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Related Experiment Videos

Fe65 interacts with P2X2 subunits at excitatory synapses and modulates receptor function.

Marianela Masin1, Daniel Kerschensteiner, Kerstin Dümke

  • 1Department of Molecular Biology of Neuronal Signals, Max-Planck Institute for Experimental Medicine, Göttingen, Germany.

The Journal of Biological Chemistry
|December 7, 2005
PubMed
Summary

Fe65 protein interacts with neuronal P2X(2) receptors, influencing synaptic transmission. This interaction, occurring in vivo, affects P2X receptor function and ATP signaling.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Ionotropic receptors, including P2X receptors activated by extracellular ATP, are crucial for synaptic transmission.
  • These receptors form macromolecular complexes that regulate their localization and signal transduction.
  • Understanding these interactions is key to deciphering neuronal communication.

Purpose of the Study:

  • To identify proteins interacting with neuronal P2X receptors.
  • To investigate the role of Fe65 in P2X receptor assembly and function.
  • To elucidate the impact of Fe65-P2X receptor interaction on synaptic transmission.

Main Methods:

  • Yeast two-hybrid screening to identify interacting proteins.
  • Glutathione S-transferase pull-down assays to confirm direct interactions.

Related Experiment Videos

  • Postembedding immunogold labeling electron microscopy for subcellular localization.
  • Coimmunoprecipitation from brain extracts to validate in vivo interaction.

    • Main Results:

    • Fe65 and Fe65-like 1 were identified as binding partners for the P2X(2) receptor C-terminal domain.
    • Fe65 directly interacts with P2X(2) but not the P2X(2(b)) splice variant, indicating regulation by alternative splicing.
    • Fe65 colocalizes with P2X(2) subunits at postsynaptic specializations of excitatory synapses in the hippocampus.
    • Coexpression of Fe65 inhibited the activation-dependent changes in ionic selectivity of P2X(2) receptors.

    Conclusions:

    • Fe65 is the first identified protein interacting with neuronal P2X receptors.
    • Alternative splicing of P2X receptors can regulate their assembly into macromolecular complexes.
    • Fe65 plays a role in regulating P2X receptor function and ATP-mediated synaptic transmission.