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• W2023014768 startingPage "7365" @default.
• W2023014768 abstract "The deposition of fibrils and amorphous aggregates of transthyretin (TTR) in patient tissues is a hallmark of TTR amyloid disease, but the molecular details of amyloidogenesis are poorly understood. Tetramer dissociation is typically rate-limiting for TTR amyloid fibril formation, so we have used a monomeric variant of TTR (M-TTR) to study the mechanism of aggregation. Amyloid formation is often considered to be a nucleation-dependent process, where fibril growth requires the formation of an oligomeric nucleus that is the highest energy species on the pathway. According to this model, the rate of fibril formation should be accelerated by the addition of preformed aggregates or “seeds”, which effectively bypasses the nucleation step. Herein, we demonstrate that M-TTR amyloidogenesis at low pH is a complex, multistep reaction whose kinetic behavior is incompatible with the expectations for a nucleation-dependent polymerization. M-TTR aggregation is not accelerated by seeding, and the dependence of the reaction timecourse is first-order on the M-TTR concentration, consistent either with a dimeric nucleus or with a nonnucleated process where each step is bimolecular and essentially irreversible. These studies suggest that amyloid formation by M-TTR under partially denaturing conditions is a downhill polymerization, in which the highest energy species is the native monomer. Our results emphasize the importance of therapeutic strategies that stabilize the TTR tetramer and may help to explain why more than eighty TTR variants are disease-associated. The differences between amyloid formation by M-TTR and other amyloidogenic peptides (such as amyloid β-peptide and islet amyloid polypeptide) demonstrate that these polypeptides do not share a common aggregation mechanism, at least under the conditions examined thus far." @default.
• W2023014768 created "2016-06-24" @default.
• W2023014768 creator A5003810573 @default.
• W2023014768 creator A5073572665 @default.
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• W2023014768 date "2004-05-14" @default.
• W2023014768 modified "2023-09-27" @default.
• W2023014768 title "Transthyretin Aggregation under Partially Denaturing Conditions Is a Downhill Polymerization" @default.
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• W2023014768 doi "https://doi.org/10.1021/bi049621l" @default.
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