Membrane interactions and the effect of metal ions of the amyloidogenic fragment Abeta(25-35) in comparison to Abeta(1-42).

Abstract

Abeta(1-42) peptide, found as aggregated species in Alzheimer's disease brain, is linked to the onset of Alzheimer's disease. Many reports have linked metals to inducing Abeta aggregation and amyloid plaque formation. Abeta(25-35), a fragment from the C-terminal end of Abeta(1-42), lacks the metal coordinating sites found in the full-length peptide and is neurotoxic to cortical cortex cell cultures. We report solid-state NMR studies of Abeta(25-35) in model lipid membrane systems of anionic phospholipids and cholesterol, and compare structural changes to those of Abeta(1-42). When added after vesicle formation, Abeta(25-35) was found to interact with the lipid headgroups and slightly perturb the lipid acyl-chain region; when Abeta(25-35) was included during vesicle formation, it inserted deeper into the bilayer. While Abeta(25-35) retained the same beta-sheet structure irrespective of the mode of addition, the longer Abeta(1-42) appeared to have an increase in beta-sheet structure at the C-terminus when added to phospholipid liposomes after vesicle formation. Since the Abeta(25-35) fragment is also neurotoxic, the full-length peptide may have more than one pathway for toxicity.

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@article{Lau2007MembraneIA, title={Membrane interactions and the effect of metal ions of the amyloidogenic fragment Abeta(25-35) in comparison to Abeta(1-42).}, author={Tong-Lay Lau and John D. Gehman and John D Wade and Keyla A. Perez and Colin L. Masters and Kevin Jeffrey Barnham and Frances Separovic}, journal={Biochimica et biophysica acta}, year={2007}, volume={1768 10}, pages={2400-8} }