Cse4 is part of an octameric nucleosome in budding yeast.

Cse4 is part of an octameric nucleosome in budding yeast.
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DOI:
10.1016/j.molcel.2009.07.022
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发表时间:
2009-09-24
期刊:
影响因子:
16
通讯作者:
Gerton, Jennifer L.
Gerton, Jennifer L.
中科院分区:
生物学1区
文献类型:
--
作者:
Camahort, Raymond;Shivaraju, Manjunatha;Mattingly, Mark;Li, Bing;Nakanishi, Shima;Zhu, Dongxiao;Shilatifard, Ali;Workman, Jerry L.;Gerton, Jennifer L.

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出芽酵母的着丝粒组蛋白H3变体Cse4定位于着丝粒核小体,对动粒组装和染色体分离是必需的。含Cse4的着丝粒核小体的确切组成是一个有争议的话题。染色质免疫沉淀 - 芯片(ChIP - chip)实验和高分辨率定量PCR证实每个着丝粒处有一个Cse4核小体,并且基因组的其他区域含有低水平的Cse4核小体。我们使用无偏向的生化、细胞生物学和遗传学方法检测了含Cse4核小体的组成。利用微球菌核酸酶处理的染色质,我们发现Cse4与组蛋白H2A、H2B和H4相关联,但与H3或非组蛋白Scm3无关。Cse4的过表达可挽救scm3缺失的致死性,这表明Scm3对于功能性着丝粒染色质的形成不是必需的。此外,八聚体的Cse4核小体可在体外重组。Cse4 - Cse4相互作用结构域似乎是必需的,并且这种相互作用在体内的着丝粒核小体中发生。综上所述,我们的实验证据支持Cse4 - 核小体是一个八聚体的模型,其中包含两个Cse4、两个H2A、两个H2B和两个H4。
The budding yeast CenH3 histone variant Cse4 localizes to centromeric nucleosomes and is required for kinetochore assembly and chromosome segregation. The exact composition of centromeric Cse4–containing nucleosomes is a subject of debate. ChIP-chip experiments and high resolution quantitative PCR confirm that there is a single Cse4 nucleosome at each centromere, and additional regions of the genome contain Cse4 nucleosomes at low levels. Using unbiased biochemical, cell biological, and genetic approaches we have tested the composition of Cse4-containing nucleosomes. Using micrococcal nuclease-treated chromatin, we find that Cse4 is associated with the histones H2A, H2B, and H4, but not H3 or the non-histone protein Scm3. Overexpression of Cse4 rescues the lethality of a scm3 deletion, indicating Scm3 is not essential for the formation of functional centromeric chromatin. Additionally, octameric Cse4 nucleosomes can be reconstituted in vitro. The Cse4-Cse4 interaction domain appears to be essential and interaction occurs in vivo in the centromeric nucleosome. Taken together, our experimental evidence supports the model that the Cse4-nucleosome is an octamer, containing two copies each of Cse4, H2A, H2B, and H4.
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