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What determines sub-diffusive behavior in crowded protein solutions?

Vijay Phanindra Srikanth Kompella1, Maria Carmen Romano2, Ian Stansfield3

  • 1Curtin Medical School, Curtin Health Innovation Research Institute, Curtin Institute for Data Science, Curtin University, Perth, Western Australia, Australia; Department of Physics, Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, United Kingdom.

Biophysical Journal
|December 11, 2023
PubMed
Summary
This summary is machine-generated.

Cellular macromolecular crowding significantly hinders molecule movement. Brownian dynamics simulations reveal excluded volume effects cause sub-diffusion via a cage effect, impacting cellular processes.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Computational Biology

Background:

  • Cells contain high concentrations of macromolecules (90-450 g/L), leading to macromolecular crowding.
  • Crowding reduces available space, causing excluded volume effects and altering molecular diffusion.

Purpose of the Study:

  • To characterize macromolecular diffusion under crowded conditions.
  • To elucidate the roles of transient complex formation and excluded volume effects in sub-diffusion.

Main Methods:

  • Brownian dynamics simulations were employed.
  • Diffusion of chymotrypsin inhibitor 2 in bovine serum albumin and lysozyme solutions (50-300 g/L) was simulated.
  • Interactions between protein molecules were manipulated to isolate effects.

Main Results:

  • Simulated diffusion coefficients align with experimental NMR data.
  • Sub-microsecond sub-diffusion is attributed to a cage effect from excluded volume.
  • Excluded volume effects were confirmed as the driver of sub-diffusive dynamics.

Conclusions:

  • Excluded volume effects, not just transient complexes, explain sub-diffusion in crowded cellular environments.
  • The cage effect provides a mechanism for altered diffusion dynamics.
  • Findings offer insights into diffusion-mediated effects of crowding on cellular functions.