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Related Experiment Video

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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Membrane surfaces regulate assembly of ribonucleoprotein condensates.

Wilton T Snead1, Ameya P Jalihal1, Therese M Gerbich1

  • 1Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

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Cellular condensates, like those made by Whi3 protein, are controlled by membrane interactions. Membrane association limits condensate size by balancing protein concentration and diffusion.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Biomolecular condensates are crucial for cellular organization, but mechanisms controlling their size and position remain unclear.
  • Cells often contain small condensates that resist coarsening, despite their tendency to fuse.

Purpose of the Study:

  • To investigate how membrane association influences the size of ribonucleoprotein condensates.
  • To understand the biophysical principles governing condensate size control in cells.

Main Methods:

  • Studied Whi3 ribonucleoprotein condensates and their interaction with the endoplasmic reticulum.
  • Utilized in vitro reconstitution to analyze membrane-driven condensation and size arrest.
  • Investigated the roles of protein concentration and molecular diffusion in limiting condensate size.

Main Results:

  • Membrane recruitment promotes Whi3 condensation under physiological conditions.
  • Reconstituted condensates rapidly arrest in size, mirroring cellular observations.
  • Identified a trade-off between membrane-enhanced protein concentration (favoring condensation) and reduced diffusion (restricting coarsening).

Conclusions:

  • Membrane association is a key factor in controlling biomolecular condensate size.
  • The biophysical properties of lipid bilayers likely play a critical role in regulating condensate dimensions within cells.
  • This mechanism provides insight into how cells maintain diverse condensate sizes.