有针对性的素化使得p53能够结合非正规位点
Alexandra Indeglia1, Andrea Valdespino2, Giulia Pantella3
1Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA; Graduate Group in Biochemistry and Molecular Biophysics, the University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA.
Molecular cell
|October 3, 2025
概括
基氨酸脱胺酶4 (PADI4) 酶使p53蛋白成为氨酸,改变其DNA结合. 这种修改将p53重定向到新的目标基因,影响细胞对压力的反应.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 瘤抑制蛋白p53 (TP53) 调节基因表达,以应对细胞压力.
- 控制p53的促进体选择性的确切机制尚不清楚.
- 基氨酸脱胺酶4 (PADI4) 通过素化参与蛋白质的修饰.
研究的目的:
- 研究PADI4在调节p53序列特定DNA结合中的作用.
- 通过PADI4.4识别p53氨基酸的特定部位.
- 为了确定PADI4介导的素化如何影响p53的转录标.
主要方法:
- 通过PADI4.4进行体外酶定试验来评估p53素化.
- 细胞和组织分析以确认素化部位 (R306,R363).
- 染色体免疫沉测序 (ChIP-seq) 用于绘制p53结合部位的地图.
- 在染色体分析中使用素化特异性p53抗体.
主要成果:
- PADI4在C终端直接化p53,特别是在R306和R363.
- PADI4表达将p53绑定从正规站点重定向.
- p53被重定向到与ETS转录因子相关的向基因.
- 素特异性抗体证实了改变的p53结合特征.
结论:
- 通过PADI4进行的Citrullination是p53.3的新型调节机制.
- PADI4指导p53的促进子选择性,影响其转录输出.
- 这项研究将蛋白质素化与p53瘤抑制路径的调节联系起来.
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