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Similar and divergent features in mammalian and yeast prions
1Laboratoire d'enzymologie et biochimie structurales, CNRS, Bât. 34, avenue de la Terrasse, 91198 Gif-sur-Yvette, France.
Abstract:
Mammalian transmissible spongiform encephalopathies are likely due to the propagation of an abnormal form of a constitutive protein instead of traditional genetic material (nucleic acids). Such infectious proteins, which are termed prions, exist in yeast. They are at the origin of a number of phenotypes that are inherited in a non-Mendelian manner. These prions are very useful to dissect the molecular events at the origin of this structure-based inheritance. The properties of mammalian and yeast prions are presented and compared. This review highlights a number of similarities and differences.
Insights
Mammalian transmissible spongiform encephalopathies are caused by infectious proteins called prions, not nucleic acids. Yeast prions, similar to mammalian ones, offer insights into non-Mendelian inheritance and prion structure.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Mammalian transmissible spongiform encephalopathies (TSEs) are neurodegenerative diseases linked to abnormal protein propagation.
- Unlike traditional genetic diseases, TSEs are thought to involve infectious proteins known as prions.
- Prions, or infectious proteins, are also found in yeast, influencing phenotypes inherited in a non-Mendelian fashion.
Purpose of the Study:
- To compare the properties of mammalian and yeast prions.
- To elucidate the molecular mechanisms underlying prion-based inheritance.
- To highlight similarities and differences between prions from different organisms.
Main Methods:
- Literature review and comparative analysis of existing research on mammalian and yeast prions.
- Examination of the structural and functional characteristics of prions.
- Analysis of inheritance patterns associated with prions in yeast.
Main Results:
- Yeast prions serve as a valuable model for studying the fundamental processes of prion formation and propagation.
- Similarities exist in the protein-based nature and propagation mechanisms of mammalian and yeast prions.
- Key differences in specific molecular interactions and cellular contexts distinguish mammalian and yeast prion systems.
Conclusions:
- Prions, infectious proteins, are implicated in both mammalian TSEs and yeast inherited traits.
- Yeast prions provide a tractable system to investigate the molecular basis of structure-based inheritance.
- Comparative studies reveal conserved and divergent aspects of prion biology across eukaryotes.