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Study of Protein-protein Interactions in Autophagy Research
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HUNK Phosphorylates Rubicon to Support Autophagy.

Joelle N Zambrano1, Scott T Eblen1, Melissa Abt2

  • 1Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston, SC 29425, USA.

International Journal of Molecular Sciences
|November 23, 2019
PubMed
Summary

Hormonally Upregulated Neu-associated Kinase (HUNK) phosphorylates Rubicon, a protein that suppresses autophagy. This phosphorylation event inhibits Rubicon, thereby promoting cellular recycling through autophagy.

Keywords:
HUNKRubiconautophagykinasephosphorylation

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy is a crucial cellular recycling process for maintaining homeostasis.
  • Rubicon, a Beclin-1 associated protein, inhibits autophagy by impairing Vps34 activity.
  • The regulatory mechanisms of Rubicon function remain largely uncharacterized.

Purpose of the Study:

  • To investigate the interaction between Hormonally Upregulated Neu-associated Kinase (HUNK) and Rubicon.
  • To determine if HUNK phosphorylates Rubicon and how this affects Rubicon's function in autophagy regulation.

Main Methods:

  • Co-immunoprecipitation assays to assess HUNK-Rubicon binding.
  • Kinase assays to confirm Rubicon phosphorylation by HUNK.
  • Immunofluorescence and immunoblotting of LC3B to monitor autophagy levels.

Main Results:

  • Rubicon is identified as a novel substrate of HUNK.
  • Phosphorylation of Rubicon by HUNK inhibits its autophagy-suppressive activity.
  • HUNK-mediated phosphorylation of Rubicon promotes autophagy.

Conclusions:

  • HUNK directly phosphorylates Rubicon, acting as a key regulator of its function.
  • This novel regulatory mechanism reveals a pathway to promote autophagy by inhibiting Rubicon.
  • Understanding HUNK-Rubicon interaction offers new insights into autophagy control.