Abstract
Synthetic peptides corresponding to the soluble Alzheimerβ-protein, i.e., β1–40 and β6-25, were utilized to investigate the association of aluminum using low-field27Al nuclear magnetic resonance (NMR) spectroscopy and reversed-phase high-performance liquid chromatography (RP-HPLC). Addition of β1-40 or β6-25 to aqueous Al3+ gives rise to a27Al NMR signal corresponding to the association of Al3+ with the peptides; this effect is not easily reversed by EDTA. Based on the relative intensity of the Al3+-peptide signal between pH 4 and 6, there are at least 4 Al3+ ions associated with each peptide molecule. Microheterogeneity is observed with RP-HPLC on incubating solutions of Al3+ with β1-40 and β6-25. The27Al NMR spectra of chromatographically pure fractions of β1-40 and β6-25 indicate that the peptide-associated Al3+ is released below pH 3.5. We propose that soluble β1-40 provides an anchor for Al3+ to bind, eventually leading to an increased deposition of amyloid in the Alzheimer brain.
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Vyas, S.B., Duffy, L.K. Interaction of synthetic Alzheimerβ-protein-derived analogs with aqueous aluminum: A low-field27Al NMR investigation. J Protein Chem 14, 633–644 (1995). https://doi.org/10.1007/BF01886902
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DOI: https://doi.org/10.1007/BF01886902