рибофлавин激酶对TNF受体1与NADPH氧化酶进行配对
Benjamin Yazdanpanah1, Katja Wiegmann, Vladimir Tchikov
1Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Cologne, Germany.
Nature
|July 31, 2009
概括
riboflavin 激酶 (RFK) 作为连接瘤亡因子受体 1 (TNFR1) 与细胞防御中的关键酶 NADPH 氧化酶的桥梁. 这种相互作用对于TNF诱导的活性氧物种 (ROS) 生产至关重要,因为它通过增强FAD的纳入NADPH氧化酶而产生活性氧物种 (ROS).
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
背景情况:
- 反应性氧物种 (ROS) 是先天免疫和细胞反应中的重要信号分子.
- 激活NADPH氧化酶需要组装细胞质子单元,转位和组件集成.
- 瘤亡因子 (TNF) 刺激ROS的产生,但其对NADPH氧化酶的精确分子激活途径尚不清楚.
研究的目的:
- 确定参与TNF介导的NADPH氧化酶激活的新型蛋白质.
- 阐明将TNF受体1 (TNFR1) 与NADPH氧化酶联系起来的分子机制.
- 调查 рибофлавин激酶 (RFK) 在ROS生产中的作用.
主要方法:
- 同免疫沉测试检测蛋白质与蛋白质相互作用.
- 细胞测定测量ROS产生的反应TNF和其他刺激.
- 使用RFK缺乏细胞和外源性黄素辅因子的功能研究.
主要成果:
- riboflavin 激酶 (RFK) 被确定为一种 TNFR1 结合蛋白,该蛋白在物理上将 TNFR1 与 p22 (((phox) 联系起来,这是 NADPH 氧化酶的子单元.
- 通过RFK介导的桥接对于TNF诱导的ROS产生至关重要,但不是托尔类受体诱导的ROS产生.
- 提供外源性黄胺二核酸 (FAD) 挽救了RFK缺乏细胞中的NADPH氧化酶活性,表明RFK在FAD合成中的速度限制作用.
结论:
- RFK作为TNFR1和NADPH氧化酶之间的关键分子桥梁.
- 由TNF诱导的ROS产生取决于RFK介导的FAD纳入NADPH氧化酶.
- 通过其在FAD代谢中的作用,RFK是NADPH氧化酶组合和激活的关键调节者.
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