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Designing negative feedback loops in enzymatic coacervate droplets.

Nisha Modi1, Siwei Chen1, Imelda N A Adjei2

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Researchers created self-regulating catalytic droplets using enzyme-loaded coacervates. These droplets dissolve in response to their own enzymatic activity, offering a novel way to control droplet size through internal feedback mechanisms.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Materials Science

Background:

  • Membraneless organelles regulate cellular processes via biomolecular phase separation and enzymatic reactions.
  • In vitro models of these condensates are needed to understand self-regulation.
  • Complex coacervation offers a route to create such models.

Purpose of the Study:

  • To investigate a model system of self-regulating catalytic droplets.
  • To explore the feedback mechanism between enzymatic activity and phase separation.
  • To understand how droplet size influences this self-regulation.

Main Methods:

  • Complex coacervation of catalase enzyme with DEAE-dextran polyelectrolyte.
  • Formation of pH-responsive catalytic droplets.
  • Induction of droplet dissolution via hydrogen peroxide addition.
  • Analysis of reaction-diffusion dynamics and droplet size effects.

Main Results:

  • Catalase activity in droplets increased local pH upon hydrogen peroxide addition.
  • This pH change triggered droplet dissolution due to pH-responsive phase behavior.
  • Droplet size influenced the destabilizing effect of enzymatic reactions.
  • Larger droplets exhibited greater pH changes and enhanced dissolution.

Conclusions:

  • A negative feedback loop between pH-dependent phase separation and enzymatic reactions was demonstrated.
  • This feedback mechanism allows for self-regulation of catalytic droplets.
  • The findings provide a basis for controlling droplet size in biomolecular condensate models.