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PSD-95 binding dynamically regulates NLGN1 trafficking and function.

Jaehoon Jeong1, Saurabh Pandey1, Yan Li1

  • 1National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892.

Proceedings of the National Academy of Sciences of the United States of America
|May 30, 2019
PubMed
Summary
This summary is machine-generated.

Neurexin and Neuroligin 1 (NLGN1) interactions are crucial for synapse function. This study reveals how PKA phosphorylation of NLGN1 regulates its binding to PSD-95, impacting synaptic expression and function.

Keywords:
NLGN1PKAPSD-95phosphorylation

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Synaptic plasticity and function rely on scaffolding proteins like PSD-95.
  • Neuroligin 1 (NLGN1) is a postsynaptic adhesion molecule essential for synapse assembly and function.
  • The interaction between NLGN1 and PSD-95 is critical but not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanism regulating the interaction between NLGN1 and PSD-95.
  • To determine the role of NLGN1 phosphorylation in this interaction and its functional consequences.
  • To elucidate the impact of disrupted NLGN1-PSD-95 binding on synaptic NLGN1 expression and function.

Main Methods:

  • Primary neuronal cultures were used to study protein interactions and localization.
  • Site-directed mutagenesis was employed to create phosphomimetic NLGN1 mutations.
  • Immunocytochemistry and biochemical assays were performed to assess protein expression and binding.

Main Results:

  • Disruption of the NLGN1-PSD-95 interaction led to decreased surface expression of NLGN1.
  • Protein Kinase A (PKA) phosphorylates NLGN1 at serine 839 (S839), modulating PSD-95 binding.
  • A phosphomimetic mutation at S839 significantly impaired NLGN1 binding to PSD-95.
  • Reduced NLGN1-PSD-95 binding diminished synaptic NLGN1 levels and NLGN1-mediated synaptic enhancement.

Conclusions:

  • NLGN1 binding to PSD-95 is regulated by PKA-mediated phosphorylation at S839.
  • This phosphorylation-dependent interaction is crucial for maintaining synaptic NLGN1 expression and function.
  • The findings provide a molecular mechanism for regulating excitatory synapse development and plasticity.