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Rpb4p, a subunit of RNA polymerase II, mediates mRNA export during stress

机译:Rpb4p,RNA聚合酶II的一个亚基,在压力下介导mRNA的输出

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Changes in gene expression represent a major mechanism by which cells respond to stress. We and other investigators have previously shown that the yeast RNA polymerase II subunit Rpb4p is required for transcription under various stress conditions, but not under optimal growth conditions. Here we show that, in addition to its role in transcription, Rpb4p is also required for mRNA export, but only when cells are exposed to stress conditions. The roles of Rpb4p in transcription and in mRNA export can be uncoupled genetically by specific mutations in Rpb4p. Both functions of Rpb4p are required to maintain cell viability during stress. We propose that Rpb4p participates in the cellular responses to stress at the interface of the transcription and the export machineries. [References: 42]
机译:基因表达的变化代表细胞对压力作出反应的主要机制。我们和其他研究人员先前已经表明,酵母RNA聚合酶II亚基Rpb4p在各种胁迫条件下(而不是在最佳生长条件下)转录都是必需的。在这里我们显示,除了其在转录中的作用外,Rpb4p对于mRNA的输出也是必需的,但仅当细胞暴露于应激条件下时才如此。 Rpb4p在转录和mRNA输出中的作用可以通过Rpb4p中的特定突变在遗传上解耦。 Rpb4p的两种功能都需要在压力下维持细胞活力。我们建议Rpb4p参与细胞反应,以减轻转录和输出机器的界面处的压力。 [参考:42]

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