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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Morphological development of beta(1-40) amyloid fibrils.
Experimental Neurology 1999 August
The Alzheimer's disease-related peptide beta(1-40) amyloid self-associates to form fibrils exhibiting a morphology characteristic of amyloidogenic proteins. The mechanism of this fibrillization process has yet to be fully elucidated. In this study we have immobilized the beta(1-40) amyloid to flat gold surfaces using thiol-based self-assembled monolayers. Atomic force microscopy reveals the presence of spherical units of beta(1-40) amyloid immediately following the initiation of fibrillization. Short fibrillar structures, termed nascent fibrils, which appear to be formed by the association of these units are also present at this time point. At later time points extended, branching networks of fibrils are observed. Some fibrils exhibit a more beaded appearance and greater axial periodicity than others. No nascent fibrils are seen to be present. We believe that these data identify an early fibril structure which could act as an intermediate in beta-amyloid fibrillization. The oligomeric units of which these nascent fibrils are comprised are also determined.
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