Coexisting Liquid Phases Underlie Nucleolar Subcompartments.

Coexisting Liquid Phases Underlie Nucleolar Subcompartments.
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DOI:
10.1016/j.cell.2016.04.047
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发表时间:
2016-06-16
期刊:
影响因子:
64.5
通讯作者:
Brangwynne CP
Brangwynne CP
中科院分区:
生物学1区
文献类型:
--
作者:
Feric M;Vaidya N;Harmon TS;Mitrea DM;Zhu L;Richardson TM;Kriwacki RW;Pappu RV;Brangwynne CP

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核仁和其他核糖核蛋白(RNP)体是无膜的细胞器,它们似乎是通过分子组分的相分离组装的。然而,许多这样的RNP机构包含内部的子隔间,其形成的机制仍然不清楚。在这里,我们结合联合收割机在体内和体外的研究,连同计算建模,以表明,子车厢内的核仁代表不同的,共存的液相。与它们在体内的不可分离性一致,纯化的核仁蛋白相分离成含有明显类似于体内核仁的不同非聚结相的液滴。这种分层的液滴组织是由相的生物物理性质的差异引起的-特别是液滴表面张力-这是由它们的大分子组分的序列编码特征引起的。这些结果表明,相分离可以产生多层液体,可以促进各种RNP机构中的顺序RNA加工反应。
The nucleolus and other ribonucleoprotein (RNP) bodies are membrane-less organelles that appear to assemble through phase separation of their molecular components. However, many such RNP bodies contain internal sub-compartments, and the mechanism of their formation remains unclear. Here, we combine in vivo and in vitro studies, together with computational modeling, to show that sub-compartments within the nucleolus represent distinct, coexisting liquid phases. Consistent with their in vivo immiscibility, purified nucleolar proteins phase separate into droplets containing distinct non-coalescing phases that are remarkably similar to nucleoli in vivo. This layered droplet organization is caused by differences in the biophysical properties of the phases – particularly droplet surface tension – which arises from sequence-encoded features of their macromolecular components. These results suggest that phase separation can give rise to multilayered liquids that may facilitate sequential RNA processing reactions in a variety of RNP bodies.
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