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Getting to the core of prion superstructural variability.

Joan Torrent1, Reinhard Lange2, Angelique Igel-Egalon1

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Summary

Protein superstructural polymorphism explains different disease phenotypes in neurodegenerative diseases. Pressure-induced changes in prion protein (PrP) structures reveal distinct volumetric properties, aiding in distinguishing prion strains.

Keywords:
amyloidoligomerpressureprionprotein misfoldingstrain

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Area of Science:

  • Biophysics
  • Neuroscience
  • Structural Biology

Background:

  • Protein superstructural polymorphism is key to understanding prion strains and age-related neurodegenerative diseases.
  • Prion-like processes, driven by self-associated proteins, contribute to diverse disease phenotypes.
  • Characterizing insoluble, heterogeneous prion proteins is challenging for biophysical studies.

Purpose of the Study:

  • To explore pressure-induced changes in prion protein (PrP) quaternary structures.
  • To investigate the potential of pressure response for characterizing prion strains.
  • To link thermodynamic properties to structural features of PrP.

Main Methods:

  • Applying hydrostatic pressure to induce conformational changes in PrP.
  • Analyzing thermodynamics of pressure-induced misfolding and self-assembly.
  • Deducing structural features from associated volume changes.

Main Results:

  • Pressure induces quaternary structural changes in PrP, including misfolding and self-assembly.
  • Thermodynamic analysis reveals volume changes associated with these structural transitions.
  • Distinct volumetric properties correlate with different prion strains.

Conclusions:

  • Pressure-induced changes in PrP offer a novel method for studying prion strains.
  • Volume changes reflect structural voids at PrP protomer interfaces.
  • This approach may enable differentiation of conformation-encoded prion strains.