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Immobilization of homogeneous monomeric, oligomeric and fibrillar A? species for reliable SPR measurements.


ABSTRACT: There is strong evidence that the amyloid-beta peptide (A?) plays a central role in the pathogenesis of Alzheimer's disease (AD). In this context, a detailed quantitative description of the interactions with different A? species is essential for characterization of physiological and artificial ligands. However, the high aggregation propensity of A? in concert with its susceptibility to structural changes due to even slight changes in solution conditions has impeded surface plasmon resonance (SPR) studies with homogeneous A? conformer species. Here, we have adapted the experimental procedures to state-of-the-art techniques and established novel approaches to reliably overcome the aforementioned challenges. We show that the application of density gradient centrifugation (DGC) for sample purification and the use of a single chain variable fragment (scFv) of a monoclonal antibody directed against the amino-terminus of A? allows reliable SPR measurements and quality control of the immobilized A? aggregate species at any step throughout the experiment.

SUBMITTER: Frenzel D 

PROVIDER: S-EPMC3940443 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Immobilization of homogeneous monomeric, oligomeric and fibrillar Aβ species for reliable SPR measurements.

Frenzel Daniel D   Glück Julian M JM   Brener Oleksandr O   Oesterhelt Filipp F   Nagel-Steger Luitgard L   Willbold Dieter D  

PloS one 20140303 3


There is strong evidence that the amyloid-beta peptide (Aβ) plays a central role in the pathogenesis of Alzheimer's disease (AD). In this context, a detailed quantitative description of the interactions with different Aβ species is essential for characterization of physiological and artificial ligands. However, the high aggregation propensity of Aβ in concert with its susceptibility to structural changes due to even slight changes in solution conditions has impeded surface plasmon resonance (SPR  ...[more]

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