Abstract
Deletion of Ppm1d, the gene encoding the Wip1 phosphatase, renders cells resistant to transformation and mice resistant to tumor development. Here, we report that deficiency of Wip1 resulted in activation of the ataxia-telangiectasia mutated (ATM) kinase. In turn, overexpression of Wip1 was sufficient to reduce activation of the ATM-dependent signaling cascade after DNA damage. Wip1 dephosphorylated ATM Ser1981, a site critical for ATM monomerization and activation, and was critical for resetting ATM phosphorylation as cells repaired damaged DNA. We propose that the Wip1 phosphatase is an integral component of an ATM-dependent signaling pathway.
Publication types
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Research Support, N.I.H., Intramural
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Animals
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Ataxia Telangiectasia Mutated Proteins
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Cell Cycle Proteins / metabolism*
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DNA Damage / genetics
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DNA-Binding Proteins / metabolism*
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HeLa Cells
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Humans
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Kinetics
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Mice
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Neoplasm Proteins / deficiency
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Neoplasm Proteins / metabolism*
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Phosphopeptides / metabolism
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Phosphoprotein Phosphatases / deficiency
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Phosphoprotein Phosphatases / metabolism*
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Phosphorylation / radiation effects
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Phosphoserine / metabolism
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Protein Phosphatase 2C
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Protein Serine-Threonine Kinases / metabolism*
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Radiation, Ionizing
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Signal Transduction* / radiation effects
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Tumor Cells, Cultured
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Tumor Suppressor Protein p53
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Tumor Suppressor Proteins / metabolism*
Substances
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Cell Cycle Proteins
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DNA-Binding Proteins
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Neoplasm Proteins
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Phosphopeptides
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Tumor Suppressor Protein p53
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Tumor Suppressor Proteins
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Phosphoserine
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ATM protein, human
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Ataxia Telangiectasia Mutated Proteins
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Atm protein, mouse
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Protein Serine-Threonine Kinases
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PPM1D protein, human
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Phosphoprotein Phosphatases
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Ppm1d protein, mouse
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Protein Phosphatase 2C