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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Shielding effect in protein folding.

Adam K Sieradzan1, Agnieszka G Lipska1, Emilia A Lubecka2

  • 1Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.

Journal of Molecular Graphics & Modelling
|November 22, 2017
PubMed
Summary

This study introduces a new shielding effect to improve protein folding simulations. Incorporating this into the UNRES force field significantly accelerates protein folding kinetics and alters behavior.

Keywords:
Local interactionsPhysicochemical propertiesPotentials of mean forceProteinsUNRES force field

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Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Dynamics

Background:

  • Hydrogen bonds between peptide groups are crucial for protein folding and stability.
  • Water molecules compete with peptide groups for hydrogen bond formation, influencing protein structure.
  • Side-chain interactions, known as the shielding effect, reduce peptide group hydration and promote protein folding.

Purpose of the Study:

  • To present a novel approach for incorporating the shielding effect into protein folding simulations.
  • To modify the energy function within the UNRES (UNited RESidue) force field to account for the shielding effect.
  • To investigate the impact of the shielding effect on protein structure, folding kinetics, and free energy landscapes.

Main Methods:

  • Derivation of a modified energy function including the shielding effect.
  • Integration of the modified energy function into the UNRES force field.
  • Application of Canonical Molecular Dynamics and Replica Exchange Molecular Dynamics simulations using the modified UNRES force field.

Main Results:

  • The modified UNRES force field demonstrates altered behavior compared to previous versions.
  • Even a minor contribution of the shielding effect significantly impacts the energy function.
  • The simulations show a significant acceleration of the protein folding process.

Conclusions:

  • The shielding effect plays a critical role in modulating protein folding dynamics.
  • The modified UNRES force field provides a more accurate representation of protein folding.
  • This approach offers a promising avenue for enhancing the efficiency and accuracy of molecular dynamics simulations in protein science.