离子在mRNA元素的监管环境中减轻了变态稳定状态
Erdong Ding1,2, Susmit Narayan Chaudhury3, Jigneshkumar Dahyabhai Prajapati3
1Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, USA.
概括
2'-脱氧氨酸 (2'-dG) рибо开关需要 2'-dG 连接体和离子 (Mg2+) 进行稳定. 这些分子独特地重塑RNA.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 丝带切换器是调节性RNA元素.
- 2 - 脱氧氨酸 (2 - dG) рибо开关通过改变其在联体结合时的结构来控制基因表达.
- RNA结构受到金属离子的显著影响,特别是Mg2+.
研究的目的:
- 为了研究2 -dG连接体和Mg2+对2 -dG рибо交换机体域的联合作用.
- 阐明连接体和Mg2+在稳定 рибо开关结构中的不同作用.
- 了解这些因素对能源格局的调制.
主要方法:
- 用明确溶剂进行全原子分子动力学模拟 (99微秒总样采集).
- 选择性2 - 酸乙化,通过原料延伸 (SHAPE) 实验进行分析.
- 对RNA构造变化和能量格局的定量分析.
主要成果:
- 2 -dG和Mg2+都对亚胺域稳定至关重要.
- 2+通过建立新的联系来重塑能源格局,减少挫折感.
- 2 -dG结合核化一个紧的核心,消除了元稳定状态.
- 通过这两个因素稳定P1螺旋和 рибо开关核心 (P2和P3螺旋).
- 2+和2 -dG促进了更紧的三向结结构.
结论:
- 连接物和Mg2+结合作用通过不同的机制来稳定2 -dG рибо开关胺体.
- 2+减少了充满活力的景观挫折,而2 -dG促进了核心形成.
- 这些结合的效应对于 рибо开关的调节功能至关重要.
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