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Updated: May 27, 2025

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

Published on: July 19, 2022

PEG-mCherry interactions beyond classical macromolecular crowding.

Liam Haas-Neill^1,2, Khalil Joron³, Eitan Lerner^3,4

¹Department of Physics, University of Toronto, Toronto, Ontario, Canada.

Protein Science : a Publication of the Protein Society

|February 19, 2025

Summary

This summary is machine-generated.

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.

Keywords:

crowding fluorescence correlation spectroscopy fluorescent proteins intrinsically disordered regions molecular dynamics phase separation

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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.