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Probing Inhomogeneous Diffusion in the Microenvironments of Phase-Separated Polymers under Confinement.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Biomolecular condensates, formed via liquid-liquid phase separation, are increasingly recognized as vital cellular components.
  • Their structural organization and biophysical properties, essential for function, remain poorly understood, especially at in vivo scales.
  • Existing in vitro studies often use condensates much larger than those found within cells.

Purpose of the Study:

  • To investigate the structural organization and biophysical properties of biomolecular condensates at physiologically relevant, in vivo-like sizes.
  • To explore the dynamics of probe particles within confined condensates and relate them to condensate size and composition.

Main Methods:

  • Utilized confinement microscopy to visualize and control the size of biomolecular condensates.
  • Created specific confinement length scales mimicking cellular environments.
  • Employed probe particle diffusion measurements to analyze internal dynamics.

Main Results:

  • Observed anomalous diffusion of probe particles within confined condensates.
  • Detected heterogeneous dynamics in both PEG/dextran and ribonucleoprotein (RNP) condensates.
  • Proposed a hopping diffusion mechanism to explain the non-Gaussian dynamics.
  • Found that probe particle diffusion in dextran-rich condensates, but not RNP condensates, is dependent on condensate size.

Conclusions:

  • Confinement microscopy enables the study of biomolecular condensates at biologically relevant scales.
  • Anomalous diffusion and heterogeneous dynamics suggest complex internal organization and transport mechanisms within condensates.
  • Condensate size can influence internal dynamics, particularly in certain compositions like dextran-rich systems.