Exploring Biomolecular Conformational Dynamics with Polarizable Force Field AMOEBA and Enhanced Sampling Method...

Area of Science:

• Computational Chemistry
• Biophysics
• Molecular Dynamics

Background:

• Biomolecular behavior is governed by conformational dynamics.
• Polarizable force fields like AMOEBA accurately model electrostatic interactions.
• Standard molecular dynamics (MD) simulations with polarizable force fields are computationally intensive for long timescales.

Purpose of the Study:

• To develop a computationally efficient method for studying long-timescale biomolecular conformational dynamics.
• To integrate the AMOEBA polarizable force field with the Milestoning enhanced sampling technique.
• To accurately quantify thermodynamic and kinetic properties of biomolecules.

Main Methods:

• Integration of the AMOEBA polarizable force field with the Milestoning enhanced sampling method.
• Utilizing numerous short, independent MD trajectories to sample rare conformational states.
• Application to alanine dipeptide, DNA, and RNA A-B form conversion.

Main Results:

• Achieved well-converged thermodynamic and kinetic properties.
• Successfully quantified free energy differences, mean first passage times, and critical state transitions.
• Demonstrated efficient sampling of important conformational states.

Conclusions:

• The integration of polarizable force fields with enhanced sampling methods is powerful for biomolecular simulations.
• This approach enables accurate quantification of thermodynamic and kinetic properties at the atomic level.
• The developed method overcomes computational limitations of traditional MD for long-timescale dynamics.