Preparation of pure populations of covalently stabilized amyloid β-protein oligomers of specific sizes.

Evidence suggests that amyloid β-protein (Aβ) oligomers may be seminal pathogenic agents in Alzheimer's disease (AD). If so, developing oligomer-targeted therapeutics requires an understanding of oligomer structure. This has been difficult due to the instability of these non-covalently associated Aβ assemblies. We previously used rapid, zero-length, in situ chemical cross-linking to stabilize oligomers of Aβ40. These enabled us to isolate pure, stable populations of dimers, trimers, and tetramers and to determine their structure-activity relationships. However, equivalent methods applied to Aβ42 did not produce stable oligomers. We report here that the use of an Aβ42 homologue, [F10, Y42]Aβ42, coupled with sequential denaturation/dissociation and gel electrophoresis procedures, provides the means to produce highly pure, stable populations of oligomers of sizes ranging from dimer through dodecamer that are suitable for structure-activity relationship determination. Copyright © 2016 Elsevier Inc. All rights reserved.

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Eric Y Hayden, Joseph L Conovaloff, Ashley Mason, Gal Bitan, David B Teplow. Preparation of pure populations of covalently stabilized amyloid β-protein oligomers of specific sizes. Analytical biochemistry. 2017 Feb 01;518:78-85

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PMID: 27810329

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