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Updated: Mar 15, 2026

Quantifying the Binding Interactions Between CuII and Peptide Residues in the Presence and Absence of Chromophores
Published on: April 5, 2022
Copper Ion Binding Site in β-Amyloid Peptide.
Diana Yugay1,2, Dominic P Goronzy1,2, Lisa M Kawakami2
1California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.
Copper ions bind to specific histidine residues on beta-amyloid peptides, promoting the formation of beta-sheets crucial for Alzheimer's disease pathology. This binding site is key to understanding metal ion roles in neurodegeneration.
Area of Science:
- Neuroscience
- Biochemistry
- Materials Science
Background:
- Beta-amyloid aggregates are central to Alzheimer's disease pathogenesis.
- Metal ions like copper and zinc are implicated in Alzheimer's disease.
- The precise binding sites of metal ions on beta-amyloid peptides are not well understood.
Purpose of the Study:
- To investigate the interaction between copper ions (Cu2+) and a beta-amyloid peptide fragment (residues 1-16).
- To identify the specific binding site of copper on the beta-amyloid peptide.
- To elucidate the role of copper binding in peptide structural changes.
Main Methods:
- Scanning tunneling microscopy (STM) for atomic-level imaging.
- Circular dichroism (CD) spectroscopy for structural analysis.
- Surface-enhanced Raman spectroscopy (SERS) for molecular interaction studies.
Main Results:
- Copper ions induce the formation of beta-sheets in the beta-amyloid peptide fragment.
- STM imaging identified the copper binding site involving histidine residues His13 and His14.
- The binding of copper to His13 and His14 forms an interstrand histidine brace.
Conclusions:
- Copper binding to His13 and His14 stabilizes beta-sheet structures in beta-amyloid peptides.
- This copper-induced structural change is a critical step in Alzheimer's disease.
- Understanding these interactions provides insights into therapeutic strategies for Alzheimer's disease.
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