Inter-subunit interactions that coordinate Rad51's activities

Arabela A. Grigorescu, Joseph H A Vissers, Dejan Ristic, Ying Z. Pigli, Thomas W. Lynch, Claire Wyman, Phoebe A. Rice*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Rad51 is the central catalyst of homologous recombination in eukaryotes and is thus critical for maintaining genomic integrity. Recent crystal structures of filaments formed by Rad51 and the closely related archeal RadA and eubacterial RecA proteins place the ATPase site at the protomeric interface. To test the relevance of this feature, we mutated conserved residues at this interface and examined their effects on key activities of Rad51: ssDNA-stimulated ATP hydrolysis, DNA binding, polymerization on DNA substrates and catalysis of strand-exchange reactions. Our results show that the interface seen in the crystal structures is very important for nucleoprotein filament formation. H352 and R357 of yeast Rad51 are essential for assembling the catalytically competent form of the enzyme on DNA substrates and coordinating its activities. However, contrary to some previous suggestions, neither of these residues is critical for ATP hydrolysis.

Original languageEnglish (US)
Pages (from-to)557-567
Number of pages11
JournalNucleic acids research
Volume37
Issue number2
DOIs
StatePublished - 2009

ASJC Scopus subject areas

  • Genetics

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