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Rapid ?-oligomer formation mediated by the A? C terminus initiates an amyloid assembly pathway #MMPMID27546208
Misra P; Kodali R; Chemuru S; Kar K; Wetzel R
Nat Commun 2016[]; 7 (ä): ä PMID27546208show ga
Since early oligomeric intermediates in amyloid assembly are often transient and difficult to distinguish, characterize and quantify, the mechanistic basis of the initiation of spontaneous amyloid growth is often opaque. We describe here an approach to the analysis of the A? aggregation mechanism that uses A?-polyglutamine hybrid peptides designed to retard amyloid maturation and an adjusted thioflavin intensity scale that reveals structural features of aggregation intermediates. The results support an aggregation initiation mechanism for A?-polyQ hybrids, and by extension for full-length A? peptides, in which a modular A? C-terminal segment mediates rapid, non-nucleated formation of ?-helical oligomers. The resulting high local concentration of tethered amyloidogenic segments within these ?-oligomers facilitates transition to a ?-oligomer population that, via further remodelling and/or elongation steps, ultimately generates mature amyloid. Consistent with this mechanism, an engineered A? C-terminal fragment delays aggregation onset by A?-polyglutamine peptides and redirects assembly of A?42 fibrils.