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Protein folding kinetics under force from molecular simulation.

Robert B Best1, Gerhard Hummer

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

Journal of the American Chemical Society
|March 1, 2008
PubMed
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Protein refolding under stretching force is slow because the unfolded state dominates kinetics. Simulations reveal how force affects protein folding barriers, suggesting experimental refolding possibilities at higher forces.

Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Dynamics

Background:

  • Mechanical unfolding of proteins is widely studied.
  • Protein refolding under stretching force remains challenging.
  • Understanding force-induced folding is crucial for protein engineering.

Purpose of the Study:

  • To investigate protein refolding kinetics under applied force.
  • To model the effects of mechanical force on protein folding pathways.
  • To identify key factors governing refolding under tension.

Main Methods:

  • Simulations of a coarse-grained ubiquitin model.
  • Analysis of refolding kinetics under varying pulling forces.
  • Application of one-dimensional Kramers theory for barrier analysis.

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Main Results:

  • Force effects on folding kinetics are described by Kramers theory.
  • Physically meaningful parameters for the folding activation barrier were obtained.
  • The unfolded protein state significantly influences refolding kinetics.

Conclusions:

  • Refolding slows considerably at moderate pulling forces due to the unfolded state.
  • Simulation parameters offer insights into experimental refolding observations.
  • Higher forces may enable practical observation of protein refolding.