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Accelerated Molecular Dynamics Simulation for Helical Proteins Folding in Explicit Water.

Lili Duan¹, Xiaona Guo¹, Yalong Cong²

¹School of Physics and Electronics, Shandong Normal University, Jinan, China.

Frontiers in Chemistry

|August 27, 2019

Summary

Accelerated molecular dynamics (AMD) efficiently folds eight helical proteins at room temperature, outperforming traditional molecular dynamics (MD) in speed and reliability for protein folding studies.

Keywords:

accelerated molecular dynamics simulation explicit water free energy landscape helical protein protein folding

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Area of Science:

Computational biology
Biophysics
Molecular dynamics simulations

Background:

Protein folding is crucial for biological function.
Traditional molecular dynamics (MD) can be computationally expensive for observing folding events.
Accelerated molecular dynamics (AMD) offers a potential solution for faster simulations.

Purpose of the Study:

To evaluate the efficiency and reliability of AMD for protein folding.
To compare AMD with traditional MD in simulating the folding of eight helical proteins.
To determine optimal simulation temperatures for protein folding.

Main Methods:

Simulated folding of eight helical proteins (2I9M, TC5B, 1WN8, 1V4Z, 1HO2, 1HLL, 2KFE, 1YYB) using AMD and MD.
Employed the AMBER14SB force field with an explicit solvent model.
Analyzed folding using RMSD, native contacts, cluster analysis, and free energy landscapes at various temperatures (300K, 350K, 400K, 450K).

Main Results:

AMD successfully and consistently folded all eight proteins into their native structures at 300K within 40-180 ns.
Traditional MD simulations did not achieve stable folded structures under similar conditions.
AMD demonstrated higher simulation efficiency than MD across all tested temperatures.
300K was identified as the most suitable temperature for protein folding across all systems.
AMD simulations were reproducible, yielding correct folded structures with different random seeds.

Conclusions:

AMD is a highly efficient and reliable method for studying protein folding.
AMD significantly accelerates the observation of protein folding events compared to traditional MD.
Room temperature (300K) is optimal for observing the folding of these helical proteins using AMD.