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Single-molecule methods for measuring ubiquitination and protein stability.

Jason Hon1, Ying Lu1

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Methods in Enzymology
|March 27, 2019
PubMed
Summary

The ubiquitin-proteasome system (UPS) regulates protein stability for cell functions. This study uses single-molecule imaging to analyze the anaphase-promoting complex/cyclosome (APC/C) and 26S proteasome in ubiquitination and degradation.

Keywords:
26S proteasomeAnaphase-promoting complex/cyclosomeSingle-molecule fluorescenceUbiquitin

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Molecular Mechanisms

Background:

  • The ubiquitin-proteasome system (UPS) is crucial for cellular homeostasis, controlling the stability of approximately one-third of human proteins.
  • Key UPS components include ubiquitin ligases like the anaphase-promoting complex/cyclosome (APC/C) and the 26S proteasome, which mediate targeted protein degradation.
  • Protein degradation rates are influenced by ubiquitin chain topology, and ligase/proteasome selectivity involves complex kinetic mechanisms.

Purpose of the Study:

  • To investigate the kinetic mechanisms underlying substrate selectivity in ubiquitination and protein degradation.
  • To apply single-molecule techniques for detailed analysis of APC/C and 26S proteasome function.
  • To visualize and quantify in vitro ubiquitination and degradation reactions catalyzed by these key UPS components.

Main Methods:

  • Utilized fluorescence-based single-molecule imaging techniques.
  • Studied in vitro ubiquitination reactions catalyzed by the anaphase-promoting complex/cyclosome (APC/C).
  • Analyzed ubiquitin-dependent degradation reactions mediated by the 26S proteasome.

Main Results:

  • Demonstrated the capability of single-molecule imaging to distinguish differential substrate affinities.
  • Provided insights into reaction intermediates in complex ubiquitination and degradation mixtures.
  • Characterized the kinetic mechanisms governing APC/C and 26S proteasome substrate selectivity.

Conclusions:

  • Single-molecule imaging is a powerful tool for dissecting complex enzymatic mechanisms in the UPS.
  • The study elucidates the highly regulated kinetic control of protein ubiquitination and degradation.
  • Findings contribute to understanding how the UPS maintains cellular state and homeostasis through precise protein turnover.