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

Yamaguchi T., Matsuzaki K., Hoshino M.

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.

FEBS Lett. 587:620-624(2013) [PubMed] [Europe PMC]