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The deubiquitinase BAP1 stabilizes Spindlin-4 (SPIN4) by removing ubiquitin tags, maintaining protein homeostasis. Loss of BAP1 reduces SPIN4 levels, impacting epigenetic regulation and disease.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Ubiquitin Biology

Background:

  • Protein homeostasis is regulated by E3 ubiquitin ligases and deubiquitinases (DUBs).
  • Spindlin-4 (SPIN4), a histone H3K4me3 reader, was previously identified as a degradation substrate of DCAF16.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling SPIN4 stability.
  • To identify the deubiquitinase responsible for SPIN4 homeostasis.

Main Methods:

  • E3 ligase-focused CRISPR-Cas9 knockout screen.
  • Deubiquitinase-focused CRISPR-Cas9 knockout screen.
  • Biochemical analyses, proteomics, and interactome studies.

Main Results:

  • Confirmed SPIN4 as a degradation substrate of DCAF16.
  • Identified BAP1 as a deubiquitinase that interacts with and stabilizes SPIN4.
  • Demonstrated that BAP1 deubiquitination activity is essential for maintaining SPIN4 levels.

Conclusions:

  • BAP1 plays a critical role in maintaining SPIN4 homeostasis through deubiquitination.
  • This regulatory axis highlights a dynamic balance controlling SPIN4 stability.
  • Findings have implications for understanding epigenetic regulation and disease processes.