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Updated: Jun 23, 2025

In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity

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Targeting of SUMOylation leads to cBAF complex stabilization and disruption of the SS18::SSX transcriptome in

Konstantinos V Floros1,2, Carter K Fairchild1,3, Jinxiu Li4

  • 1VCU Philips Institute, Virginia Commonwealth University School of Dentistry and Massey Comprehensive Cancer Center, Richmond VA, 23298 USA.

Research Square
|June 17, 2024
PubMed

Insights

Synovial sarcoma is driven by SS18::SSX, which disrupts chromatin remodeling. Targeting the SUMOylation pathway with TAK-981 restores normal complexes, inhibits tumor growth, and enhances chemotherapy efficacy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Chromatin Biology

Background:

  • Synovial sarcoma (SS) is driven by the SS18::SSX fusion oncoprotein.
  • SS18::SSX disrupts ATP-dependent chromatin remodeling BAF (SWI/SNF) complexes, promoting tumorigenesis.

Purpose of the Study:

  • To investigate the therapeutic potential of targeting the SUMOylation pathway in SS.
  • To elucidate the mechanism of action of the SAE1/2 inhibitor TAK-981 in SS.

Main Methods:

  • Utilized small molecule inhibitor TAK-981 targeting SAE1/2 SUMOylation.
  • Analyzed chromatin remodeling complex composition and transcriptional changes.
  • Assessed tumor inhibition and synergistic effects with chemotherapy in SS models.

Main Results:

  • SS is sensitive to TAK-981, which de-SUMOylates SMARCE1, restoring canonical BAF (cBAF) complexes.
  • TAK-981 shifts transcription away from the SS18::SSX-ncBAF program, inducing DNA damage and cell death.
  • TAK-981 demonstrated tumor inhibition in human and mouse SS models and synergized with chemotherapy for tumor regression.

Conclusions:

  • Targeting the SUMOylation pathway represents a therapeutic vulnerability in SS.
  • TAK-981 restores cBAF complexes and blocks oncogenic transcription, offering a potential treatment strategy for SS.
  • TAK-981 is positioned for clinical use in treating SS, particularly in combination with chemotherapy.
Keywords:
BAF complexesDNA damageSUMOylationSWI/SNFTAK-981synovial sarcomatargeted therapy

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