Int. J. Mol. Sci. 2012, 13(5), 5324-5337; doi:10.3390/ijms13055324
Article

Aβ-40 Y10F Increases βfibrils Formation but Attenuates the Neurotoxicity of Amyloid-β Peptide

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Received: 11 March 2012; in revised form: 11 April 2012 / Accepted: 23 April 2012 / Published: 25 April 2012
(This article belongs to the Special Issue Molecular Mechanisms of Organ-Specific Toxicity)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Alzheimer’s disease (AD) is characterized by the abnormal aggregation of amyloid-β peptide (Aβ) in extracellular deposits known as senile plaques. The tyrosine residue (Tyr-10) is believed to be important in Aβ-induced neurotoxicity due to the formation of tyrosyl radicals. To reduce the likelihood of cross-linking, here we designed an Aβ-40 analogue (Aβ-40 Y10F) in which the tyrosine residue was substituted by a structurally similar residue, phenylalanine. The aggregation rate was determined by the Thioflavin T (ThT) assay, in which Aβ-40 Y10F populated an ensemble of folded conformations much quicker and stronger than the wild type Aβ. Biophysical tests subsequently confirmed the results of the ThT assay, suggesting the measured increase of β-aggregation may arise predominantly from enhancement of hydrophobicity upon substitution and thus the propensity of intrinsic β-sheet formation. Nevertheless, Aβ-40 Y10F exhibited remarkably decreased neurotoxicity compared to Aβ-40 which could be partly due to the reduced generation of hydrogen peroxide. These findings may lead to further understanding of the structural perturbation of Aβ to its fibrillation.
Keywords: Alzheimer’s disease; amyloid-β peptide; βfibrils; neurotoxicity
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MDPI and ACS Style

Dai, X.; Chang, P.; Liu, W.; Xu, K.; Sun, Y.; Zhu, S.; Jiang, Z. Aβ-40 Y10F Increases βfibrils Formation but Attenuates the Neurotoxicity of Amyloid-β Peptide. Int. J. Mol. Sci. 2012, 13, 5324-5337.

AMA Style

Dai X, Chang P, Liu W, Xu K, Sun Y, Zhu S, Jiang Z. Aβ-40 Y10F Increases βfibrils Formation but Attenuates the Neurotoxicity of Amyloid-β Peptide. International Journal of Molecular Sciences. 2012; 13(5):5324-5337.

Chicago/Turabian Style

Dai, Xueling; Chang, Ping; Liu, Wenjuan; Xu, Ke; Sun, Yaxuan; Zhu, Shigong; Jiang, Zhaofeng. 2012. "Aβ-40 Y10F Increases βfibrils Formation but Attenuates the Neurotoxicity of Amyloid-β Peptide." Int. J. Mol. Sci. 13, no. 5: 5324-5337.

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