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Synthesis of Multivalent Carbohydrate‐Centered Glycoclusters as Nanomolar Ligands of the Bacterial Lectin LecA from Pseudomonas aeruginosa |
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| Authors: | Dr Marina L Gening Dr Denis V Titov Dr Samy Cecioni Dr Aymeric Audfray Dr Alexey G Gerbst Dr Yury E Tsvetkov Dr Vadim B Krylov Dr Anne Imberty Prof Nikolay E Nifantiev Dr Sébastien Vidal |
| Institution: | 1. Laboratory of Glycoconjugate Chemistry, N.?D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect 47, 119991 Moscow (Russia), Fax: (+7)?499‐1358784;2. Centre de Recherche sur les Macromolécules Végétales (CERMAV–CNRS UPR 5301), affiliated with Grenoble Université and ICMG, BP 53, 38041 Grenoble (France), Fax: (+33)?476‐037‐636;3. Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Laboratoire de Chimie Organique 2–Glycochimie, UMR 5246, CNRS, Université Claude Bernard Lyon 1, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne (France), Fax: (+33)?472‐448‐109 |
| Abstract: | A family of fifteen glycoclusters based on a cyclic oligo‐(1→6)‐β‐D ‐glucosamine core has been designed as potential inhibitors of the bacterial lectin LecA with various valencies (from 2 to 4) and linkers. Evaluation of their binding properties towards LecA has been performed by a combination of hemagglutination inhibition assays (HIA), enzyme‐linked lectin assays (ELLA), and isothermal titration microcalorimetry (ITC). Divalent ligands displayed dissociation constants in the sub‐micromolar range and tetravalent ligands displayed low nanomolar affinities for this lectin. The influence of the linker could also be demonstrated; aromatic moieties are the best scaffolds for binding to the lectin. The affinities observed in vitro were then correlated with molecular models to rationalize the possible binding modes of these glycoclusters with the bacterial lectin. |
| Keywords: | click chemistry glucosamines glycocluster lectins Pseudomonas aeruginosa oligosaccharides |