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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
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通过乙化调节的p53和SET之间的相互作用显示出广泛的调节模式
Donglai Wang1, Ning Kon1, Gorka Lasso2
1Institute for Cancer Genetics, Department of Pathology and Cell Biology, Herbert Irving Comprehensive Cancer Center, College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY 10032, USA.
Nature
|September 15, 2016
概括
瘤蛋白SET蛋白与未乙化p53结合,抑制其活性. 压力诱导的p53CTD乙化破坏了这种结合,激活了p53并导致瘤回归,揭示了新的调节机制.
科学领域:
- 生物化学
- 分子生物学
- 表观遗传学
背景情况:
- 素乙化是调节蛋白质功能的关键翻译后修饰.
- 在蛋白相互作用和功能中,p53 (也称为TP53) 的C端域 (CTD) 乙化的作用仍然不完全理解.
- 基蛋白是已知的乙化氨酸残留物的"读者".
研究的目的:
- 确定p53的新型蛋白相互作用体,其结合取决于CTD乙化状态.
- 阐明瘤蛋白SET调节p53活动的机制.
- 描述乙化依赖相互作用在p53介导的瘤抑制中的作用.
主要方法:
- 蛋白质学选以确定p53相互作用的蛋白质.
- 生物化学测试以评估蛋白质与蛋白质的相互作用和转录活性.
- 使用老鼠异种移植和敲入模型的体内研究.
主要成果:
- 瘤蛋白SET被确定为一种主要的p53相互作用蛋白,其结合由p53CTD乙化调节.
- 在未受压力的细胞中,SET抑制了p53的转录活性,但在压力诱导的p53CTD乙化后,这种抑制被取消了.
- 失去SET- p53相互作用会激活p53,从而导致体内瘤回归.
- SET 的酸性域作为未乙化p53 CTD 的"读取器",这种机制与基域读取器不同.
结论:
- 含有酸域的蛋白质,如SET,作为一种新型的乙化依赖调节剂.
- 乙化p53CTD调节其与SET和其他含有酸域的调节剂 (例如VPRBP,DAXX,PELP1) 的相互作用.
- 这种依赖乙化的调节机制在p53功能和瘤抑制中起着重要作用.
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