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Micromanipulation Techniques Allowing Analysis of Morphogenetic Dynamics and Turnover of Cytoskeletal Regulators

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Published on: May 12, 2018

Modeling cytoskeletal traffic: an interplay between passive diffusion and active transport.

Izaak Neri¹, Norbert Kern, Andrea Parmeggiani

¹Laboratoire Charles Coulomb UMR 5221, Université Montpellier 2, F-34095 Montpellier, France.

Physical Review Letters

|March 19, 2013

Summary

We modeled active motor protein transport using a network exclusion process. Different exchange rates create distinct matter distribution regimes, from network-wide to local.

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Area of Science:

Statistical Mechanics
Biophysics
Soft Matter Physics

Background:

Active motor proteins move along cytoskeletal networks, crucial for intracellular transport.
Cytoplasmic diffusion influences motor protein behavior, creating complex dynamics.

Purpose of the Study:

To model active motor protein transport on a network with cytoplasmic diffusion.
To investigate how network topology and exchange rates affect matter distribution.

Main Methods:

Utilized the totally asymmetric simple exclusion process with Langmuir kinetics on a network.
Introduced effective rate diagrams to analyze transport regimes and network complexity.

Main Results:

Identified three steady-state transport regimes: network scale, segment scale, and site scale.
Observed strong density heterogeneities at low exchange rates, requiring network topology consideration.
Found transport decoupling at moderate rates, governed by single segments and local topology.
Noted dominance of homogeneous Langmuir process at very high exchange rates.

Conclusions:

Network topology and exchange rates dictate matter distribution in active transport systems.
Developed a generic framework to understand excluded volume processes on complex networks.
The single-segment phase diagram offers an intuitive approach to analyzing complex network dynamics.