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Ion-Mediated Morphological Diversity in Protein Amyloid Systems
Hussein Chaaban1,2,3, Jijo J Vallooran1,2, Marco van de Weert1,2,3
1Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark.
The Journal of Physical Chemistry Letters
|April 15, 2022
Summary
Hofmeister ions control protein aggregation rates and the diverse shapes of amyloid-like structures. This reveals their crucial role in protein stability and biological function.
Area of Science:
- Biochemistry
- Materials Science
- Biophysics
Background:
- Salt ions significantly influence protein folding, stability, and self-assembly.
- Understanding these effects is crucial for amyloid-related diseases, drug development, and biomaterials.
Purpose of the Study:
- To investigate how Hofmeister ions affect protein aggregation kinetics.
- To determine if Hofmeister ions control the morphology of protein aggregates.
Main Methods:
- Studied aggregation reactions of human insulin and hen egg white lysozyme.
- Analyzed the impact of various Hofmeister ions on reaction rate constants.
- Characterized the resulting amyloid-like structures across different scales.
Main Results:
- Hofmeister ions were found to determine the rate constants for protein aggregation.
- These ions controlled the formation of diverse amyloid-like morphologies, from nano- to microscale.
- Morphology generation appears to result from a balance of colloidal and conformational stability, influenced by ion-specific effects.
Conclusions:
- Salt ions, specifically Hofmeister ions, are critical regulators of protein aggregation processes.
- These ions dictate both the speed and the structural diversity of amyloid-like aggregates.
- Controlling ion composition offers a powerful strategy for modulating protein aggregate functions.
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