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Related Experiment Videos

An improved OPLS-AA force field for carbohydrates.

D Kony1, W Damm, S Stoll

  • 1CABE, Department of Inorganic, Analytical and Applied Chemistry, Science II, University of Geneva, 30 Quai E. Ansermet, CH-1211 Geneva 4, Switzerland.

Journal of Computational Chemistry
|October 9, 2002
PubMed
Summary

This study introduces an improved OPLS-all atom (OPLS-AA) force field for carbohydrates, OPLS-AA-SEI, by adjusting electrostatic interactions. This new model enhances conformational accuracy and improves molecular dynamics simulations for sugars.

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Carbohydrate Chemistry

Background:

  • The OPLS-all atom (OPLS-AA) force field is widely used for molecular simulations.
  • Existing OPLS-AA force fields exhibit limitations in accurately describing carbohydrate conformations.
  • Accurate force fields are crucial for understanding carbohydrate behavior in biological systems.

Purpose of the Study:

  • To develop an improved version of the OPLS-AA force field for carbohydrates, termed OPLS-AA-SEI.
  • To enhance the accuracy of conformational energetics and molecular dynamics simulations for carbohydrates.
  • To address limitations in sampling and conformational behavior observed in previous models.

Main Methods:

  • Introduced additional scaling factors for 1,5- and 1,6-electrostatic interactions.

Related Experiment Videos

  • Tested the new model on 1,2-ethanediol and a series of hexopyranoses (D-glucose, D-mannose, D-galactose).
  • Performed torsional parameter fitting and 10-ns molecular dynamics (MD) simulations.

    • Main Results:

    • The OPLS-AA-SEI force field shows excellent agreement with ab initio data for conformational energies.
    • Reduced overly high energy barriers, leading to improved conformational sampling in simulations.
    • MD simulations of alpha-D-glucose and alpha-D-galactose yield results in good agreement with experimental data.

    Conclusions:

    • The OPLS-AA-SEI force field significantly improves the accuracy of carbohydrate simulations compared to OPLS-AA.
    • This enhanced model allows for more realistic conformational behavior and better sampling of hydroxyl groups.
    • The OPLS-AA-SEI force field is suitable for simulating larger carbohydrates and polysaccharides.