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Ubiquitination status does not affect Vps34 degradation.

Jing Tang1, Fei Sun2, Xiao-Juan Deng1

  • 1Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing 400016, China.

Genes & Diseases
|September 5, 2020
PubMed
Summary
This summary is machine-generated.

Vacuolar protein-sorting 34 (Vps34) ubiquitination does not control its degradation, even in Alzheimer

Keywords:
AD, Alzheimer's diseaseAPP, β-amyloid precursor proteinAPP/PS1, expressing Swedish APP and Presenilin1 delta exon 9 mutationsAlzheimer's diseaseDegradationKs, lysine residuesPI3K, class III phosphatidylinositol 3-kinaseUB, ubiquitinationUPSUPS, ubiquitin proteasome systemUbiquitinationVPS34Vps34, vacuolar protein-sorting 34WT, wild-type

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Neuroscience

Background:

  • Vacuolar protein-sorting 34 (Vps34) is crucial for autophagy and endosomal trafficking.
  • Protein ubiquitination and degradation are closely linked cellular processes.
  • The role of Vps34 ubiquitination in its own degradation remains unclear.

Purpose of the Study:

  • To investigate the relationship between Vps34 ubiquitination and its protein levels.
  • To determine if Vps34 ubiquitination influences its degradation pathways.

Main Methods:

  • Transfection of cells with ubiquitin constructs lacking specific lysine residues.
  • Pharmacological manipulation of E2/E3 ligase activity.
  • In vivo studies using APP/PS1 mice, an Alzheimer's disease model.
  • Treatment with proteasomal (MG132) and lysosomal (chloroquine) inhibitors.

Main Results:

  • Vps34 ubiquitination occurred independently of lysine residues in ubiquitin.
  • Vps34 protein levels were not significantly altered by ubiquitin mutations or overexpression.
  • Vps34 levels were modulated by E2/E3 activity but not significantly affected by ubiquitin overexpression.
  • In Alzheimer's disease models, reduced Vps34 ubiquitination did not alter Vps34 protein levels.
  • Proteasomal and lysosomal inhibitors increased Vps34 protein levels, indicating degradation via these pathways.

Conclusions:

  • Vps34 ubiquitination is not a primary regulator of its protein degradation.
  • Vps34 undergoes proteasomal and lysosomal degradation independently of its ubiquitination status.
  • This finding contrasts with the typical role of ubiquitination in protein turnover.