c-Jun可以通过特定的对接相互作用来招募JNK为酸化二元化伙伴
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093-0636, USA.
Cell
|November 29, 1996
概括
了解酶 (JNK) 如何向特定的蛋白,揭示了对点和特异性残留物对于酶识别的重要性. 异体化还影响JNKs的基质酸化.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 细胞信号传递 细胞信号传递
背景情况:
- 结构上相似的血清/三联激酶在体内表现出明显的基质特异性,尽管在体外识别出类似的基因.
- 激酶 (JNKs) 是一种应激激活蛋白激酶家族,涉及各种细胞过程.
- 蛋白 (c-Jun, JunB, JunD) 是转录因子,是JNK信号的目标.
研究的目的:
- 阐明JNK对不同Jun蛋白的基质特异性背后的分子机制.
- 确定对接点的作用和JNK介导酸化中的特异性传递残留物.
- 为了研究蛋白质-蛋白质相互作用,如异构化,对酶-基质识别的影响.
主要方法:
- 在体外激酶测试测量酸化效率.
- 分析Jun蛋白序列以确定对接点和受体残留物.
- 位点定向的突变发生,以引入或去除特异性赋予残留物.
- 关于Jun蛋白质异构化的研究.
主要成果:
- JNKs有效酸化c-Jun,效率较低酸化JunD,并且没有酸化JunB.
- 一个功能性的JNK对接点和特异性传递的残留物对于高效的JNK基质识别至关重要.
- JunB拥有一个对接点,但缺乏特异性残留物,这解释了它缺乏酸化.
- 缺乏对接点的JunD,但具有c-Jun类受体,可以通过与对接能力强的合作伙伴进行异体化化.
结论:
- 激酶基质的特异性是由受体位点的识别和额外的对接相互作用决定的.
- 异体化是JNKs可以识别和化缺乏直接对接点的基质的机制.
- 这些发现提供了对信号调节蛋白激酶活性和转录因子功能的调节的见解.
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