The actin family protein ARP6 contributes to the structure and the function of the nucleolus.

The actin family protein ARP6 contributes to the structure and the function of the nucleolus.
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DOI:
10.1016/j.bbrc.2015.07.005
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发表时间:
2015-08-21
影响因子:
3.1
通讯作者:
Harata M
Harata M
中科院分区:
生物学4区
文献类型:
--
作者:
Kitamura H;Matsumori H;Kalendova A;Hozak P;Goldberg IG;Nakao M;Saitoh N;Harata M

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肌动蛋白家族成员包括肌动蛋白和肌动蛋白相关蛋白(ARPs),是染色质重塑复合物的重要组成部分。ARP 6是核ARP之一,是Snf-2相关CREB结合蛋白激活蛋白(SRCAP)染色质重塑复合物的一部分,其促进组蛋白变体H2A.Z沉积到染色质中。在这项研究中,我们发现ARP 6影响核仁的结构和功能。ARP 6定位于核仁的中心区域,并且其敲低诱导核仁中的形态学变化。我们还发现,在高浓度葡萄糖存在下,ARP 6通过将H2 A. Z置于染色质中而有助于维持活性核糖体DNA(rDNA)转录。相反,在饥饿条件下,ARP 6通过独立于H2A.Z的rDNA转录抑制而为细胞存活所必需。这些发现揭示了肌动蛋白家族在核组织和代谢稳态中的新的多效性作用。
The actin family members, consisting of actin and actin-related proteins (ARPs), are essential components of chromatin remodeling complexes. ARP6, one of the nuclear ARPs, is part of the Snf-2-related CREB-binding protein activator protein (SRCAP) chromatin remodeling complex, which promotes the deposition of the histone variant H2A.Z into the chromatin. In this study, we showed that ARP6 influences the structure and the function of the nucleolus. ARP6 is localized in the central region of the nucleolus, and its knockdown induced a morphological change in the nucleolus. We also found that in the presence of high concentrations of glucose ARP6 contributed to the maintenance of active ribosomal DNA (rDNA) transcription by placing H2A.Z into the chromatin. In contrast, under starvation, ARP6 was required for cell survival through the repression of rDNA transcription independently of H2A.Z. These findings reveal novel pleiotropic roles for the actin family in nuclear organization and metabolic homeostasis.
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