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Spatial Separation of Molecular Conformers and Clusters
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Spatially non-uniform condensates emerge from dynamically arrested phase separation.

Nadia A Erkamp1, Tomas Sneideris1, Hannes Ausserwöger1

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Living cells use phase separation to form biomolecular condensates with complex internal structures. This study reveals that dynamically arrested phase transitions, not just thermodynamics, drive the formation of these unique, multi-compartment condensates.

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Area of Science:

  • Cell biology
  • Biophysics
  • Biochemistry

Background:

  • Biomolecular condensates form via phase separation, organizing cellular components.
  • Many condensates exhibit complex internal structures with distinct sub-compartments.
  • Some condensates contain regions depleted of the primary biopolymers.

Purpose of the Study:

  • To investigate the mechanisms behind the formation of complex, multi-compartment biomolecular condensates.
  • To explore the role of phase transitions in creating heterogeneous condensate structures.
  • To understand how kinetic factors influence condensate internal organization.

Main Methods:

  • Investigated phase separation dynamics in vitro.
  • Utilized models of dynamically arrested phase transitions.
  • Analyzed the effects of compositional changes and response times on condensate formation.

Main Results:

  • Demonstrated that double-emulsion condensates arise from dynamically arrested phase transitions.
  • Showed that a combination of compositional change and slow response can nucleate biopolymer-poor droplets.
  • Identified kinetic, rather than purely thermodynamic, forces driving complex condensate architecture.

Conclusions:

  • Complex internal architectures in biomolecular condensates can emerge from kinetic processes.
  • This work provides insights into the formation of heterogeneous condensates.
  • Offers a framework for controlling condensate structure in biological systems and in vitro.