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Regulation of the Fanconi anemia pathway by a SUMO-like delivery network

Kailin Yang1, George-Lucian Moldovan, Patrizia Vinciguerra

  • 1Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA;

Genes & Development
|September 8, 2011
PubMed

Insights

The USP1/UAF1 complex targets DNA repair proteins FANCD2 and PCNA via SUMO-like domain interactions. This mechanism coordinates DNA cross-link repair and translesion DNA synthesis.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • The USP1/UAF1 complex is crucial for DNA repair, deubiquitinating Fanconi anemia protein FANCD2 to promote homologous recombination and DNA cross-link repair.
  • The precise mechanism by which USP1/UAF1 is recruited to its substrates, FANCD2/FANCI heterodimer and PCNA-Ub, remained unclear.

Purpose of the Study:

  • To elucidate the targeting mechanism of the USP1/UAF1 complex to its DNA repair substrates.
  • To investigate the role of SUMO-like domain (SLD) and SUMO-like domain-interacting motif (SIM) interactions in DNA repair pathway coordination.

Main Methods:

  • Investigated UAF1 protein structure, identifying tandem SUMO-like domains (SLD1 and SLD2).
  • Utilized deletion and mutation analyses to assess the binding of UAF1 SLD2 to FANCI SIM and hELG1 SIM.
  • Examined the impact of these interactions on FANCD2 deubiquitination, DNA repair, and PCNA-Ub deubiquitination.

Main Results:

  • UAF1 possesses SLD1 and SLD2 domains; SLD2 directly binds to a SIM on FANCI, essential for USP1/UAF1 recruitment to FANCD2.
  • Disruption of SLD2-FANCI or SLD2-hELG1 interactions impaired FANCD2 deubiquitination and DNA repair.
  • UAF1 SLD2 also binds to a SIM on hELG1, mediating USP1/UAF1 targeting to PCNA-Ub for deubiquitination.

Conclusions:

  • The study reveals that SLD-SIM interactions mediate the specific targeting of USP1/UAF1 to FANCD2-Ub and PCNA-Ub substrates.
  • This regulated targeting mechanism is critical for coordinating homologous recombination and translesion DNA synthesis pathways.

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