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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Diversity of kinetic pathways in amyloid fibril formation.
Journal of Chemical Physics 2009 September 22
The kinetics of peptide oligomerization was investigated using Langevin Dynamics simulations and a coarse-grained peptide model. The simulations show a rich diversity of aggregation pathways, modulated by the beta-sheet propensity (flexibility) of the peptide. Aggregation into amyloidlike fibrils occurs via three main mechanisms: (i) formation of fibrils directly from the assembly of early ordered oligomers, (ii) fibril formation via the formation of on-pathway, nonfibrillar aggregates high in beta-sheet content, and (iii) formation of amorphous aggregates followed by reorganization to beta-sheet aggregates and to fibrils. beta-sheet, nonfibrillar aggregates also appeared as long-lived, "off-pathway" end-product species.
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