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在绕过非编码区域时将mRNA结构重新排列与核糖体运动
Jin Chen1, Arthur Coakley2, Michelle O'Connor2
1Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305-5126, USA; Department of Applied Physics, Stanford University, Stanford, CA 94305-4090, USA.
Cell
|November 23, 2015
概括
研究人员发现核糖体如何跳过大量的菌体T4mRNA. 这种核糖体绕过涉及暂停,旋转状态和mRNA结构变化,从而实现高效的翻译.
科学领域:
- 分子生物学
- 生物化学
- 遗传学
背景情况:
- 菌体T4mRNA转换涉及60基因中的50核酸 (nt) 绕道事件.
- 这种大规模的核糖体的机制和调节尚不清楚.
研究的目的:
- 阐明T4mRNA转换过程中的核糖体绕过的机制和构造细节.
- 确定控制绕过核糖体选择的因素.
主要方法:
- 使用零模式波导的单分子光显微镜.
- 在T4基因60mRNA转换过程中跟踪单个大肠杆菌核糖体.
主要成果:
- 绕过的核糖体在非正规的旋转状态下在起飞中呈现10到20倍的暂停.
- 与新生相互作用相结合的mRNA二次结构重组,通过解脱抗-相互作用来促进核糖体滑动.
- 在到达着陆地点后, 核糖体扫描最佳的基因配对相互作用.
结论:
- 在绕过过程中,非正规的核糖体状态对于mRNA重新折叠和大规模核糖体运动至关重要.
- 新生的相互作用和mRNA二次结构动态驱动核糖体的重新定位.
- 这为理解特定的大规模核糖体转移事件提供了机制框架.
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