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Multiple direct interactions of TBP with the MYC oncoprotein.
Nature Structural & Molecular Biology ( IF 12.5 ) Pub Date : 2019-11-04 , DOI: 10.1038/s41594-019-0321-z
Yong Wei 1, 2, 3 , Diana Resetca 2, 4 , Zhe Li 5 , Isak Johansson-Åkhe 1 , Alexandra Ahlner 1 , Sara Helander 1 , Amelie Wallenhammar 1 , Vivian Morad 1 , Brian Raught 2, 4 , Björn Wallner 1 , Tetsuro Kokubo 5 , Yufeng Tong 3, 6 , Linda Z Penn 2, 4 , Maria Sunnerhagen 1
Affiliation  

Transcription factor c-MYC is a potent oncoprotein; however, the mechanism of transcriptional regulation via MYC-protein interactions remains poorly understood. The TATA-binding protein (TBP) is an essential component of the transcription initiation complex TFIID and is required for gene expression. We identify two discrete regions mediating MYC-TBP interactions using structural, biochemical and cellular approaches. A 2.4 -Å resolution crystal structure reveals that human MYC amino acids 98-111 interact with TBP in the presence of the amino-terminal domain 1 of TBP-associated factor 1 (TAF1TAND1). Using biochemical approaches, we have shown that MYC amino acids 115-124 also interact with TBP independently of TAF1TAND1. Modeling reveals that this region of MYC resembles a TBP anchor motif found in factors that regulate TBP promoter loading. Site-specific MYC mutants that abrogate MYC-TBP interaction compromise MYC activity. We propose that MYC-TBP interactions propagate transcription by modulating the energetic landscape of transcription initiation complex assembly.

中文翻译:

TBP 与 MYC 癌蛋白的多重直接相互作用。

转录因子 c-MYC 是一种有效的癌蛋白;然而,通过MYC-蛋白质相互作用进行转录调控的机制仍然知之甚少。TATA 结合蛋白 (TBP) 是转录起始复合物 TFIID 的重要组成部分,是基因表达所必需的。我们使用结构、生化和细胞方法确定了两个介导 MYC-TBP 相互作用的离散区域。2.4 Å 分辨率晶体结构表明,在 TBP 相关因子 1 (TAF1TAND1) 的氨基末端结构域 1 存在下,人类 MYC 氨基酸 98-111 与 TBP 相互作用。使用生化方法,我们已经证明 MYC 氨基酸 115-124 也独立于 TAF1TAND1 与 TBP 相互作用。建模表明,MYC 的这个区域类似于在调节 TBP 启动子加载的因子中发现的 TBP 锚定基序。消除 MYC-TBP 相互作用的位点特异性 MYC 突变体会​​损害 MYC 活性。我们建议 MYC-TBP 相互作用通过调节转录起始复合物组装的能量景观来传播转录。
更新日期:2019-11-04
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