CAL1 is the Drosophila CENP-A assembly factor.

CAL1 is the Drosophila CENP-A assembly factor.
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DOI:
10.1083/jcb.201305036
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发表时间:
2014-02-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Mellone BG
Mellone BG
中科院分区:
其他
文献类型:
--
作者:
Chen CC;Dechassa ML;Bettini E;Ledoux MB;Belisario C;Heun P;Luger K;Mellone BG

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CAL 1代表了一个独特的组蛋白装配因子家族,在果蝇中将组蛋白H3变体CENP-A装配到着丝粒DNA上。着丝粒通过掺入组蛋白H3变体CENP-A在表观遗传学上被指定。在人类、两栖动物和真菌中,CENP-A通过装配因子的HJURP/Scm 3家族沉积在着丝粒处,但是这些伴侣蛋白的同源物不存在于许多主要的真核谱系中,例如昆虫、鱼类、线虫和植物。在果蝇中,CENP-A的着丝粒沉积需要苍蝇特异性蛋白CAL 1。在这里,我们表明,在果蝇细胞中的非着丝粒DNA的目标CAL 1是足以遗传招募CENP-A,动粒蛋白,和微管附件。CAL 1选择性地与CENP-A相互作用,并足以组装显示与左手八聚体一致的性质的CENP-A核小体。CAL 1的CENP-A组装活性位于N-末端结构域内,而C末端通过与CENP-C的相互作用介导着丝粒识别。总的来说,这项工作确定了“失踪”的CENP-A分子伴侣在苍蝇,揭示了昆虫和脊椎动物的着丝粒规范机制之间的基本保护。
Representing a unique family of histone assembly factors, CAL1 assembles the histone H3 variant CENP-A on centromeric DNA in Drosophila. Centromeres are specified epigenetically by the incorporation of the histone H3 variant CENP-A. In humans, amphibians, and fungi, CENP-A is deposited at centromeres by the HJURP/Scm3 family of assembly factors, but homologues of these chaperones are absent from a number of major eukaryotic lineages such as insects, fish, nematodes, and plants. In Drosophila, centromeric deposition of CENP-A requires the fly-specific protein CAL1. Here, we show that targeting CAL1 to noncentromeric DNA in Drosophila cells is sufficient to heritably recruit CENP-A, kinetochore proteins, and microtubule attachments. CAL1 selectively interacts with CENP-A and is sufficient to assemble CENP-A nucleosomes that display properties consistent with left-handed octamers. The CENP-A assembly activity of CAL1 resides within an N-terminal domain, whereas the C terminus mediates centromere recognition through an interaction with CENP-C. Collectively, this work identifies the “missing” CENP-A chaperone in flies, revealing fundamental conservation between insect and vertebrate centromere-specification mechanisms.
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