首页> 外文期刊>Journal of Molecular Biology >Acetylation and accessibility of rDNA chromatin in Saccharomyces cerevisiae in (Delta)top1 and (Delta)sir2 mutants.
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Acetylation and accessibility of rDNA chromatin in Saccharomyces cerevisiae in (Delta)top1 and (Delta)sir2 mutants.

机译:rDNA染色质在(Δ)top1和(Δ)sir2突变体中的乙酰化和可及性。

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摘要

The insertion of reporter genes in the ribosomal DNA (rDNA) locus of Saccharomyces cerevisiae causes their transcriptional repression. This kind of transcriptional silencing depends on proteins such as Sir2p and Top1p, and has been shown to be mediated by chromatin. While Sir2p modifies nucleosomes directly through its histone deacetylase activity, little is known about changes in the chromatin structure that occur at the rDNA locus when TOP1 is deleted. Here, we show that the absence of Top1p causes increased histone acetylation at the rDNA locus. Moreover, rDNA chromatin becomes more accessible in a similar manner in both top1 and sir2 mutant strains.
机译:在酿酒酵母的核糖体DNA(rDNA)基因座中插入报告基因会导致其转录抑制。这种转录沉默取决于诸如Sir2p和Top1p之类的蛋白质,并且已经证明是由染色质介导的。虽然Sir2p直接通过其组蛋白脱乙酰基酶活性修饰核小体,但对于删除TOP1时在rDNA位点发生的染色质结构变化知之甚少。在这里,我们显示了Top1p的缺失会导致rDNA基因座处的组蛋白乙酰化增加。此外,rDNA染色质在top1和sir2突变株中都以相似的方式更容易获得。

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