整蛋白LFA-1与转录协激活剂JAB1相互作用,以调节AP-1活动
E Bianchi1, S Denti, A Granata
1Scientific Institute San Raffaele-DIBIT, Milano, Italy. bianchi.elisabetta@hsr.it
Nature
|April 15, 2000
概括
集成蛋白LFA-1信号调节基因表达,通过控制c-Jun联合激活剂Jun激活域结合蛋白1 (JAB1) 的核定位来调节基因表达. 这种相互作用会影响转录因子的活性,影响细胞功能.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 整合素粘附受体调解细胞信号传递,这对基因表达至关重要.
- 整合素的细胞内域缺乏催化活性,需要与其他分子相互作用.
- 阿尔法L/β2整合素LFA-1在免疫细胞粘附和信号传递中起着关键作用.
研究的目的:
- 确定与LFA-1β2亚单元的细胞质域相互作用的蛋白质.
- 研究这种相互作用对基因表达的功能后果.
- 阐明一个新的途径,以整合因介导的转录调节.
主要方法:
- 蛋白相互作用研究以确定与LFA-1结合的JAB1.
- 细胞局部化研究 (共聚焦显微镜) 来追踪JAB1和LFA-1.
- 在LFA-1参与后对AP-1DNA结合和交换活化试验的分析.
主要成果:
- 关节激活域结合蛋白1 (JAB1) 被确定为LFA-1β2亚单元的交互因子.
- JAB1定位在细胞质和细胞核,其中一部分与细胞膜上的LFA-1共定位.
- LFA-1的参与增加了核JAB1,增强了c-Jun/AP-1的DNA结合,并增强了依赖AP-1的促进子活动.
结论:
- 集成蛋白LFA-1信号调节c-Jun驱动的转录通过调节JAB1核定位.
- 这确定了对基因表达的整合因依赖控制的新机制.
- 这些发现直接将整合素信号与参与细胞功能的关键转录因子的调节联系起来.
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