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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Involvement of the PP2C-like phosphatase Ptc2p in the DNA checkpoint pathways of Saccharomyces cerevisiae.

RAD53 encodes a conserved protein kinase that acts as a central transducer in the DNA damage and the DNA replication checkpoint pathways in Saccharomyces cerevisiae. To identify new elements of these pathways acting with or downstream of RAD53, we searched for genes whose overexpression suppressed the toxicity of a dominant-lethal form of RAD53 and identified PTC2, which encodes a protein phosphatase of the PP2C family. PTC2 overexpression induces hypersensitivity to genotoxic agents in wild-type cells and is lethal to rad53, mec1, and dun1 mutants with low ribonucleotide reductase activity. Deleting PTC2 specifically suppresses the hydroxyurea hypersensitivity of mec1 mutants and the lethality of mec1Delta. PTC2 is thus implicated in one or several functions related to RAD53, MEC1, and the DNA checkpoint pathways.[1]


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