ESCRT-III controls nuclear envelope reformation.

ESCRT-III controls nuclear envelope reformation.
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DOI:
10.1038/nature14503
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发表时间:
2015-06-11
期刊:
影响因子:
64.8
通讯作者:
Carlton, Jeremy G.
Carlton, Jeremy G.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Olmos, Yolanda;Hodgson, Lorna;Mantell, Judith;Verkade, Paul;Carlton, Jeremy G.

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在末期,核膜 (NE) 在子核周围重新形成,以确保核和细胞质内容物的正确分离。 NE 重组需要通过源自内质网的膜涂覆染色质,以及随后的环形融合步骤以确保形成的包膜被密封。环状融合是如何完成的尚不清楚,但据认为它涉及 p97 AAA-ATP 酶复合物,并且与胞质分裂脱落阶段发生的膜融合事件具有拓扑等效性。我们在这里发现运输-III 所需的内体分选复合物 (ESCRT-III) 机器定位于形成 NE 中的环形融合位点,并且对于正确的有丝分裂后核质区室化是必需的。 ESCRT-III 组分带电多泡体蛋白 (CHMP) 2A 通过与 CHMP4B 结合定向形成 NE,并提供 NE 重组所必需的活性。本地化还需要 p97 复合体成员泛素融合和降解 1 (UFD1)。我们的结果描述了 ESCRT 机器在细胞分裂中的新作用,并证明了参与拓扑等效有丝分裂膜重塑事件的机器的保守性。
During telophase, the nuclear envelope (NE) reforms around daughter nuclei to ensure proper segregation of nuclear and cytoplasmic contents. NE reformation requires the coating of chromatin by membrane derived from the Endoplasmic Reticulum and a subsequent annular fusion step to ensure the formed envelope is sealed. How annular fusion is accomplished is unknown, but it is thought to involve the p97 AAA-ATPase complex and bears a topological equivalence to the membrane fusion event that occurs during the abscission phase of cytokinesis. We find here that the Endosomal Sorting Complex Required for Transport-III (ESCRT-III) machinery localises to sites of annular fusion in the forming NE and is necessary for proper post-mitotic nucleo-cytoplasmic compartmentalisation. The ESCRT-III component Charged Multivesicular Body Protein (CHMP) 2A is directed to the forming NE through binding to CHMP4B and provides an activity essential for NE reformation. Localisation also requires the p97 complex member Ubiquitin Fusion and Degradation 1 (UFD1). Our results describe a novel role for the ESCRT-machinery in cell division and demonstrate a conservation of the machineries involved in topologically equivalent mitotic membrane remodeling events.
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