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短距离吸引和远距离排斥之间的相互作用 控制核蛋白-RNA复合体的回流液体凝结
Ibraheem Alshareedah1, Taranpreet Kaur1, Jason Ngo1
1Department of Physics , University at Buffalo , Buffalo , New York 14260 , United States.
Journal of the American Chemical Society
|August 23, 2019
概括
由于RNA-RNP比率,细胞核蛋白 (RNP) 凝结体表现出重新进入的液体凝结 (RLC). 分子相互作用,包括-π吸引力和静电力,控制这些组件的RLC和材料状态.
科学领域:
- 分子生物学
- 生物物理
- 细胞生物学
背景情况:
- 细胞利用通过液-液相分离形成的核糖蛋白 (RNP) 凝聚物进行动态亚细胞分离.
- 许多RNP凝结物的形成和溶解对RNA与RNP的比率很敏感,导致一种称为回流液体凝结 (RLC) 的现象.
研究的目的:
- 在RLC中观察到的非单调相位过渡背后的分子驱动力.
- 阐明短距离的吸引力和长距离的静电力如何控制RNP-RNA复合物的行为.
主要方法:
- 使用具有低复杂性RNA结合序列的核糖蛋白启发的多.
- 使用原型无序RNP,融入瘤 (FUS) 作为模型系统.
- 分析不同长度尺度上的分子相互作用.
主要成果:
- 证明了短距离的-π吸引力和长距离的静电力之间的相互作用在RNP-RNA复合体中决定了RLC.
- 由初级和基础序列影响的短距离吸引力调节了凝结物质的特性,并抵抗了溶解.
- 在多余的RNA中观察到类似合体的集群阶段的形成,过渡到具有增加近距离吸引力的合体凝.
结论:
- RNP-RNA组合阶段的行为,组织和物质状态由多个长度尺度的分子相互作用的平衡控制.
- 短距离的吸引力和长距离的静电力是RLC和过渡到凝状态的关键决定因素.
- 了解这些分子相互作用提供了对子细胞分离的调节的见解.
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