Interaction between soluble Aβ-(1-40) monomer and Aβ-(1-42) fibrils probed by paramagnetic relaxation enhancement

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Abstract

The most common isoforms of amyloid-β (Aβ) proteins are composed of 40 or 42 amino acid residues. While Aβ-(1-40) is the predominant species, Aβ-(1-42) is more fibrillogenic and neurotoxic, suggesting that Aβ-(1-42) plays a critical role in the initiation of amyloid fibril formation. We investigated the mechanisms by which soluble Aβ-(1-40) associates with preformed Aβ-(1-42) seeds. A paramagnetic relaxation enhancement analysis showed that the Aβ-(1-40) monomer and Aβ-(1-42) seed interact via their C-terminal region in a parallel fashion, and the N-terminal part does not to contribute to the interaction. Structured summary of protein interactions: A beta-(1-40) and A beta-(1-42) bind by fluorescence technology (View interaction) A beta-(1-42) and A beta-(1-40) bind by nuclear magnetic resonance (View interaction). © 2013 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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Yamaguchi, T., Matsuzaki, K., & Hoshino, M. (2013). Interaction between soluble Aβ-(1-40) monomer and Aβ-(1-42) fibrils probed by paramagnetic relaxation enhancement. FEBS Letters, 587(6), 620–624. https://doi.org/10.1016/j.febslet.2013.02.008

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