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How Hierarchical Interactions Make Membraneless Organelles Tick Like Clockwork.

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Trends in Biochemical Sciences
|January 23, 2021
PubMed
Summary

Biomolecular condensates function best when the forces driving them have varied strengths. This balance of strong and weak interactions ensures both structural integrity and dynamic adaptability for optimal cellular roles.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Biomolecular condensates are crucial for diverse cellular functions.
  • The properties of these condensates are determined by the interactions that drive their formation.

Purpose of the Study:

  • To propose that optimal condensate functionality relies on a wide range of interaction affinities.
  • To explore the interplay between strong and weak interactions in various biological systems.

Main Methods:

  • Review and analysis of existing literature on biomolecular condensates.
  • Description of illustrative examples including the nucleolus, SPOP/DAXX, polySUMO/polySIM, chromatin, and stress granules.
  • Focus on hierarchical assembly motifs.

Main Results:

  • Strong interactions provide specificity but risk kinetic arrest.
  • Weak interactions allow dynamics but lack sufficient structural restriction.
  • Condensate functionality is optimized by a combination of both strong and weak interactions.

Conclusions:

  • A wide spectrum of interaction affinities is key for efficient condensate function.
  • Hierarchical assembly, where weak interactions drive the condensation of structurally defined units, is a common motif.
  • This balance enables both specificity and dynamism essential for cellular processes.