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Related Experiment Videos

Stress-activated kinases regulate protein stability

S Y Fuchs1, V A Fried, Z Ronai

  • 1The Ruttenberg Cancer Center, Mount Sinai Medical School, New York, New York 10029, USA.

Oncogene
|October 21, 1998
PubMed
Summary
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Signal transduction pathways are regulated by protein degradation. This review highlights how protein phosphorylation and dephosphorylation control protein ubiquitination, impacting cellular responses to stress and damage.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The ubiquitin-proteasome pathway (UPP) is crucial for regulated protein degradation.
  • Understanding the precise mechanisms that target proteins for ubiquitination is a key question in signal transduction.
  • Proteasome inhibitors have revealed the UPP's role in regulating signal transduction proteins.

Purpose of the Study:

  • To explore the relationship between phosphorylation/dephosphorylation cascades and protein ubiquitination.
  • To elucidate how these post-translational modifications regulate protein targeting for degradation.
  • To provide insights into global regulatory control pathways.

Main Methods:

  • Review of existing literature on signal transduction, phosphorylation, and ubiquitination.

Related Experiment Videos

  • Analysis of case studies involving key signaling proteins and pathways.
  • Integration of data to propose a model for regulatory control.

    • Main Results:

    • Phosphorylation/dephosphorylation directly influences the ubiquitination of regulatory proteins.
    • Altered interactions between targeting systems and substrates due to phosphorylation are demonstrated.
    • Examples include p53, c-jun, ATF-2, IkappaB-NFkappaB, and JAK-STAT pathways.

    Conclusions:

    • The interplay between phosphorylation and ubiquitination networks offers a comprehensive view of cellular regulation.
    • This integration provides a powerful mechanism for controlling cellular responses.
    • Understanding these networks is vital for deciphering complex biological processes.