Pseudomonas aeruginosa is a prevalent opportunistic human pathogen, particularly associated with cystic fibrosis. Among its virulence factors are the LecA and LecB lectins. Both lectins play an important role in the adhesion to the host cells and display cytotoxic activity. In this study, we successfully synthesized hardly hydrolysable carbohydrate ligands targeting these pathogenic lectins, including two bispecific glycans. The interactions between LecA/LecB lectins and synthetic glycans were evaluated using hemagglutination (yeast agglutination) inhibition assays, comparing their efficacy with corresponding monosaccharides. Additionally, the binding affinities of bispecific glycans were assessed using isothermal titration calorimetry (ITC). Structural insight into the lectin-ligand interaction was obtained by determining the crystal structures of LecA/LecB lectins in complex with one of the bispecific ligands using X ray crystallography. This comprehensive investigation into the inhibitory potential of synthetic glycosides against P. aeruginosa lectins sheds light on their potential application in antimicrobial therapy.

Central European Institute of Technology Masaryk University Kamenice 5 625 00 Brno Czech Republic

Department of Biochemistry Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

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

HUN REN UD Pharmamodul Research Group Egyetem tér 1 4032 Debrecen Hungary

National Centre for Biomolecular Research Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

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