A GROMOS Force Field for Furanose-Based Carbohydrates

Area of Science:

• Computational Chemistry
• Biophysics
• Carbohydrate Chemistry

Background:

• Molecular dynamics (MD) simulations are crucial for understanding carbohydrate behavior.
• Existing force fields often lack comprehensive parameters for furanose sugars.
• Accurate modeling of furanose conformational dynamics is essential for biological studies.

Purpose of the Study:

• To develop and validate a GROMOS united-atom force field parameter set for furanose carbohydrates.
• To enable accurate MD simulations of furanose-containing molecules in aqueous environments.
• To extend the applicability of GROMOS carbohydrate force fields to include furanose units.

Main Methods:

• Development of a novel united-atom force field parameter set for GROMOS.
• Validation using quantum-mechanical calculations and experimental data.
• Conformational analysis of furanose mono-, di-, oligo-, and polymers.

Main Results:

• The new parameter set accurately reproduces furanose ring conformational equilibrium.
• It correctly predicts relative free energies of anomers and hydroxymethyl rotamers.
• The set allows for arbitrary glycosidic linkage and anomeric configurations.

Conclusions:

• The developed GROMOS force field parameters provide a robust tool for simulating furanose carbohydrates.
• This advancement facilitates the study of complex biological systems containing both furanose and pyranose units.
• The validated set improves the accuracy of molecular dynamics simulations for diverse saccharides.