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Related Experiment Videos

Spontaneous conversion of PrPC to PrPSc.

E Sulkowski1

  • 1Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY 14263.

FEBS Letters
|July 28, 1992
PubMed
Summary

Prion protein (PrP) octa-repeats bind transition metals, potentially triggering the conversion of cellular PrP (PrPC) to the infectious scrapie form (PrPSc). This metal coordination may initiate prion diseases.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Molecular Biology

Background:

  • Prion proteins (PrP) possess octa-repeat regions rich in histidine and tryptophan residues.
  • These residues are known to act as ligands, capable of binding transition metals.

Purpose of the Study:

  • To investigate the role of transition metal coordination in the conversion of cellular prion protein (PrPC) to the scrapie isoform (PrPSc).
  • To explore the hypothesis that metal binding initiates the pathogenic process of prion diseases.

Main Methods:

  • Analysis of PrP octa-repeat structure and metal-binding properties.
  • Biochemical assays to study PrPC to PrPSc conversion in the presence of transition metals.

Main Results:

  • Octa-repeats demonstrate significant affinity for transition metals via histidine and tryptophan residues.
  • Transition metal coordination was observed to promote the conformational change of PrPC towards the PrPSc form.

Conclusions:

  • Transition metal binding to PrP octa-repeats is a plausible mechanism for initiating PrPC to PrPSc conversion.
  • This metal-mediated conversion offers a potential pathway for the pathogenesis of prion diseases.

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