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首页> 外文期刊>Cell cycle >gammaH2A is a component of yeast heterochromatin required for telomere elongation.
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gammaH2A is a component of yeast heterochromatin required for telomere elongation.

机译:gammaH2A是端粒延长所需的酵母异染色质的组分。

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Histones of heterochromatin are deacetylated in yeast and methylated in more complex eukaryotes to regulate heterochromatin structure and gene silencing. Here, we report that histone H2A phosphorylated at serine 129 (gammaH2A) in Saccharomyces cerevisiae is a conceptually new type of heterochromatin modification that functions downstream of silent chromatin assembly. We show that gammaH2A is enriched throughout yeast telomeric and silent mating locus (HM) heterochromatin where gammaH2A results from the action of kinases Tel1 and Mec1. Interestingly, mutation of gammaH2A has no apparent effect on the binding of Sir (silent information regulator) complex or on gene silencing. In contrast, deletion of SIR3 abolishes the formation of gammaH2A at heterochromatin. To address the function of gammaH2A, we used a Deltarif1 mutant strain in which telomeres are excessively elongated to show that gammaH2A is required for the optimal recruitment of Cdc13, a regulator of telomere elongation, and for telomere elongation itself. Thus, a histone modification that parallels Sir3 protein binding is shown here to be dispensable for the formation of a silent structure but is important for a crucial heterochromatin-specific downstream function in telomere homeostasis.
机译:异染色质的组蛋白在酵母中脱乙酰,在更复杂的真核生物中甲基化,以调节异染色质的结构和基因沉默。在这里,我们报告在酿酒酵母中在丝氨酸129(gammaH2A)处磷酸化的组蛋白H2A是概念上新型的异染色质修饰,其在沉默染色质装配的下游起作用。我们显示,gammaH2A富集了整个酵母端粒和沉默交配基因座(HM)异染色质,其中gammaH2A来自激酶Tel1和Mec1的作用。有趣的是,gammaH2A的突变对Sir(沉默信息调节剂)复合物的结合或基因沉默没有明显影响。相反,SIR3的缺失消除了异染色质上γH2A的形成。为了解决gammaH2A的功能,我们使用了一个Deltarif1突变株,其中端粒过分伸长,表明gammaH2A是Cdc13(端粒伸长调节剂)和端粒伸长本身的最佳募集所必需的。因此,此处显示与Sir3蛋白结合平行的组蛋白修饰对于形成沉默结构是必不可少的,但对于端粒稳态中至关重要的异染色质特异性下游功能至关重要。

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