Series of multivalent α-l-fucoside containing glycoclusters and variously decorated l-fucosides were synthesized to find potential inhibitors of fucose-specific lectins and study the structure-binding affinity relationships. Tri- and tetravalent fucoclusters were built using copper-mediated azide-alkyne click chemistry. Series of fucoside monomers and dimers were synthesized using various methods, namely glycosylation, an azide-alkyne click reaction, photoinduced thiol-en addition, and sulfation. The interactions between compounds with six fucolectins of bacterial or fungal origin were tested using a hemagglutination inhibition assay. As a result, a tetravalent, α-l-fucose presenting glycocluster showed to be a ligand that was orders of magnitude better than a simple monosaccharide for tested lectins in most cases, which can nominate it as a universal ligand for studied lectins. This compound was also able to inhibit the adhesion of Pseudomonas aeruginosa cells to human epithelial bronchial cells. A trivalent fucocluster with a protected amine functional group also seems to be a promising candidate for designing glycoconjugates and chimeras.

Central European Institute of Technology Masaryk University Kamenice 5 625 00 Brno Czech Republic National Centre for Biomolecular Research Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

Central European Institute of Technology Masaryk University Kamenice 5 625 00 Brno Czech Republic National Centre for Biomolecular Research Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic Department of Biochemistry Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

Department of Biochemistry Faculty of Science Charles University Albertov 2030 128 40 Prague 2 Czech Republic

Department of Pharmaceutical Chemistry University of Debrecen Egyetem tér 1 H 4032 Debrecen Hungary

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