Functional genomics identifies a Myb domain-containing protein family required for assembly of CENP-A chromatin.

Functional genomics identifies a Myb domain-containing protein family required for assembly of CENP-A chromatin.
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DOI:
10.1083/jcb.200701065
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发表时间:
2007-03-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Desai A
Desai A
中科院分区:
其他
文献类型:
--
作者:
Maddox PS;Hyndman F;Monen J;Oegema K;Desai A

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含有着丝粒特异性组蛋白H3变体着丝粒蛋白A(CENP - A)的核小体为动粒组装创造了染色质基础。为了理解将CENP - A选择性靶向着丝粒的机制,我们在线虫秀丽隐杆线虫中采用了一种功能基因组学方法,在线虫中,CENP - A加载失败会导致一种标志性的动粒缺失(KNL)表型。我们鉴定出一种单一的蛋白质KNL - 2,它是CENP - A整合到染色质中所特需的。KNL - 2和CENP - A在整个细胞周期中以相互依赖的方式定位于着丝粒,并协同指导染色体浓缩、动粒组装和染色体分离。对与KNL - 2相关的染色质的分离显示其与CENP - A共同富集,表明它们在DNA上紧密相邻。KNL - 2定义了一个新的含Myb DNA结合结构域的保守蛋白家族。KNL - 2的人类同源物对于CENP - A加载和动粒组装也是特需的,但在有丝分裂退出后仅短暂存在于着丝粒。这些结果表明一个新的蛋白质类别参与着丝粒染色质的组装,并提示全着丝粒和单着丝粒染色体在CENP - A加载方面共享一种共同机制。
Nucleosomes containing the centromere-specific histone H3 variant centromere protein A (CENP-A) create the chromatin foundation for kinetochore assembly. To understand the mechanisms that selectively target CENP-A to centromeres, we took a functional genomics approach in the nematode Caenorhabditis elegans, in which failure to load CENP-A results in a signature kinetochore-null (KNL) phenotype. We identified a single protein, KNL-2, that is specifically required for CENP-A incorporation into chromatin. KNL-2 and CENP-A localize to centromeres throughout the cell cycle in an interdependent manner and coordinately direct chromosome condensation, kinetochore assembly, and chromosome segregation. The isolation of KNL-2–associated chromatin coenriched CENP-A, indicating their close proximity on DNA. KNL-2 defines a new conserved family of Myb DNA-binding domain–containing proteins. The human homologue of KNL-2 is also specifically required for CENP-A loading and kinetochore assembly but is only transiently present at centromeres after mitotic exit. These results implicate a new protein class in the assembly of centromeric chromatin and suggest that holocentric and monocentric chromosomes share a common mechanism for CENP-A loading.
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