光蛋白标记促进相位分离,并改变huntingtin exon-1的聚合途径
Nitin K Pandey1, Jobin Varkey1, Anakha Ajayan1
1Physiology and Neuroscience, Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
The Journal of biological chemistry
|December 23, 2023
概括
红色光蛋白 (RFP) 标签显著改变亨廷丁exon-1 (Httex1) 阶段分离和聚合. Tagged Httex1很容易形成液体凝聚物和纤维,与未标记的蛋白质不同,影响细胞聚合研究.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 光蛋白标签被广泛用于研究蛋白质聚合和相分离.
- 这些标签对蛋白质行为的影响并不总是很好地描述.
- 亨廷丁外子-1 (Httex1) 涉及亨廷顿病,已知会聚集.
研究的目的:
- 为了研究一个C端红色光蛋白 (RFP) 标签对huntingtin exon-1 (Httex1) 的相分离的影响.
- 将RFP标记的Httex1与未标记的Httex1.1的体外和细胞内行为进行比较.
主要方法:
- 在体外相位分离试验中使用拥挤剂进行测试.
- 电子偏磁共振 (EPR) 光谱学.电子偏磁共振 (EPR) 光谱学.
- 在光漂白后的光恢复 (FRAP).
- 在细胞表达和聚合分析中.
主要成果:
- 被RFP标记的Httex1迅速形成了动态的,类似液体的相隔状态.
- 没有标记的Httex1在相同条件下没有表现出可检测的液态凝析物形成.
- RFP标签促进了液体-液体相分离和随后的液体-固体过渡到纤维,加速纤维形成.
- 在细胞中,与未标记的Httex1.1相比,RFP标记的Httex1形成了较大的聚合物,染色模式发生了变化.
结论:
- 光蛋白标签显著影响Httex1.1的液态和固态分离行为.
- 与未标记的对应物相比,Httex1在体外和细胞中表现出明显的聚合特性.
- 这些发现强调了使用未标记版本对标记蛋白质获得的结果进行验证的必要性,特别是在对Httex1错误折叠和毒性的研究中.
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