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Membrane nanotube pearling restricted by confined polymers
Zengshuai Yan1, Shixin Li, Zhen Luo
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China. yuett@upc.edu.cn.
Soft Matter
|November 13, 2018
Summary
Confined polymers like DNA and proteins restrict membrane nanotube pearling by increasing energy costs. Longer, stiffer polymers are more effective at stabilizing these cellular transport channels.
Area of Science:
- Cellular Biology
- Biophysics
- Computational Biology
Background:
- Membrane nanotubes are crucial for intercellular transport.
- Nanotube pearling, a shape change, is observed in response to stimuli.
- The stability of membrane nanotubes remains a fundamental question.
Purpose of the Study:
- To investigate the role of confined polymers in maintaining membrane nanotube stability.
- To understand the mechanisms restricting nanotube pearling.
- To explore methods for manipulating tubular membrane structure dynamics.
Main Methods:
- Dissipative particle dynamics simulations.
- Free energy calculations.
- Force analysis.
Main Results:
- Confined polymers, including DNA, proteins, and actin filaments, restrict nanotube pearling.
- Pearling is thermodynamically unfavorable with longer, stiffer polymers due to increased bending energy costs.
- Dynamic simulations show polymers are repelled from shrinking regions, with longer polymers hindering pearling more effectively.
Conclusions:
- Confined polymers provide a mechanism for stabilizing membrane nanotubes.
- Polymer length and stiffness significantly influence nanotube stability.
- Findings supplement explanations for nanotube stability and offer new ways to study membrane dynamics.
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