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In vivo evolution of an RNA-based transcriptional activator

机译:基于RNA的转录激活剂的体内进化

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摘要

From random RNA libraries expressed in yeast, we evolved RNA-based transcriptional activators that are comparable in potency to the strongest natural protein activation domains. The evolved RNAs activated transcription up to 53-fold higher than a three-hybrid positive control using the Gal4 activation domain and only 2-fold lower than the highly active VP16 activation domain. Using a combination of directed evolution and site-directed mutagenesis, we dissected the functional elements of the evolved transcriptional activators. A surprisingly large fraction of RNAs from our library are capable of activating transcription, suggesting that nucleic acids may be well suited for binding transcriptional machinery elements normally recruited by proteins. In addition, our work demonstrates an RNA evolution-based approach to perturbing natural cellular function that may serve as a general tool for studying selectable or screenable biological processes in living cells. [References: 32]
机译:从酵母中表达的随机RNA库中,我们进化出了基于RNA的转录激活因子,其效力与最强的天然蛋白质激活域相当。使用Gal4激活域,进化的RNA激活的转录比三杂交阳性对照高53倍,而比高度活跃的VP16激活域低2倍。使用定向进化和定点诱变的组合,我们解剖了进化的转录激活因子的功能元件。来自我们的文库的RNA中出乎意料的很大一部分能够激活转录,这表明核酸可能非常适合结合通常由蛋白质募集的转录机制元件。此外,我们的工作演示了一种基于RNA进化的扰动天然细胞功能的方法,该方法可作为研究活细胞中选择性或可筛选生物学过程的通用工具。 [参考:32]

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