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Related Experiment Videos

Oligosaccharide-protein interactions: a three-dimensional view.

J P Carver1, S W Michnick, A Imberty

  • 1Department of Medical Genetics, University of Toronto, Ontario, Canada.

Ciba Foundation Symposium
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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Cellular recognition relies on carbohydrate-binding proteins called lectins. This study reveals that oligosaccharide flexibility and its loss upon binding to lectins are key to understanding cellular recognition specificity.

Area of Science:

  • Carbohydrate Chemistry
  • Structural Biology
  • Biochemistry

Background:

  • Cellular functions depend on the specific recognition of carbohydrate structures.
  • Proteins, particularly lectins, are the primary receptors for these carbohydrate recognition events.
  • Plant lectins serve as model systems for studying the molecular basis of oligosaccharide-protein interactions.

Purpose of the Study:

  • To investigate the molecular basis of specificity in oligosaccharide-protein interactions.
  • To elucidate the role of oligosaccharide conformational flexibility in binding.
  • To explain the high affinity of glycoprotein-receptor interactions.

Main Methods:

  • Quantitative analysis of nuclear magnetic resonance (NMR) measurements to assess oligosaccharide conformational flexibility.

Related Experiment Videos

  • Comparison of measured and calculated entropy barriers for oligosaccharide binding.
  • X-ray crystallography to support findings on conformational changes upon binding.

    • Main Results:

    • Oligosaccharides exhibit significant conformational flexibility, as evidenced by NMR data.
    • The entropy barrier to oligosaccharide binding arises from the loss of this conformational flexibility upon lectin interaction.
    • High-affinity interactions of glycoproteins with receptors can be attributed to multivalency or the fixation of specific oligosaccharide conformations.

    Conclusions:

    • Conformational flexibility of oligosaccharides is a critical factor in their recognition by proteins.
    • The binding of lectins restricts oligosaccharide flexibility, contributing to specificity and affinity.
    • Understanding these interactions is crucial for deciphering cellular recognition processes and glycoprotein functions.