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O-GlcNAc regulates NEDD4-1 stability via caspase-mediated pathway

Kuan Jiang1, Bingyang Bai1, Yajie Ta1

  • 1State Key Laboratory of Medicinal Chemical Biology and College of Pharmacy, Collaborative Innovation Center for Biotherapy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, 300071, China.

Biochemical and Biophysical Research Communications
|February 16, 2016
PubMed

Insights

O-linked N-acetylglucosamine (O-GlcNAc) modification negatively regulates NEDD4-1 protein levels. This study reveals O-GlcNAcylation impacts E3 ubiquitin ligase stability, influencing cellular processes.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • O-GlcNAc modification regulates crucial cellular processes like transcription and protein degradation.
  • A dynamic interplay exists between O-GlcNAcylation and ubiquitination in cellular regulation.
  • NEDD4-1 is a vital E3 ubiquitin ligase involved in protein degradation pathways.

Purpose of the Study:

  • To investigate the regulatory relationship between O-GlcNAcylation and the E3 ubiquitin ligase NEDD4-1.
  • To elucidate the mechanism by which O-GlcNAc modification affects NEDD4-1 stability.

Main Methods:

  • Stimulation with PUGNAc or glucosamine to increase O-GlcNAc levels.
  • Manipulation of O-GlcNAc transferase (OGT) via knockdown, overexpression, and mutation.
  • Treatment with a caspase inhibitor to assess the role of caspases in NEDD4-1 degradation.

Main Results:

  • Increased O-GlcNAc levels, induced by PUGNAc or glucosamine, led to decreased NEDD4-1 protein levels.
  • OGT manipulation confirmed that cellular O-GlcNAc negatively regulates NEDD4-1 stability.
  • Caspase inhibition significantly blocked NEDD4-1 degradation induced by PUGNAc or glucosamine.

Conclusions:

  • O-GlcNAcylation negatively regulates the stability of the E3 ubiquitin ligase NEDD4-1.
  • This regulation occurs indirectly and involves caspase-dependent degradation pathways.
  • The findings reveal a novel mechanism linking O-GlcNAc modification to the control of E3 ligase activity and protein homeostasis.
Keywords:
CaspaseNEDD4-1O-GlcNAcylationOGT

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