title: Checkpoint Mec-tivation comes in many flavors.
abstract: In this issue of Molecular Cell, Navadgi-Patil and Burgers show that the budding yeast Mec1 kinase is activated by DNA damage through two distinct Ddc1-mediated mechanisms during G1 and G2 phases of the cell cycle.
authors.affiliation: Massachusetts General Hospital Cancer Center, Harvard Medical School, Charlestown, MA 02129, USA. zou.lee@mgh.harvard.edu
authors.forename: Lee
authors.initials: L
authors.lastname: Zou
mesh_terms: D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000502:physiology; D004249:DNA Damage; D004789:Enzyme Activation / Q000502:physiology; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism* / Q000502:physiology
chemical_list: D018797:Cell Cycle Proteins; C097185:DPB11 protein, S cerevisiae; C440013:Ddc1 protein, S cerevisiae; D047908:Intracellular Signaling Peptides and Proteins; D029701:Saccharomyces cerevisiae Proteins; C088937:MEC1 protein, S cerevisiae; D017346:Protein Serine-Threonine Kinases