Gaussian-Accelerated Molecular Dynamics with the Weighted Ensemble Method: A Hybrid Method Improves Thermodynamic and...

Area of Science:

• Computational chemistry
• Molecular dynamics simulations

Background:

• Gaussian-accelerated molecular dynamics (GaMD) enhances sampling by smoothing potential energy landscapes.
• GaMD does not directly provide time-dependent kinetic properties.
• Weighted ensemble (WE) method efficiently samples transitions and yields rates but struggles with equilibrium convergence.

Purpose of the Study:

• To develop a hybrid method combining GaMD and WE for improved molecular dynamics simulations.
• To accurately and efficiently sample both thermodynamic and kinetic properties.

Main Methods:

• A hybrid approach integrating GaMD and WE was developed.
• GaMD was initially employed to sample the system's potential energy landscape.
• WE was subsequently used for further sampling and kinetic property analysis.

Main Results:

• The hybrid method demonstrated enhanced sampling capabilities.
• Both thermodynamic and kinetic properties were sampled more accurately and rapidly.
• The combined approach outperformed GaMD or WE used individually.

Conclusions:

• The hybrid GaMD-WE method offers a superior strategy for molecular dynamics simulations.
• This method accelerates the accurate determination of thermodynamic and kinetic properties.
• It addresses limitations of individual GaMD and WE techniques.