The SUN protein Mps3 controls Ndc1 distribution and function on the nuclear membrane.

The SUN protein Mps3 controls Ndc1 distribution and function on the nuclear membrane.
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DOI:
10.1083/jcb.201307043
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发表时间:
2014-02-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Jaspersen SL
Jaspersen SL
中科院分区:
其他
文献类型:
--
作者:
Chen J;Smoyer CJ;Slaughter BD;Unruh JR;Jaspersen SL

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Ndc1-Mps3相互作用对于控制Ndc1在核孔复合体和纺锤体极体之间的分布以确保这两个复合体正确地插入核膜是重要的。在酿酒酵母等封闭的有丝分裂系统中,核孔复合体(NPC)和纺锤体极体(SPB)必须组装成一个完整的核膜(NE)。NDc1是一种高度保守的完整膜蛋白,参与了这两种复合体的插入。在这项研究中,我们用荧光互相关光谱证明了Ndc1与NE上含有SUN结构域的蛋白Mps3相互作用。对一系列新的Ndc1等位基因的遗传和分子分析使我们了解了Ndc1-Mps3结合在NE中的作用。我们发现Ndc1-L562S等位基因不能与Mps3特异地关联,并发现该突变是由于SPB复制缺陷而致死的。与其他Ndc1等位基因不同,Ndc1-L562S的生长和Mps3结合缺陷通过POM152的缺失而完全抑制,POM152编码NPC成分。根据我们的数据,我们认为Ndc1-Mps3相互作用对于控制Ndc1在NPC和SPB之间的分布是重要的。
Ndc1–Mps3 interaction is important for controlling the distribution of Ndc1 between the nuclear pore complex and spindle pole body to ensure proper nuclear envelope insertion of both complexes. In closed mitotic systems such as Saccharomyces cerevisiae, nuclear pore complexes (NPCs) and the spindle pole body (SPB) must assemble into an intact nuclear envelope (NE). Ndc1 is a highly conserved integral membrane protein involved in insertion of both complexes. In this study, we show that Ndc1 interacts with the SUN domain–containing protein Mps3 on the NE in live yeast cells using fluorescence cross-correlation spectroscopy. Genetic and molecular analysis of a series of new ndc1 alleles allowed us to understand the role of Ndc1–Mps3 binding at the NE. We show that the ndc1-L562S allele is unable to associate specifically with Mps3 and find that this mutant is lethal due to a defect in SPB duplication. Unlike other ndc1 alleles, the growth and Mps3 binding defect of ndc1-L562S is fully suppressed by deletion of POM152, which encodes a NPC component. Based on our data we propose that the Ndc1–Mps3 interaction is important for controlling the distribution of Ndc1 between the NPC and SPB.
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