3DSC

Crystal structure of P. furiosus Mre11 DNA synaptic complex

Summary for 3DSC

• Entry DOI: 10.2210/pdb3dsc/pdb
• Related: 1II7 1s8e 3DSD
• Descriptor: DNA double-strand break repair protein mre11, DNA (5'-D(P*DCP*DAP*DCP*DAP*DAP*DGP*DCP*DTP*DTP*DTP*DTP*DGP*DCP*DTP*DTP*DGP*DTP*DGP*DAP*DC)-3') (3 entities in total)
• Functional Keywords: protein-dna complex, double helix, nuclease, dna damage, dna repair, endonuclease, exonuclease, hydrolase, manganese, metal-binding, hydrolase-dna complex, hydrolase/dna
• Biological source: Pyrococcus furiosus
• Total number of polymer chains: 2
• Total formula weight: 47020.61

Authors

Williams, R.S.,Moncalian, G.,Shin, D.S.,Tainer, J.A. (deposition date: 2008-07-11, release date: 2008-10-14, Last modification date: 2023-08-30)

Primary citation

Williams, R.S.,Moncalian, G.,Williams, J.S.,Yamada, Y.,Limbo, O.,Shin, D.S.,Groocock, L.M.,Cahill, D.,Hitomi, C.,Guenther, G.,Moiani, D.,Carney, J.P.,Russell, P.,Tainer, J.A.
Mre11 dimers coordinate DNA end bridging and nuclease processing in double-strand-break repair.
Cell(Cambridge,Mass.), 135:97-109, 2008

PubMed Abstract: Mre11 forms the core of the multifunctional Mre11-Rad50-Nbs1 (MRN) complex that detects DNA double-strand breaks (DSBs), activates the ATM checkpoint kinase, and initiates homologous recombination (HR) repair of DSBs. To define the roles of Mre11 in both DNA bridging and nucleolytic processing during initiation of DSB repair, we combined small-angle X-ray scattering (SAXS) and crystal structures of Pyrococcus furiosus Mre11 dimers bound to DNA with mutational analyses of fission yeast Mre11. The Mre11 dimer adopts a four-lobed U-shaped structure that is critical for proper MRN complex assembly and for binding and aligning DNA ends. Further, mutations blocking Mre11 endonuclease activity impair cell survival after DSB induction without compromising MRN complex assembly or Mre11-dependant recruitment of Ctp1, an HR factor, to DSBs. These results show how Mre11 dimerization and nuclease activities initiate repair of DSBs and collapsed replication forks, as well as provide a molecular foundation for understanding cancer-causing Mre11 mutations in ataxia telangiectasia-like disorder (ATLD).

PubMed: 18854158
DOI: 10.1016/j.cell.2008.08.017

Experimental method

X-RAY DIFFRACTION (2.7 Å)