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Membrane Diffusion Occurs by Continuous-Time Random Walk Sustained by Vesicular Trafficking.

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Cellular membrane diffusion is complex. This study reveals that membrane protein CD93 diffusion evolves over time due to membrane corrals and recycling, maintaining its distribution.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Dynamics

Background:

  • Cellular membrane diffusion is influenced by various factors across spatial and temporal scales.
  • Complex, non-Brownian diffusion in membranes is challenging to characterize, with membrane recycling's impact largely unexplored.

Purpose of the Study:

  • To investigate the diffusion dynamics of the plasma membrane protein CD93.
  • To elucidate the role of membrane corrals and recycling in regulating protein diffusion and distribution.

Main Methods:

  • Statistical analysis of single-particle tracking data for CD93.
  • Modeling diffusion using a continuous-time random walk with an aging process.

Main Results:

  • CD93 diffusion transitions from free to corralled over time.
  • Membrane corrals and an aging process accurately describe CD93 diffusion.
  • Selective endocytosis of corralled CD93 and exocytosis of free CD93 maintain diffusion and distribution.

Conclusions:

  • Ongoing membrane recycling is crucial for maintaining steady-state diffusion and heterogeneous distribution of plasma membrane proteins.
  • The study provides insights into biological and biophysical processes causing non-Brownian diffusion.
  • CD93 diffusion dynamics are regulated by a balance between diffusion, corralling, and membrane trafficking.