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• W2134141880 abstract "Protein misfolding is a ubiquitous phenomenon associated with a wide range of diseases. Single-molecule approaches offer a powerful tool for deciphering the mechanisms of misfolding by measuring the conformational fluctuations of a protein with high sensitivity. We applied single-molecule force spectroscopy to observe directly the misfolding of the prion protein PrP, a protein notable for having an infectious misfolded state that is able to propagate by recruiting natively folded PrP. By measuring folding trajectories of single PrP molecules held under tension in a high-resolution optical trap, we found that the native folding pathway involves only two states, without evidence for partially folded intermediates that have been proposed to mediate misfolding. Instead, frequent but fleeting transitions were observed into off-pathway intermediates. Three different misfolding pathways were detected, all starting from the unfolded state. Remarkably, the misfolding rate was even higher than the rate for native folding. A mutant PrP with higher aggregation propensity showed increased occupancy of some of the misfolded states, suggesting these states may act as intermediates during aggregation. These measurements of individual misfolding trajectories demonstrate the power of single-molecule approaches for characterizing misfolding directly by mapping out nonnative folding pathways." @default.
• W2134141880 created "2016-06-24" @default.
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• W2134141880 date "2012-03-15" @default.
• W2134141880 modified "2023-10-13" @default.
• W2134141880 title "Direct observation of multiple misfolding pathways in a single prion protein molecule" @default.
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• W2134141880 doi "https://doi.org/10.1073/pnas.1107736109" @default.
• W2134141880 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3325692" @default.
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• W2134141880 hasPublicationYear "2012" @default.
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