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All-atom simulation of the HET-s prion replication.

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Computer simulations using Self-Consistent Path Sampling reveal that prions, infectious proteins, replicate via a shared templating mechanism. This method advances understanding of prion propagation in both physiological and pathological contexts.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Neuroscience

Background:

  • Prions are infectious proteins lacking nucleic acids, known for causing neurodegenerative diseases.
  • Functional prions also exist, playing physiological roles across species.
  • Prion replication involves amyloid conformers inducing conversion of soluble counterparts.

Purpose of the Study:

  • To investigate the physico-chemical mechanisms of prion replication using advanced computational methods.
  • To overcome limitations of traditional biophysical experiments and molecular dynamics (MD) simulations.
  • To explore the replication mechanism of the fungal prion HET-s using atomistic detail.

Main Methods:

  • Utilized the Self-Consistent Path Sampling (SCPS) algorithm for simulations.
  • Employed state-of-the-art all-atom force fields in explicit solvent.
  • Validated SCPS by comparing protein folding simulations with plain MD results.

Main Results:

  • SCPS simulations successfully characterized protein folding, aligning with plain MD.
  • Investigated the prion forming domain of the fungal prion HET-s.
  • Atomistic reconstruction revealed similarities to mammalian PrPSc propagation mechanisms.

Conclusions:

  • SCPS is a viable computational tool for studying prion replication.
  • Prion propagation mechanisms may share common features across evolutionarily distant proteins.
  • A conserved templating mechanism is suggested for prion conformation propagation.