在最小的宏分子系统中,凝结相之间的拉战
Archishman Ghosh1, Xiaojia Zhang1, Huan-Xiang Zhou1,2
1Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States.
Journal of the American Chemical Society
|April 25, 2020
概括
研究人员使用了四个宏分子来建模无膜有机体,揭示了它们复杂的阶段行为规则,如滴滴形成和进化. 这种极小的系统有助于理解异常相位过渡和凝结物脱混合.
科学领域:
- 生物物理
- 分子生物学
- 软物质物理学
背景情况:
- 无膜细胞是通过液态相分离形成的动态细胞区.
- 它们的形成和特性取决于众多宏分子成分之间的复杂相互作用.
- 了解控制这些相位行为的基本物理化学规则至关重要.
研究的目的:
- 通过使用四个宏分子的最小系统来研究无膜有机体的相位行为.
- 揭示压缩物形成,演化和相变的基本物理化学原理.
- 为了证明复杂的行为,如解混和属性变化可以重建和解释.
主要方法:
- 使用了四种不同的宏分子:SH35 (S),PRM5 (P),肝素 (H) 和溶酶 (L).
- 分析二进制和四进制混合物以观察相位行为 (液滴,网络沉).
- 使用的技术包括ThT结合,共聚焦显微镜和光漂白后的光回收.
主要成果:
- 观察到不同的相位行为,包括滴滴形成 (S:P,S:L,P:H) 和网络降水 (H:L).
- 建立了一种对式吸引强度的顺序 (H:L > P:H > S:P > S:L),解释相位边界.
- 证明增加P或S+P会溶解H:L沉物,而沉物会随着时间的推移演变成类似液滴的结构.
结论:
- 一个最小的四大分子系统可以重复复杂的无膜有机体阶段行为.
- 控制宏分子相互作用的物理化学规则决定了相分离和材料特性.
- 该模型提供了一个框架,用于理解和潜在地控制细胞中的异常相位转换和凝结力学.
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