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Updated: Jul 13, 2025

Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain
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Condensate interfaces can accelerate protein aggregation.

Chang-Hyun Choi1, Daniel S W Lee1, David W Sanders1

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey.

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|October 14, 2023
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Summary
This summary is machine-generated.

Biomolecular condensates of p62/SQSTM1 protein accelerate the formation of mutant polyQ aggregates in neurodegenerative diseases. This process depletes free p62, ultimately suppressing further condensation and aggregate growth.

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Area of Science:

  • Neurodegenerative disease research
  • Biomolecular condensate physics
  • Protein aggregation mechanisms

Background:

  • Protein aggregates are hallmarks of neurodegenerative diseases.
  • p62/SQSTM1 protein binds and sequesters aberrant proteins, potentially via biomolecular condensates.
  • The role of p62 condensates in regulating pathological protein aggregation is not fully understood.

Purpose of the Study:

  • To investigate the physical mechanisms by which p62 condensates regulate mutant polyQ aggregation.
  • To elucidate the dynamic interplay between p62 condensation and aggregate formation in disease models.

Main Methods:

  • Utilized a light-inducible biomimetic condensate system.
  • Studied the interaction between p62 condensates and mutant polyQ aggregates.
  • Analyzed the effects of aggregate formation on p62 phase behavior and protein ubiquitination.

Main Results:

  • p62 condensates enhance the coarsening of mutant polyQ aggregates via interface-mediated sequestration.
  • This process accelerates the accumulation of polyQ into larger aggregates.
  • Large aggregates sequester polyubiquitinated proteins, depleting free p62 and suppressing further condensation.

Conclusions:

  • p62 condensates can accelerate pathological protein aggregation through interface-mediated coarsening.
  • A dynamic interplay exists between aggregate coarsening and regulatory protein phase behavior.
  • This interplay may contribute to the onset and progression of protein aggregation diseases.