The nucleoporin MEL-28 promotes RanGTP-dependent γ-tubulin recruitment and microtubule nucleation in mitotic spindle formation

The nucleoporin MEL-28 promotes RanGTP-dependent γ-tubulin recruitment and microtubule nucleation in mitotic spindle formation
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核孔蛋白 MEL-28 促进 RanGTP 依赖性 γ-微管蛋白募集和有丝分裂纺锤体形成中的微管成核

DOI:
10.1038/ncomms4270
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发表时间:
2014
影响因子:
16.6
通讯作者:
Gruss OJ
Gruss OJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yokoyama H;Koch B;Walczak R;Ciray- Duygu F;González-Sánchez JC;Devos DP;Mattaj IW;Gruss OJ

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在染色体周围产生的gtp结合形式的Ran gtp酶(RanGTP)在有丝分裂后驱动核膜和核孔复合体(NPC)重新组装。核孔蛋白MEL-28/ELYS以rangtp调控的方式结合染色质,并作为NPC组装的种子。在这里,我们表明,在有丝分裂NPC解体后,MEL-28从染色质分离并重新定位到纺锤体微管和着丝点。MEL-28通过其c端染色质结合域以rangtp调控的方式直接与微管结合。使用xenopusegg提取物,我们证明MEL-28对rangtp依赖的微管成核和纺锤体组装至关重要,独立于其在NPC组装中的功能。具体来说,MEL-28与γ-微管蛋白环复合物相互作用并将其招募到微管成核位点。我们的数据确定MEL-28是在整个细胞周期中起作用的RanGTP靶点。它与染色质或微管的细胞周期依赖性结合区分了MEL-28在间期和有丝分裂中的功能,并确保纺锤体组装仅在NPC分解后发生。
The GTP-bound form of the Ran GTPase (RanGTP), produced around chromosomes, drives nuclear envelope and nuclear pore complex (NPC) re-assembly after mitosis. The nucleoporin MEL-28/ELYS binds chromatin in a RanGTP-regulated manner and acts to seed NPC assembly. Here we show that, upon mitotic NPC disassembly, MEL-28 dissociates from chromatin and re-localizes to spindle microtubules and kinetochores. MEL-28 directly binds microtubules in a RanGTP-regulated way via its C-terminal chromatin-binding domain. UsingXenopusegg extracts, we demonstrate that MEL-28 is essential for RanGTP-dependent microtubule nucleation and spindle assembly, independent of its function in NPC assembly. Specifically, MEL-28 interacts with the γ-tubulin ring complex and recruits it to microtubule nucleation sites. Our data identify MEL-28 as a RanGTP target that functions throughout the cell cycle. Its cell cycle-dependent binding to chromatin or microtubules discriminates MEL-28 functions in interphase and mitosis, and ensures that spindle assembly occurs only after NPC breakdown.
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