结构知情突变发生识别了对小鼠胰岛素受体IRES功能的组合性贡献.
William B Dahl1, Tammy C T Lan2, Silvi Rouskin3
1Brandeis University.
概括
细胞使用内部核糖体进入点 (IRES) 在压力期间翻译必要的基因. 研究人员绘制了胰岛素受体mRNA的地图.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 细胞应激反应的应激反应
背景情况:
- 在压力期间,细胞抑制了卡普依赖的翻译.
- 内部核糖体进入点 (IRES) 能够在压力下翻译关键转录.
- 胰岛素受体mRNA的5'未翻译区域 (5'UTR) 显示了保留的IRES活性.
研究的目的:
- 在体外和细胞中研究Insr 5'UTR IRES的RNA二次结构.
- 为了确定Insr IRES功能的结构基础.
- 为了设计一个最小的IRES元素.
主要方法:
- 通过测序 (DMS-MaPseq) 的二甲基硫酸盐突变概况被用来探测RNA的次要结构.
- 对病毒IRES (C型肝炎病毒,脑肌心炎病毒) 和Insr 5'UTR IRES进行了结构探测.
- 用RNA结构建模和突变分析来识别功能性RNA元素.
主要成果:
- 细胞中的病毒IRES结构与体外数据一致.
- 为小鼠Insr 5'UTR IRES二次结构生成了一个模型.
- 确定了对Insr IRES功能至关重要的保存RNA段.
- 设计了一个具有全长活动的最小IRES元素.
结论:
- 这项研究阐明了细胞IRES的二次结构.
- 确定了Insr IRES介导翻译所必需的关键RNA元素.
- 为潜在的治疗应用开发了一个最小的IRES.
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