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Detection of Protein Ubiquitination
09:00

Detection of Protein Ubiquitination

Published on: August 19, 2009

Nedd4-1 binds and ubiquitylates activated FGFR1 to control its endocytosis and function

Avinash Persaud1, Philipp Alberts, Madeline Hayes

  • 1Programs in Cell Biology and Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada.

The EMBO Journal
|July 19, 2011
PubMed

Insights

Human Nedd4-1 E3 ubiquitin ligase controls Fibroblast Growth Factor Receptor 1 (FGFR1) endocytosis and signaling. This regulation is crucial for neuronal differentiation and embryonic development.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Fibroblast Growth Factor Receptor 1 (FGFR1) is vital for cell growth and differentiation.
  • Dysregulated FGFR1 signaling contributes to developmental abnormalities.

Purpose of the Study:

  • To investigate the role of human Nedd4 (Nedd4-1) E3 ubiquitin ligase in regulating FGFR1.
  • To elucidate the mechanism by which Nedd4-1 controls FGFR1 endocytosis and signaling.

Main Methods:

  • Biochemical assays to study Nedd4-1 and FGFR1 interaction and ubiquitylation.
  • Genetic manipulation (mutagenesis, knockdown) in cell lines and zebrafish embryos.
  • Analysis of receptor phosphorylation and downstream signaling pathways.

Main Results:

  • Nedd4-1 directly binds and ubiquitylates activated FGFR1 via its WW3 domain and a novel non-PY motif.
  • Deletion of the Nedd4-1 recognition motif on FGFR1 impairs receptor ubiquitylation and endocytosis.
  • Nedd4-1 knockdown or FGFR1 mutant expression leads to sustained FGFR1 signaling and promotes neuronal differentiation.

Conclusions:

  • Nedd4-1 acts as a key regulator of FGFR1 endocytosis and signaling.
  • This regulation is essential for proper neuronal differentiation and embryonic head development.
  • Nedd4-1-mediated control of FGFR1 is critical for developmental processes.

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