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Yeast DEAD Box Protein Mss116p Is a Transcription Elongation Factor That Modulates the Activity of Mitochondrial RNA Polymerase

机译:酵母DEAD盒蛋白Mss116p是一种转录延长因子,可调节线粒体RNA聚合酶的活性。

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DEAD box proteins have been widely implicated in regulation of gene expression. Here, we show that the yeast Saccharomyces cerevisiae DEAD box protein Mss116p, previously known as a mitochondrial splicing factor, also acts as a transcription factor that modulates the activity of the single-subunit mitochondrial RNA polymerase encoded by RPO41. Binding of Mss116p stabilizes paused mitochondrial RNA polymerase elongation complexes in vitro and favors the posttranslocated state of the enzyme, resulting in a lower concentration of nucleotide substrate required to escape the pause; this mechanism of action is similar to that of elongation factors that enhance the processivity of multisubunit RNA polymerases. In a yeast strain in which the RNA splicing-related functions of Mss116p are dispensable, overexpression of RPO41 or MSS116 increases cell survival from colonies that were exposed to low temperature, suggesting a role for Mss116p in enhancing the efficiency of mitochondrial transcription under stress conditions.
机译:DEAD盒蛋白已广泛参与基因表达的调控。在这里,我们显示酵母酿酒酵母DEAD盒蛋白Mss116p(以前称为线粒体剪接因子)还充当转录因子,可调节 RPO41 编码的单亚单位线粒体RNA聚合酶的活性。 。 Mss116p的结合稳定了体外暂停的线粒体RNA聚合酶延伸复合物,并促进了该酶的后转移状态,从而使逃脱暂停所需的核苷酸底物浓度降低;这种作用机制类似于增强多亚基RNA聚合酶加工性的延伸因子。在不需要Mss116p RNA剪接相关功能的酵母菌株中, RPO41 MSS116 的过表达提高了暴露于低温菌落的细胞存活率,这表明应激条件下Mss116p在增强线粒体转录效率中的作用

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