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Related Experiment Videos

Rate-dependent force-extension models for single-molecule force spectroscopy experiments.

Manon Benedito1, Fabio Manca2,3, Pier Luca Palla1

  • 1Institute of Electronics, Microelectronics and Nanotechnology, UMR 8520, Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, LIA LICS/LEMAC, 59000 Lille, France.

Physical Biology
|May 29, 2020
PubMed
Summary

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We developed two Langevin-based models to study protein unfolding dynamics using atomic force microscopy. Our models accurately predict protein unfolding responses across various pulling rates, validated by titin and filamin experimental data.

Area of Science:

  • Biophysics
  • Statistical Mechanics
  • Macromolecular Dynamics

Background:

  • Single-molecule force spectroscopy (SMFS) measures macromolecular properties.
  • Atomic force microscopy (AFM) with variable pulling rates reveals protein folding/unfolding dynamics.

Purpose of the Study:

  • To propose two models for out-of-equilibrium statistical mechanics of bistable units representing protein domains.
  • To investigate the impact of pulling rate and device elasticity on protein unfolding response.

Main Methods:

  • Development of two Langevin-based models for protein domain bistability.
  • Theoretical analysis (analytical and numerical) of chain unfolding.
  • Comparison of model predictions with experimental AFM data.

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Main Results:

  • Models successfully describe the statistical mechanics of protein unfolding.
  • Investigated effects of pulling rate and instrument elasticity on unfolding.
  • Achieved good agreement between theoretical results and experimental data for titin and filamin.

Conclusions:

  • The proposed models provide a robust framework for analyzing protein unfolding dynamics.
  • The findings enhance understanding of how pulling rate and experimental setup influence macromolecular behavior.
  • Validated models offer predictive power for SMFS experiments.