在ATP结合性ACC1-13K8中,拥挤诱导的液体-液体相分离导致了明显的氨基酸变体
Robert Dec1, Wojciech Dzwolak2, Roland Winter1
1Physical Chemistry I - Biophysical Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn Street 4a, 44227 Dortmund, Germany.
Biomacromolecules
|January 27, 2026
概括
像聚乙烯糖醇 (PEG) 一样,宏分子拥挤可以诱导中的液体液相分离 (LLPS),促进粉样纤维的形成. 不同的拥挤剂会影响蛋白质聚合通路和由此产生的粉样蛋白结构.
科学领域:
- 生物化学 生物化学
- 生物物理学的生物物理.
- 细胞生物学 细胞生物学
背景情况:
- 液-液相分离 (LLPS) 对细胞组织至关重要,并与蛋白质错折疾病有关.
- 液态固态聚合物可以在液态固态转换 (LSPT) 之前形成粉样聚合物.
- 化学性ACC1-13Kn可以作为研究结合LLPS/LSPT的模型.
研究的目的:
- 调查宏分子拥挤如何影响ATP触发的ACC1-13K8的聚合途径.
- 了解聚乙烯甘醇 (PEG) 在诱导LLPS和随后的纤维细胞形成中的作用.
- 为了比较不同拥挤剂对蛋白质聚合的影响.
主要方法:
- 利用仿制性ACC1-13K8和ATP来建模结合的LLPS/LSPT.
- 引入了各种宏分子拥挤剂:聚乙烯糖醇 (PEG),德克斯,Ficoll和血清白蛋白.
- 分析了拥挤对LLPS的影响,纤维细胞形成动力学和纤维细胞特征 (红外线,形态,稳定性).
主要成果:
- 缩的PEG诱导了LLPS和随后的纤维细胞形成,与较短的不同.
- PEG的作用与德克斯/菲科尔 (没有LLPS的加速聚合) 和血清白蛋白 (延长核化) 相比.
- 由PEG诱导的拥挤导致了明显的ACC1-13K8-ATP纤维,其特性和稳定性发生了变化.
- 在PEG拥挤条件下的纤维化率受到扩散和形状动态的限制.
结论:
- 大分子拥挤可以在动力学和热力学偏好的粉样蛋白多态体之间进行选择.
- 聚合剂的化学性质对于调节蛋白质聚合至关重要.
- 这些发现提供了对LLPS依赖的蛋白质错折和粉样蛋白形成机制的见解.
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