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Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain
Published on: October 3, 2012
Immunopurification of pathological prion protein aggregates
Emiliano Biasini1, Laura Tapella, Susanna Mantovani
1Dulbecco Telethon Institute, Milan, Italy.
Plos One
|November 17, 2009
Summary
A new method purifies pathological prion protein (PrP) aggregates, including those lacking protease resistance. These purified aggregates are biologically active, seeding misfolding and showing neurotoxicity, aiding prion disease research.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Prion diseases are fatal neurodegenerative disorders caused by misfolded prion protein (PrP).
- Current purification methods often rely on protease digestion, limiting the isolation of protease-resistant PrP.
- This excludes abnormal PrP forms found in genetic and atypical sporadic prion diseases.
Purpose of the Study:
- To develop a novel method for purifying pathological prion protein (PrP) molecules.
- To isolate full-length PrP(Sc) and mutant PrP aggregates, including those lacking protease resistance.
Main Methods:
- Sequential centrifugation and immunoprecipitation using a monoclonal antibody specific for aggregated PrP.
- Purification of pathological PrP molecules from prion-infected and transgenic mice.
Main Results:
- Successfully purified full-length PrP(Sc) and mutant PrP aggregates to electrophoretic homogeneity.
- Purified PrP(Sc) seeded PrP(C) misfolding in a protein misfolding cyclic amplification reaction.
- Mutant PrP aggregates demonstrated toxicity to cultured neurons.
Conclusions:
- The developed immunopurification protocol isolates biologically active, aggregated PrP forms.
- These preparations are valuable for studying the structural and biochemical properties of infectious and neurotoxic PrP aggregates.
- This method advances prion disease research by enabling the study of previously inaccessible PrP conformations.
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