DNA Local-Flexibility-Dependent Assembly of Phase-Separated Liquid Droplets.

DNA Local-Flexibility-Dependent Assembly of Phase-Separated Liquid Droplets.
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DOI:
10.1016/j.bpj.2018.09.022
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发表时间:
2018-11-20
影响因子:
3.4
通讯作者:
King JT
King JT
中科院分区:
生物学3区
文献类型:
--
作者:
Shakya A;King JT

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细胞内组分的相分离最近已被认识为细胞实现无膜组织的机制。在这里,我们研究了缔合液-液相分离(LLPS)的DNA与阳离子多肽络合后。比较不同的单链DNA以及双链DNA(dsDNA)的序列,不同的持久性长度的相位行为,我们发现,DNA的本地灵活性,而不仅仅是电荷密度,决定LLPS。此外,以核苷酸和DNA依赖性方式,游离核苷酸三磷酸促进多肽-dsDNA复合物的LLPS,否则其易于沉淀。在这些条件下,dsDNA经历二次相分离,在液滴内形成液晶亚区室。这些结果指向一个角色的本地DNA的灵活性,编码的序列,在多组分LLPS在无膜细胞内组织的调节和选择性。
Phase separation of intracellular components has been recently realized as a mechanism by which cells achieve membraneless organization. Here, we study the associative liquid-liquid phase separation (LLPS) of DNA upon complexation with cationic polypeptides. Comparing the phase behavior of different single-stranded DNA as well as double-stranded DNA (dsDNA) sequences that differ in persistence lengths, we find that DNA local flexibility, not simply charge density, determines the LLPS. Furthermore, in a nucleotide- and DNA-dependent manner, free nucleotide triphosphates promote LLPS of polypeptide-dsDNA complexes that are otherwise prone to precipitation. Under these conditions, dsDNA undergoes a secondary phase separation forming liquid-crystalline subcompartments inside the droplets. These results point toward a role of local DNA flexibility, encoded in the sequence, in the regulation and selectivity of multicomponent LLPS in membraneless intracellular organization.
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