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DNA structural elements required for ERCC1-XPF endonuclease activity

W L de Laat1, E Appeldoorn, N G Jaspers

  • 1Department of Cell Biology and Genetics, Medical Genetics Centre, Erasmus University, P. O. Box 1738, 3000 DR Rotterdam, The Netherlands.

The Journal of Biological Chemistry
|May 9, 1998
PubMed
Summary
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The ERCC1-XPF endonuclease complex intrinsically cleaves DNA structures, requiring unpaired nucleotides and single-stranded DNA arms for precise incisions. This clarifies its role in DNA repair and recombination processes.

Area of Science:

  • Molecular Biology
  • DNA Repair Mechanisms
  • Enzymology

Background:

  • The ERCC1-XPF complex is a structure-specific endonuclease crucial for nucleotide excision repair (NER) in mammals.
  • It is also implicated in repairing DNA cross-links and homologous recombination, similar to yeast Rad1-Rad10.

Purpose of the Study:

  • To investigate the DNA structural requirements for ERCC1-XPF's endonucleolytic activity.
  • To elucidate the complex's intrinsic function in DNA repair and recombination.

Main Methods:

  • Purification of recombinant ERCC1-XPF from insect cells.
  • Assaying endonucleolytic activity on various DNA substrates (stem-loop, splayed arm, flap).
  • Analyzing cleavage site specificity and dependence on divalent cations and DNA structure.

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Main Results:

  • ERCC1-XPF exhibits intrinsic structure-specific endonuclease activity, independent of other proteins like replication protein A.
  • Cleavage occurs at the junction of duplex and single-stranded DNA, requiring 4-8 unpaired nucleotides.
  • Optimal cleavage is observed in low Mn2+ concentrations (0.2 mM).
  • Incisions are made on one strand at the 5' side of the junction, removing 3' protruding single-stranded arms.

Conclusions:

  • The study precisely defines the DNA structural elements necessary for ERCC1-XPF's endonucleolytic activity.
  • Findings confirm ERCC1-XPF's intrinsic role in NER and provide a basis for further research into its recombinational functions.