Additive empirical force field for hexopyranose monosaccharides

Area of Science:

• Computational Chemistry
• Molecular Dynamics
• Biomolecular Modeling

Background:

• Accurate molecular simulations require robust force fields.
• Existing CHARMM force fields needed expansion to include hexopyranose monosaccharides.

Purpose of the Study:

• To develop an all-atom additive empirical force field for glucose and its diastereomers.
• To ensure consistency with existing CHARMM biomolecular force fields.

Main Methods:

• Hierarchical development of the force field using small-molecule model compounds.
• Parametrization based on vibrational frequencies, crystal geometries, and various condensed-phase properties.
• Validation against experimental data and high-level quantum mechanical calculations.

Main Results:

• The force field accurately reproduces gas-phase and condensed-phase properties of pyranose monosaccharides.
• Monosaccharide crystal unit cell dimensions, ring puckering, and aqueous solution properties are well-reproduced.
• The new parameter set enables simulations of heterogeneous systems including proteins, nucleic acids, lipids, and hexopyranose monosaccharides.

Conclusions:

• The developed force field provides a significant advancement for simulating complex biological systems containing carbohydrates.
• This model expands the applicability of CHARMM force fields to a wider range of biomolecular and chemical environments.
• Enables more accurate in silico investigations of carbohydrate-protein and other complex interactions.