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Area of Science:

  • Cellular biophysics
  • Molecular cell biology
  • Biochemistry

Background:

  • The cytoplasm is a crowded environment influencing cell function.
  • Stress triggers the formation of RNA protein (RNP) condensates like P-bodies and stress granules.
  • The impact of RNP condensate assembly on cytoplasmic biophysical properties is not well understood.

Approach:

  • Investigated the effect of stress-induced mRNA condensation on cytoplasmic diffusivity using microscopy.
  • Examined the role of increased mesoscale diffusivity in the formation of Q-bodies.
  • Utilized light-induced RNA condensation in synthetic systems to establish causality.

Key Points:

  • Polysome collapse and mRNA condensation increase mesoscale particle diffusivity during stress.
  • Enhanced diffusivity is essential for the formation of Q-bodies, which degrade misfolded peptides.
  • Similar cytoplasmic fluidization effects were observed in mammalian cells.

Conclusions:

  • RNA condensation, induced by stress or light, fluidizes the cytoplasm at the mesoscale.
  • Stress-induced translation inhibition and RNP condensate formation play a role in modulating cytoplasmic physical properties.
  • This modulation is vital for effective cellular stress response.