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Activity-dependent changes in synaptic protein complex composition are consistent in different detergents despite

Jonathan D Lautz1, Edward P Gniffke1, Emily A Brown1,2

  • 1Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA, USA.

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Detergents impact synaptic protein solubility, affecting interaction detection. However, activity-dependent changes in protein complexes are consistent across detergent types, aiding learning and memory research.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Post-synaptic density (PSD) protein complexes are crucial for learning and memory.
  • Studying these dynamic interactions is challenging due to detergent interference during isolation.
  • Previous research acknowledges detergent variability but lacks rigorous examination of their impact on synaptic protein complexes.

Purpose of the Study:

  • To investigate the effect of commonly used detergents on activity-dependent protein interactions within synaptic complexes.
  • To determine how different detergents influence the detection and abundance of specific synaptic protein interactions.

Main Methods:

  • Characterization of activity-dependent protein interactions using three common detergents: Deoxycholate (DOC), NP-40, and Triton.
  • Utilizing size exclusion chromatography to analyze protein complexes in high molecular weight fractions.
  • Assessing protein abundance and interaction detection across different detergent conditions.

Main Results:

  • SynGAP interactions were more abundant in Deoxycholate (DOC), while Shank-, Homer-, and mGluR5-containing interactions were more prevalent in NP-40 or Triton.
  • All interactions were preferentially detected in high molecular weight complexes.
  • Detergents influenced baseline protein solubility but did not alter the fundamental nature of activity-dependent changes in protein complexes.

Conclusions:

  • Detergents differentially affect the solubility of individual synaptic proteins.
  • While detection feasibility varies with detergent, activity-dependent protein interaction changes are consistent across detergent types.
  • These findings clarify detergent effects, enabling more reliable studies of synaptic plasticity and molecular mechanisms of learning and memory.