佩尔多 (PELDOR) 光谱学揭示了对新氨基素敏感的核糖开关三级结构的预组织
Ivan Krstić1, Olga Frolow, Deniz Sezer
1Institute of Physical and Theoretical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt am Main, Germany.
Journal of the American Chemical Society
|January 19, 2010
概括
适应菌素的核糖开关具有稳定的结构,可以在没有显著的全球重新排列的情况下结合菌素. 这种预先安排的三级结构是连接体识别的关键,正如脉冲电子双共振 (PELDOR) 谱学所示.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- рибо开关是调节基因表达以应对小分子代谢物的RNA分子.
- 响应氨酸的核糖开关是理解RNA-配体相互作用和开发新疗法的重要目标.
- 了解在连接体结合时的 рибо开关的结构动态对于阐明它们的作用机制至关重要.
研究的目的:
- 为了研究一种工程化菌素响应性 рибо开关的三级结构和构造动力学.
- 要确定neomycin结合是否会在核糖突变中诱导显著的全球结构重组.
- 探索可用于连接体结合的RNA结构的预先安排性质.
主要方法:
- 脉冲电子双共振 (PELDOR) 光谱法被用来测量线圈开关上的自旋标签之间的距离.
- 用于在特定的核酸位置引入旋转标签的方法是局部定向的旋转标签.
- 收集了neomycin缺席和存在的数据,以评估形状变化.
主要成果:
- 佩尔多测量结果显示,在U4-U14,U4-U15,U14-U26和U15-U26位置上的旋转标签之间的特定距离.
- 这些测量的距离在neomycin结合后保持不变.
- 保持了杆开关的全球干循环架构,表明没有重大全球重新排列.
结论:
- 适应胺素的核糖开关具有预先安排的三级结构,在胺素结合后保持.
- 这种RNA存在于一个对体有利的构成组中,可以在没有显著的全球结构变化的情况下结合连接体.
- 这些发现支持一种模型,在这种模型中,连接体结合发生在没有对 рибо交换机整体结构的重大改变的情况下.
相关概念视频
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There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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