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Related Experiment Videos

Using dysprosium complexes to probe the nitrogenase paramagnetic centers

M E Oliver1, B J Hales

  • 1Department of Chemistry, Louisiana State University, Baton Rouge 70803-1804.

Biochemistry
|June 15, 1993
PubMed
Summary
This summary is machine-generated.

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Electron paramagnetic resonance (EPR) spectroscopy revealed distances between dysprosium (Dy3+) complexes and nitrogenase metal clusters. These findings offer insights into nitrogenase protein interactions and metal cluster accessibility.

Area of Science:

  • Biochemistry
  • Biophysics
  • Enzyme kinetics

Background:

  • Nitrogenase is a crucial enzyme for biological nitrogen fixation.
  • Understanding the structural and functional relationships of nitrogenase components is vital.
  • Paramagnetic centers within nitrogenase are key to its catalytic activity.

Purpose of the Study:

  • To determine the proximity of dysprosium (Dy3+) complexes to nitrogenase metal clusters using EPR spectroscopy.
  • To model the interaction between Dy3+ and nitrogenase components to elucidate structural constraints.
  • To investigate how interactions between Fe-protein and MoFe-protein affect metal cluster accessibility.

Main Methods:

  • Electron paramagnetic resonance (EPR) progressive power saturation techniques were employed.

Related Experiment Videos

  • Dy3+ complexes were used to induce relaxation enhancement of nitrogenase paramagnetic centers.
  • Three models were developed to relate Dy3+ enhancement to distances from metal clusters.

    • Main Results:

    • The distance of closest approach of Dy3+ to the [4Fe-4S] cluster in Azotobacter vinelandii Fe-protein was 5.0-6.5 Å.
    • The distance of closest approach to FeMoco in the MoFe-protein was determined to be ≥ 6 Å.
    • Complex formation between specific Fe-protein and MoFe-protein from different sources blocked Dy3+-induced enhancement, indicating overlapping metal clusters.

    Conclusions:

    • The study quantifies the distances between Dy3+ and nitrogenase metal clusters, providing structural information.
    • The accessibility of metal clusters in Fe-protein and MoFe-protein is constrained and does not significantly change upon complex formation or cross-linking.
    • Interactions between nitrogenase components restrict access to their respective metal clusters, as evidenced by the blocking of Dy3+ relaxation enhancement.