Structure of the p53/RNA polymerase II assembly.

Structure of the p53/RNA polymerase II assembly.
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DOI:
10.1038/s42003-021-01934-4
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发表时间:
2021-03-25
影响因子:
5.9
通讯作者:
Liu WL
Liu WL
中科院分区:
生物学2区
文献类型:
--
作者:
Liou SH;Singh SK;Singer RH;Coleman RA;Liu WL

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肿瘤抑制因子P53蛋白激活了一个庞大的基因网络的表达,以响应压力刺激以保持细胞的完整性。P53靶向RNA聚合酶II(POL II)调控转录的分子机制尚不清楚。为了阐明P53/Pol II的相互作用,我们用单粒子冷冻电子显微镜测定了人P53/Pol II组装的4.6?分辨率结构。我们的结构表明,P53‘S的DNA结合域定位于POL II的上游DNA结合部位,这种结合导致POL II钳的构象变化进入进一步关闭的状态。在P53和POL II之间发现了一个可能含有DNA的空腔。P53的反式激活结构域结合在Pol II的颌骨表面,与下游DNA接触。这些发现表明,P53的S功能结构域直接调节Pol II的DNA结合活性,从而介导转录,从而为研究P53调控的基因表达提供了新的思路。Liou等人。报道了用单粒子低温电子显微镜观察到的人类P53/RNA聚合酶II组件的4.6?分辨率结构。本研究提示,P53的S功能结构域调节核糖核酸聚合酶II的DNA结合活性,为研究P53调控的基因表达提供了新的思路。
The tumor suppressor p53 protein activates expression of a vast gene network in response to stress stimuli for cellular integrity. The molecular mechanism underlying how p53 targets RNA polymerase II (Pol II) to regulate transcription remains unclear. To elucidate the p53/Pol II interaction, we have determined a 4.6 Å resolution structure of the human p53/Pol II assembly via single particle cryo-electron microscopy. Our structure reveals that p53’s DNA binding domain targets the upstream DNA binding site within Pol II. This association introduces conformational changes of the Pol II clamp into a further-closed state. A cavity was identified between p53 and Pol II that could possibly host DNA. The transactivation domain of p53 binds the surface of Pol II’s jaw that contacts downstream DNA. These findings suggest that p53’s functional domains directly regulate DNA binding activity of Pol II to mediate transcription, thereby providing insights into p53-regulated gene expression. Liou et al. report a 4.6 Å resolution structure of the human p53/ RNA polymerase II assembly, using single particle cryoelectron microscopy. This study suggests that p53’s functional domains regulate the DNA binding activity of RNA polymerase II, providing insights into p53-regulated gene expression.
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