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A molecular dynamics simulation of crystalline alpha-cyclodextrin hexahydrate
J E Koehler1, W Saenger, W F van Gunsteren
1Institut für Kristallographie, Freie Universität Berlin, Germany.
European Biophysics Journal : EBJ
|January 1, 1987
Summary
This study validates a computational force field for molecular dynamics simulations. The GROMOS program accurately reproduced the crystal structure of alpha-cyclodextrin (alpha-CD) hexahydrate, confirming its reliability for biomolecular modeling.
Area of Science:
- Crystallography
- Computational Chemistry
- Biomolecular Simulation
Background:
- The precise atomic structure of crystalline alpha-cyclodextrin (alpha-CD) hexahydrate is well-established through X-ray and neutron diffraction.
- Availability of all hydrogen atom positions allows for rigorous testing of computational models.
Purpose of the Study:
- To evaluate the accuracy of an empirical force field used in protein and nucleic acid simulations.
- To assess the reliability of the GROMOS program package for biomolecular modeling.
Main Methods:
- Molecular dynamics simulations were performed on a system of alpha-cyclodextrin hexahydrate using the GROMOS program.
- The simulated crystal structure was compared against experimentally determined data from diffraction analyses.
Main Results:
- Simulated alpha-CD atom positions closely matched experimental data (within 0.025 nm vs. 0.036 nm accuracy).
- Water molecule positions in the simulation were largely consistent with experimental findings (two-thirds within experimental accuracy).
- A strong correlation was observed between simulated and experimental hydrogen bond patterns.
Conclusions:
- The tested empirical force field demonstrates high reliability for simulating crystalline carbohydrate structures.
- The GROMOS program package is suitable for accurate biomolecular modeling, including carbohydrates and their hydration.
- This validation supports the use of the force field in broader protein and nucleic acid simulations.