在辅酶核受体中存在的内在障碍和构造性共存
Sigurd Ramans-Harborough1, Arnout P Kalverda2, Iain W Manfield2
1School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.
概括
该研究表明,对于植物激素信号传递至关重要的本质上有障碍的auxin/indole 3-乙酸 (Aux/IAA) 蛋白质采用了特定的形状. 这些构造使与TIR1/AFB受体相互作用,进步了我们对辅酶信号传导的理解.
科学领域:
- 分子生物学分子生物学
- 植物科学 植物科学
- 结构生物学 结构生物学
背景情况:
- 辅酶/英多尔3-酸 (Aux/IAA) 抑制剂和TIR1/AFB蛋白质形成辅酶共受体.
- 由于预测的内在障碍,Aux/IAA蛋白的结构研究具有挑战性.
- 了解Aux/IAA结构是对auxin感知和信号传导的关键.
研究的目的:
- 在结构上描述Aux/IAA蛋白 IAA17/AXR3.3.的N端域.
- 为了研究形状灵活性在辅酶核受体复合体形成中的作用.
- 阐明涉及Aux/IAA蛋白的辅酶信号传导机制.
主要方法:
- 核磁共振 (NMR) 光谱学.核磁共振 (NMR) 光谱学.
- 循环二元化 (CD) 光谱学.循环二元化 (CD) 光谱学.
- 分子动力学 (MD) 模拟.
- 对Aux/IAA N-终端域和PB1域的建模.
主要成果:
- 在Aux/IAA降解子中的一个关键的W-P键存在于cis和trans同位素的高比例中,有利于cis对受体复合体的形成.
- AXR3的N端半部分存在于具有两个主导子群的短暂结构构造的混合物中.
- 在辅素存在时,AXR3的两个构造状态都与TIR1受体接触,这与NMR数据一致.
结论:
- 这项研究提供了Aux/IAA蛋白质的第一个完整模拟,揭示了其结构动态.
- 辅助/IAA蛋白的内在障碍在辅助信号传导中起着功能性作用.
- 这些发现为研究Aux/IAA家族变异及其在信号传递中的作用提供了一个框架.
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