Protein phosphatase 1γ is responsible for dephosphorylation of histone H3 at Thr 11 after DNA damage.
The DNA-damage-induced transcriptional suppression of cell cycle regulatory genes correlates with a reduction in histone H3-Thr 11 phosphorylation (H3-pThr 11) on their promoters that is partly mediated by the dissociation of Chk1 from chromatin. In this study, we identify protein phosphatase 1γ (PP1γ) as a phosphatase responsible for DNA-damage-induced H3-pThr 11 dephosphorylation. PP1γ is activated after DNA damage, which is mainly mediated by a reduction in Cdk-dependent phosphorylation of PP1γ at Thr 311. The depletion of PP1γ sensitizes HCT116 cells to DNA damage. Our results suggest that the ataxia telangiectasia, mutated and Rad3-related-Chk1 axis regulates H3-pThr 11 dephosphorylation on DNA damage, at least in part by the activation of PP1γ through Chk1-dependent inhibition of Cdks.
Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan.
Midori
M
Shimada
Mayumi
M
Haruta
Hiroyuki
H
Niida
Kazunobu
K
Sawamoto
Makoto
M
Nakanishi
D000818:Animals; D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins / Q000378:metabolism; D000071877:Checkpoint Kinase 1; D002843:Chromatin / Q000378:metabolism; D004249:DNA Damage; D045325:HCT116 Cells; D006367:HeLa Cells; D006657:Histones / Q000378:metabolism*; D006801:Humans; D051379:Mice; D008954:Models, Biological; D019319:Okadaic Acid / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D011494:Protein Kinases / Q000378:metabolism; D054645:Protein Phosphatase 1 / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D013912:Threonine / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects
D018797:Cell Cycle Proteins; D002843:Chromatin; D006657:Histones; D019319:Okadaic Acid; D013912:Threonine; D011494:Protein Kinases; C576597:ATR protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; C000605867:CHEK1 protein, human; D000071877:Checkpoint Kinase 1; C000605869:Chek1 protein, mouse; D017346:Protein Serine-Threonine Kinases; D054645:Protein Phosphatase 1