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Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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Spatial control of irreversible protein aggregation.

Christoph Weber1, Thomas Michaels1, L Mahadevan2,3,4

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, United States.

Elife
|May 16, 2019
PubMed
Summary
This summary is machine-generated.

Liquid cellular compartments can control protein aggregation. Our model shows aggregates partition into these compartments, potentially confining harmful proteins.

Keywords:
nonephase separationphysics of living systemsprotein aggregationspatial regulation

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Area of Science:

  • Biophysics
  • Cell Biology
  • Chemical Kinetics

Background:

  • Liquid cellular compartments, such as condensates, are known to form in cells.
  • These compartments can influence protein aggregation, but the mechanisms are not fully understood.
  • Aberrant protein aggregation is linked to various diseases.

Purpose of the Study:

  • To investigate the mechanisms by which liquid compartments regulate protein aggregation.
  • To explore the spatial control of irreversible protein aggregation within these compartments.
  • To link physical conditions to aggregate partitioning in liquid compartments.

Main Methods:

  • Combining the kinetic theory of protein aggregation with liquid-liquid phase separation principles.
  • Developing a theoretical model to simulate aggregate behavior in the presence of liquid compartments.
  • Analyzing the feedback mechanisms driving aggregate nucleation and growth.

Main Results:

  • Protein aggregates strongly partition into liquid compartments, even with weak interactions.
  • A positive feedback loop involving nucleation and growth, sustained by phase equilibrium, drives aggregate partitioning.
  • The study identifies specific conditions that maximize aggregate partitioning into compartments.

Conclusions:

  • Liquid compartments can spatially confine protein aggregates through a biophysical mechanism.
  • This partitioning mechanism could be leveraged to sequester cytotoxic protein aggregates.
  • The findings suggest a general principle for controlling irreversible chemical reactions in biological systems.