Abstract
The MRN (Mre11-Rad50-Nbs1)-ATM (ataxia-telangiectasia mutated) pathway is essential for sensing and signaling from DNA double-strand breaks. The MRN complex acts as a DNA damage sensor, maintains genome stability during DNA replication, promotes homology-dependent DNA repair and activates ATM. MRN is essential for cell viability, which has limited functional studies of the complex. Small-molecule inhibitors of MRN could circumvent this experimental limitation and could also be used as cellular radio- and chemosensitization compounds. Using cell-free systems that recapitulate faithfully the MRN-ATM signaling pathway, we designed a forward chemical genetic screen to identify inhibitors of the pathway, and we isolated Z-5-(4-hydroxybenzylidene)-2-imino-1,3-thiazolidin-4-one (mirin, 1) as an inhibitor of MRN. Mirin prevents MRN-dependent activation of ATM without affecting ATM protein kinase activity, and it inhibits Mre11-associated exonuclease activity. Consistent with its ability to target the MRN complex, mirin abolishes the G2/M checkpoint and homology-dependent repair in mammalian cells.
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Change history
13 February 2009
In the version of this article initially published, the reported chemical structure and systematic name for mirin (compound 1), identified from a high-throughput screen, were incorrectly assigned in the commercial library. Investigations by Gartner, Pletnev and Eastman (Correspondence: Nat. Chem. Biol. 5, 129-130, 2009), which have been confirmed by us (Response: Nat. Chem. Biol. 5, 130, 2009), have identified the correct structure of mirin. The systematic name and chemical structure for mirin have been corrected in the HTML and PDF versions of the article, and in the graphical abstract and the PubChem database.
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Acknowledgements
We thank H. Lindsay for Chk2 antibody and B. Stockwell, O. Haccard and the members of the Gautier laboratory for helpful discussions. We thank G. Smith (KuDOS Pharmaceuticals) for the inhibitor KU-55933. We are indebted to J. Decatur and Y. Itagaki of the Chemistry Department for providing NMR and mass spectral analysis of mirin. This work was supported by US National Institutes of Health grants CA95866 and CA92245 (J. Gautier), CA97403 (R. Baer) and GM54668 (M. Jasin).
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Dupré, A., Boyer-Chatenet, L., Sattler, R. et al. A forward chemical genetic screen reveals an inhibitor of the Mre11–Rad50–Nbs1 complex. Nat Chem Biol 4, 119–125 (2008). https://doi.org/10.1038/nchembio.63
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DOI: https://doi.org/10.1038/nchembio.63
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