 residue replaced by Thr in LAG. Analysis of binding specificity by hemagglutination inhibition assay and enzyme-linked lectin-sorbent assay revealed high specificity of LAG towards O-glycoproteins.