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Related Experiment Videos

Proteins in a shear flow.

P Szymczak1, Marek Cieplak

  • 1Institute of Theoretical Physics, Warsaw University, ul. Hoza 69, 00-681 Warsaw, Poland. piotrek@fuw.edu.pl

The Journal of Chemical Physics
|October 24, 2007
PubMed
Summary
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Single protein unfolding in shear flow reveals distinct intermediate states, unlike smooth homopolymer unraveling. Hydrodynamic interactions and anchoring points significantly influence this complex process.

Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Dynamics

Background:

  • Understanding protein conformational changes under external forces is crucial for molecular biology.
  • Shear flow is a relevant physical condition encountered in biological systems and industrial processes.
  • Previous studies on homopolymers showed smooth unraveling, but protein-specific behavior remained less understood.

Purpose of the Study:

  • To investigate the conformational dynamics and unfolding mechanisms of single protein molecules subjected to shear flow.
  • To elucidate the role of protein structure, hydrodynamic interactions, and anchoring in shear-induced unfolding.
  • To compare the unfolding patterns of globular proteins with those of homopolymers.

Main Methods:

  • Brownian dynamics simulations were employed to model protein behavior.

Related Experiment Videos

  • A structure-based coarse-grained model was utilized for representing protein molecules.
  • Simulations were performed on two specific proteins: ubiquitin and integrin.

    • Main Results:

    • Proteins like ubiquitin and integrin exhibit unfolding through a series of metastable states at moderate shear rates, differing from homopolymer behavior.
    • Complete unfolding requires very high shear rates.
    • Hydrodynamic interactions between amino acids were found to impede the unfolding process.
    • The unfolding pathway is sensitive to whether the protein is anchored and the specific anchoring site.

    Conclusions:

    • Single protein unfolding in shear flow is a complex, multi-state process distinct from simple polymer unraveling.
    • Protein structure and interactions play a critical role in determining the response to shear forces.
    • Anchoring conditions significantly modulate protein conformational dynamics under flow, offering insights into protein stability and function in dynamic environments.