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Many Light Touches Convey the Message.

James W Dennis1

  • 1Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue R988, Toronto, Ontario M5G 1X50, Canada; Department of Molecular Genetics and Department of Laboratory Medicine and Pathology, Department of Medicine, University of Toronto, Canada.

Trends in Biochemical Sciences
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Summary
This summary is machine-generated.

Natural selection favors complex protein networks with weak interactions and multivalency. These disordered proteins, modified by phosphorylation and ubiquitination, form dynamic cellular structures for precise signaling.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Systems Biology

Background:

  • Cellular processes rely on complex protein interactions.
  • Traditional models often emphasize precision and symmetry, which may not fully capture biological networks.
  • Proteins with low complexity (LC) and intrinsically disordered (ID) regions play crucial roles in cellular signaling.

Purpose of the Study:

  • To explore how natural selection favors networks characterized by weak interactions, multivalency, and LC/ID proteins.
  • To understand the role of post-translational modifications (PTMs) in forming dynamic protein complexes.
  • To elucidate the mechanisms by which these dynamic systems achieve specific and switch-like signaling behaviors.

Main Methods:

  • Analysis of protein interaction networks focusing on weak interactions and multivalency.
  • Investigation of the role of PTMs like phosphorylation and ubiquitination in protein complex formation.
  • Study of phase transitions and liquid-liquid phase separation in cellular signaling complexes.

Main Results:

  • Natural selection favors protein networks utilizing weak interactions, multivalency, and intrinsically disordered regions.
  • PTMs act as docking sites for multivalent adaptors, mediating the formation of soluble and membrane-associated complexes.
  • LC and ID regions facilitate phase transitions, leading to the formation of dynamic liquid droplets or membrane-tethered structures.

Conclusions:

  • Dynamic, disordered protein networks with weak interactions are crucial for cellular information flow.
  • PTMs and disordered regions enable complex, yet specific and timely, biological signaling through phase transitions.
  • These findings challenge traditional views favoring symmetry and precision, highlighting the importance of dynamic complexity in biological systems.