Evidence for the Binding of Phosphate Ion to the C-Terminus Region in Aβ1-40 Using Heteronuclear NMR Analyses

Author(s): Makiko Nagata-Uchiyama, Yoshito Abe, Akira Monji, Shigenobu Kanba, Tadashi Ueda.

Journal Name: Protein & Peptide Letters

Volume 17 , Issue 2 , 2010

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Abstract:

Amyloid fibril formation of amyloid beta peptide 1-40 (Aβ 1-40) was reported to be retarded in the presence of 150mM phosphate buffer at pH 7 [Monji, Ustumi, Ueda, Imoto, Yoshida, Hashioka, Tashiro and Tashiro, J. Neurochemistry, 77, 1425-1432 (2007)]. In order to elucidate the reason why phosphate ion retards the amyloid fibril formation, we examined the preferential binding sites of phosphate ion to Aβ 1-40 using chemical shift perturbation analysis of heteronuclear NMR. In titration analysis of 15N-labeled Aβ1-40 in the presence of 150 mM phosphate ion or 150 mM chloride ion, we identified the residues affected by these ions in Aβ 1-40. As a result, we found the tendency that phosphate ion preferentially bound to some residues located on the C-terminus region where the region was reported to be the potential β-strand region in Aβ1-40. Therefore, we suggested that phosphate ions interacted with the potential β-strand region in Aβ1-40 to be hard to form β-sheet in Aβ 1-40, resulting in retardation of the amyloid fibril formation.

Keywords: Alzheimer's disease, amyloid beta peptide 1-40, chemical shift perturbation analysis, heteronuclear NMR, phosphate ion

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Article Details

VOLUME: 17
ISSUE: 2
Year: 2010
Page: [176 - 180]
Pages: 5
DOI: 10.2174/092986610790226058
Price: $58

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