Anomalous Dense Liquid Condensates Host the Nucleation of Tumor Suppressor p53 Fibrils

Anomalous Dense Liquid Condensates Host the Nucleation of Tumor Suppressor p53 Fibrils
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异常致密液体凝结物承载肿瘤抑制因子 p53 原纤维的成核

DOI:
10.1016/j.isci.2019.01.027
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发表时间:
2019
期刊:
影响因子:
5.8
通讯作者:
Vekilov, Peter G.
Vekilov, Peter G.
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Safari, Mohammad S.;Wang, Zhiqing;Tailor, Kunaal;Kolomeisky, Anatoly B.;Conrad, Jacinta C.;Vekilov, Peter G.

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大约一半的人类癌症与肿瘤抑制基因p53的突变有关。突变体获得的致癌功能与野生型和突变型p53的聚集行为有关。p53聚集的热力学和动力学机制知之甚少。在这里,我们发现野生型p53形成一个异常的液相。液态凝聚体表现出一些超出经典相变理论范围的行为:它们的尺寸,约。100 nm,与p53浓度无关,与液相中的蛋白质质量无关。此外,液相缺乏恒定的溶解度。p53纤维的成核偏离了公认的单一溶质分子顺序缔合的机制。我们发现,液体冷凝物作为预组装前体的高p53浓度,促进原纤维组装。由前体主持的原纤维成核代表了一种新的生物学途径,这为抑制聚集性疾病中的蛋白质原纤维化开辟了途径。
About half of human cancers are associated with mutations of the tumor suppressor p53. Gained oncogenic functions of the mutants have been related to aggregation behaviors of wild-type and mutant p53. The thermodynamic and kinetic mechanisms of p53 aggregation are poorly understood. Here we find that wild-type p53 forms an anomalous liquid phase. The liquid condensates exhibit several behaviors beyond the scope of classical phase transition theories: their size, ca. 100 nm, is independent of the p53 concentration and decoupled from the protein mass held in the liquid phase. Furthermore, the liquid phase lacks constant solubility. The nucleation of p53 fibrils deviates from the accepted mechanism of sequential association of single solute molecules. We find that the liquid condensates serve as pre-assembled precursors of high p53 concentration that facilitate fibril assembly. Fibril nucleation hosted by precursors represents a novel biological pathway, which opens avenues to suppress protein fibrillation in aggregation diseases.
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