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Related Experiment Videos

Protein hydration dynamics in solution: a critical survey.

Bertil Halle1

  • 1Department of Biophysical Chemistry, Lund University, SE-22100 Lund, Sweden. bertil.halle@bpc.lu.se

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|August 13, 2004
PubMed
Summary

Protein hydration water is highly mobile, moving only twice as slow as bulk water. This mobility is crucial for biological processes like binding and catalysis at protein surfaces.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Structural Biology

Background:

  • Protein hydration, the interaction between water and protein surfaces, remains poorly understood.
  • Previous studies on water dynamics near proteins yielded controversial and conflicting results.

Purpose of the Study:

  • To critically analyze existing concepts of protein hydration dynamics.
  • To evaluate the experimental evidence supporting current models of protein hydration.

Main Methods:

  • Oxygen-17 magnetic relaxation dispersion (MRD) experiments.
  • Comparison with data from molecular dynamics simulations, nuclear Overhauser effect spectroscopy, dielectric relaxation, and fluorescence spectroscopy.

Main Results:

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  • MRD experiments reveal that protein hydration water is only twofold slower than bulk water.
  • This high mobility supports rapid protein-water interface processes like binding and catalysis.
  • Discrepancies with other spectroscopic methods and hydrodynamic models are addressed.

    • Conclusions:

    • The protein hydration layer exhibits significantly higher mobility than previously assumed.
    • This dynamic picture reconciles conflicting experimental data and theoretical models.
    • High hydration water mobility is essential for efficient biological functions at the protein surface.