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Updated: Apr 11, 2026

Investigating the Spreading and Toxicity of Prion-like Proteins Using the Metazoan Model Organism C. elegans
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Structure-based view on [PSI(+)] prion properties.

Stanislav A Bondarev1, Galina A Zhouravleva, Mikhail V Belousov

  • 1a Department of Genetics and Biotechnology ; St. Petersburg State University ; St. Petersburg , Russia.

Prion
|June 2, 2015
PubMed
Summary

Researchers studied yeast prion [PSI(+)] fibrils, revealing how mutations affect their structure and formation. A new computational tool, ArchCandy, aids in understanding and designing prion properties for better prion stability research.

Keywords:
Asu mutations, antisupressor mutationsEM, electron microscopyNMR, nuclear magnetic resonancePNM, [PSI+] no moreSTEM, scanning transmission electron microscopyamyloid, prion, protein misfolding, protein structure, Saccharomyces cerevisiae, superpleated β-structure, [PSI+]

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • The yeast prion [PSI(+)] system is crucial for studying prion phenomena.
  • Limited understanding of Sup35p prion fibril 3D structure previously hindered research.
  • Recent advancements established a consensus model of parallel, in-register beta-structures for Sup35p fibrils.

Purpose of the Study:

  • To analyze the impact of amino acid substitutions on Sup35p protein's fibril-forming potential.
  • To leverage a new computational approach (ArchCandy) for understanding mutation effects.
  • To provide a framework for designing mutations to modulate prion properties.

Main Methods:

  • Analysis of amino acid substitutions within the Sup35 protein.
  • Application of the ArchCandy computational approach.
  • Utilizing the established structural model of Sup35p fibrils.

Main Results:

  • The study provides insights into how specific mutations affect Sup35p fibril formation.
  • ArchCandy successfully models the impact of mutations on prion potential.
  • The findings align with the consensus model of beta-structure fibrils.

Conclusions:

  • Elucidation of Sup35p fibril structure enables more efficient prion research.
  • The ArchCandy tool facilitates the design of novel prion variants.
  • This work advances the understanding of prion [PSI(+)] stability and propagation mechanisms.