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Related Experiment Video

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Sensing the anomeric effect in a solvent-free environment.

Emilio J Cocinero1, Pierre Carçabal, Timothy D Vaden

  • 1Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ UK.

Nature
|January 7, 2011
PubMed
Summary

The anomeric effect stabilizes sugar rings, but its origin is unclear. New research shows peptide interactions reveal the exo-anomeric effect dominates over the endo-anomeric effect in isolated sugars.

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Area of Science:

  • Carbohydrate Chemistry
  • Stereochemistry
  • Physical Organic Chemistry

Background:

  • The anomeric effect is a key stereoelectronic phenomenon influencing carbohydrate structure and biological molecules.
  • It involves stabilization of six-membered rings with electronegative C1 substituents via endo- or exo-anomeric interactions.
  • The precise physical origin of the anomeric effect remains incompletely understood.

Purpose of the Study:

  • To investigate the physical origins of the anomeric effect in an isolated system.
  • To differentiate the contributions of exo- and endo-anomeric interactions.
  • To elucidate the role of peptide interactions in modulating the anomeric effect.

Main Methods:

  • Gas-phase laser spectroscopy was employed to study isolated sugar anomers.
  • Computational analysis, including Natural Bond Orbital calculations, was performed.
  • Truncated peptide motifs were used to interact with d-galactose anomers.

Main Results:

  • Peptide complexes with α- and β-d-galactose anomers showed similar structures but differing interaction polarizations.
  • Computational analysis confirmed the experimental observations.
  • The results indicated a dominance of the exo-anomeric effect over the endo-anomeric effect.

Conclusions:

  • The study provides new insights into the physical origins of the anomeric effect.
  • The dominance of the exo-anomeric effect was demonstrated in isolated sugar-peptide complexes.
  • Re-evaluation of the influence of C2 substituents on carbohydrate anomeric effects and biological activity is suggested.