HSF1 phosphorylation establishes an active chromatin state via the TRRAP-TIP60 complex and promotes tumorigenesis.

HSF1 phosphorylation establishes an active chromatin state via the TRRAP-TIP60 complex and promotes tumorigenesis.
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DOI:
10.1038/s41467-022-32034-4
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发表时间:
2022-07-29
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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RNA聚合酶II的转录调控与染色质结构的变化有关。激活和启动子结合的热休克转录因子1(HSF 1)招募转录共激活因子,包括组蛋白修饰酶,然而,染色质开放的机制仍不清楚。在这里,我们证明,HSF 1招募的TRRAP-TIP 60乙酰转移酶复合物在热休克过程中的HSP 72启动子依赖于HSF 1-S419的磷酸化的方式。TRIM 33是一种含溴结构域的泛素连接酶,然后通过与HSF 1和TIP 60介导的乙酰化标记相互作用被募集到启动子,并与相关因子TRIM 24合作用于K120上组蛋白H2 B的单泛素化。这些组蛋白修饰的变化是由HSF 1-S419通过PLK 1磷酸化引发的,并稳定了HSP 72启动子中的HSF 1-转录复合物。此外,HSF 1-S419磷酸化在黑色素瘤细胞中组成性增强并促进其增殖。我们的研究结果提供了HSF 1磷酸化依赖的活性染色质状态的建立机制,这对肿瘤发生很重要。在这里,作者显示热休克因子1(HSF 1)在S419处通过染色质结合激酶PLK 1磷酸化,促进组蛋白乙酰转移酶和组蛋白乙酰化阅读蛋白TRIM 33和TRIM 24的HSF 1募集,实际上也在靶基因处执行组蛋白H2 BK 120单泛素化。此外,HSF 1磷酸化对黑色素瘤细胞增殖有影响。
Transcriptional regulation by RNA polymerase II is associated with changes in chromatin structure. Activated and promoter-bound heat shock transcription factor 1 (HSF1) recruits transcriptional co-activators, including histone-modifying enzymes; however, the mechanisms underlying chromatin opening remain unclear. Here, we demonstrate that HSF1 recruits the TRRAP-TIP60 acetyltransferase complex in HSP72 promoter during heat shock in a manner dependent on phosphorylation of HSF1-S419. TRIM33, a bromodomain-containing ubiquitin ligase, is then recruited to the promoter by interactions with HSF1 and a TIP60-mediated acetylation mark, and cooperates with the related factor TRIM24 for mono-ubiquitination of histone H2B on K120. These changes in histone modifications are triggered by phosphorylation of HSF1-S419 via PLK1, and stabilize the HSF1-transcription complex in HSP72 promoter. Furthermore, HSF1-S419 phosphorylation is constitutively enhanced in and promotes proliferation of melanoma cells. Our results provide mechanisms for HSF1 phosphorylation-dependent establishment of an active chromatin status, which is important for tumorigenesis. Here the authors show phosphorylation of heat shock factor 1 (HSF1) at S419 via the chromatin-bound kinase PLK1, promotes HSF1 recruitment of histone acetyltransferases and histone acetylation reader proteins TRIM33 and TRIM24, which actually also execute histone H2BK120 mono-ubiquitination at target genes. Furthermore, HSF1 phosphorylation has an impact on melanoma cell proliferation.
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