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Assessing Transmissible Spongiform Encephalopathy Species Barriers with an In Vitro Prion Protein Conversion Assay
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Insight From Animals Resistant to Prion Diseases: Deciphering the Genotype - Morphotype - Phenotype Code for the
Ryan Myers1, Alessandro Cembran2, Pedro Fernandez-Funez1
1Department of Biomedical Sciences, University of Minnesota Medical School, Duluth, MN, United States.
Frontiers in Cellular Neuroscience
|October 5, 2020
Summary
Prion diseases stem from misfolded prion protein (PrP). Resistant animals possess specific amino acids in PrP that enhance structural stability, offering insights into disease mechanisms.
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Prion diseases are fatal neurodegenerative disorders caused by misfolded prion protein (PrP).
- Animal susceptibility to prion diseases varies, with species like horses, rabbits, pigs, and dogs exhibiting high resistance.
- PrP sequence variations are key determinants of this differential susceptibility.
Purpose of the Study:
- To investigate the structural basis of prion protein (PrP) resistance in certain animal species.
- To identify specific amino acid residues and structural domains that confer conformational stability and disease resistance.
- To elucidate the mechanisms underlying PrP misfolding, neurotoxicity, and transmission.
Main Methods:
- Comparative analysis of prion protein (PrP) sequences from susceptible and resistant species.
- Molecular dynamics simulations of PrP mutations associated with resistance.
- Structural studies to identify key subdomains within the PrP globular domain.
- Testing in manipulable animal models to assess disease susceptibility.
Main Results:
- Specific amino acid residues (e.g., D/E159 in dogs, S167 in horses, S174 in rabbits/pigs) are linked to enhanced PrP conformational stability.
- These protective residues are hypothesized to stabilize a C-terminal subdomain of the PrP globular domain.
- Understanding these structural correlates is crucial for deciphering PrP toxicity.
Conclusions:
- PrP sequence differences, particularly in specific residues, dictate conformational stability and disease susceptibility.
- Stabilizing amino acids likely promote more compact structures within the PrP globular domain.
- Identifying these critical subdomains will advance our understanding of prion disease pathogenesis and inform therapeutic strategies.
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