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A self-assembled multivalent pseudopolyrotaxane for binding galectin-1.

Alshakim Nelson1, Jason M Belitsky, Sébastien Vidal

  • 1California NanoSystems Institute, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.

Journal of the American Chemical Society
|September 24, 2004
PubMed
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A novel pseudopolyrotaxane, a dynamic molecular structure, effectively inhibits T-cell agglutination by enhancing interactions between lactoside ligands and galectin-1. This supramolecular design offers superior performance compared to other glycoconjugates in protein-carbohydrate binding studies.

Area of Science:

  • Supramolecular Chemistry
  • Glycobiology
  • Materials Science

Background:

  • Galectin-1 mediates T-cell agglutination through protein-carbohydrate interactions.
  • Cyclodextrins (CDs) functionalized with lactoside ligands are used to study these interactions.
  • Dynamic presentation of ligands is crucial for optimizing binding affinity.

Purpose of the Study:

  • To investigate a self-assembled pseudopolyrotaxane as an inhibitor of galectin-1-mediated T-cell agglutination.
  • To evaluate the impact of dynamic ligand presentation on binding affinity.
  • To compare the efficacy of the pseudopolyrotaxane with other lactoside-bearing glycoconjugates.

Main Methods:

  • Synthesis of a pseudopolyrotaxane with cyclodextrin "beads" on a polyviologen "string", displaying lactoside ligands.

Related Experiment Videos

  • Assessment of T-cell agglutination inhibition using the pseudopolyrotaxane in an in vitro assay.
  • Comparison with lactoside-bearing trivalent glycoclusters and chitosan polymers.

    • Main Results:

    • The pseudopolyrotaxane demonstrated a dynamic presentation of lactoside ligands, allowing adaptation to galectin-1 binding sites.
    • A valency-corrected 10-fold enhancement in agglutination inhibition was observed compared to native lactose.
    • The pseudopolyrotaxane outperformed trivalent glycoclusters and chitosan polymers in the assay.

    Conclusions:

    • Supramolecular architectures like pseudopolyrotaxanes offer a powerful platform for studying protein-carbohydrate interactions.
    • The dynamic nature of the pseudopolyrotaxane significantly enhances ligand presentation and binding efficacy.
    • This approach provides a novel strategy for developing potent inhibitors of galectin-1 activity.