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NOS1AP associates with Scribble and regulates dendritic spine development.

Lindsay Richier1, Kelly Williton, Leanne Clattenburg

  • 1Departments of Pharmacology, Surgery, and Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia B3H 1X5, Canada.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 2, 2010
PubMed
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The tumor suppressor Scribble protein interacts with NOS1AP, a key synaptic protein. This interaction, involving specific protein domains, helps regulate neuronal structure and function, highlighting a novel role for Scribble in synapse development.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synaptic function relies on precise protein localization.
  • Cellular polarity proteins are increasingly recognized for their roles in synapses.

Purpose of the Study:

  • To identify novel protein complexes involved in synaptic function using polarity proteins.
  • To investigate the role of the tumor suppressor Scribble and NOS1AP in the mammalian synapse.

Main Methods:

  • Proteomic screening of known polarity proteins.
  • Co-immunoprecipitation to identify protein associations.
  • Analysis of protein domain interactions.
  • Overexpression studies in neurons to assess effects on dendritic protrusions and Rac activity.

Main Results:

  • Scribble directly associates with NOS1AP (also known as CAPON) at both presynaptic and postsynaptic sites.
  • This interaction is mediated by the PTB domain of NOS1AP and the PDZ domain of Scribble.
  • Scribble links NOS1AP to the beta-Pix/Git1/PAK complex.
  • NOS1AP overexpression increases dendritic protrusions, dependent on its PTB domain, and influences Rac activity.

Conclusions:

  • NOS1AP plays a significant role in the mammalian synapse.
  • The Scribble-NOS1AP interaction is a novel mechanism influencing synaptic structure and potentially function.
  • Polarity proteins like Scribble are integral to synaptic organization and development.