一种WD域蛋白质,与II型TGF-β受体相关并由该受体酸化
R H Chen1, P J Miettinen, E M Maruoka
1Department of Growth and Development, University of California at San Francisco 94143-0640, USA.
Nature
|October 12, 1995
概括
研究人员发现了TRIP-1,一种与II型转化生长因子-β (TGF-β) 受体结合的蛋白质. 这种对TGF-β信号传递至关重要的相互作用在真核生物中保存,表明它具有基本的生物学作用.
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 生物化学 生物化学
背景情况:
- 转化生长因子-β (TGF-β) 是细胞功能的关键调节剂.
- TGF-β信号传递涉及I型和II型氨酸/氨酸激酶受体,形成一个复合体.
- 与TGF-β受体相互作用的细胞内成分以前是未知的.
研究的目的:
- 识别与TGF-β受体结合的细胞质蛋白.
- 研究新型蛋白质在TGF-β信号传导中的作用.
- 为了探索TGF-β信号元件的进化保存.
主要方法:
- 通过与TGF-βII型受体的关联来识别蛋白质.
- 激酶测试以确定受体依赖相互作用.
- 在发育过程中的同表达研究.
- 在不同物种中对TRIP-1同类的比较分析.
主要成果:
- 确定了一种含有WD域的蛋白质,TRIP-1.
- 特别地,TRIP-1以酶依赖的方式与TGF-βII型受体结合.
- TRIP-1 与异构体TGF-β受体复合体相互作用,但与活性素或I型受体不相互作用.
- TRIP-1是由受体激酶酸化,表明其作为潜在信号标的作用.
- 在发育过程中,TRIP-1和II型受体表现出共同表达.
- 在酵母和植物中存在TRIP-1的同类物,这表明功能保留.
结论:
- TRIP-1 是TGF-β信号通路的一个新组成部分.
- TRIP-1与TGF-β受体复合物的相互作用及其酸化表明TRIP-1在信号传导中的作用.
- TRIP-1的保存性表明它在真核生物学的基本作用.
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