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Related Experiment Videos

Hydration effects in protein unfolding

G I Makhatadze1, P L Privalov

  • 1Department of Biology, Johns Hopkins University, Baltimore, MD 21218.

Biophysical Chemistry
|August 1, 1994
PubMed
Summary

Protein unfolding involves hydration effects. While internal group interactions stabilize proteins, exposed polar and aromatic groups destabilize them upon unfolding.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Structural Biology

Background:

  • Protein structure is stabilized by internal interactions and hydration.
  • Understanding the energetic contributions of hydration is crucial for protein folding studies.

Purpose of the Study:

  • To calculate hydration enthalpies and entropies for protein unfolding.
  • To differentiate between internal group interactions and hydration effects on protein stability.

Main Methods:

  • Utilized 3D structures of native proteins and thermodynamic transfer data.
  • Modeled protein groups using low molecular compounds transferred from gas to water.
  • Applied calculations over a broad temperature range.

Main Results:

  • Hydration effects were excluded from calorimetric unfolding data.
  • Internal group interactions were estimated to stabilize the native state.
  • Exposed polar and aromatic groups destabilize the native state due to hydration, while aliphatic groups do not.

Conclusions:

  • Protein stability is a balance between internal enthalpic interactions and hydration effects.
  • Hydration of exposed polar and aromatic groups is a key factor in protein destabilization during unfolding.

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