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• W1998955425 endingPage "1030" @default.
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• W1998955425 abstract "The conversion of normal cellular prion protein (PrP) into its pathological isoform, scrapie PrP, may occur at the cell surface or, more probably, in late endosomes. The early events leading to the structural conversion of PrP appear to be related to the presence of more or less stable soluble oligomers, which might mediate neurotoxicity. In the current study, we investigate the interaction of α-rich PrP monomers and β-rich size-exclusion-chromatography-purified PrP oligomers with lipid membranes. We compare their structural properties when associated with lipid bilayers and study their propensities to permeabilize the membrane at physiological pH. We also study the influence of the N-terminal flexible region (residues 24–103) by comparing full-length PrP24–234 and N-terminally truncated PrP104–234 oligomers. We showed that both 12-subunit oligomers cause an immediate and large increase in the permeability of the membrane, whereas equivalent amounts of monomeric forms cause no detectable leakage. Although the two monomeric PrP constructs undergo an α-to-β conformational change when bound to the negatively charged membrane, only the full-length form of monomeric PrP has a weak fusogenic effect. Finally, the oligomers affect the integrity of the membrane differently from the monomers, independently of the presence of the N-terminal flexible domain. As for other forms of amyloidogenesis, a reasonable mechanism for the toxicity arising from PrP fibrillization must be associated with low-molecular-weight oligomeric intermediates, rather than with mature fibrils. Knowledge of the mechanism of action of these soluble oligomers would have a high impact on the development of novel therapeutic targets." @default.
• W1998955425 created "2016-06-24" @default.
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• W1998955425 date "2010-04-01" @default.
• W1998955425 modified "2023-10-02" @default.
• W1998955425 title "Vesicle Permeabilization by Purified Soluble Oligomers of Prion Protein: A Comparative Study of the Interaction of Oligomers and Monomers with Lipid Membranes" @default.
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• W1998955425 doi "https://doi.org/10.1016/j.jmb.2010.02.013" @default.
• W1998955425 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20156446" @default.
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