Force field bias in protein folding simulations.

Area of Science:

• Computational biology
• Biophysics
• Protein dynamics

Background:

• Molecular dynamics (MD) simulations are crucial for studying protein folding at the atomic level.
• Distinguishing between force field deficiencies and insufficient simulation time is a common challenge in MD studies of protein folding.

Purpose of the Study:

• To investigate the cause of failed folding simulations for the human Pin1 WW domain.
• To assess the reliability of the force field used in long timescale MD simulations.

Main Methods:

• Utilized the deactivated morphing method to compute free energy differences.
• Calculated free energy differences between misfolded and folded states of the Pin1 WW domain.

Main Results:

• The employed force field was found to favor misfolded states over the native folded state.
• This force field bias explains the observed failure of the protein folding simulations.

Conclusions:

• The deactivated morphing method can identify force field limitations in MD simulations.
• Findings highlight the importance of force field validation for accurate protein folding prediction.