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4D Imaging of Protein Aggregation in Live Cells
08:59

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Published on: April 5, 2013

Cellular strategies for regulating functional and nonfunctional protein aggregation.

Jörg Gsponer1, M Madan Babu

  • 1Centre for High-Throughput Biology, Department of Biochemistry and Molecular Biology, University of British Columbia, East Mall, Vancouver V6T 1Z4, Canada. gsponer@chibi.ubc.ca

Cell Reports
|November 22, 2012
PubMed
Summary

Cellular systems carefully control aggregation-prone proteins, reducing their synthesis and increasing turnover. This strategy prevents harmful protein aggregation while maintaining beneficial protein assemblies.

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Area of Science:

  • Cellular biology
  • Molecular biology
  • Biochemistry

Background:

  • Protein aggregation is increasingly recognized for its dual role, being both detrimental and functional within cells.
  • Understanding how cells manage the risks and benefits of protein aggregation is crucial for cellular health.

Purpose of the Study:

  • To investigate the cellular mechanisms that regulate aggregation-prone proteins.
  • To elucidate how cells balance the harmful and beneficial effects of protein aggregation.

Main Methods:

  • Comparative analysis of transcriptional, translational, and degradation controls for aggregation-prone versus non-aggregation-prone proteins.
  • Examination of genetic modulators influencing protein aggregation phenotypes.
  • Assessment of the impact of overexpression on genes encoding aggregation-prone proteins.

Main Results:

  • Aggregation-prone proteins exhibit distinct regulatory controls, leading to lower synthesis, reduced abundance, and higher turnover rates.
  • Genes modulating aggregation phenotypes are linked to expression homeostasis.
  • Overexpression of genes encoding aggregation-prone proteins is often detrimental.
  • These regulatory trends are conserved across evolution.

Conclusions:

  • Cells employ specific strategies to modulate the availability of aggregation-prone proteins, maintaining concentrations below aggregation thresholds.
  • Cellular mechanisms shift the equilibrium of protein forms to prevent unwanted aggregation and control functional assemblies, consistent with Le Chatelier's principle.