Colocalization of Sensors Is Sufficient to Activate the DNA Damage Checkpoint in the Absence of Damage

@article{citeulike:2775332, abstract = {Summary Previous work on the DNA damage checkpoint in Saccharomyces cerevisiae has shown that two complexes independently sense DNA lesions: the kinase Mec1-Ddc2 and the PCNA-like 9-1-1 complex. To test whether colocalization of these components is sufficient for checkpoint activation, we fused these checkpoint proteins to the LacI repressor and artificially colocalized these fusions by expressing them in cells harboring Lac operator arrays. We observed Rad53 and Rad9 phosphorylation, Sml1 degradation, and metaphase delay, demonstrating that colocalization of these sensors is sufficient to activate the checkpoint in the absence of DNA damage. Our tethering system allowed us to establish that CDK functions in the checkpoint pathway downstream of damage processing and checkpoint protein recruitment. This CDK dependence is likely, at least in part, through Rad9, since mutation of CDK consensus sites compromised its checkpoint function.}, author = {Bonilla, Carla Y. and Melo, Justine A. and Toczyski, David P. }, citeulike-article-id = {2775332}, doi = {http://dx.doi.org/10.1016/j.molcel.2008.03.023}, journal = {Molecular Cell}, keywords = {dna-damage}, month = {May}, number = {3}, pages = {267--276}, posted-at = {2008-05-09 12:43:14}, priority = {2}, title = {Colocalization of Sensors Is Sufficient to Activate the DNA Damage Checkpoint in the Absence of Damage}, url = {http://dx.doi.org/10.1016/j.molcel.2008.03.023}, volume = {30}, year = {2008} }

TY - JOUR ID - citeulike:2775332 L3 - citeulike-article-id:2775332 N2 - Summary Previous work on the DNA damage checkpoint in Saccharomyces cerevisiae has shown that two complexes independently sense DNA lesions: the kinase Mec1-Ddc2 and the PCNA-like 9-1-1 complex. To test whether colocalization of these components is sufficient for checkpoint activation, we fused these checkpoint proteins to the LacI repressor and artificially colocalized these fusions by expressing them in cells harboring Lac operator arrays. We observed Rad53 and Rad9 phosphorylation, Sml1 degradation, and metaphase delay, demonstrating that colocalization of these sensors is sufficient to activate the checkpoint in the absence of DNA damage. Our tethering system allowed us to establish that CDK functions in the checkpoint pathway downstream of damage processing and checkpoint protein recruitment. This CDK dependence is likely, at least in part, through Rad9, since mutation of CDK consensus sites compromised its checkpoint function. IS - 3 JF - Molecular Cell EP - 276 TI - Colocalization of Sensors Is Sufficient to Activate the DNA Damage Checkpoint in the Absence of Damage VL - 30 SP - 267 KW - dna-damage AU - Bonilla, Carla AU - Melo, Justine AU - Toczyski, David PY - 2008/05/09/ UR - http://dx.doi.org/10.1016/j.molcel.2008.03.023 ER -