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Functional domains of axin. Importance of the C terminus as an oligomerization domain

C Sakanaka1, L T Williams

  • 1Cardiovascular Research Institute, University of California, San Francisco, California 94143-0130, USA.

The Journal of Biological Chemistry
|May 13, 1999
PubMed

Insights

Axin inhibits the Wnt pathway by oligomerizing through its C-terminal region. This oligomerization is crucial for Axin

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • The Wnt signaling pathway is crucial for embryonic development and cellular processes.
  • Axin acts as a key negative regulator in the Wnt pathway.
  • Understanding Axin's inhibitory mechanism is vital for therapeutic interventions.

Purpose of the Study:

  • To elucidate the molecular mechanism by which Axin inhibits Wnt signaling.
  • To identify the specific domains of Axin responsible for its inhibitory function.
  • To investigate the role of Axin oligomerization in Wnt pathway regulation.

Main Methods:

  • Generation and characterization of Axin mutants.
  • In vitro binding assays to determine protein-protein interactions.
  • Reporter gene assays to measure Wnt pathway activity.
  • Functional rescue experiments using dimerization domains.

Main Results:

  • Axin binds to glycogen synthase kinase-3beta (GSK-3beta) and beta-catenin.
  • Binding to GSK-3beta and beta-catenin alone is insufficient for inhibition.
  • The C-terminal region of Axin is essential for its inhibitory function and self-binding.
  • Restoration of C-terminal dimerization rescues Axin's inhibitory activity.

Conclusions:

  • Axin's inhibitory function in the Wnt pathway is dependent on its C-terminal region.
  • Oligomerization of Axin via its C terminus is critical for regulating beta-catenin-mediated responses.
  • This study highlights the importance of Axin's structural integrity for Wnt pathway modulation.

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