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Interfacial water structure controls protein conformation.

A Dér1, L Kelemen, L Fábián

  • 1Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences (MTA-SzBK), Pf. 521, H-6701 Szeged, Hungary. derandra@brc.hu

The Journal of Physical Chemistry. B
|April 27, 2007
PubMed
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A new theory explains how salts influence protein behavior (Hofmeister phenomena) by altering protein-water interfaces. This framework clarifies both stabilizing and destabilizing effects, resolving long-standing puzzles in protein science.

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Protein Science

Background:

  • The Hofmeister series describes how different salts affect protein solubility and stability.
  • Previous models have not fully explained the diverse effects of salts on protein structure and function.

Purpose of the Study:

  • To present a unified phenomenological theory for salt-induced Hofmeister phenomena.
  • To link protein solubility and interfacial tension to understand salt effects.
  • To explain chaotropic stabilization of proteins.

Main Methods:

  • Developed a theory relating protein solubility to protein-water interfacial tension.
  • Applied the theory to model salt-dependent free energy profiles of proteins.
  • Experimentally validated the theory using bacteriorhodopsin and myoglobin.

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Main Results:

  • Demonstrated that both salting out and salting in arise from salt-induced changes in protein-water interfacial properties.
  • Distinguished three classes of protein conformations based on their response to salts.
  • Provided experimental evidence supporting the theory using model proteins.

Conclusions:

  • The new theory successfully accounts for diverse salt effects on protein conformation, dynamics, and stability.
  • The findings resolve anomalies like chaotropes stabilizing proteins.
  • Established a link between interfacial tension, protein stability, and conformational fluctuations, offering a microscopic basis for Hofmeister effects.