Accelerated molecular dynamics simulations of protein folding

Area of Science:

• Biophysics
• Computational Biology
• Structural Biology

Background:

• Protein folding is crucial for biological function.
• Accurate simulation of protein folding remains a computational challenge.
• Accelerated molecular dynamics (aMD) offers a potential solution for faster simulations.

Purpose of the Study:

• To evaluate the accuracy and efficiency of aMD in simulating the folding of four fast-folding proteins.
• To compare aMD results with conventional molecular dynamics (cMD) simulations.
• To provide insights into protein folding pathways and conformational states.

Main Methods:

• Simulations of chignolin, Trp-cage, villin headpiece, and WW domain using aMD.
• Comparison with hundred-of-microsecond timescale cMD simulations.
• Free energy profile calculations using cumulant expansion to the second-order reweighting.
• Analysis of protein secondary structures and residue interactions.

Main Results:

• aMD captured complete protein folding in significantly shorter simulation times than cMD.
• Folded conformations were within 0.2-2.1 Å of native structures.
• Free energy profiles from aMD agreed well with cMD, identifying distinct conformational states and energy barriers.
• Insights into protein folding pathways were obtained through detailed structural analysis.

Conclusions:

• aMD is a useful and accurate method for studying protein folding.
• aMD significantly reduces simulation time while maintaining accuracy.
• This study provides a reference for future aMD-based protein folding research.