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Fibril formation from the amyloid-β peptide is governed by a dynamic equilibrium involving association and dissociation of the monomer

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Abstract

Here I review the molecular mechanisms by which water-soluble monomeric amyloid-β (Aβ) peptides are transformed into well-organized supramolecular complexes called amyloid fibrils. The mechanism of amyloid formation is considered theoretically on the basis of experimental results, and the structural and mechanistic similarities of amyloid fibrils to three-dimensional crystals are highlighted. A number of important results from the literature are described. These include the observation that a correct ratio of monomer association and dissociation rate constants is key for formation of well-organized amyloid fibrils. The dynamic nature of the amyloid-β structure is discussed, along with the possibly obligate requirement of the transient formation of a hairpin-like fold prior to its incorporation into amyloid fibrils. Many rounds of monomer association and dissociation events may be present during an apparently silent lag-period. Amongst these association/dissociation events, interaction between the C-terminal regions of the Aβ peptide seems to be more favored. Such association and dissociation events occurring in a “trial-and-error” fashion may be an important requirement for the formation of well-organized amyloid fibrils.

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  1. Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida-Shimoadachi, Sakyo-ku, Kyoto, 606-8501, Japan

    Masaru Hoshino

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  1. Masaru Hoshino
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Correspondence to Masaru Hoshino.

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Masaru Hoshino declares that he has no conflicts of interest.

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Hoshino, M. Fibril formation from the amyloid-β peptide is governed by a dynamic equilibrium involving association and dissociation of the monomer. Biophys Rev 9, 9–16 (2017). https://doi.org/10.1007/s12551-016-0217-7

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