Spatial Cytoskeleton Organization Supports Targeted Intracellular Transport

Area of Science:

• Cell Biology
• Biophysics

Background:

• Intracellular cargo transport relies on molecular motors moving along cytoskeletal tracks.
• The organization of the cytoskeleton, including microtubules and the actin cortex, influences transport efficiency.
• Cells employ complex search strategies for cargo delivery and molecular interactions.

Purpose of the Study:

• To analyze the efficiency of intracellular search strategies.
• To model random velocity with intermittent arrest states for cargo transport.
• To evaluate transport efficiency for narrow escape, reaction, and reaction-escape problems.

Main Methods:

• Formulation of a random velocity model with intermittent arrest states.
• Evaluation of efficiency using mean first passage times.
• Analysis of three distinct intracellular transport tasks.

Main Results:

• The interplay between cytoskeleton organization and motor performance creates inhomogeneous search strategies.
• Cells can achieve efficient search strategies through specific spatial cytoskeleton organization.
• A narrow actin cortex is more economical than a cell body with random filaments for efficient transport.

Conclusions:

• Cells employ optimized, intermittent search strategies for intracellular transport.
• Spatial organization of the cytoskeleton is key to efficient cargo delivery and molecular interactions.
• Economical cytoskeleton structures facilitate efficient cellular functions.