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
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中科院分区:
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--
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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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DOI:
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发表时间:
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期刊:
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影响因子:
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