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
中科院分区:
文献类型:
--
作者:
Shakya A;King JT
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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