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Related Experiment Videos

Ramping up degradation for proliferation.

Jon M Huibregtse1, Andreas Matouschek1

  • 1Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, USA.

Nature Cell Biology
|January 29, 2016
PubMed
Summary

Researchers found that direct proteasome regulation occurs via DYRK2-mediated phosphorylation of the Rpt3 subunit. This phosphorylation enhances proteasome activity, offering new insights into protein degradation control.

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Locating Polyubiquitin Receptors on the 19S Regulatory Proteasome of <i>S. cerevisiae</i> by Cross-Linking Mass Spectrometry.

Journal of the American Society for Mass Spectrometry·2025

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Proteasome-mediated protein degradation is crucial for cellular function.
  • Regulation is traditionally understood to occur at the substrate polyubiquitylation level.

Purpose of the Study:

  • To investigate direct regulatory mechanisms of proteasome activity.
  • To explore the role of DYRK2 in proteasome regulation.

Main Methods:

  • Investigated the effect of DYRK2 on proteasome activity.
  • Analyzed the phosphorylation of the 19S proteasome subunit Rpt3.

Main Results:

  • DYRK2-mediated phosphorylation of Rpt3 was shown to increase proteasome activity.
  • This provides evidence for direct proteasome regulation independent of substrate ubiquitylation.

Conclusions:

  • Direct phosphorylation of proteasome subunits offers a novel regulatory mechanism.
  • DYRK2-mediated Rpt3 phosphorylation is a key factor in controlling proteasome function.

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