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Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

Published on: June 29, 2021

Protein aggregation in salt solutions.

Miha Kastelic¹, Yurij V Kalyuzhnyi², Barbara Hribar-Lee¹

¹Faculty of Chemistry and Chemical Technology, University of Ljubljana, 1000 Ljubljana, Slovenia;

Proceedings of the National Academy of Sciences of the United States of America

|May 13, 2015

Summary

This summary is machine-generated.

This study presents a theoretical model for reversible protein aggregation in salt solutions, accurately predicting protein behavior and liquid-liquid coexistence curves for lysozyme and crystallin proteins.

Keywords:

Hofmeister series phase separation protein aggregation

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Area of Science:

Biophysics
Physical Chemistry
Protein Science

Background:

Protein aggregation is a critical factor in various diseases and the stability of biologic drug formulations.
Understanding the mechanisms of reversible protein aggregation is essential for both therapeutic development and disease research.

Purpose of the Study:

To develop a robust theoretical model for reversible protein-protein aggregation in salt solutions.
To accurately predict the behavior of proteins, such as lysozyme and crystallin, under varying salt conditions.

Main Methods:

Utilized Wertheim's thermodynamic perturbation theory, modeling proteins as hard spheres with square-well-energy binding sites.
Applied the model to analyze liquid-liquid coexistence curves and cloud-point curves for specific protein solutions.

Main Results:

The model accurately reproduces liquid-liquid coexistence curves for lysozyme and γ IIIa-crystallin solutions.
Achieved good fits for cloud-point curves of lysozyme in different buffer-salt mixtures, correlating with salt type and concentration.
Successfully predicted coexistence curves, osmotic compressibilities, and second virial coefficients.

Conclusions:

The theoretical model provides a reliable framework for understanding reversible protein aggregation in salt solutions.
The findings have implications for predicting protein behavior in formulations and may be relevant to protein crystallization processes.