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Theory of Weakly Polydisperse Cytoskeleton Filaments
Vadim Warshavsky1, Marcelo Marucho1
1Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, TX 78249, USA.
Polymers
|May 28, 2022
Summary
This study introduces a new theory for cytoskeleton filaments, modeling their dynamic behavior and interactions. The findings help understand how these essential cellular structures form and function in different environments.
Area of Science:
- Biophysics
- Cell Biology
- Polymer Physics
Background:
- Cytoskeleton filaments dynamically change conformation, crucial for eukaryotic cell functions.
- Conventional biopolymer theories are insufficient for cytoskeleton filaments due to their polyelectrolyte and mechanical properties.
Purpose of the Study:
- Introduce a novel density functional theory for polydisperse, semiflexible cytoskeleton filaments.
- Account for polymerization kinetics, filament distributions, and electrostatic interactions.
Main Methods:
- Developed a novel density functional theory.
- Modeled equilibrium polymerization kinetics, length and orientation distributions.
- Included electrostatic interactions between filaments and electrolytes.
Main Results:
- Characterized thermodynamic properties of actin filaments in electrolyte solutions.
- Calculated free energy, pressure, chemical potential, and second virial coefficient.
- Generated a phase diagram for actin filaments and compared it with experimental data.
Conclusions:
- The novel theory accurately models cytoskeleton filament behavior.
- Provides insights into filament polymerization in various cellular compartments.
- Offers a framework for understanding thermodynamic properties and phase behavior.
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