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Related Experiment Videos

Oligosaccharides implicated in recognition are predicted to have relatively ordered structures.

Andrew Almond1, Bent O Petersen, Jens Ø Duus

  • 1Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom. Andrew.Almond@bioch.ox.ac.uk

Biochemistry
|May 12, 2004
PubMed
Summary

Fucosylated glycans exhibit restricted movement in water, stabilized by hydrogen bonds. This ordered structure is key to their protein interactions and recognition functions.

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Area of Science:

  • Carbohydrate Chemistry
  • Structural Biology
  • Computational Chemistry

Background:

  • Fucosylated O- and N-linked glycans are vital for biological recognition.
  • Understanding their structure-function relationship requires detailed dynamic analysis, which is currently limited.

Purpose of the Study:

  • To investigate the three-dimensional structure and dynamics of fucosylated oligosaccharides.
  • To elucidate the role of water and hydrogen bonding in stabilizing glycan conformations.

Main Methods:

  • High-field (800 MHz) nuclear magnetic resonance (NMR) spectroscopy.
  • Long-timescale (50 ns) molecular dynamics (MD) simulations in explicit water.
  • Analysis of nuclear Overhauser effects and residual dipolar couplings.

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Main Results:

  • MD simulations accurately predicted NMR data, validating the computational approach.
  • Fucosylated oligosaccharides adopt restricted conformations, librating around a single average structure.
  • Water molecules stabilize intramolecular hydrogen bonds, maintaining ordered glycan conformations.

Conclusions:

  • Fucosylated glycans possess inherently ordered structures due to water-mediated interactions.
  • This conformational restriction is critical for their function as recognition molecules interacting with proteins.