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Human RAD50 makes a functional DNA-binding complex.

Eri Kinoshita1, Sari van Rossum-Fikkert1, Humberto Sanchez1

  • 1Department of Genetics, Cancer Genomics Center, Erasmus MC, PO Box 2040, 3000 CA Rotterdam, The Netherlands.

Biochimie
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The RAD50 protein binds ATP and DNA, undergoing conformational changes. MRE11 protein is crucial for maintaining RAD50

Keywords:
Atomic force microscopyDNA break repairMR(N) complexRAD50 purificationScanning force microscopy

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Area of Science:

  • Molecular Biology
  • DNA Repair Mechanisms

Background:

  • The MRE11-RAD50-NBS1 (MRN) complex is vital for DNA repair pathways like non-homologous end-joining (NHEJ) and homologous recombination (HR).
  • Understanding the specific biochemical activities and functional roles of individual components within the MRN complex is challenging due to their interdependence.

Purpose of the Study:

  • To investigate the biochemical properties and DNA-binding capabilities of purified human RAD50 protein independently.
  • To elucidate the role of MRE11 in the structural organization and functional activity of the RAD50 component within the MRN complex.

Main Methods:

  • Purification of human RAD50 protein.
  • Biochemical assays to assess ATP binding, ATPase activity, and conformational changes.
  • Scanning force microscopy to analyze RAD50-DNA interactions and multimerization.
  • Comparison of RAD50 alone versus RAD50 within the MRN complex.

Main Results:

  • Purified RAD50 binds ATP and exhibits ATPase activity, with ATP inducing conformational changes and multimerization.
  • RAD50 binds DNA, but not as oligomers, and is insufficient for DNA tethering on its own.
  • ATP-induced RAD50 multimers are globular and lack extended coiled coils, unlike those observed in the intact MRN complex.

Conclusions:

  • MRE11 plays a critical role in organizing RAD50 structure, particularly in aligning coiled coils in the ATP-bound state.
  • The findings highlight the importance of MRE11 in ensuring the proper structural and functional integrity of the RAD50 component within the MRN complex during DNA repair.