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Related Experiment Videos

Synaptic scaffolding molecule interacts with axin.

Susumu Hirabayashi1, Wataru Nishimura, Junko Iida

  • 1Department of Medical Biochemistry, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan.

Journal of Neurochemistry
|July 2, 2004
PubMed
Summary

Synaptic scaffolding molecule (S-SCAM) binds to Axin, a novel interaction. This binding inhibits Axin

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Synaptic scaffolding molecule (S-SCAM) is a crucial synaptic protein with PDZ, guanylate kinase, and WW domains.
  • S-SCAM interacts with key synaptic proteins including N-methyl-d-aspartate receptor subunits, neuroligin, and beta-catenin.

Purpose of the Study:

  • To identify novel binding partners of S-SCAM.
  • To elucidate the functional consequences of S-SCAM interactions within the synapse.

Main Methods:

  • Co-immunoprecipitation of S-SCAM and its binding partners from rat brain tissue.
  • Subcellular fractionation to localize proteins within the post-synaptic density.
  • Immunofluorescence microscopy to assess co-localization of S-SCAM and Axin in neurons.
  • In vitro binding assays to map the interaction domains between S-SCAM and Axin.

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Main Results:

  • Axin was identified as a novel binding partner of S-SCAM.
  • Axin was detected in the post-synaptic density fraction and partially co-localized with S-SCAM in neurons.
  • The guanylate kinase domain of S-SCAM directly binds to the GSK3beta-binding region of Axin.
  • S-SCAM forms a complex with beta-catenin and Axin, competing with GSK3beta for Axin binding.
  • S-SCAM inhibits Axin-mediated phosphorylation of beta-catenin by GSK3beta.

Conclusions:

  • Axin is a novel synaptic binding partner of S-SCAM.
  • S-SCAM modulates the Axin/beta-catenin/GSK3beta signaling pathway, suggesting a role in synaptic regulation.