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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Overhauser dynamic nuclear polarization to study local water dynamics.

Brandon D Armstrong1, Songi Han

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA.

Journal of the American Chemical Society
|March 18, 2009
PubMed
Summary

Overhauser dynamic nuclear polarization (DNP) quantifies local water dynamics near spin labels. This method accurately determines the coupling factor, revealing solvent diffusion crucial for molecular function.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Soft Matter Science

Background:

  • Understanding water dynamics is crucial for molecular structure and function.
  • Experimental determination of local water dynamics, especially within 5 Å, is challenging.
  • Paramagnetic probes, like nitroxide spin labels, can modulate nuclear spin relaxation rates of water protons.

Purpose of the Study:

  • To introduce and validate a method for quantifying local water dynamics using Overhauser dynamic nuclear polarization (DNP).
  • To demonstrate the accurate determination of the coupling factor, a key DNP parameter.
  • To present measurements of local hydration dynamics around nitroxides in bulk water and on protein surfaces.

Main Methods:

  • Utilized Overhauser dynamic nuclear polarization (DNP) to measure local water dynamics.
  • Employed nitroxide spin labels as paramagnetic probes to modulate water proton relaxation.
  • Quantitatively determined the coupling factor by accurately measuring the saturation factor for the spin label.

Main Results:

  • Successfully quantified the coupling factor, revealing local translational diffusion dynamics of water within 5 Å of the spin label.
  • Demonstrated accurate determination of the saturation factor, resolving previous challenges in quantifying the coupling factor for nitroxide radicals.
  • Presented the first agreement between DNP measurements and theoretical predictions for the coupling factor.
  • Showcased DNP measurements of local hydration dynamics in bulk water and on protein surfaces.

Conclusions:

  • Overhauser dynamic nuclear polarization (DNP) is a powerful technique for quantifying local water dynamics with high sensitivity.
  • The DNP method allows for accurate determination of the coupling factor, providing insights into solvent diffusion at the molecular level.
  • The findings support the validity of DNP-determined coupling factors and offer a robust approach for studying hydration dynamics.