Recruitment of functionally distinct membrane proteins to chromatin mediates nuclear envelope formation in vivo.

Recruitment of functionally distinct membrane proteins to chromatin mediates nuclear envelope formation in vivo.
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DOI:
10.1083/jcb.200901106
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发表时间:
2009-07-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hetzer MW
Hetzer MW
中科院分区:
其他
文献类型:
--
作者:
Anderson DJ;Vargas JD;Hsiao JP;Hetzer MW

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在分离的染色体周围形成核膜(NE)是通过内质网(ER)的重塑来实现的,内质网是有丝分裂过程中分解的核膜成分的储存库。在这项研究中,我们发现内核膜蛋白,如层蛋白B受体(LBR)、MAN1、LAP2β,以及跨膜核孔蛋白NDc1和POM121,通过协同结合染色质的能力,推动ER膜向新生的NE扩散。尽管它们的功能是多余的,但通过RNAi介导的敲除降低这些跨膜蛋白中的任何一个的水平都会延迟NE的形成,而增加它们中的任何一个的水平都会产生相反的效果。此外,NE形成的加速干扰了有丝分裂过程中的染色体分离,这表明染色质形成膜的时间框架在生理上是相关的,并且是受调节的。这些数据表明,在有丝分裂结束时,处于非饱和水平的染色质相互作用的膜蛋白在功能上的不同类别相互协作,迅速重建核间室。
Formation of the nuclear envelope (NE) around segregated chromosomes occurs by the reshaping of the endoplasmic reticulum (ER), a reservoir for disassembled nuclear membrane components during mitosis. In this study, we show that inner nuclear membrane proteins such as lamin B receptor (LBR), MAN1, Lap2β, and the trans-membrane nucleoporins Ndc1 and POM121 drive the spreading of ER membranes into the emerging NE via their capacity to bind chromatin in a collaborative manner. Despite their redundant functions, decreasing the levels of any of these trans-membrane proteins by RNAi-mediated knockdown delayed NE formation, whereas increasing the levels of any of them had the opposite effect. Furthermore, acceleration of NE formation interferes with chromosome separation during mitosis, indicating that the time frame over which chromatin becomes membrane enclosed is physiologically relevant and regulated. These data suggest that functionally distinct classes of chromatin-interacting membrane proteins, which are present at nonsaturating levels, collaborate to rapidly reestablish the nuclear compartment at the end of mitosis.
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