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The Structure of PrPSc Prions.

Holger Wille1, Jesús R Requena2

  • 1Centre for Prions and Protein Folding Diseases & Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2M8, Canada. wille@ualberta.ca.

Pathogens (Basel, Switzerland)
|February 8, 2018
PubMed
Summary

Scrapie isoform of the prion protein (PrPSc) prions cause fatal neurodegenerative diseases. Research reveals PrPSc has a four-rung β-solenoid structure, offering insights into prion propagation mechanisms.

Keywords:
PrPScamyloidcryo-electron microscopyprion propagationprion structureβ-solenoid

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Area of Science:

  • Structural Biology
  • Neuroscience
  • Infectious Diseases

Background:

  • Prion diseases like CJD are caused by the scrapie isoform of the prion protein (PrPSc).
  • PrPSc is an aggregated, insoluble form of the cellular prion protein (PrPC).
  • The high-resolution structure of PrPSc has been challenging to determine due to its aggregation properties.

Purpose of the Study:

  • To summarize current knowledge on the structure of PrPSc.
  • To explore molecular mechanisms of PrPC to PrPSc conversion.
  • To provide a structural framework for understanding prion propagation.

Main Methods:

  • Cryo-electron microscopy
  • X-ray fiber diffraction
  • Biophysical characterization of PrPSc aggregates

Main Results:

  • The structure of PrPSc has been characterized as a four-rung β-solenoid.
  • This structural model explains the autocatalytic propagation of PrPSc.
  • High-resolution structural data for PrPSc is still pending.

Conclusions:

  • The four-rung β-solenoid model provides a framework for understanding prion structure and replication.
  • Further research is needed to elucidate the precise high-resolution structure of PrPSc.
  • Understanding PrPSc structure is crucial for developing therapeutic strategies against prion diseases.