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RhoC GTPase Activation Assay
Published on: August 22, 2010
与Ha-Ras的致癌和转录合作需要对c-Jun在63和73级蛋白上进行酸化
T Smeal1, B Binetruy, D A Mercola
1Department of Pharmacology, University of California San Diego, School of Medicine, La Jolla 92093-0636.
Nature
|December 12, 1991
概括
瘤性Ha-ras信号激活AP-1复合体,通过酸化c-Jun在63和73级蛋白中进行激活. 这种酸化对于Ha-ras诱导的细胞转化和基因表达变化至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞信号传输 细胞信号传输
- 在瘤学瘤学.
背景情况:
- 瘤促进剂,转化和激活蛋白-1 (AP-1) 的活性是相关的.
- 蛋白激酶C激活和生长因子刺激AP-1的DNA结合活性.
- 由Jun和Fos蛋白组成的AP-1复合体是信号级联的核心.
研究的目的:
- 调查c-Jun作为瘤信号的目标的作用.
- 阐明Ha-ras如何影响c-Jun的活动和转变.
- 为了绘制由Ha-ras.调节的c-Jun上特定的酸化点的地图.
主要方法:
- 研究了蛋白激酶C激活及其对AP-1DNA结合的影响.
- 使用大鼠胚胎纤维细胞进行转化测试,使用c-Jun和Ha-ras.
- 采用位点定向突变发生法来识别和分析c-Jun的酸化位点.
主要成果:
- 纤维细胞的瘤转化需要功能性c-Jun转录活动.
- 致癌性Ha-ras的表达增强了c-Jun的交换活化,并刺激了其酸化.
- 在c-Jun上的酸化部位,特别是63和73,被绘制为Ha-ras-responsive.
结论:
- 哈拉斯对c-Jun在63和73级的酸化对其增强的活性至关重要.
- 这种酸化对于Ha-ras与c-Jun在瘤转化中的合作至关重要.
- c-Jun作为一个关键的调解者,将瘤信号转化为改变基因表达的转化.
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