Reshaping of the endoplasmic reticulum limits the rate for nuclear envelope formation.

Reshaping of the endoplasmic reticulum limits the rate for nuclear envelope formation.
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重塑内质网限制了核包膜形成的速率。

DOI:
10.1083/jcb.200805140
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发表时间:
2008-09-08
影响因子:
7.8
通讯作者:
Hetzer, Martin W.
Hetzer, Martin W.
中科院分区:
生物学1区
文献类型:
--
作者:
Anderson, Daniel J.;Hetzer, Martin W.

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在后生动物的有丝分裂过程中,分离的染色体被核膜(NE)所包围,核膜是一种与内质网(ER)连续的双层膜。最近的体外数据表明,NE的形成发生的染色质介导的重组的管状ER,然而,这样的膜重塑过程的基本原则仍然是未知的。在这里,我们提出了一个定量分析的核膜组装在哺乳动物细胞使用延时显微镜。从最初招聘的内质网小管染色质,形成一个膜封闭的,运输能力的核发生在12 - 12分钟内。过表达的内质网小管形成蛋白reticulon 3,reticulon 4,和DP 1抑制NE的形成和核扩张,而他们的击倒加速核组装。这表明从膜小管到片层的转变是核组装的速率限制。我们的研究结果提供的证据表明,ER-成形蛋白直接参与核室的重建和ER的形态重建是NE形成的主要机制在体内。
During mitosis in metazoans, segregated chromosomes become enclosed by the nuclear envelope (NE), a double membrane that is continuous with the endoplasmic reticulum (ER). Recent in vitro data suggest that NE formation occurs by chromatin-mediated reorganization of the tubular ER; however, the basic principles of such a membrane-reshaping process remain uncharacterized. Here, we present a quantitative analysis of nuclear membrane assembly in mammalian cells using time-lapse microscopy. From the initial recruitment of ER tubules to chromatin, the formation of a membrane-enclosed, transport-competent nucleus occurs within ∼12 min. Overexpression of the ER tubule-forming proteins reticulon 3, reticulon 4, and DP1 inhibits NE formation and nuclear expansion, whereas their knockdown accelerates nuclear assembly. This suggests that the transition from membrane tubules to sheets is rate-limiting for nuclear assembly. Our results provide evidence that ER-shaping proteins are directly involved in the reconstruction of the nuclear compartment and that morphological restructuring of the ER is the principal mechanism of NE formation in vivo.
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影响因子: 7.8
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