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Updated: May 1, 2026

Comparative Strategies for Ubiquitination Detection in Mammalian Cell Lysates Using SMAD2/SMURF2 as a Model
09:00

Comparative Strategies for Ubiquitination Detection in Mammalian Cell Lysates Using SMAD2/SMURF2 as a Model

Published on: April 17, 2026

332

Smurf1-mediated axin ubiquitination requires Smurf1 C2 domain and is cell cycle-dependent

Cong Fei1, Xiaoli He2, Sichun Xie2

  • 1From the State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China cfei@sibcb.ac.cn.

The Journal of Biological Chemistry
|April 5, 2014
PubMed

Insights

The C2 domain of Smad ubiquitination regulatory factor 1 (Smurf1) targets Axin for ubiquitination, crucial for Wnt/β-catenin signaling. This process is cell cycle-regulated and involves non-canonical binding.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Smad ubiquitination regulatory factor 1 (Smurf1) mediates Axin ubiquitination, a key regulator of Wnt/β-catenin signaling.
  • The precise mechanism of Smurf1-Axin interaction and its regulation remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of the Smurf1 C2 domain in Axin ubiquitination and Wnt/β-catenin signaling.
  • To investigate the interaction between Smurf1 and Axin and its regulation by the cell cycle.

Main Methods:

  • Site-directed mutagenesis to assess the function of Smurf1 domains.
  • Immunofluorescence microscopy to analyze protein localization and co-localization.
  • Cell cycle analysis and Wnt signaling assays.

Main Results:

  • The C2 domain of Smurf1 is essential for targeting Axin for ubiquitination.
  • Smurf1 C2 domain-mediated plasma membrane localization is required for Axin ubiquitination.
  • Smurf1 interacts with Axin via its C2 domain in a non-canonical manner, independent of WW-PY interactions.
  • Smurf1-Axin interaction and Axin ubiquitination are reduced in the G2/M phase, enhancing Wnt signaling.

Conclusions:

  • The Smurf1 C2 domain plays a dual role: recruiting Smurf1 to the membrane for Axin interaction and mediating the ubiquitination process.
  • Smurf1-mediated Axin ubiquitination is regulated by the cell cycle, impacting Wnt pathway activity.
Keywords:
Beta-cateninCell CycleProtein-Protein InteractionsUbiquitinationWnt Signaling

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