Download MendeleyThe structure of Escherichia coli RusA endonuclease reveals a new Holliday junction DNA binding fold
Rafferty, J.B., Bolt, E.L., Muranova, T.A., Sedelnikova, S.E., Leonard, P., Pasquo, A., Baker, P.J., Rice, D.W., Sharples, G.J., Lloyd, R.G.(2003) Structure 11: 1557-1567
- PubMed: 14656440
- DOI: https://doi.org/10.1016/j.str.2003.11.004
- Primary Citation of Related Structures:
1Q8R - PubMed Abstract:
Holliday junction resolution performed by a variety of structure-specific endonucleases is a key step in DNA recombination and repair. It is believed that all resolvases carry out their reaction chemistries in a similar fashion, utilizing a divalent cation to facilitate the hydrolysis of the phosphodiester backbone of the DNA, but their architecture varies. To date, with the exception of bacteriophage T4 endonuclease VII, each of the known resolvase enzyme structures has been categorized into one of two families: the integrases and the nucleases. We have now determined the structure of the Escherichia coli RusA Holliday junction resolvase, which reveals a fourth structural class for these enzymes. The structure suggests that dimer formation is essential for Mg(2+) cation binding and hence catalysis and that like the other resolvases, RusA distorts its Holliday junction target upon binding. Key residues identified by mutagenesis experiments are well positioned to interact with the DNA.
Organizational Affiliation:
Krebs Institute, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom. j.rafferty@sheffield.ac.uk
