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Screening for Amyloid Aggregation by Semi-Denaturing Detergent-Agarose Gel Electrophoresis
Published on: July 16, 2008
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Loss of Residues 119-136, Including the First β-strand of Human Prion Protein, Generates an Aggregation-competent
Laszlo L P Hosszu1, Daljit Sangar1, Mark Batchelor1
1MRC Prion Unit at UCL, UCL Institute of Prion Diseases, 33 Cleveland Street, London W1W 7FF, UK(†).
Journal of Molecular Biology
|May 27, 2023
Summary
Prion protein (PrPC) structural conversion is key to prion disease. Removing specific residues (119-136) creates an "open" PrP conformer that fibrillizes more readily, suggesting a stepwise folding transition.
Area of Science:
- Biochemistry
- Structural Biology
- Neuroscience
Background:
- Prion replication involves the conformational transition of cellular prion protein (PrPC) to disease-associated forms.
- Transmembrane prion protein (PrP) structures are implicated in this conversion.
- Unfolding the PrPC structural core presents an energy barrier, potentially reduced by membrane interactions.
Purpose of the Study:
- To investigate the impact of removing residues 119-136 of PrP on the structure, stability, and self-association of the folded PrPC domain.
- To explore the role of this specific region in the conformational transition of PrPC.
Main Methods:
- Deletion mutagenesis of PrP residues 119-136.
- Structural and stability analysis of the folded PrPC domain.
- Assessment of self-association properties.
Main Results:
- Removal of residues 119-136 resulted in an "open" native-like conformer.
- This open conformer exhibited increased solvent exposure.
- The modified PrP readily fibrillized compared to the native state.
Conclusions:
- The data suggest a stepwise folding transition mechanism for PrPC.
- The conformational switch to an "open" form initiates this transition.
- The deleted region (119-136) plays a role in maintaining the native PrPC structure and regulating fibril formation.
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