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Managing Hyperosmotic Stress through Phase Separation.

Ivan Peran1, Nafiseh Sabri1, Tanja Mittag1

  • 1Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.

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Cells use liquid-liquid phase separation (LLPS) to manage ubiquitinated proteins during hyperosmotic stress. This process forms nuclear compartments that clear protein aggregates by recruiting proteasomes.

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Area of Science:

  • Cell biology
  • Biochemistry
  • Molecular biology

Background:

  • Ubiquitinated proteins can accumulate and form aggregates within cells.
  • Cellular stress conditions, such as hyperosmotic stress, can impact protein homeostasis.
  • Liquid-liquid phase separation (LLPS) is an emerging mechanism for cellular organization.

Purpose of the Study:

  • To investigate the role of LLPS in cellular response to ubiquitinated proteins under hyperosmotic stress.
  • To elucidate the mechanism by which nuclear compartments form and function in aggregate clearance.

Main Methods:

  • Induction of hyperosmotic stress in cellular models.
  • Observation and characterization of nuclear compartment formation using microscopy.
  • Analysis of protein recruitment, including ubiquitinated proteins and proteasomes, within these compartments.

Main Results:

  • Hyperosmotic stress triggers the formation of distinct liquid compartments within the nucleus.
  • These nuclear compartments effectively recruit ubiquitinated proteins.
  • Proteasomes are recruited to these compartments, leading to the clearance of protein aggregates.

Conclusions:

  • LLPS is a critical cellular response to manage ubiquitinated proteins under hyperosmotic stress.
  • The formation of nuclear liquid compartments facilitates proteasome-mediated aggregate clearance.
  • This study reveals a novel mechanism for maintaining protein homeostasis during cellular stress.