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Structure specific DNA recognition by the SLX1-SLX4 endonuclease complex

Xiang Xu1,2, Mingzhu Wang3, Jixue Sun1

  • 1State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Key Laboratory of Medical Data Analysis and Statistical Research of Tianjin, Nankai University, Tianjin 300353, China.

Nucleic Acids Research
|June 28, 2021
PubMed

Insights

The SLX1-SLX4 complex uses SLX4's SAP domain to recognize 5'-flap DNA structures. This interaction is crucial for the complex to accurately process DNA damage and select cleavage sites.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • The SLX1-SLX4 complex is a structure-specific endonuclease.
  • It processes DNA damage, including Holliday junctions, stalled replication forks, and DNA flaps.
  • SLX1 requires SLX4 binding for activation, but the recognition mechanism is unclear.

Purpose of the Study:

  • To elucidate the mechanism by which the SLX1-SLX4 complex recognizes specific DNA structures.
  • To identify the role of SLX4 domains in DNA processing and cleavage site selection.

Main Methods:

  • Structural analysis (e.g., X-ray crystallography)
  • Biochemical assays
  • Computational modeling

Main Results:

  • The SAP domain of SLX4 is essential for 5"-flap DNA processing.
  • SLX4's SAP domain binds the minor groove of DNA near the flap junction.
  • The 5 -flap interacts with SLX1's core domain, explaining specific DNA recognition.

Conclusions:

  • The SLX1-SLX4 complex employs a specific binding mode involving SLX4's SAP domain and SLX1 for 5 -flap DNA recognition.
  • This mechanism ensures accurate processing of DNA damage intermediates and cleavage site specificity.

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