The SIRT2 deacetylase regulates autoacetylation of p300.

The SIRT2 deacetylase regulates autoacetylation of p300.
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DOI:
10.1016/j.molcel.2008.09.018
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发表时间:
2008-11-07
期刊:
影响因子:
16
通讯作者:
Carey, Michael
Carey, Michael
中科院分区:
生物学1区
文献类型:
--
作者:
Black, Joshua C.;Mosley, Amber;Kitada, Tasuku;Washburn, Michael;Carey, Michael

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p300组蛋白乙酰转移酶的自动乙酰化控制着VP 16介导的染色质乙酰化和前起始复合物(PIC)组装之间的转换。目前,尚不清楚自乙酰化的p300是否以及如何脱乙酰化。我们发现NAD+依赖性组蛋白脱乙酰酶SIRT 2在体外和细胞中使p300脱乙酰化。SIRT 2使p300催化结构域中的赖氨酸残基脱乙酰并恢复p300与PIC的结合。RNAi介导的细胞中SIRT 2的消耗或化学抑制导致乙酰化p300的积累。SIRT 2缺失细胞中ac-p300/p300比率的改变导致p300向整合的VP 16应答基因的募集减少和转录抑制。我们的结论是,p300经历了一个动态循环的自动乙酰化和脱乙酰化。
Autoacetylation of the p300 histone acetyltransferase controls the transition between VP16-mediated chromatin acetylation and preinitiation complex (PIC) assembly. Currently, it is unknown if and how autoacetylated p300 is deacetylated. We found that the NAD+-dependent histone deacetylase SIRT2 deacetylates p300 in vitro and in cells. SIRT2 deacetylates lysine residues in the catalytic domain of p300 and restores binding of p300 to the PIC. RNAi-mediated depletion or chemical inhibition of SIRT2 in cells results in accumulation of acetylated p300. The altered ac-p300/p300 ratio in SIRT2-depleted cells results in decreased p300 recruitment to an integrated VP16-responsive gene and inhibition of transcription. We conclude that p300 undergoes a dynamic cycle of autoacetylation and deacetylation.
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