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Modeling Ligands into Maps Derived from Electron Cryomicroscopy
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Glucose interactions with a model peptide.

Phillip E Mason1, Adrien Lerbret, Marie-Louise Saboungi

  • 1Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, USA.

Proteins
|May 17, 2011
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations show glucose is excluded from melittin surfaces. However, glucose weakly binds to melittin via hydrophobic interactions with tryptophan, differing between alpha and beta anomers.

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Biochemistry

Background:

  • Glucose acts as an osmolyte, influencing protein behavior in aqueous solutions.
  • Melittin, a helical polypeptide, serves as a model protein for studying solute-protein interactions.
  • Understanding solute-protein interactions is crucial for molecular biology and drug design.

Purpose of the Study:

  • To investigate the molecular interactions between D-glucopyranose anomers (alpha and beta) and the polypeptide melittin using molecular dynamics simulations.
  • To elucidate the mechanism of glucose exclusion from protein surfaces and identify specific binding interactions.
  • To quantify the binding affinity and characterize the binding modes of glucose to melittin.

Main Methods:

  • Performing molecular dynamics (MD) simulations of melittin in concentrated aqueous solutions of alpha and beta D-glucopyranose.
  • Analyzing simulation trajectories to assess glucose distribution around the melittin surface.
  • Calculating binding free energies and characterizing hydrogen bonding patterns and hydrophobic interactions.

Main Results:

  • Simulations confirmed preferential exclusion of glucose from melittin surfaces, consistent with its role as an osmolyte.
  • Glucose exhibited specific, albeit weak, binding to the tryptophan-19 side chain of melittin through hydrophobic face stacking.
  • Distinct binding interfaces were observed for alpha and beta glucose anomers due to differences in their hydroxyl group configurations.

Conclusions:

  • Glucose exclusion from melittin is influenced by limited hydrogen bonding with protein side chains.
  • Hydrophobic interactions between glucose and the tryptophan indole ring represent a specific, low-affinity binding mechanism.
  • The anomer-specific binding modes highlight the subtle structural determinants governing sugar-protein interactions.