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Probing sulfatide-tissue lectin recognition with functionalized glycodendrimersomes.

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  • 1CÚRAM - SFI Research Centre for Medical Devices and the School of Chemistry, National University of Ireland Galway, University Road, Galway H91 TK33, Ireland.

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Area of Science:

  • Biochemistry
  • Glycobiology
  • Cell Biology

Background:

  • Sulfatides are abundant glycosphingolipids with a small 3-O-sulfated galactose head group.
  • Their role in cellular functions, particularly in relation to tissue lectins and the 'sugar code', remains incompletely understood.

Purpose of the Study:

  • To investigate the molecular mechanisms of sulfatide recognition by tissue lectins.
  • To explore the functional implications of sulfatide-lectin interactions in stabilizing membrane microdomains and cell surface interactions.

Main Methods:

  • Synthesis of sulfatide head group derivatives for functionalization of amphiphilic dendrimers.
  • Creation and aggregation studies of biomimetic vesicles, alone or with lactose, in the presence of tissue lectins.
  • Structural analysis of sulfatide-lectin binding interactions.

Main Results:

  • Demonstrated bridging of sulfatide-containing vesicles by galectin-4, indicating lectin involvement in glycan interactions.
  • Showed that galectin-8 recognizes sulfatides via the sphingosine's OH group, substituting for the glucose 3'-hydroxyl.
  • Highlighted the importance of heterobivalency and linker length in these interactions.

Conclusions:

  • Sulfatide recognition by lectins is crucial for stabilizing glycolipid-rich membrane microdomains and associating them with glycoproteins.
  • These findings provide insights into the functional roles of small glycan determinants on cell membranes.
  • Establishes a model for studying complex glycans and programming cell surface interactions.