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单分子对RNA结合蛋白占用率的量化和静电测量定义了Yira1 (Aly/REF) 在核mRNP组织中的作用
Ryuta Asada1, Andrew Dominguez2, Ben Montpetit2
1Department of Viticulture and Enology, University of California, Davis, Davis, CA 95616, USA.
Cell reports
|November 14, 2023
概括
这项研究研究了酵母中的信使核糖蛋白 (mRNP) 颗粒,揭示了动态的RNA结合蛋白 (RBP) 组成. 关键的RBP如Yara1,Nab2和Npl3显示可变的拷贝数,影响基因表达调节.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 使者核糖蛋白 (mRNP) 颗粒是RNA结合蛋白 (RBPs) 和mRNA的动态复合体.
- 这些mRNP调节基因表达,但它们的组成和功能尚未完全理解.
- 了解mRNP的组成对于破译基因表达控制至关重要.
研究的目的:
- 调查单个mRNP中的RBP的固体测量和共同占用情况.
- 探索mRNP的动态性质和组成异质性.
- 确定特定RBPs在mRNP包装和基因表达中的功能作用.
主要方法:
- 开发一种基于光的单分子成像测定方法.
- 在Saccharomyces cerevisiae mRNP中对15个RBPs进行定量分析.
- 在不同的生长条件下评估mRNP组成.
主要成果:
- 单个mRNP表现出不同的组成和可塑性,这取决于生长条件.
- Yra1,Nab2和Npl3是核封锁结合复合体含有mRNP的主要共同占用者,其副本数量可变.
- 多拷贝Yara1结合的mRNP与THO复合体结合,并且在具有特定长度和结构偏差的mRNA上发现.
- 它的耗尽导致mRNP紧缩的减少,表明包装的作用.
结论:
- 已经建立了一个定量框架,用于分析个别mRNP中的RBP占用率和石化计.
- mRNP的组成取决于基因和条件,强调了监管灵活性.
- 它在核mRNP包装中发挥着重要作用.
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