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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Alzheimer's disease (AD) is characterized by amyloid-beta (Aβ) deposition.
  • Beta-secretase 1 (BACE1) cleavage of amyloid precursor protein (APP) is a key step in Aβ generation.
  • APP palmitoylation occurs at Cys186/Cys187 in the E1-ectodomain, with palmitoylated APP (palAPP) showing increased BACE1 preference.

Purpose of the Study:

  • To investigate if APP palmitoylation influences APP dimerization.
  • To determine if APP dimerization leads to elevated BACE1-mediated beta-cleavage.
  • To explore palAPP dimers as potential therapeutic targets.

Main Methods:

  • Investigated APP dimerization using coimmunoprecipitation and FLIM/FRET assays.
  • Assessed the effect of palmitoylating enzymes (DHHC7, DHHC21) and inhibitors on APP dimerization and Aβ release.
  • Conducted in vitro BACE1 activity assays using detergent-resistant membranes (DRMs).

Main Results:

  • Over 90% of palAPP is dimerized, compared to ~20% of total APP.
  • PalAPP dimers form 4.5 times more efficiently and are predominantly cis-oriented.
  • Inhibition of APP palmitoylation reduced APP dimerization; overexpression increased it.
  • Palmitoylation-dependent APP dimerization enhances BACE1-mediated beta-cleavage in DRMs.
  • Generation of sAPPβ-sAPPβ dimers is dependent on APP palmitoylation.

Conclusions:

  • APP palmitoylation promotes its dimerization, which in turn enhances BACE1-mediated beta-cleavage.
  • PalAPP dimers, rather than BACE1 itself, represent a more specific target for inhibiting APP beta-cleavage in Alzheimer's disease.
  • Targeting palAPP dimers may offer a novel therapeutic strategy for reducing Aβ generation.