Characterization of copper interactions with Alzheimer amyloid beta peptides: Identification of an attomolar-affinity copper binding site on amyloid beta 1-42

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Cu and Zn have been shown to accumulate in the brains of Alzheimer's disease patients. We have previously reported that Cu2+ and Zn2+ bind amyloid beta (A beta), explaining their enrichment in plaque pathology. Here we detail the stoichiometries and binding affinities of multiple cooperative Cu2+-binding sites on synthetic A beta 1-40 and A beta 1-42. We have developed a ligand displacement technique (competitive metal capture analysis) that uses metal-chelator complexes to evaluate metal ion binding to A beta, a notoriously self-aggregating peptide. This analysis indicated that there is a very-high-affinity Cu2+-binding site on A beta 1-42 (log K-app = 17.2) that mediates peptide precipitation and that the tendency of this peptide to self-aggregate in aqueous solutions is due to the presence of trace Cu2+ contamination (customarily similar to 0.1 mu M). In contrast, A beta 1-40 has much lower affinity for Cu2+ at this site (estimated log K-app = 10.3), explaining why this peptide is less self-aggregating. The greater Cu2+-binding affinity of A beta 1-42 compared with A beta 1-40 is associated with significantly diminished negative cooperativity, The role of trace metal contamination in inducing A beta precipitation was confirmed by the demonstration that A beta peptide (10 mu M) remained soluble for 5 days only in the presence of high-affinity Cu2+-selective chelators.
Publisher
Wiley-Blackwell
Issue Date
2000-09
Language
English
Article Type
Article
Keywords

A-BETA; CEREBROSPINAL-FLUID; TRACE-ELEMENTS; HYDROGEN-PEROXIDE; SERUM ZINC; DISEASE; BRAIN; PROTEIN; AGGREGATION; IMBALANCES

Citation

JOURNAL OF NEUROCHEMISTRY, v.75, no.3, pp.1219 - 1233

ISSN
0022-3042
DOI
10.1046/j.1471-4159.2000.0751219.x
URI
http://hdl.handle.net/10203/69268
Appears in Collection
BS-Journal Papers(저널논문)
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