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The MRX complex regulates Exo1 resection activity by altering DNA end structure.

Elisa Gobbini1, Corinne Cassani1, Jacopo Vertemara1

  • 1Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milan, Italy.

The EMBO Journal
|June 22, 2018
PubMed
Summary

The Mre11-Rad50-Xrs2 (MRX) complex accelerates DNA double-strand break (DSB) repair by enhancing Exo1 nuclease activity. A specific Mre11 mutation (R10T) reveals how MRX processes DNA ends to promote DSB resection.

Keywords:
MRXExo1Sae2double‐strand breakresection

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Area of Science:

  • Molecular Biology
  • DNA Repair Mechanisms
  • Biochemistry

Background:

  • Homologous recombination initiates with DNA double-strand break (DSB) resection.
  • The Mre11-Rad50-Xrs2 (MRX) complex is crucial for DSB resection, but its mechanism involving Exo1 nuclease is not fully understood.

Purpose of the Study:

  • To investigate the role of the MRX complex in promoting Exo1 nuclease activity during DSB resection.
  • To elucidate the structural and functional consequences of a specific Mre11 mutation (R10T) on DSB processing.

Main Methods:

  • Characterization of the Mre11-R10T mutant in DSB resection assays.
  • Analysis of Ku complex association with DSBs.
  • Molecular dynamics simulations of Mre11-DNA interactions.

Main Results:

  • The Mre11-R10T mutant significantly accelerates DSB resection by potentiating Exo1 activity.
  • Increased Exo1 resection reduces Ku complex association with DSBs, particularly in G1 phase.
  • Molecular dynamics simulations reveal that the R10T substitution alters Mre11 capping domain orientation, causing persistent DNA end melting.

Conclusions:

  • MRX complex establishes a specific DNA end structure that enhances Exo1 resection by maintaining its association with DSB ends.
  • Exo1 plays a direct role in preventing Ku complex binding to DSBs.
  • This study uncovers a novel function of the MRX complex in regulating DSB resection dynamics.