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Protein hydration in aqueous solution.

K Wüthrich1, G Otting, E Liepinsh

  • 1Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule-Hönggerberg, Zürich, Switzerland.

Faraday Discussions
|January 1, 1992
PubMed
Summary

Proton nuclear magnetic resonance reveals two distinct hydration water sites in proteins. Interior water molecules bind long-term (>10 ns), while surface water exchanges rapidly (<1 ns).

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Area of Science:

  • Biophysics
  • Structural Biology
  • Protein Dynamics

Background:

  • Understanding protein hydration is crucial for molecular recognition and function.
  • Previous studies often lacked atomic-level detail on water molecule residence times.

Purpose of the Study:

  • To investigate the dynamics and binding characteristics of individual hydration water molecules.
  • To differentiate between internal and surface water binding sites in proteins.

Main Methods:

  • Proton nuclear magnetic resonance (NMR) spectroscopy, including 2D/3D NOESY and ROESY experiments.
  • Utilized nuclear Overhauser effects (NOE) to probe proton-protein and proton-water interactions.
  • Employed extrinsic shift reagents to determine residence time limits.

Main Results:

  • Identified two distinct hydration site types: internal and surface.
  • Internal water molecules in BPTI exhibit long residence times (>10 ns, up to 20 ms).
  • Surface water molecules on BPTI and oxytocin show rapid exchange rates (<1 ns).

Conclusions:

  • Protein hydration involves water molecules with significantly different residence times.
  • Internal water sites are stable, while surface hydration is dynamic and transient.
  • NMR provides atomic-level insights into protein-water interactions and hydration dynamics.

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