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Improved Angle Potentials for Coarse-Grained Molecular Dynamics Simulations.

Monica Bulacu¹, Nicolae Goga^1,2, Wei Zhao³

¹Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 7, 9747 AG Groningen, The Netherlands.

Journal of Chemical Theory and Computation

|November 20, 2015

Summary

This summary is machine-generated.

New coarse-grained potentials improve molecular dynamics simulations by enhancing stability and accuracy for flexible molecules. These methods address numerical instabilities in torsion angle calculations, leading to more reliable modeling of polymers and polypeptides.

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Area of Science:

Computational Chemistry
Materials Science
Biophysics

Background:

Traditional atomistic potentials are often unsuitable for coarse-grained molecular dynamics (CGMD).
Numerical instabilities arise in CGMD simulations of flexible molecules, particularly with standard torsion angle potentials.
Existing coarse-grained force fields may not accurately capture the behavior of polymers and polypeptides.

Purpose of the Study:

To develop novel coarse-grained potentials that improve the stability and accuracy of molecular dynamics simulations.
To address numerical instabilities encountered in traditional torsion angle calculations for flexible systems.
To provide more reliable simulation methods for polymers like polyethylene glycol (PEG) and polystyrene (PS), and for polypeptides.

Main Methods:

Introduction of two new angle potential forms: restricted bending (ReB) and combined bending-torsion (CBT).
Development of the dummy-assisted dihedral (DAD) approach, utilizing virtual beads to modify torsion potentials.
Implementation of these potentials in an in-house version of the Gromacs package.

Main Results:

The ReB potential prevents torsion angles from accessing unstable or unphysical configurations.
The CBT potential ensures smooth interactions even when unphysical configurations are sampled.
The DAD approach geometrically excludes unstable regions from the conformational space, enhancing stability.
Demonstrated benefits in simulations of polyethylene glycol (PEG), polystyrene (PS), and polypeptide molecules using the MARTINI force field.

Conclusions:

The proposed ReB, CBT, and DAD potentials significantly enhance the stability and accuracy of coarse-grained molecular dynamics simulations.
These new potentials offer improved modeling capabilities for flexible molecules, polymers, and polypeptides.
The publicly available implementation facilitates broader application in computational studies.