Dual recognition of CENP-A nucleosomes is required for centromere assembly.

Dual recognition of CENP-A nucleosomes is required for centromere assembly.
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DOI:
10.1083/jcb.201001013
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发表时间:
2010-06-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Straight AF
Straight AF
中科院分区:
其他
文献类型:
--
作者:
Carroll CW;Milks KJ;Straight AF

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CENP-C和CENP-N识别CENP-A核小体的不同结构元素,为组装其他着丝粒和着丝粒组件提供了基础。着丝粒含有特殊的核小体,其中组蛋白H3被组蛋白变体着丝粒蛋白A(CENP-A)取代。CENP-A核小体被认为是指定着丝粒身份的表观遗传标记。我们先前发现CENP-N是一种CENP-A核小体特异性结合蛋白。在这里,我们证明了CENP-C也直接和CENP-A核小体特异结合。CENP-C与核小体的结合需要CENP-A的C端,而不与CENP-N结合,这表明CENP-C和CENP-N识别CENP-A核小体的不同结构元素。在体外破坏CENP-C与CENP-A核小体结合的突变导致了针对着丝粒的CENP-C的缺陷。此外,siRNA耗尽CENP-C导致所有其他非组蛋白CENP错误定位,包括CENP-K、CENP-H、CENP-I和CENP-T,并导致着丝粒CENP-A部分减少。我们认为CENP-C直接与CENP-A染色质结合,并与CENP-N一起为其他着丝粒和动粒蛋白的组装提供了基础。
CENP-C and CENP-N recognize distinct structural elements of CENP-A nucleosomes, providing a foundation for the assembly of other centromere and kinetochore components. Centromeres contain specialized nucleosomes in which histone H3 is replaced by the histone variant centromere protein A (CENP-A). CENP-A nucleosomes are thought to act as an epigenetic mark that specifies centromere identity. We previously identified CENP-N as a CENP-A nucleosome-specific binding protein. Here, we show that CENP-C also binds directly and specifically to CENP-A nucleosomes. Nucleosome binding by CENP-C required the extreme C terminus of CENP-A and did not compete with CENP-N binding, which suggests that CENP-C and CENP-N recognize distinct structural elements of CENP-A nucleosomes. A mutation that disrupted CENP-C binding to CENP-A nucleosomes in vitro caused defects in CENP-C targeting to centromeres. Moreover, depletion of CENP-C with siRNA resulted in the mislocalization of all other nonhistone CENPs examined, including CENP-K, CENP-H, CENP-I, and CENP-T, and led to a partial reduction in centromeric CENP-A. We propose that CENP-C binds directly to CENP-A chromatin and, together with CENP-N, provides the foundation upon which other centromere and kinetochore proteins are assembled.
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影响因子: 21.3
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