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Visualization of specific γ-secretase complexes using bimolecular fluorescence complementation.

Xavier Meckler1, Frédéric Checler1

  • 1Université de Nice Sophia-Antipolis, Institut de Pharmacologie Moléculaire et Cellulaire, Equipe labellisée Fondation pour la Recherche Médicale et Laboratoire d'Excellence Distalz, Sophia-Antipolis, Valbonne, France.

Journal of Alzheimer'S Disease : JAD
|January 14, 2014
PubMed
Summary

Researchers developed new tools to visualize gamma-secretase complexes, revealing distinct trafficking patterns based on APH-1 variants. This helps understand how complex composition influences substrate processing and cellular localization.

Keywords:
APH-1PEN-2fluorescence microscopynicastrinpresenilintransmembrane protein transportγ-secretase

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Area of Science:

  • Cellular Biology
  • Molecular Neuroscience

Background:

  • Gamma-secretase is a crucial enzyme complex involved in intramembrane proteolysis of substrates like amyloid-β protein precursor (AβPP).
  • The gamma-secretase complex comprises four core components: presenilin 1/2, APH-1, PEN-2, and Nicastrin.
  • Different APH-1 variants exist, potentially leading to distinct gamma-secretase complexes with unique functions and cellular destinations.

Purpose of the Study:

  • To investigate whether the molecular composition of gamma-secretase complexes influences their subcellular trafficking and targeting.
  • To develop novel tools for visualizing the distribution of distinct gamma-secretase complexes within cells.
  • To determine if specific APH-1 variants lead to differential localization of gamma-secretase.

Main Methods:

  • Generation of bigenic expression vectors for co-expressing untagged Nicastrin or Presenilin 1 with PEN-2 or different APH-1 variants (aL, aS, b).
  • Utilized complementary fragments of the fluorescent protein Venus for bimolecular fluorescence complementation (BiFC) assays.
  • Visualized functional gamma-secretase complex formation and localization in COS-7 cells using BiFC.

Main Results:

  • Functional gamma-secretase complexes were successfully formed and visualized using BiFC.
  • BiFC signals were detected at the plasma membrane, endosomes/lysosomes, and endoplasmic reticulum (ER) for most APH-1 variants.
  • APH-1b-containing gamma-secretase complexes showed predominantly ER localization, suggesting retention or retrieval.

Conclusions:

  • The study presents novel BiFC-based tools for studying gamma-secretase complex trafficking.
  • Different APH-1 variants contribute to distinct subcellular localization patterns of gamma-secretase complexes.
  • These findings provide insights into how gamma-secretase composition may dictate substrate specificity through compartmentalization.