Heat shock factor 1 (HSF1) specifically potentiates c-MYC-mediated transcription independently of the canonical heat shock response.

Heat shock factor 1 (HSF1) specifically potentiates c-MYC-mediated transcription independently of the canonical heat shock response.
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DOI:
10.1016/j.celrep.2023.112557
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发表时间:
2023-06-27
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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--
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尽管c-myc在生物学中起着关键作用,但它的转录活性如何被定量调节仍然没有得到很好的解释。在这里,我们证明了热休克因子1(HSF1),热休克反应的主要转录调节因子,作为c-myc介导的转录的主要修饰物。HSF1缺乏会降低c-myc的DNA结合,抑制其全基因组的转录活性。从机制上讲,c-myc、MAX和HSF1在基因组DNA上组装成一个转录因子复合体,令人惊讶的是,HSF1的DNA结合是必不可少的。相反,HSF1物理招募组蛋白乙酰转移酶总控制的不可降压5(GCN5),促进组蛋白乙酰化和增强c-myc转录活性。因此,我们发现HSF1特异性地增强c-myc介导的转录,而不是它在对抗蛋白毒性应激中的典型作用。重要的是,这种作用机制产生了两种不同的c-myc激活状态,初级和晚期,这对适应不同的生理和病理条件可能是重要的。Xu等人。研究发现,在非应激条件下,HSF1、c-MYC和MAX构成一个转录因子复合体,这与热休克反应中HSF1同源三聚体的组装形成鲜明对比。HSF1在没有蛋白毒性应激的情况下发挥非规范的转录作用,在全基因组范围内放大c-myc介导的转录。
Despite its pivotal roles in biology, how the transcriptional activity of c-MYC is tuned quantitatively remains poorly defined. Here, we show that heat shock factor 1 (HSF1), the master transcriptional regulator of the heat shock response, acts as a prime modifier of the c-MYC-mediated transcription. HSF1 deficiency diminishes c-MYC DNA binding and dampens its transcriptional activity genome wide. Mechanistically, c-MYC, MAX, and HSF1 assemble into a transcription factor complex on genomic DNAs, and surprisingly, the DNA binding of HSF1 is dispensable. Instead, HSF1 physically recruits the histone acetyltransferase general control non-derepressible 5 (GCN5), promoting histone acetylation and augmenting c-MYC transcriptional activity. Thus, we find that HSF1 specifically potentiates the c-MYC-mediated transcription, discrete from its canonical role in countering proteotoxic stress. Importantly, this mechanism of action engenders two distinct c-MYC activation states, primary and advanced, which may be important to accommodate diverse physiological and pathological conditions. Xu et al. find that, under non-stressed conditions, HSF1, c-MYC, and MAX constitute a transcription factor complex, in sharp contrast with the assembly of HSF1 homotrimers during the heat shock response. HSF1 exerts a non-canonical transcriptional action in the absence of proteotoxic stress, amplifying c-MYC-mediated transcription genome wide.
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