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Hmo1 Is Required for TOR-Dependent Regulation of Ribosomal Protein Gene Transcription

机译:Hmo1是核糖体蛋白基因转录的TOR依赖性调节所必需的。

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Ribosome biogenesis requires equimolar amounts of four rRNAs and all 79 ribosomal proteins (RP). Coordinated regulation of rRNA and RP synthesis by eukaryotic RNA polymerases (Pol) I, III, and II is a key requirement for growth control. Using a novel global genetic approach, we showed that the absence of Hmo1 becomes lethal when combined with mutations of components of either the RNA Pol II or Pol I transcription machineries, of specific RP, or of the TOR pathway. Hmo1 directly interacts with both the region transcribed by Pol I and a subset of RP gene promoters. Down-regulation of Hmo1 expression affects RP gene expression. Upon TORC1 inhibition, Hmo1 dissociates from ribosomal DNA (rDNA) and some RP gene promoters simultaneously. Finally, in the absence of Hmo1, TOR-dependent repression of RP genes is alleviated. Therefore, we show here that Saccharomyces cerevisiae Hmo1 is directly involved in coordinating rDNA transcription by Pol I and RP gene expression by Pol II under the control of the TOR pathway.
机译:核糖体的生物发生需要等摩尔量的四个rRNA和所有79个核糖体蛋白(RP)。真核RNA聚合酶(Pol)I,III和II对rRNA和RP合成的协调调节是生长控制的关键要求。使用一种新颖的全球遗传方法,我们发现当Hmo1的缺失与RNA Pol II或Pol I转录机制,特定RP或TOR途径的成分突变结合时,会致死。 Hmo1直接与Pol I转录的区域和RP基因启动子的一部分相互作用。 Hmo1表达的下调影响RP基因表达。在TORC1抑制后,Hmo1同时从核糖体DNA(rDNA)和一些RP基因启动子上解离。最后,在没有Hmo1的情况下,RP基因的TOR依赖性抑制得以缓解。因此,我们在这里表明,酿酒酵母 Hmo1在TOR途径的控制下直接参与通过Pol I协调rDNA转录和通过Pol II协调RP基因表达。

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