The differential interaction of snRNPs with pre-mRNA reveals splicing kinetics in living cells.

The differential interaction of snRNPs with pre-mRNA reveals splicing kinetics in living cells.
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DOI:
10.1083/jcb.201004030
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发表时间:
2010-10-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Stanek D
Stanek D
中科院分区:
其他
文献类型:
--
作者:
Huranová M;Ivani I;Benda A;Poser I;Brody Y;Hof M;Shav-Tal Y;Neugebauer KM;Stanek D

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GFP 标记的 snRNP 成分揭示了体内剪接体组装的动态和速率。前体信使 RNA (pre-mRNA) 剪接由剪接体催化,剪接体是一种由五个小核 RNP 颗粒 (snRNP) 和其他蛋白质组成的大型核糖核蛋白 (RNP) 复合物。利用内源水平表达的 GFP 标记的 snRNP 成分的活细胞成像,我们检查了剪接体如何在体内组装。对细胞核中 snRNP 动力学的全面分析使我们能够确定 snRNP 在整个核质中的扩散以及单个 snRNP 与前 mRNA 的相互作用率。剪接体的核心成分U2和U5 snRNP与前mRNA结合15-30秒,表明剪接在这段时间内完成。此外,U1 和 U4/U6 snRNP 与前 mRNA 的结合在几秒钟内发生,表明各个 snRNP 与前 mRNA 的相互作用是不同的。这些结果与剪接体组装的逐步模型的预测一致,并提供了对人类细胞剪接速率的估计。
GFP-tagged snRNP components reveal the dynamics and rate for spliceosome assembly in vivo. Precursor messenger RNA (pre-mRNA) splicing is catalyzed by the spliceosome, a large ribonucleoprotein (RNP) complex composed of five small nuclear RNP particles (snRNPs) and additional proteins. Using live cell imaging of GFP-tagged snRNP components expressed at endogenous levels, we examined how the spliceosome assembles in vivo. A comprehensive analysis of snRNP dynamics in the cell nucleus enabled us to determine snRNP diffusion throughout the nucleoplasm as well as the interaction rates of individual snRNPs with pre-mRNA. Core components of the spliceosome, U2 and U5 snRNPs, associated with pre-mRNA for 15–30 s, indicating that splicing is accomplished within this time period. Additionally, binding of U1 and U4/U6 snRNPs with pre-mRNA occurred within seconds, indicating that the interaction of individual snRNPs with pre-mRNA is distinct. These results are consistent with the predictions of the step-wise model of spliceosome assembly and provide an estimate on the rate of splicing in human cells.
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