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Copper-glutathione complexes under physiological conditions: structures in solution different from the solid state

J Z Pederson1, C Steinkühler, U Weser

  • 1Department of Biology, University of Rome Tor Vergata, Italy.

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
|January 1, 1996
PubMed
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Electron spin resonance (ESR) spectroscopy reveals copper(II) binds oxidized glutathione at neutral pH using specific gamma-glutamyl residues. This physiologically relevant solution structure differs significantly from its known solid-state form.

Area of Science:

  • Biochemistry
  • Bioinorganic Chemistry
  • Spectroscopy

Background:

  • Copper is essential for numerous biological processes.
  • Oxidized glutathione (GSSG) plays a critical role in cellular redox homeostasis.
  • Understanding copper-GSSG interactions is vital for cellular function.

Purpose of the Study:

  • To elucidate the binding site and structure of copper(II) complexes with oxidized glutathione in aqueous solution.
  • To compare the solution structure with known solid-state structures and other related complexes.
  • To investigate the aggregation state and mobility of copper-GSSG complexes.

Main Methods:

  • Electron spin resonance (ESR) spectroscopy at low and liquid temperatures.
  • Analysis of spectral anisotropy and ligand coordination.

Related Experiment Videos

  • Comparison with copper complexes of S-methylglutathione, glutamine, glutamate, and glycine.

    • Main Results:

    • Copper(II) binds to the amino nitrogens and carboxyl oxygens of two gamma-glutamyl residues in oxidized glutathione.
    • No interaction was observed with amide nitrogens, sulfur, or glycyl carboxyl groups.
    • A binuclear species forms at high metal-to-ligand ratios.
    • The forbidden transition at g=4 is attributed to aggregation, not spin coupling.
    • The Cu(II)-GSSG complex exists as a dimer in solution with lower mobility than Cu(II)-S-methylglutathione.

    Conclusions:

    • The physiologically relevant copper(II)-oxidized glutathione complex in solution exhibits a distinct structure compared to its crystallographically determined solid-state form.
    • The binding involves specific coordination within the gamma-glutamyl residues, highlighting the importance of solution-state characterization.
    • ESR spectroscopy provides crucial insights into the dynamic and structural properties of metallodrug complexes in biologically relevant conditions.