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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
06:24

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Published on: February 13, 2019

Inter-subunit interactions that coordinate Rad51's activities.

Arabela A Grigorescu1, Joseph H A Vissers, Dejan Ristic

  • 1Department of Biochemistry, Molecular Biology and Cell Biology, The University of Chicago, Chicago, IL 60637, USA.

Nucleic Acids Research
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

Mutations in key Rad51 protein interfaces are crucial for DNA repair filament formation and enzyme coordination. These changes affect DNA binding and polymerization but not ATP hydrolysis, maintaining genomic integrity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Rad51 protein is central to homologous recombination, a vital process for maintaining genomic integrity in eukaryotes.
  • Crystal structures suggest the ATPase site, crucial for Rad51 function, is located at the protomeric interface.

Purpose of the Study:

  • To investigate the functional significance of the protomeric interface in Rad51 activity.
  • To determine the role of conserved residues at the interface in DNA binding, polymerization, ATP hydrolysis, and strand exchange.

Main Methods:

  • Site-directed mutagenesis of conserved residues (H352, R357) at the yeast Rad51 protomeric interface.
  • Assays to measure ssDNA-stimulated ATP hydrolysis, DNA binding, protein polymerization on DNA, and strand-exchange catalysis.

Main Results:

  • The protomeric interface is essential for the formation of functional Rad51 nucleoprotein filaments on DNA.
  • Mutations H352 and R357 significantly impair the assembly of catalytically competent Rad51 on DNA substrates.
  • These mutations do not critically affect the ATP hydrolysis activity of Rad51, contrary to prior hypotheses.

Conclusions:

  • The protomeric interface plays a critical role in Rad51 filament formation and the coordination of its enzymatic activities during homologous recombination.
  • Specific residues at the interface are essential for proper enzyme assembly on DNA but not for ATP hydrolysis itself.