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Catalytically Active Coacervates Sustained Out-of-Equilibrium.

Subhajit Bal1, Saurabh Gupta1, Chiranjit Mahato1

  • 1Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India.

Angewandte Chemie (International Ed. in English)
|April 14, 2025
PubMed
Summary

Researchers created active coacervates using simple molecules that mimic early cell-like structures. These self-assembling droplets maintain form via internal reactions, offering insights into the origins of life and active membraneless organelles.

Keywords:
Active coacervatesC─C bond formationLiquid–liquid phase separationNonequilibrium conditionsShort‐peptides

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Origin of Life Studies

Background:

  • Membraneless organelles in biology maintain structure via chemical reactions under nonequilibrium conditions.
  • Understanding the self-assembly and stability of early protocell models is crucial for origin of life research.

Purpose of the Study:

  • To synthesize and characterize active coacervates from minimal building blocks.
  • To investigate the role of intrinsic catalysis in maintaining coacervate stability under nonequilibrium conditions.
  • To explore the resemblance between these synthetic coacervates and natural membraneless organelles.

Main Methods:

  • Formation of coacervates from a mixture of a π-electron rich peptide, a positively charged aldehyde, and a cyclic ketone.
  • Utilizing dynamic covalent bonds for peptide-aldehyde conjugation and hydrophobic interactions for phase separation.
  • Employing aldol reactions catalyzed by the peptide's free amine to consume aldehyde, driving the system out of equilibrium.
  • Maintaining coacervate stability through continuous addition of precursors in an open system.

Main Results:

  • Active coacervates were successfully formed from the defined minimal building blocks.
  • The peptide's catalytic activity (via β-alanine) led to the depletion of aldehyde through aldol reactions, preventing coalescence.
  • Coacervates demonstrated enhanced spatial stability over extended periods when supplied with a continuous flux of precursors.
  • The observed behavior mimics the nonequilibrium dynamics of natural active membraneless organelles.

Conclusions:

  • Minimal chemical systems can spontaneously form active coacervates that resist coalescence through intrinsic catalytic processes.
  • These active coacervates serve as a model for understanding the self-organization and stability principles underlying early biological compartments.
  • The study provides a potential pathway for creating synthetic protocell-like structures with life-like properties.