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RIDME Spectroscopy with Gd(III) Centers.

Sahand Razzaghi1, Mian Qi2, Anna I Nalepa3

  • 1†Laboratory of Physical Chemistry, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.

The Journal of Physical Chemistry Letters
|August 16, 2015
PubMed
Summary

Relaxation Induced Dipolar Modulation Enhancement (RIDME) at W-band frequencies allows for precise Gd(III)-Gd(III) distance measurements. This technique offers enhanced modulation depth for biomolecular structural characterization.

Keywords:
DEEREPRESRdipolar spectroscopydistance measurementslanthanide ions

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Area of Science:

  • Electron paramagnetic resonance spectroscopy
  • Biophysical chemistry
  • Structural biology

Background:

  • Electron spin relaxation phenomena are crucial for understanding molecular dynamics.
  • Dipolar interactions between paramagnetic centers provide distance information.
  • Current techniques face limitations in sensitivity and achievable modulation depth.

Purpose of the Study:

  • To investigate the application of Relaxation Induced Dipolar Modulation Enhancement (RIDME) at W-band frequencies (94 GHz).
  • To explore the extraction of interspin distance distributions for Gd(III) complexes.
  • To evaluate the potential of RIDME for structural characterization of biomacromolecules.

Main Methods:

  • Application of RIDME technique at W-band microwave frequencies (approx. 94 GHz).
  • Utilized Gd(III) complexes with a rodlike spacer to study interspin interactions.
  • Analysis of dipolar patterns, including fundamental interactions and higher harmonics.

Main Results:

  • RIDME data yields dipolar patterns that are superpositions of Pake-like patterns.
  • The relative weights of stretched patterns showed minimal dependence on mixing time.
  • Achieved significantly larger modulation depths compared to double electron-electron resonance at the same frequency.

Conclusions:

  • Gd(III)-Gd(III) RIDME at W-band is a promising technique for structural characterization.
  • The method offers advantages in modulation depth for distance measurements.
  • Potential applications include the study of biomacromolecules and their complexes.