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Updated: Mar 12, 2026

Coupled Assays for Monitoring Protein Refolding in Saccharomyces cerevisiae
Published on: July 9, 2013
Prions, Chaperones, and Proteostasis in Yeast
Tatiana A Chernova1, Keith D Wilkinson1, Yury O Chernoff2,3
1Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322.
Yeast prions, self-perpetuating proteins, rely on cellular machinery for propagation. This relationship with protein quality control offers insights into treating human amyloid diseases.
Area of Science:
- Molecular Biology
- Cell Biology
- Protein Chemistry
Background:
- Prions are misfolded proteins causing disease.
- Yeast prions serve as a model for studying prion biology.
- Cellular protein quality control mechanisms are crucial for cellular health.
Purpose of the Study:
- To investigate the role of cellular quality control in yeast prion propagation.
- To understand how environmental stresses affect prion distribution.
- To explore the implications for mammalian amyloid diseases.
Main Methods:
- Utilized yeast as a model organism.
- Investigated the involvement of chaperone machinery (Hsp104/70/40).
- Examined the influence of ribosome-associated chaperones, proteolysis, and cytoskeleton.
Main Results:
- Yeast prion propagation is regulated by the Hsp104/70/40 chaperone system.
- Cellular quality control components (chaperones, proteasomes, cytoskeleton) influence prion formation, maintenance, and toxicity.
- Environmental stresses induce asymmetric prion segregation during cell division, mediated by chaperones and cytoskeletal proteins.
Conclusions:
- Yeast prions are intimately linked with the cell's protein quality control machinery for their maintenance and reproduction.
- Similar cellular mechanisms in higher eukaryotes suggest potential therapeutic targets for mammalian amyloid diseases.
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