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Related Experiment Videos

Pulsed 180-GHz EPR/ENDOR/PELDOR spectroscopy.

M M Hertel1, V P Denysenkov, M Bennati

  • 1Institute for Physical and Theoretical Chemistry and Center for Biomolecular Magnetic Resonance, J. W. Goethe-University, Frankfurt am Main, Germany.

Magnetic Resonance in Chemistry : MRC
|October 20, 2005
PubMed
Summary

We developed a high-frequency pulsed electron paramagnetic resonance (EPR) spectrometer at 180 GHz, incorporating electron nuclear double resonance (ENDOR) and pulsed electron double resonance (PELDOR) for advanced molecular motion and distance measurements.

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Area of Science:

  • Spectroscopy
  • Physical Chemistry
  • Biophysics

Background:

  • Electron Paramagnetic Resonance (EPR) is a powerful technique for studying paramagnetic species.
  • High-frequency EPR offers enhanced spectral resolution and sensitivity.
  • Pulsed EPR techniques like ENDOR and PELDOR provide detailed structural and dynamic information.

Purpose of the Study:

  • To describe a novel home-built 180 GHz pulsed EPR spectrometer.
  • To demonstrate the integration and application of electron nuclear double resonance (ENDOR) and pulsed electron double resonance (PELDOR) techniques.
  • To showcase the spectrometer's capabilities in analyzing molecular dynamics and distances in various systems.

Main Methods:

  • Construction and operation of a 180 GHz pulsed EPR spectrometer.

Related Experiment Videos

  • Application of Hahn-echo decay measurements for studying molecular motions.
  • Utilizing Mims and Davies ENDOR sequences for 1H-ENDOR spectroscopy.
  • Employing a three-pulse ELDOR sequence for PELDOR measurements.

    • Main Results:

    • Precise observation of anisotropic librational motions in a TEMPO/polystyrene sample at high magnetic fields.
    • Successful illustration of 1H-ENDOR performance using bisdiphenylene-phenyl-allyl as a model system.
    • Acquisition of 1H-ENDOR spectra from the wild-type Ras*Mn2+*GDP protein.
    • Demonstration of 180 GHz PELDOR capabilities on Escherichia coli ribonucleotide reductase (RNR) subunit R2, measuring a 33 angstrom distance between tyrosyl radicals.
    • Observation of orientation selectivity and agreement with theoretical predictions at 180 GHz.

    Conclusions:

    • The 180 GHz pulsed EPR spectrometer, with integrated ENDOR and PELDOR, is a versatile tool for high-resolution studies.
    • The system enables precise characterization of molecular dynamics and distances in both model and biological systems.
    • High-frequency EPR significantly enhances spectral resolution and provides unique insights into paramagnetic species.