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We describe here an approach to the analysis of the A\u03b2 aggregation mechanism that uses A\u03b2-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\u03b2-polyQ hybrids, and by extension for full-length A\u03b2 peptides, in which a modular A\u03b2 C-terminal segment mediates rapid, non-nucleated formation of \u03b1-helical oligomers. The resulting high local concentration of tethered amyloidogenic segments within these \u03b1-oligomers facilitates transition to a \u03b2-oligomer population that, via further remodelling and\/or elongation steps, ultimately generates mature amyloid. Consistent with this mechanism, an engineered A\u03b2 C-terminal fragment delays aggregation onset by A\u03b2-polyglutamine peptides and redirects assembly of A\u03b2\n                    <jats:sub>42<\/jats:sub>\n                    fibrils.\n                  <\/jats:p>","DOI":"10.1038\/ncomms12419","type":"journal-article","created":{"date-parts":[[2016,8,22]],"date-time":"2016-08-22T05:40:17Z","timestamp":1471844417000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":62,"title":["Rapid \u03b1-oligomer formation mediated by the A\u03b2 C terminus initiates an amyloid assembly pathway"],"prefix":"10.1038","volume":"7","author":[{"given":"Pinaki","family":"Misra","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ravindra","family":"Kodali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saketh","family":"Chemuru","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7047-6539","authenticated-orcid":false,"given":"Karunakar","family":"Kar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronald","family":"Wetzel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,8,22]]},"reference":[{"key":"BFncomms12419_CR1","doi-asserted-by":"publisher","first-page":"759","DOI":"10.1038\/nrd4593","volume":"14","author":"YS Eisele","year":"2015","unstructured":"Eisele, Y. 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