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The MRE11-RAD50-NBS1 (MRN) protein complex plays a vital role in DNA double strand break sensing, signaling, and repair. Mutation in any component of this complex may lead to disease as disrupting DNA double strand break repair has the potential to cause translocations and loss of genomic information. Here, we have investigated an MRE11 mutation, F237C, identified in a breast cancer tumor. We found that the analogous mutant of Pyrococcus furiosus Mre11 diminishes both the exonuclease and endonuclease activities of Mre11 in vitro. Solution
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