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通过耗尽相互作用分离的液态-液态相液滴的接口加速粉样纤维的形成

Keiichi Yamaguchi^1,2, Joji Mima^1,2, Kichitaro Nakajima^1,2

¹Graduate School of Engineering, Osaka University, Osaka, Japan.

Protein science : a publication of the Protein Society

|January 29, 2025

概括

像聚乙烯糖醇 (PEG) 和德克斯 (DEX) 这样的宏分子 crowders 加快了α-synuclein (αSN) 粉样蛋白的形成. 这个过程是由相隔PEG和DEX滴的接口上的αSN凝结驱动的.

科学领域:

生物化学生物化学
生物物理学的生物物理.
神经科学是一个神经科学.

背景情况:

粉样纤维的α-synuclein (αSN) 的形成是synucleinopathies的核心.
在体内,αSN自我组装成粉样纤维的机制尚未完全理解.

研究的目的:

为了研究宏分子聚合物对αSN粉样蛋白形成的影响.
阐明分相和界面效应在蛋白质聚合中的作用.

主要方法:

使用聚乙烯甘醇 (PEG) 和德克斯 (DEX) 作为宏分子聚合剂.
使用光显微镜观察到αSN粉样蛋白形成.
应用了超声波以进一步探测氨基基基因.
测试了粉样蛋白β,β2-微球蛋白和蛋白色酶.

主要成果:

PEG和DEX显著加快了αSN粉样蛋白的形成,每种峰值为7% (w/v).
群体诱导相位分离,在PEG阶段的DEX滴的接口集中粉样蛋白形成.
超声波证实了滴滴依赖的粉样蛋白形成.
观察到粉样β的加速聚合,但对折叠蛋白质 (β2-微型球蛋白,酶) 抑制.

结论:

阶段分离的crowder系统中的耗尽相互作用在滴滴界面驱动αSN凝结,加速粉样蛋白的形成.
crowders 对粉样蛋白生成的影响取决于蛋白质的折叠或不折叠状态.
研究结果提供了有关神经退行性疾病的体内蛋白质聚合机制的见解.

关键词:

液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴液滴大分子分子拥挤.过度和是一种超和.α-Synuclein 是一种蛋白质.这是一种β2-微型球体蛋白.

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