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Anti-Prion Systems in Saccharomyces cerevisiae.

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Yeast cells possess multiple anti-prion defense systems that collectively prevent the formation and spread of infectious proteins like [PSI+] and [URE3]. These systems, including chaperones and disaggregases, significantly reduce prion appearance and offer insights into human amyloid diseases.

Keywords:
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Area of Science:

  • Molecular Biology
  • Protein Chemistry
  • Genetics

Background:

  • Yeast prions, such as [PSI+] (Sup35p) and [URE3] (Ure2p), are infectious proteins that mimic mammalian prion diseases.
  • These prions are associated with essential cellular functions, including translation termination and nitrogen metabolism.

Purpose of the Study:

  • To investigate the history and mechanisms of anti-prion defense systems in Saccharomyces cerevisiae.
  • To understand how these systems prevent prion infection, generation, propagation, and toxicity.
  • To explore the potential of yeast anti-prion systems as models for human amyloid diseases.

Main Methods:

  • Historical tracing of yeast prion research.
  • Description and analysis of multiple anti-prion systems in yeast.
  • Quantification of the inhibitory effects of individual and combined anti-prion systems on prion appearance.
  • Screening for human anti-prion proteins using yeast prion models.

Main Results:

  • S. cerevisiae employs an array of anti-prion systems that collectively inhibit prion formation and propagation.
  • Ribosome-associated chaperones, Hsp104 disaggregase, and Upf proteins synergistically reduce [PSI+] appearance by approximately 5000-fold.
  • Most [PSI+] variants exhibit sensitivity to these anti-prion systems.
  • Five human Bag protein family members demonstrate anti-prion activity in yeast models.

Conclusions:

  • Yeast anti-prion systems provide robust protection against prion propagation and toxicity.
  • The identified human anti-prion proteins suggest potential therapeutic targets for human amyloidosis.
  • Manipulation of human anti-prion systems may offer a strategy for preventing or treating prion-based human diseases.