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Structural basis for a reciprocal regulation between SCF and CSN.

Radoslav I Enchev1, Daniel C Scott, Paula C A da Fonseca

  • 1ETH-Zurich, Institute of Biochemistry, Department of Biology, Zurich, Switzerland.

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The Cop9 signalosome (CSN) binds Skp1-Cul1-Fbox (SCF) ligases, blocking their activity until a substrate triggers release. This mechanism controls substrate ubiquitination and degradation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • Skp1-Cul1-Fbox (SCF) E3 ligases are crucial for protein degradation.
  • The Cop9 signalosome (CSN) regulates SCF ligase activity through deneddylation.
  • CSN also promotes SCF substrate turnover via unknown mechanisms.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which CSN regulates SCF ligase activity.
  • To determine the structural basis for CSN-mediated inhibition of SCF ligases.
  • To understand how CSN integrates SCF assembly state with neddylation and ubiquitination.

Main Methods:

  • Biochemical analyses of CSN-SCF interactions.
  • Electron microscopy to determine molecular models of CSN-SCF complexes.
  • In vitro assays to assess E2 enzyme and substrate binding, and ubiquitination.

Main Results:

  • CSN directly binds and occludes functional sites of SCF ligases (SCF(Skp2/Cks1) and SCF(Fbw7)).
  • CSN binding inhibits SCF ligase activity by preventing E2 enzyme and substrate interactions, independent of deneddylation.
  • CSN binding also prevents cullin neddylation, which is only permitted upon substrate-induced CSN dissociation.

Conclusions:

  • CSN acts as a direct inhibitor of SCF ligase catalytic activity.
  • A substrate-induced release mechanism couples SCF assembly, neddylation, and ubiquitination.
  • This regulatory mechanism ensures that SCF ligases are activated only in the presence of their substrates, promoting targeted protein degradation.