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首页> 外文期刊>Molecular biology of the cell >Loss of Ubp3 increases silencing, decreases unequal recombination in rDNA, and shortens the replicative life span in Saccharomyces cerevisiae
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Loss of Ubp3 increases silencing, decreases unequal recombination in rDNA, and shortens the replicative life span in Saccharomyces cerevisiae

机译:Ubp3的丢失增加沉默,减少rDNA中不均等的重组,并缩短酿酒酵母中的复制寿命

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Ubp3 is a conserved ubiquitin protease that acts as an antisilencing factor in MAT and telomeric regions. Here we show that ubp3? mutants also display increased silencing in ribosomal DNA (rDNA). Consistent with this, RNA polymerase II occupancy is lower in cells lacking Ubp3 than in wild-type cells in all heterochromatic regions. Moreover, in a ubp3? mutant, unequal recombination in rDNA is highly suppressed. We present genetic evidence that this effect on rDNA recombination, but not silencing, is entirely dependent on the silencing factor Sir2. Further, ubp3? sir2? mutants age prematurely at the same rate as sir2? mutants. Thus our data suggest that recombination negatively influences replicative life span more so than silencing. However, in ubp3? mutants, recombination is not a prerequisite for aging, since cells lacking Ubp3 have a shorter life span than isogenic wild-type cells. We discuss the data in view of different models on how silencing and unequal recombination affect replicative life span and the role of Ubp3 in these processes.
机译:Ubp3是一种保守的泛素蛋白酶,可在MAT和端粒区域充当抗沉默因子。这里我们显示ubp3?突变体还显示出核糖体DNA(rDNA)沉默的增加。与此相一致,在所有异色区域中,缺乏Ubp3的细胞中RNA聚合酶II的占有率要低于野生型细胞。而且,在ubp3中?突变体,rDNA中的不均等重组受到高度抑制。我们目前的遗传证据表明,这种对rDNA重组的影响(而不是沉默)完全取决于沉默因子Sir2。此外,ubp3?先生2突变体以与sir2相同的速率过早衰老?突变体。因此,我们的数据表明重组比复制沉默对复制寿命的负面影响更大。但是,在ubp3中?突变,重组不是衰老的前提,因为缺乏Ubp3的细胞的寿命比同基因野生型细胞的寿命短。我们讨论关于沉默和不平等重组如何影响复制寿命和Ubp3在这些过程中的作用的不同模型的数据。

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