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Condenzymes: Biomolecular condensates with inherent catalytic activities.

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Summary

Condensates formed by intrinsically disordered proteins (IDPs) can catalyze chemical reactions like ATP hydrolysis, a function not inherent to the proteins themselves. This emergent catalytic activity arises from the unique electrochemical environments created during phase separation.

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Biological WaterBiomolecular condensatesCondenzymesElectrochemistryInherent catalytic functionInterfacePhase transition

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Biophysics

Background:

  • Intrinsically disordered proteins (IDPs) lack defined structures but can form dynamic condensates.
  • Enzyme-like catalytic activity is typically associated with specific protein structures, not disordered proteins.

Purpose of the Study:

  • To investigate the potential for IDP condensates to exhibit catalytic activity.
  • To understand the mechanism behind this emergent catalysis.
  • To explore the applications of such catalytic condensates.

Main Methods:

  • Formation and characterization of IDP condensates.
  • Assaying the catalytic activity of condensates on adenosine triphosphate (ATP) hydrolysis.
  • Investigating the electrochemical properties at condensate interfaces.
  • Designing IDP sequences to tune condensate properties.
  • Incorporating synthetic condensates into live cells.

Main Results:

  • IDP condensates exhibit catalytic activity for diverse hydrolysis reactions, including the complete breakdown of ATP into adenine and carbohydrates.
  • This catalysis is driven by electrochemical environments and electric fields at condensate interfaces, a consequence of phase separation.
  • Condensate catalysis differs from natural ATPases, which only perform dephosphorylation.
  • Catalytic activity can be modulated by tuning condensate properties through sequence design.
  • Synthetic condensates activated cellular transcriptional circuits dependent on hydrolysis products.

Conclusions:

  • Phase separation of IDPs can lead to emergent catalytic functions.
  • Electrochemical properties at condensate interfaces are key to this catalysis.
  • IDP condensates offer a novel platform for enzyme-like catalysis with tunable properties.
  • These findings have implications for understanding cellular metabolic regulation and synthetic biology applications.