氨基酸通过调节蛋白质-蛋白质相互作用,在体外和体内调节液体-液体相分离
Xufeng Xu1, Aleksander A Rebane2,3, Laura Roset Julia1
1Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.
概括
氨基酸 (AAs) 可以抑制细胞中的液-液相分离 (LLPS) 和应力颗粒 (SG) 的形成. 诸如林,谷氨酸和甘氨酸等特定的AAs显示出显著的抑制作用,为GS相关疾病提供了潜在的治疗策略.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 液-液相分离 (LLPS) 是一个关键的细胞内过程.
- 氨基酸 (AAs) 是拥挤的细胞环境中必不可少的组成部分.
- 亚糖会影响蛋白质相互作用,可能调节LLPS.
研究的目的:
- 为了研究蛋白质原性AA在抑制LLPS中的作用.
- 为了在体外和体内发现抑制压力颗粒 (SG) 形成的特定AA.
- 探索AAs影响SG动态和细胞过程的机制.
主要方法:
- 选所有蛋白质原性AA,以抑制LLPS.
- 在体外测试以评估AA对LLPS的影响.
- 使用U2OS,HeLa和初级纤维细胞细胞系观察SG形成的体内研究.
- 活细胞显微镜用于SG动态的动态分析.
- 沉-扩散平衡分析超离心法 (SE-AUC) 用于分析分子相互作用.
主要成果:
- 氨酸,谷氨酸和甘氨酸被确定为多种细胞类型中SG形成的强有力的抑制剂.
- 发现AA减缓了SG的形成,降低了和水平,并防止凝聚.
- SE-AUC数据表明,AA调节蛋白-蛋白和RNA-RNA相互作用,影响LLPS.
- 在初级纤维细胞中观察到的效应强调了与神经退行性疾病的相关性.
结论:
- 细胞氨基酸在调节LLPS和SG形成方面发挥着重要作用.
- 特定的AAs对应力颗粒动态表现出强大的抑制作用.
- 这些发现表明AA在治疗与异常LLPS和SG相关的疾病中的潜在生物医学应用.
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