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Measurement of Maximum Isometric Force Generated by Permeabilized Skeletal Muscle Fibers
11:30

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Published on: June 16, 2015

Protein high-force pulling simulations yield low-force results.

Seth Lichter1, Benjamin Rafferty, Zachary Flohr

  • 1Department of Mechanical Engineering, Northwestern University, Evanston, Illinois, United States of America. s-lichter@northwestern.edu

Plos One
|April 25, 2012
PubMed
Summary
This summary is machine-generated.

High forces applied to proteins reveal two unfolding regimes. Protein structures surprisingly resist unfolding at extreme forces, suggesting inherent resilience to transient mechanical stress.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Dynamics

Background:

  • Understanding protein mechanical stability is crucial for molecular biology.
  • Simulating protein unfolding under force provides insights into structural resilience.

Purpose of the Study:

  • To investigate protein unfolding dynamics under extreme forces using molecular dynamics simulations.
  • To characterize the force-dependent regimes of protein unfolding and identify key structural behaviors.

Main Methods:

  • All-atom explicit-solvent molecular dynamics simulations.
  • Constant force pulling simulations (750-3000 pN) on three small proteins.
  • Introduction of a nondimensional timescale for cross-force comparisons.

Main Results:

  • A crossover force (~1100 pN) divides unfolding into two distinct regimes.
  • High forces lead to sequential residue unfolding, while lower forces show intermediate states and cooperative unfolding.
  • Secondary structure (alpha-helix, beta-sheet) unfolding is force-insensitive.

Conclusions:

  • Proteins exhibit remarkable force-insensitivity in key unfolding aspects, suggesting inherent resistance to transient high forces.
  • High-force simulations can be accelerated while preserving critical unfolding features.
  • Findings inform protein design for enhanced mechanical stability.