Amyloid Prions in Fungi

Area of Science:

• Molecular Biology
• Protein Biochemistry
• Genetics

Background:

• Prions are infectious protein polymers known to cause fatal neurodegenerative diseases in mammals.
• Prions have also been identified in fungi, such as yeast and filamentous fungi, functioning as cytoplasmic non-Mendelian genetic elements.
• Fungal prions are typically amyloid aggregates characterized by rich beta-sheet structures.

Purpose of the Study:

• To review the fundamental aspects of prion structure and propagation, particularly those elucidated by fungal and yeast prion models.
• To highlight the role of these models in establishing the protein-only nature of prions and the basis of strain variation.
• To discuss the involvement of chaperones in prion propagation and amyloid aggregate management.

Main Methods:

• Review and synthesis of existing research on fungal and yeast prions.
• Analysis of studies detailing prion structure, propagation mechanisms, and genetic behavior.
• Examination of the role of molecular chaperones in prion dynamics.

Main Results:

• Fungal prion models, especially yeast prions, were crucial in defining prions as 'protein-only' infectious agents.
• These models elucidated the physical basis for prion strain diversity.
• Chaperone proteins were identified as key players in managing prion propagation and amyloid aggregation.

Conclusions:

• Fungal prions, including those in yeast, serve as invaluable models for understanding prion biology.
• Unlike their mammalian counterparts, fungal prions are not always pathogenic and can confer adaptive advantages.
• The study of fungal prions continues to advance our knowledge of protein misfolding diseases and prion phenomena.