ArticleJournal of molecular biology2026
Brain-seeded 42-residue Amyloid-β Fibrils That Resemble Fibrils Directly Extracted From Alzheimer's Disease Brain Tissue.
Article in Journal of molecular biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Fibrils formed by the 42-residue amyloid-β peptide (Aβ42) are known to be polymorphic, with molecular conformations and supramolecular structures that depend on conditions of nucleation, growth, seeding, or other factors. Structural studies of Aβ42 fibrils that develop in human brain tissue have been based on two different approaches, either direct extraction and partial purification of fibrils from brain tissue for characterization by cryogenic electron microscopy (cryo-EM) or growth of fibrils in vitro from seeds in amyloid-containing brain tissue extracts for characterization by solid state nuclear magnetic resonance (ssNMR) or cryo-EM. To date, studies of brain-extracted and brain-seeded Aβ42 fibrils have produced qualitatively different sets of structures. Here we report structures of two new brain-seeded Aβ42 fibril polymorphs, derived from cortical tissue of an Alzheimer's disease (AD) patient, that share certain structural features with previously characterized polymorphs extracted from AD brain tissue. These structures contribute to our understanding of the relationships between brain-seeded and brain-extracted fibril structures and expand our understanding of the full range of polymorphism in amyloid-β fibrils.
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