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• W2017684135 abstract "Wild-type, full-length (40- and 42-residue) amyloid β-peptide (Aβ) fibrils have been shown by a variety of magnetic resonance techniques to contain cross-β structures in which the β-sheets have an in-register parallel supramolecular organization. In contrast, recent studies of fibrils formed in vitro by the Asp23-to-Asn mutant of 40-residue Aβ (D23N-A β 1–40 ), which is associated with early onset neurodegeneration, indicate that D23N-A β 1–40 fibrils can contain either parallel or antiparallel β-sheets. We report a protocol for producing structurally pure antiparallel D23N-A β 1–40 fibril samples and a series of solid state nuclear magnetic resonance and electron microscopy measurements that lead to a specific model for the antiparallel D23N-A β 1–40 fibril structure. This model reveals how both parallel and antiparallel cross-β structures can be constructed from similar peptide monomer conformations and stabilized by similar sets of interactions, primarily hydrophobic in nature. We find that antiparallel D23N-A β 1–40 fibrils are thermodynamically metastable with respect to conversion to parallel structures, propagate less efficiently than parallel fibrils in seeded fibril growth, and therefore must nucleate more efficiently than parallel fibrils in order to be observable. Experiments in neuronal cell cultures indicate that both antiparallel and parallel D23N-A β 1–40 fibrils are cytotoxic. Thus, our antiparallel D23N-A β 1–40 fibril model represents a specific “toxic intermediate” in the aggregation process of a disease-associated Aβ mutant." @default.
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• W2017684135 date "2012-03-08" @default.
• W2017684135 modified "2023-10-11" @default.
• W2017684135 title "Antiparallel β-sheet architecture in Iowa-mutant β-amyloid fibrils" @default.
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• W2017684135 doi "https://doi.org/10.1073/pnas.1111305109" @default.
• W2017684135 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3311365" @default.
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