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Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates
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DEPTOR ubiquitination and destruction by SCF(β-TrCP)

Zhiwei Wang1, Jiateng Zhong, Daming Gao

  • 1Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.

American Journal of Physiology. Endocrinology and Metabolism
|March 29, 2012
PubMed

Insights

Beta-Transducin repeats-containing protein (β-TrCP) targets DEPTOR for destruction, regulating cell growth and autophagy. This SCF(β-TrCP) ligase complex controls DEPTOR stability, impacting human diseases like cancer.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Beta-Transducin repeats-containing protein (β-TrCP) is a key component of the SCF E3 ubiquitin ligase complex.
  • SCF(β-TrCP) targets phosphorylated proteins for proteasomal degradation, influencing various cellular processes and diseases.

Purpose of the Study:

  • To review the role of β-TrCP in regulating cell growth and autophagy.
  • To highlight DEPTOR as a novel substrate of SCF(β-TrCP).
  • To discuss the phosphorylation-dependent mechanism controlling DEPTOR stability.

Main Methods:

  • Literature review of recent findings on SCF(β-TrCP) and DEPTOR.
  • Analysis of the ubiquitination and degradation pathways involving β-TrCP.
  • Discussion of the functional consequences of DEPTOR regulation.

Main Results:

  • SCF(β-TrCP) ubiquitinates and degrades DEPTOR in a phosphorylation-dependent manner.
  • Regulation of DEPTOR stability by SCF(β-TrCP) impacts cell growth and autophagy.
  • DEPTOR is identified as a novel downstream substrate influencing these processes.

Conclusions:

  • β-TrCP plays a critical role in controlling cell growth and autophagy through DEPTOR degradation.
  • Understanding the SCF(β-TrCP)-DEPTOR axis offers insights into tumorigenesis and other diseases.
  • This regulatory mechanism highlights the importance of protein stability in cellular homeostasis.

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