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Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry
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The effect of temperature on single-polypeptide adsorption.

Sandra Kienle1, Susanne Liese, Nadine Schwierz

  • 1Department of Physics (E22), IMETUM, CeNS, Technische Universität München, Boltzmannstr. 11, 85748 Garching, Germany.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|February 1, 2012
PubMed
Summary

Hydrophobic attraction (HA) drives protein folding. New experiments and simulations reveal HA

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Computational Biology

Background:

  • Hydrophobic attraction (HA) is a key factor in protein folding.
  • Understanding HA's temperature dependence is crucial for protein folding insights.
  • Previous studies focused on small hydrophobic particle solvation.

Purpose of the Study:

  • Investigate the temperature dependence of HA.
  • Determine free-energy change and detachment length for polypeptide desorption.
  • Complement existing research on hydrophobic solvation.

Main Methods:

  • Combined experimental and simulation approach.
  • Atomic force microscopy (AFM) for single-molecule desorption experiments.
  • Molecular dynamics (MD) simulations.

Main Results:

  • Weak temperature dependence of free-energy change for polypeptide desorption.
  • Observed maxima or minima in temperature-dependent free energy, varying with substrate.
  • Contrasting results compared to small hydrophobic particle solvation.
  • Rationalized findings through a compensation mechanism of desorption forces.

Conclusions:

  • Polypeptide desorption exhibits a weak temperature dependence, unlike small hydrophobic particles.
  • A compensation mechanism influences the free energy change.
  • Highlights differences between protein folding and adsorption temperature dependencies.
  • Enables study of equilibrium and non-equilibrium processes driven by HA.