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Updated: Dec 29, 2025

Quantifying the Binding Interactions Between CuII and Peptide Residues in the Presence and Absence of Chromophores
Published on: April 5, 2022
Copper(II) and Amylin Analogues: A Complicated Relationship
Mawadda Alghrably1, Dorota Dudek2, Abdul-Hamid Emwas3
1Biological and Environmental Science and Engineering (BESE) , King Abdullah University of Science and Technology (KAUST) , 23955-6900 Thuwal , Saudi Arabia.
Copper ions (Cu2+) interact with pramlintide and rat amylin, potentially impacting protein aggregation relevant to diseases. Cu2+ binding affects pramlintide aggregation but not rat amylin.
Area of Science:
- Biochemistry
- Molecular Biology
- Medicinal Chemistry
Background:
- Protein aggregation is implicated in diseases like neurodegenerative disorders and type II diabetes.
- Metal ion complexation offers a strategy to inhibit protein aggregation by altering protein conformation.
- Understanding interactions between aggregating proteins and metal ions like copper (Cu2+) is crucial for drug discovery.
Purpose of the Study:
- To investigate the copper ion (Cu2+) coordination properties of pramlintide and rat amylin.
- To determine the effect of Cu2+ on the aggregation behavior of these amylin analogues.
Main Methods:
- Nuclear magnetic resonance (NMR)
- Circular dichroism (CD)
- Electron paramagnetic resonance (EPR)
- UV-visible spectroscopy
- Potentiometry
- Mass spectrometry
- Thioflavin T (ThT) aggregation assays
Main Results:
- Both pramlintide and rat amylin form stable 1:1 complexes with Cu2+ with similar binding affinities.
- Copper ions bind to the N-termini of both peptides, with His18 also serving as a binding site in pramlintide.
- Cu2+ influences the aggregation of pramlintide, but not rat amylin.
Conclusions:
- Pramlintide and rat amylin exhibit distinct responses to Cu2+-induced modulation of protein aggregation.
- The findings provide insights into the role of metal ions in regulating peptide aggregation, relevant for therapeutic strategies.
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