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Specificity of the anaphase-promoting complex: a single-molecule study.

Ying Lu1, Weiping Wang1, Marc W Kirschner2

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The anaphase-promoting complex (APC) uses a feedback loop to achieve specific ubiquitylation, even with short recognition sequences. This process enhances substrate binding, ensuring accurate cell-cycle timing.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Biological specificity often relies on short recognition sequences.
  • The anaphase-promoting complex (APC) mediates ubiquitylation crucial for cell-cycle timing using short, redundant motifs.

Purpose of the Study:

  • To investigate the origin of specificity in APC-mediated ubiquitylation reactions.
  • To understand how transient ubiquitylation reactions achieve high substrate specificity.

Main Methods:

  • Design and implementation of single-molecule fluorescence assays.
  • Observation of transient ubiquitylation events mediated by the APC.

Main Results:

  • APC-mediated ubiquitylation initiates with a highly processive reaction.
  • Subsequent reactions occur at a slower rate after multiple substrate encounters.
  • Initial ubiquitylation significantly enhances substrate binding affinity by increasing on-rate and decreasing off-rate.

Conclusions:

  • A positive feedback cycle involving enhanced substrate binding drives specificity.
  • This mechanism allows for precise targeting of substrates with short recognition motifs in complex cellular environments.
  • Understanding this process is key to deciphering cell-cycle regulation and other biological pathways dependent on ubiquitylation.