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Budding Yeast Sae2 is an In Vivo Target of the Mec1 and Tel1 Checkpoint Kinases During Meiosis
Hugo Cartagena-Lirola, Ilaria Guerini, Valeria Viscardi, Giovanna Lucchini and Maria Pia Longhese
volume 5 | issue 14
15 july 2006Pages: 1549 - 1559
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DNA double-strand breaks (DSBs) are introduced into the genome to initiate meiotic recombination. Their accurate repair is monitored by the meiotic recombination checkpoint that prevents nuclear division until completion of meiotic DSB repair. We show that the Saccharomyces cerevisiae Sae2 protein, known to be involved in processing meiotic DSBs, is phosphorylated periodically during the meiotic cycle. Sae2 phosphorylation occurs at the onset of premeiotic S phase, is maximal at the time of meiotic DSB generation and decreases when DSBs are repaired by homologous recombination. Hyperactivation of the meiotic recombination checkpoint caused by the failure to repair DSBs results in accumulation and persistence of phosphorylated Sae2, indicating a possible link between checkpoint activation and meiosis-induced Sae2 phosphorylation. Accordingly, Sae2 phosphorylation depends on the checkpoint kinases Mec1 and Tel1, whose simultaneous deletion also impairs meiotic DSB repair. Moreover, replacing with alanines the Sae2 serine and threonine residues belonging to Mec1/Tel1-dependent putative phosphorylation sites impairs not only Sae2 phosphorylation during meiosis, but also meiotic DSB repair. Thus, checkpoint-mediated phosphorylation of Sae2 is important to support its meiotic recombination functions.
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDF If the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.