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The Nse5-Nse6 dimer mediates DNA repair roles of the Smc5-Smc6 complex.

Mol. Cell. Biol.2006 Mar;26(5):1617-30
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摘要


Stabilization and processing of stalled replication forks is critical for cell survival and genomic integrity. We characterize a novel DNA repair heterodimer of Nse5 and Nse6, which are nonessential nuclear proteins critical for chromosome segregation in fission yeast. The Nse5/6 dimer facilitates DNA repair as part of the Smc5-Smc6 holocomplex (Smc5/6), the basic architecture of which we define. Nse5-Nse6 [corrected] (Nse5 and Nse6) [corrected] mutants display a high level of spontaneous DNA damage and mitotic catastrophe in the absence of the master checkpoint regulator Rad3 (hATR). Nse5/6 mutants are required for the response to genotoxic agents that block the progression of replication forks, acting in a pathway that allows the tolerance of irreparable UV lesions. Interestingly, the UV sensitivity of Nse5/6 [corrected] is suppressed by concomitant deletion of the homologous recombination repair factor, Rhp51 (Rad51). Further, the viability of Nse5/6 mutants depends on Mus81 and Rqh1, factors that resolve or prevent the formation of Holliday junctions. Consistently, the UV sensitivity of cells lacking Nse5/6 can be partially suppressed by overexpressing the bacterial resolvase RusA. We propose a role for Nse5/6 mutants in suppressing recombination that results in Holliday junction formation or in Holliday junction resolution.

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