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Related Experiment Video

Updated: Apr 21, 2026

Quantifying the Binding Interactions Between CuII and Peptide Residues in the Presence and Absence of Chromophores
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Copper-zinc cross-modulation in prion protein binding.

Francesco Stellato1, Velia Minicozzi, Glenn L Millhauser

  • 1Department of Physics and INFN, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133, Rome, Italy.

European Biophysics Journal : EBJ
|November 15, 2014
PubMed
Summary

Zinc and copper ions compete for binding to prion protein peptides, influencing their aggregation. The order of metal addition dictates binding modes and peptide cluster formation, revealing a finely tuned interplay affecting protein binding and cellular metal regulation.

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Area of Science:

  • Biochemistry
  • Metalloprotein Chemistry
  • Prion Protein Research

Background:

  • Prion diseases are linked to misfolded prion proteins.
  • Metal ions like copper and zinc play roles in prion protein structure and function.
  • Understanding metal-prion protein interactions is crucial for disease research.

Purpose of the Study:

  • To investigate the competitive binding of copper (Cu(II)) and zinc (Zn(II)) to the prion protein's tetra-octarepeat region.
  • To elucidate how the order of metal ion addition affects metal-peptide complexation and structure.
  • To explore the implications of these interactions on peptide aggregation and cellular metal homeostasis.

Main Methods:

  • Systematic X-ray absorption spectroscopy (XAS) studies at both Cu and Zn K-edges.

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  • Analysis of samples with varying relative concentrations of Cu(II) and Zn(II).
  • Comparison with previous electron paramagnetic resonance (EPR) and XAS data.

    • Main Results:

    • Zn(II) and Cu(II) ions compete for binding sites on the tetra-octarepeat peptide.
    • The binding mode and resulting structure depend on both relative metal concentrations and the sequence of metal addition.
    • Zn(II) can promote the formation of small peptide clusters, which are disrupted by subsequent Cu(II) addition.
    • Cu(II) competes with Zn(II) but cannot fully displace it, indicating cross-regulation of binding.

    Conclusions:

    • Metal ion binding to prion protein peptides is a complex process involving cross-regulation.
    • The order of metal ion introduction significantly impacts the resulting metal-peptide complex structure and aggregation.
    • These findings suggest a potential mechanism for cellular regulation of metal ion concentrations through protein interactions.