The cation-independent mannose-6-phosphate/IGF2 receptor (CI-M6P/IGF2R) plays a crucial role in transporting lysosomal enzymes and other ligands. In this study, we designed and synthesized novel stable mannose-6-phosphate (M6P) derivatives to enhance their affinity for CI-M6P/IGF2R. To evaluate the binding potency, we employed a sensitive and cost-effective fluorescence polarization assay, enabling rapid quantification of receptor-ligand interactions in solution. The tested compounds included di-, tri-, and penta-M6P peptides along with various M6P-derived small molecules featuring phosphate isosteres or other functional modifications. Our findings indicate that ligands bearing multiple M6P moieties exhibit significantly higher receptor affinities than monomeric compounds and that phosphonate groups may serve as a more stable and potent alternative to native M6P. Computational modeling of ligand interactions with the CI-M6P/IGF2R domains further elucidated the binding mechanisms, offering new directions for the development of more effective ligands. This study advances the design of therapeutic strategies that leverage CI-M6P/IGF2R for targeted biomolecule delivery to lysosomes, thereby opening new possibilities for biomedical applications.

• Klíčová slova
• IGF2, Mannose‐6‐phosphate, fluorescence polarization assay, ligand binding, receptor,
• MeSH
• fluorescenční polarizace MeSH
• lidé MeSH
• ligandy MeSH
• lyzozomy metabolismus   MeSH
• mannosafosfáty * chemie   metabolismus   chemická syntéza   MeSH
• racionální návrh léčiv MeSH
• receptor IGF typ 2 * metabolismus   chemie   MeSH
• vazba proteinů MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• IGF2R protein, human MeSH Prohlížeč
• ligandy MeSH
• mannosafosfáty * MeSH
• mannose-6-phosphate MeSH Prohlížeč
• receptor IGF typ 2 * MeSH