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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
Published on: July 19, 2022
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Modulating internal transition kinetics of responsive macromolecules by collective crowding
Upayan Baul1, Nils Göth1, Michael Bley1
1Applied Theoretical Physics-Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany.
The Journal of Chemical Physics
|January 1, 2022
Summary
Molecular crowding and packing regulate biological processes. This study shows how spatial packing of responsive macromolecules collectively tunes their internal switching kinetics, with potential applications in self-regulation.
Area of Science:
- Biophysics
- Soft Matter Physics
- Chemical Biology
Background:
- Packing and crowding are key biological self-regulation mechanisms.
- Collective signaling influences molecular and cellular processes.
Purpose of the Study:
- To investigate how spatial packing affects the transition kinetics of internal molecular switches.
- To understand the role of self-crowding in modifying macromolecular switching.
Main Methods:
- Brownian dynamics simulations of Responsive Colloids.
- Modeling internal degrees of freedom (particle size) in a bimodal energy landscape.
- Analyzing self-consistent response to density fluctuations.
Main Results:
- Self-crowding tunes macromolecular switching kinetics over an order of magnitude.
- Demonstrated control over populations and transition times.
- Observed exponential scaling of kinetics with packing.
Conclusions:
- Spatial packing is a significant factor in regulating internal molecular switches.
- The findings align with theoretical predictions combining Kramers' and liquid state theories.
- This work provides insights into collective signaling and self-regulation in biological systems.
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