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Published on: July 19, 2022
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PEG-mCherry interactions beyond classical macromolecular crowding
Liam Haas-Neill1,2, Khalil Joron3, Eitan Lerner3,4
1Department of Physics, University of Toronto, Toronto, Ontario, Canada.
Protein Science : a Publication of the Protein Society
|February 19, 2025
Summary
Polyethylene glycol (PEG) crowding induces specific structural changes in the fluorescent protein mCherry. These PEG-protein interactions, revealed by simulations and experiments, impact mCherry dynamics and fluorescence.
Area of Science:
- Biophysics
- Structural Biology
- Computational Biology
Background:
- Cellular environments are crowded, affecting biomolecular behavior.
- Predicting protein-crowder interactions remains a challenge.
Purpose of the Study:
- To investigate polyethylene glycol (PEG)-induced crowding effects on the fluorescent protein mCherry.
- To characterize specific PEG-mCherry interactions and their impact on protein structure and dynamics.
Main Methods:
- Molecular dynamics simulations.
- Fluorescence-based experiments, including fluorescence correlation spectroscopy.
- Analysis of protein structure, dynamics, and fluorescence lifetimes.
Main Results:
- Identified specific PEG-induced structural and dynamical changes in mCherry.
- Observed PEG molecules binding to surface-exposed residues.
- Detected PEG-induced aggregation and altered fluorescence lifetimes of mCherry.
Conclusions:
- Specific PEG-mCherry interactions influence protein structure, dynamics, and aggregation.
- Crowder-protein soft interactions are crucial for understanding crowding effects.
- Findings enhance the understanding of macromolecular crowding in biological systems.
