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Updated: Aug 7, 2026

Detection of Protein Ubiquitination
09:00

Detection of Protein Ubiquitination

Published on: August 19, 2009

Neddylation pathway promotes the ubiquitinated degradation of FBXO21 in lung cancer cells

Ying Zhang1, Meng Li1, Tiangeng Dong2

  • 1Cancer Institute, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.

Carcinogenesis
|August 5, 2026
PubMed

Insights

Neddylation-ROC1 E3 ligase targets FBXO21 for degradation, impacting cancer pathways. This regulation stabilizes p53, increasing p21 transcription and revealing a novel cancer mechanism.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Research

Background:

  • SCF (Skp1-Cullin1-Fbox protein) E3 ligases are crucial in protein degradation for physiological and pathological processes.
  • F-box proteins dictate substrate specificity and stability within SCF complexes.
  • Regulatory mechanisms governing FBXO21 degradation in human cancers are not well understood.

Purpose of the Study:

  • To elucidate the regulatory mechanisms controlling FBXO21 protein levels in human cancers.
  • To investigate the role of Neddylation-ROC1 E3 ligase in FBXO21 degradation.
  • To determine the downstream effects of FBXO21 regulation on the p53-p21 signaling pathway.

Main Methods:

  • Investigated the interaction between Neddylation-ROC1 E3 ligase and FBXO21.
  • Assessed the ubiquitination and degradation of FBXO21 mediated by Neddylation-ROC1.
  • Analyzed the impact of FBXO21 depletion on p53 protein stability and p21 transcriptional levels.

Main Results:

  • Neddylation-ROC1 E3 ligase was identified as a regulator of FBXO21 protein levels.
  • Mechanistic studies confirmed that Neddylation-ROC1 targets FBXO21 for ubiquitination and subsequent degradation.
  • FBXO21 depletion led to increased p53 protein stability by inhibiting its degradation, consequently upregulating p21 transcription.

Conclusions:

  • A novel mechanism of FBXO21 regulation via Neddylation modification has been uncovered.
  • FBXO21 plays a significant role in modulating the p53-p21 signaling pathway.
  • These findings provide new insights into the molecular mechanisms underlying human cancers.
Keywords:
FBXO21lung cancerneddylation

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