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Related Experiment Video

Updated: Sep 28, 2025

In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
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RAD51 wrestles with SUMO.

Younghoon Kee1, Jung-Hee Lee2, Ho Jin You2

  • 1Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Republic of Korea.

Molecular & Cellular Oncology
|April 4, 2022
PubMed
Summary
This summary is machine-generated.

DNA repair involves RAD51 loading onto chromatin. TOPORS E3 SUMO ligase regulates RAD51 via SUMOylation, a process requiring ATM/ATR kinase activity for homologous recombination repair.

Keywords:
RAD51SUMO

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Area of Science:

  • Molecular Biology
  • DNA Repair Mechanisms
  • Cellular Signaling

Background:

  • RAD51 protein is crucial for homologous recombination (HR) DNA repair.
  • HR facilitates accurate repair of double-strand breaks.
  • Regulation of RAD51 chromatin loading is essential for HR efficiency.

Purpose of the Study:

  • To investigate a novel regulatory mechanism of RAD51.
  • To elucidate the role of TOPORS E3 SUMO ligase in RAD51 regulation.
  • To understand the involvement of ATM/ATR kinases in this process.

Main Methods:

  • Investigated RAD51 SUMOylation.
  • Assessed the role of TOPORS E3 SUMO ligase.
  • Analyzed the impact of ATM/ATR kinase activity on TOPORS and RAD51.

Main Results:

  • Identified a new mode of RAD51 regulation mediated by TOPORS E3 SUMO ligase.
  • Demonstrated that RAD51 SUMOylation is regulated by TOPORS.
  • Showed that ATM/ATR-dependent phosphorylation of TOPORS is required for RAD51 SUMOylation and subsequent chromatin loading.

Conclusions:

  • TOPORS E3 SUMO ligase plays a critical role in RAD51 regulation.
  • ATM/ATR kinases are involved in homologous recombination repair through TOPORS-mediated RAD51 SUMOylation.
  • This finding reveals a new layer of DNA damage response signaling in HR repair.