TY - JOUR
T1 - Histone H3 methylation links DNA damage detection to activation of the tumour suppressor Tip60
AU - Sun, Yingli
AU - Jiang, Xiaofeng
AU - Xu, Ye
AU - Ayrapetov, Marina K.
AU - Moreau, Lisa A.
AU - Whetstine, Johnathan R.
AU - Price, Brendan D.
PY - 2009
Y1 - 2009
N2 - DNA double-strand break (DSB) repair involves complex interactions between chromatin and repair proteins, including Tip60, a tumour suppressor. Tip60 is an acetyltransferase that acetylates both histones and ATM (ataxia telangiectasia mutated) kinase. Inactivation of Tip60 leads to defective DNA repair and increased cancer risk. However, how DNA damage activates the acetyltransferase activity of Tip60 is not known. Here, we show that direct interaction between the chromodomain of Tip60 and histone H3 trimethylated on lysine 9 (H3K9me3) at DSBs activates the acetyltransferase activity of Tip60. Depletion of intracellular H3K9me3 blocks activation of the acetyltransferase activity of Tip60, resulting in defective ATM activation and widespread defects in DSB repair. In addition, the ability of Tip60 to access H3K9me3 is dependent on the DNA damage-induced displacement of HP1β (heterochromatin protein 1β) from H3K9me3. Finally, we demonstrate that the Mre11-Rad50-Nbs1 (MRN) complex targets Tip60 to H3K9me3, and is required to activate the acetyltransferase activity of Tip60. These results reveal a new function for H3K9me3 in coordinating activation of Tip60-dependent DNA repair pathways, and imply that aberrant patterns of histone methylation may contribute to cancer by altering the efficiency of DSB repair.
AB - DNA double-strand break (DSB) repair involves complex interactions between chromatin and repair proteins, including Tip60, a tumour suppressor. Tip60 is an acetyltransferase that acetylates both histones and ATM (ataxia telangiectasia mutated) kinase. Inactivation of Tip60 leads to defective DNA repair and increased cancer risk. However, how DNA damage activates the acetyltransferase activity of Tip60 is not known. Here, we show that direct interaction between the chromodomain of Tip60 and histone H3 trimethylated on lysine 9 (H3K9me3) at DSBs activates the acetyltransferase activity of Tip60. Depletion of intracellular H3K9me3 blocks activation of the acetyltransferase activity of Tip60, resulting in defective ATM activation and widespread defects in DSB repair. In addition, the ability of Tip60 to access H3K9me3 is dependent on the DNA damage-induced displacement of HP1β (heterochromatin protein 1β) from H3K9me3. Finally, we demonstrate that the Mre11-Rad50-Nbs1 (MRN) complex targets Tip60 to H3K9me3, and is required to activate the acetyltransferase activity of Tip60. These results reveal a new function for H3K9me3 in coordinating activation of Tip60-dependent DNA repair pathways, and imply that aberrant patterns of histone methylation may contribute to cancer by altering the efficiency of DSB repair.
UR - http://www.scopus.com/inward/record.url?scp=70449518412&partnerID=8YFLogxK
U2 - 10.1038/ncb1982
DO - 10.1038/ncb1982
M3 - Article
C2 - 19783983
SN - 1465-7392
VL - 11
SP - 1376
EP - 1382
JO - Nature Cell Biology
JF - Nature Cell Biology
IS - 11
ER -