反感RNA C9orf72 六核酸重复与肌缩性侧面硬化症和前性痴呆症相关,形成三重体状结构,并结合小型合成连接体
Leszek Błaszczyk1, Marcin Ryczek1, Bimolendu Das2
1Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12/14, 61-704, Poland.
Nucleic acids research
|May 13, 2024
概括
在C9orf72中六核酸重复 (HR) 的异常扩张导致ALS/FTD. 我们确定了带有和没有ANP77连接体的HRRNA的晶体结构,揭示了其三重结构和用于治疗设计的相互作用.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 神经科学是一个神经科学.
背景情况:
- 在C9orf72中GGGCC/GGCCCC六核酸重复 (HR) 的异常扩张是肌缩侧面硬化症 (ALS) 和前性痴呆症 (FTD) 的关键遗传因素.
- 艾尔斯/FTD的病理机制涉及这些重复的结构变化,导致有毒RNA物种的形成.
- 开发向疗法需要深入了解病原性HRRNA与潜在治疗分子之间的结构相互作用.
研究的目的:
- 阐明六核酸重复 (HR) RNA折叠的结构基础及其与小分子连接体的相互作用.
- 为合理设计针对C9orf72相关的ALS和FTD的新疗法提供高分辨率的结构数据.
主要方法:
- 采用X射线晶体学,确定与ANP77连接体及其自由形式复合的反意义HRRNA的高分辨率结构.
- 结构分析的重点是RNA折叠,RNA-配体相互作用和非正规基对的形成.
主要成果:
- 与ANP77复合的HRRNA的晶体结构以1.1 Å分辨率确定,揭示了由四个RNA链组成的三重结构.
- 通过类似三明治的形状,ANP77连接体形成了伪正规的基对与两个相邻的单链细胞因子.
- 未结合的HRRNA采用了独特的三重i-动机结构,由跨C•C+对和Hoogsteen边缘相互作用稳定.
结论:
- 这些结构性发现揭示了与疾病相关的HRRNA多态结构格局的新见解.
- 详细了解HRRNA-ANP77相互作用为以结构为基础的针对ALS和FTD的小分子设计提供了基础.
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