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Protein hydration dynamics in aqueous solution

V P Denisov1, B Halle

  • 1Department of Chemistry, Lund University, Sweden.

Faraday Discussions
|January 1, 1996
PubMed
Summary
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Protein hydration dynamics were studied using water spin relaxation rates. Long-lived integral water molecules, crucial for protein function, were identified with residence times up to 10(-3) seconds.

Area of Science:

  • Biophysics
  • Structural Biology
  • Physical Chemistry

Background:

  • Protein hydration is crucial for protein structure and function.
  • Understanding water dynamics at protein interfaces is key to molecular biology.
  • Previous studies explored hydration in smaller proteins.

Purpose of the Study:

  • To investigate protein hydration dynamics in aqueous solutions of large proteins.
  • To characterize the behavior of integral and surface-associated water molecules.
  • To correlate water dynamics with protein structure and function.

Main Methods:

  • Water oxygen-17 and deuteron spin relaxation rate measurements.
  • Frequency-dependent relaxation rate analysis.
  • Comparison with crystallographic data and computational simulations.

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Main Results:

  • Identified long-lived integral water molecules (10^-9 to 10^-3 s residence times) in cavities, clefts, or coordinated to ions.
  • Determined average residence times of 10-50 ps for surface hydration layer water.
  • Revealed specific hydration features like water in crystallographically empty cavities and domain interfaces.

Conclusions:

  • The findings support existing models of protein hydration dynamics.
  • Integral water molecules play a significant role in protein stability and function.
  • Spin relaxation provides insights into complex water-protein interactions and dynamics.