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The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
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Updated: Oct 7, 2025

In Vitro Analysis of E3 Ubiquitin Ligase Function
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E3 ubiquitin ligases: styles, structures and functions.

Quan Yang1, Jinyao Zhao1, Dan Chen2

  • 1Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, 116044, China.

Molecular Biomedicine
|January 10, 2022
PubMed
Summary
This summary is machine-generated.

E3 ubiquitin ligases are key enzymes in cellular processes and cancer development. Understanding their roles can lead to new cancer therapies and prognostic markers.

Keywords:
26S proteasome degradationCancer progressionE3 ligasesPROTACsTherapeuticsUbiquitination

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • E3 ubiquitin ligases are crucial enzymes in the ubiquitination cascade, alongside E1 and E2 enzymes.
  • They catalyze ubiquitination, attaching ubiquitin to target substrates at lysine residues, a process vital for eukaryotic life.
  • Ubiquitination is implicated in numerous biological activities, including cellular stress responses relevant to cancer.

Purpose of the Study:

  • To explore the classification of E3 ubiquitin ligases.
  • To elucidate the significant roles of E3 ligases in cancer progression.
  • To discuss the therapeutic potential of targeting E3 ligases in cancer treatment.

Main Methods:

  • Literature review and synthesis of existing research on E3 ubiquitin ligases.
  • Analysis of the involvement of E3 ligases in various biological processes.
  • Examination of the connection between E3 ligases and cancer development and therapy.

Main Results:

  • E3 ubiquitin ligases are diverse enzymes essential for protein regulation.
  • These ligases play multifaceted roles in promoting or inhibiting cancer progression.
  • Dysregulation of E3 ligase activity is frequently observed in various cancers.

Conclusions:

  • E3 ubiquitin ligases are critical regulators of cellular functions and are implicated in tumorigenesis.
  • Targeting E3 ligases presents a promising strategy for novel cancer therapeutics.
  • Further research into E3 ligase mechanisms can yield new prognostic biomarkers and anticancer approaches.