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通过使用固态NMR (SSNMR) 和分子动态 (MD) 模拟,研究不同动态pHP1α状态的KCl介导液态-液态相分离 (LLPS)

Sze Yuet Chin¹, Yinglu Chen², Lei Zhao²

¹Centre of High Field NMR Spectroscopy and Imaging, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore.

The journal of physical chemistry. B

|October 10, 2024

概括

使用修改的固态NMR研究了染色体相位分离的动态. 增加的盐度 (KCl) 增强了分相分离的蛋白质系统中的分子运动.

科学领域:

生物化学生物化学
分子生物学分子生物学
生物物理学的生物物理.

背景情况:

染色体相位分离对于基因组活动至关重要,并由各种因素调节.
在体外和体内观察到染色质和蛋白质的液态相分离 (LLPS),但机制尚不清楚.
阶段分离复合物的物理化学性质很难研究.

研究的目的:

为了研究化异性染色蛋白1α (pHP1α) 分相系统的动态和物理化学特性.
阐明分子运动和盐度在调节色氨酸相位分离中的作用.

主要方法:

利用修改的固态NMR (SSNMR) 脉冲序列,包括异核Overhauser效应 (hetNOE),以检测动态组件.
采用NMR技术,选择性地激发和研究来自蛋白质凝内的不同状态的信号.
综合分子动力学 (MD) 模拟与实验性NMR数据.

主要成果:

在pHP1α分相系统中检测到动态,粘性和中间成分.
在低KCl度 (30毫米) 中观察到减少的分子运动.
在高KCl度 (150毫米) 中发现分子运动增加,归因于静电相互作用.

结论:

修改后的SSNMR,特别是hetNOE,可以直接了解相隔系统的分子动力学.
在pHP1α相分离过程中,KCl度显著影响分子运动.
由KCl调节的分子间静电相互作用在调节染色质相分离的动态方面发挥着关键作用.

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