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Related Experiment Videos

FE65 interaction with the ApoE receptor ApoEr2.

Hyang-Sook Hoe1, Laura Ann Magill, Suzanne Guenette

  • 1Department of Neuroscience, Georgetown University Medical Center, Washington, D. C. 20057-1464, USA.

The Journal of Biological Chemistry
|April 28, 2006
PubMed
Summary

The adaptor protein FE65 links beta-amyloid precursor protein (APP) and apoE receptor (ApoEr2), influencing their processing and reducing amyloid-beta (Abeta) production. This suggests FE65

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • The adaptor protein FE65 interacts with APP, affecting APP processing and Abeta production.
  • Previous data suggest extracellular and intracellular interactions between APP and the apoE receptor ApoEr2.

Purpose of the Study:

  • To investigate the role of FE65 as an intracellular linker between ApoEr2 and APP.
  • To determine how FE65 influences the processing and surface expression of APP and ApoEr2.

Main Methods:

  • Co-immunoprecipitation experiments in COS7 cells to demonstrate protein interactions.
  • Surface protein biotinylation and live cell surface staining to assess surface protein expression.
  • Analysis of secreted proteins and protein fragments to evaluate processing pathways.

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Main Results:

  • FE65 interacts with ApoEr2 via its N-terminal PTB domain.
  • Full-length FE65 enhances the co-immunoprecipitation of ApoEr2 and APP.
  • FE65 increases the surface expression of ApoEr2.
  • Constructs with both PTB domains of FE65 increase secreted APP, secreted ApoEr2, and their C-terminal fragments.
  • Full-length FE65 significantly reduces Abeta production more than individual FE65 domains.

Conclusions:

  • FE65 acts as an intracellular bridge between APP and ApoEr2.
  • FE65, particularly full-length, modulates APP and ApoEr2 processing and Abeta production.
  • The dual PTB domains of FE65 are crucial for its effects on protein processing.