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Published on: February 17, 2019
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Impact of morphology on diffusive dynamics on curved surfaces
Remy Kusters1, Cornelis Storm1
1Department of Applied Physics and Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven, The Netherlands.
Summary
Substrate shape controls diffusion speed in biological systems. Varying geometry alters particle movement timescales without changing material properties, impacting cellular function and membrane protein behavior.
Area of Science:
- Biophysics
- Cell Biology
- Physical Chemistry
Background:
- Diffusive processes are crucial for cellular functions and transport.
- Curved substrates are increasingly used to study membrane protein behavior.
- Understanding diffusion on nonplanar surfaces is key for interpreting biological experiments.
Purpose of the Study:
- To analyze in-plane diffusion of particles on curved geometries.
- To investigate how substrate shape influences diffusion timescales.
- To explore both collective and single-particle diffusion measures.
Main Methods:
- Analytical and numerical analyses of diffusion.
- Modeling of in-plane diffusion on generic curved biological motifs.
- Consideration of concentration profile relaxation (collective) and particle escape rates/first passage times (single-particle).
Main Results:
- Substrate morphology significantly affects diffusion timescales.
- Exit rates from a domain are not solely determined by boundary size.
- Diffusion characteristics are sensitive to the specific shape of the substrate.
Conclusions:
- Nature utilizes substrate shape to regulate microenvironment diffusion dynamics.
- Altering substrate geometry provides a mechanism to control diffusion timescales without modifying intrinsic material properties.
- Findings are relevant for interpreting Fluorescence Recovery After Photobleaching (FRAP) and single-particle tracking experiments.
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