Publication Date:
2012-11-20
Description:
In response to genotoxic stress, a transient arrest in cell-cycle progression enforced by the DNA-damage checkpoint (DDC) signalling pathway positively contributes to genome maintenance. Because hyperactivated DDC signalling can lead to a persistent and detrimental cell-cycle arrest, cells must tightly regulate the activity of the kinases involved in this pathway. Despite their importance, the mechanisms for monitoring and modulating DDC signalling are not fully understood. Here we show that the DNA-repair scaffolding proteins Slx4 and Rtt107 prevent the aberrant hyperactivation of DDC signalling by lesions that are generated during DNA replication in Saccharomyces cerevisiae. On replication stress, cells lacking Slx4 or Rtt107 show hyperactivation of the downstream DDC kinase Rad53, whereas activation of the upstream DDC kinase Mec1 remains normal. An Slx4-Rtt107 complex counteracts the checkpoint adaptor Rad9 by physically interacting with Dpb11 and phosphorylated histone H2A, two positive regulators of Rad9-dependent Rad53 activation. A decrease in DDC signalling results from hypomorphic mutations in RAD53 and H2A and rescues the hypersensitivity to replication stress of cells lacking Slx4 or Rtt107. We propose that the Slx4-Rtt107 complex modulates Rad53 activation by a competition-based mechanism that balances the engagement of Rad9 at replication-induced lesions. Our findings show that DDC signalling is monitored and modulated through the direct action of DNA-repair factors.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3536934/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3536934/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ohouo, Patrice Y -- Bastos de Oliveira, Francisco M -- Liu, Yi -- Ma, Chu Jian -- Smolka, Marcus B -- F31 GM093588/GM/NIGMS NIH HHS/ -- F31-GM093588/GM/NIGMS NIH HHS/ -- R01 GM097272/GM/NIGMS NIH HHS/ -- R01-GM097272/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2013 Jan 3;493(7430):120-4. doi: 10.1038/nature11658. Epub 2012 Nov 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, New York 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23160493" target="_blank"〉PubMed〈/a〉
Keywords:
Binding, Competitive
;
Cell Cycle Checkpoints/*physiology
;
Cell Cycle Proteins/antagonists & inhibitors/deficiency/genetics/*metabolism
;
Checkpoint Kinase 2
;
DNA Damage/drug effects
;
DNA Repair/drug effects/*physiology
;
DNA Replication/drug effects
;
Endodeoxyribonucleases/deficiency/metabolism
;
Enzyme Activation
;
Histones/chemistry/genetics/metabolism
;
Hydroxyurea/pharmacology
;
Intracellular Signaling Peptides and Proteins/metabolism
;
Mutation
;
Nuclear Proteins/deficiency/metabolism
;
Phosphorylation
;
Protein Binding
;
Protein-Serine-Threonine Kinases/genetics/metabolism
;
Saccharomyces cerevisiae/*cytology/drug effects/genetics/*metabolism
;
Saccharomyces cerevisiae Proteins/genetics/metabolism
;
Signal Transduction
;
Stress, Physiological/drug effects
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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