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The COP9 signalosome.

Ning Wei1, Xing Wang Deng

  • 1Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8104, USA. ning.wei@yale.edu

Annual Review of Cell and Developmental Biology
|October 23, 2003
PubMed
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The COP9 signalosome (CSN) regulates protein degradation. This complex has metalloprotease and kinase activities, impacting diverse cellular processes and development.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The COP9 signalosome (CSN) is an evolutionarily conserved protein complex.
  • CSN shares homology with the 26S proteasome lid and regulates photomorphogenesis in plants.
  • CSN participates in various cellular and developmental processes across eukaryotes.

Purpose of the Study:

  • To elucidate the enzymatic activities and regulatory roles of the COP9 signalosome.
  • To understand CSN's involvement in protein degradation pathways.

Main Methods:

  • Biochemical assays to characterize metalloprotease and kinase activities.
  • Studies on CSN's interaction with SCF ubiquitin E3 ligase.
  • Investigation of CSN's role in de-neddylation and de-ubiquitination.

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Main Results:

  • CSN possesses metalloprotease activity, primarily via the CSN5/Jab1 subunit, mediating de-neddylation of cullins.
  • CSN is associated with de-ubiquitination and protein kinase activities.
  • CSN regulates key signaling proteins through phosphorylation.

Conclusions:

  • CSN's diverse enzymatic activities are crucial for its multifaceted roles in cellular regulation.
  • CSN controls protein degradation via the ubiquitin-proteasome system, impacting development.
  • CSN is a central regulator of signaling pathways essential for eukaryotic life.