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In Vitro Analysis of E3 Ubiquitin Ligase Function
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In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

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Regulation of Krüppel-like factor 8 by the NEDD4 E3 ubiquitin ligase

Aiqin Sun1,2, Jie Hao1, Lin Yu1

  • 1Burnett School of Biomedical Sciences University of Central Florida College of Medicine Orlando, FL 32827, USA.

American Journal of Translational Research
|April 12, 2019
PubMed

Insights

Neural precursor cell expressed, developmentally down-regulated 4 (NEDD4) is identified as the E3 ubiquitin ligase for Krüppel-like factor 8 (KLF8). This interaction, dependent on ERK phosphorylation, enhances KLF8 stability and transcriptional activity, offering cancer treatment insights.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Oncology

Background:

  • Krüppel-like factor 8 (KLF8) is implicated in various diseases, particularly cancer.
  • KLF8 is known to be regulated by ubiquitylation, a crucial post-translational modification.
  • The specific molecular mechanisms governing KLF8 ubiquitylation remained largely unelucidated.

Purpose of the Study:

  • To identify the E3 ubiquitin ligase responsible for KLF8 ubiquitylation.
  • To elucidate the regulatory mechanism of KLF8 stability and transcriptional activity.
  • To explore the therapeutic potential of targeting the KLF8-NEDD4 axis in cancer.

Main Methods:

  • Co-immunoprecipitation and ubiquitylation assays to confirm KLF8-NEDD4 interaction.
  • Site-directed mutagenesis and MEK inhibition to investigate phosphorylation-dependent ubiquitylation.
  • Cycloheximide chase analysis, reporter assays, and fluorescent staining to assess KLF8 stability and localization.

Main Results:

  • Neural precursor cell expressed, developmentally down-regulated 4 (NEDD4) was identified as the E3 ubiquitin ligase for KLF8.
  • KLF8 ubiquitylation by NEDD4 is dependent on ERK-mediated phosphorylation at serine 48.
  • NEDD4 promotes KLF8 nuclear stability and enhances its transcriptional activity.

Conclusions:

  • NEDD4 is a novel E3 ubiquitin ligase for KLF8, regulating its stability and function.
  • The KLF8-NEDD4 axis represents a potential therapeutic target for cancers overexpressing both proteins.
  • This study provides critical insights into the post-translational regulation of KLF8 in cancer.
Keywords:
KLF8NEDD4interactionubiquitylation

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