重新布线两个组件信号传导系统的特异性
Jeffrey M Skerker1, Barrett S Perchuk, Albert Siryaporn
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Cell
|June 17, 2008
概括
细菌使用两部分信号系统来感知它们的环境. 分析氨基酸共同进化揭示了关键残留物,当突变时,可以切换histidine激酶的特异性,使途径重新连接.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 双组件信号传导系统 (TCS) 对于细菌的环境感知和响应至关重要.
- 这些由丁激酶 (HKs) 和响应调节器 (RRs) 组成的系统需要特定的相互作用来防止信号交叉通话.
- 细菌利用众多相似的TCS,需要精确的HK-RR识别机制.
研究的目的:
- 识别细菌双组分信号通路中规范特异性的分子决定因素.
- 调查氨基酸共进化的作用在决定HK-RR相互作用特异性的作用.
- 通过有针对性的突变,证明合理改变TCS特异性的可行性.
主要方法:
- 对同类HK-RR对的大型多重序列对齐的分析,以检测氨基酸共同进化的模式.
- 在EnvZ基因酶内发现的共同演变残留物的位点定向突变发生.
- 评估突变对EnvZ基质特异性和HK-RR相互作用的影响.
主要成果:
- 在HK-RR对中确定了氨基酸共进化的特定模式,这些模式与信号特异性相关.
- 证明,在EnvZ中对同进化残留物的子集发生突变足以完全改变其基质特异性.
- 展示了通过向基因修饰来切换EnvZ激酶的目标的能力.
结论:
- 氨基酸共进化分析是发现蛋白质-蛋白质相互作用特异性的决定因素的强大工具.
- 鉴定到的同进化残留物对于在双组件信号中进行分子分辨至关重要.
- 这项工作为合理重新连接细菌信号通路和潜在的其他蛋白质-蛋白质相互作用系统提供了可通用的方法.
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