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Full atomistic model of prion structure and conversion.

Giovanni Spagnolli1, Marta Rigoli1,2, Simone Orioli2,3

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Researchers developed the first atomic model of prion protein scrapie isoform (PrPSc) using a 4-rung beta-solenoid structure. This breakthrough allows simulations of prion propagation, advancing our understanding of these infectious proteins.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Prions are infectious proteins lacking genetic material, known to cause neurodegenerative diseases.
  • The structure of the scrapie isoform of the prion protein (PrPSc) has been elusive, with proposed models including Parallel-In-Register-β-Sheet (PIRIBS) and β-solenoid conformations.
  • Recent cryo-electron microscopy and X-ray fiber diffraction studies suggest PrPSc adopts a 4-rung β-solenoid (4RβS) architecture.

Purpose of the Study:

  • To construct the first physically plausible, atomic-resolution model of mouse PrPSc based on the 4RβS architecture.
  • To assess the stability of the proposed PrPSc model using computational simulations.
  • To simulate the mechanism of prion protein conversion and propagation.

Main Methods:

  • Integration of diverse experimental data with computational techniques.
  • Development of an atomic-resolution model of PrPSc utilizing the 4RβS framework.
  • Molecular Dynamics (MD) simulations to evaluate model stability and simulate prion conversion.

Main Results:

  • A stable, atomic-resolution model of mouse PrPSc was generated, consistent with the 4RβS structure.
  • The stability of the PrPSc model was comparable to known β-solenoid proteins like Het-s.
  • The 4RβS model enabled the first simulation of the conversion process from cellular prion protein (PrPC) to PrPSc.

Conclusions:

  • This study presents the most current, experimentally-supported, and physically coherent model of PrPSc.
  • The findings provide unprecedented insights into the mechanism of prion self-catalytic propagation.
  • The atomic model and simulation open new avenues for understanding and potentially targeting prion diseases.