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Related Experiment Videos

Solvent interactions determine carbohydrate conformation.

K N Kirschner1, R J Woods

  • 1Complex Carbohydrate Research Center, University of Georgia, 220 Riverbend Road, Athens, GA 30606, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 30, 2001
PubMed
Summary

Solvent effects, specifically water, are crucial for understanding carbohydrate structure. Including explicit water in simulations accurately predicts the conformational preferences of (1-->6)-linked oligosaccharides, revealing the physical origin of their behavior.

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Area of Science:

  • Carbohydrate Chemistry
  • Computational Chemistry
  • Structural Biology

Background:

  • Oligosaccharide and polysaccharide 3D structures dictate biological functions.
  • Conformation depends on torsion angles (phi, psi, omega); omega-angle preferences differ between glucopyranosides (gauche) and galactopyranosides (anti).
  • The physical origin of these conformational preferences, particularly in (1-->6)-linked oligosaccharides, remains unclear, despite recognition of solvent dependence.

Purpose of the Study:

  • To elucidate the physical origin of conformational preferences in carbohydrates, specifically the omega-torsion angle.
  • To explain the solvent-dependent gauche effect observed in (1-->6)-linked oligosaccharides.
  • To accurately reproduce experimental rotamer distributions using computational methods.

Main Methods:

Related Experiment Videos

  • Quantum mechanics calculations.
  • Solvated molecular dynamics simulations on methyl alpha-D-glucopyranoside and methyl alpha-D-galactopyranoside.
  • Inclusion of explicit water molecules in simulations.

Main Results:

  • Experimental rotamer distributions for omega-angles were accurately reproduced only when explicit water was included in molecular dynamics simulations.
  • Water disrupts intramolecular hydrogen bonding within the carbohydrate structures.
  • This disruption allows internal electronic and steric repulsions between oxygen atoms to determine rotamer populations.

Conclusions:

  • Explicit water molecules are essential for accurately modeling the conformational behavior of (1-->6)-linked carbohydrates.
  • The solvent-mediated disruption of hydrogen bonds is key to understanding the gauche effect in these systems.
  • This study provides a quantitative explanation for the observed conformational preferences in (1-->6)-linked oligosaccharides.