Abstract
Cells experiencing DNA replication stress activate a response pathway that delays entry into mitosis and promotes DNA repair and completion of DNA replication. The protein kinases ScRad53 and SpCds1 (in baker's and fission yeast, respectively) are central to this pathway. We describe a conserved protein Mrc1, mediator of the replication checkpoint, required for activation of ScRad53 and SpCds1 during replication stress. mrc1 mutants are sensitive to hydroxyurea and have a checkpoint defect similar to rad53 and cds1 mutants. Mrc1 may be the replicative counterpart of Rad9 and Crb2, which are required for activating ScRad53 and Chk1 in response to DNA damage.
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Accession codes
Accessions
GenBank/EMBL/DDBJ
Data deposits
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The nucleotide sequences of S. cerevisiae Mrc1 and S. pombe Mrc1 have been deposited at GenBank under accession numbers CAC42953.1 and 11359068, respectively.
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Acknowledgements
We thank S. Plon and her lab for allowing us to conduct several of these experiments in their facility, and P. Russell for sharing unpublished results. This work was supported by National Institutes of Health Grant GM44664 to S.J.E. and a Human Frontiers Science Programme RGO 178/2000 M to A.C. S.J.E. is an Investigator with the Howard Hughes Medical Institute, The Welch Chair of Biochemistry and Senior Scholar of the Ellison Foundation. A.J.O. was supported by the NIGMS T32 GM08307-11 training grant. Correspondence and requests for materials should be addressed to S.J.E.
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Alcasabas, A., Osborn, A., Bachant, J. et al. Mrc1 transduces signals of DNA replication stress to activate Rad53. Nat Cell Biol 3, 958–965 (2001). https://doi.org/10.1038/ncb1101-958
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DOI: https://doi.org/10.1038/ncb1101-958
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