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受体氨酸激酶信号的选择性由二次SH2域结合位控制
Jae Hyun Bae1, Erin Denise Lew, Satoru Yuzawa
1Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.
Cell
|August 12, 2009
概括
在受体氨酸激酶信号传递中,SH2域相互作用是关键. 新的研究揭示了二次结合点调节脂酶Cgamma选择性,为细胞信号通路提供了更复杂的视图.
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
- 结构生物学 结构生物学
背景情况:
- SH2域通过光氨酸 (pY) 识别通过受体氨酸激酶 (RTKs) 介导跨膜信号传递.
- SH2域与含有pY的结合亲和力很小,这表明细胞中信号通路选择性的机制过于简单.
研究的目的:
- 阐明FGFR1信号传递中脂酶Cgamma (PLCγ) 选择性的结构和机制基础.
- 为了研究二次结合相互作用在调节SH2域选择性的作用 in vivo.
主要方法:
- 激活的FGFR1激酶域的晶体结构的确定与一个PLCγ碎片复杂.
- 生物化学测试以评估结合亲和关系和信号事件.
- 使用培养细胞进行实验,以在生物环境中验证发现.
主要成果:
- 晶体结构显示了激活的FGFR1和PLCγ片段之间的复合体.
- 通过激活的FGFR1,脂酶Cgamma (PLCγ) 的结合和信号选择性由二次SH2域结合部位和FGFR1激酶域之间的相互作用来控制.
- 这些相互作用以酸化独立的方式发生.
结论:
- SH2域的选择性是由与二次结合位点的酸化独立相互作用调节的.
- 这种机制提供了更细致的理解,即SH2域选择性是如何在体内控制的,以调解特定的细胞过程.
- 这些发现挑战了在RTK信号传输中SH2域函数过于简单化的观点.
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