STI1 域参与过渡螺旋体,以调解 Dsk2 阶段分离和蛋白质体凝结
Nirbhik Acharya1,2, Emily A Daniel3, Thuy P Dao1,2
1Department of Biology, Syracuse University, Syracuse, NY, 13244, USA.
The EMBO journal
|February 11, 2026
概括
酵母Dsk2通过其STI1域与内部螺旋相互作用,形成应力凝结物. 破坏这些相互作用可以防止凝结物形成,揭示了细胞蛋白质质量控制的关键机制.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 像酵母Dsk2这样的乌比基结合的穿蛋白对于形成压力诱导的生物分子凝结物至关重要.
- 在细胞应激过程中,DSK2通过与蛋白质体和无素基质的相互作用来促进蛋白质体含缩物.
研究的目的:
- 确定Dsk2自我结合和相分离的分子驱动因素.
- 阐明STI1域和本质上无序区域在Dsk2凝结物形成中的作用.
主要方法:
- 核磁共振 (NMR) 谱学用于研究蛋白质相互作用.
- 计算模拟来模拟Dsk2的结构和动态.
- 在体外和体内实验,以评估各种条件下的凝结物形成.
主要成果:
- 陪伴结合的STI1域被确定为Dsk2自我关联和相位分离的主要驱动因素.
- Dsk2的STI1域与其内在无序区域中的三个短暂的两螺旋相互作用.
- 通过移除 STI1 域或螺旋来破坏 STI1-螺旋相互作用,可以显著减少 Dsk2 凝结物的形成.
- 在体内实验证实,扰乱这些相互作用会抑制压力诱导的Dsk2/蛋白酶体凝聚物形成.
结论:
- STI1-螺旋相互作用对于Dsk2在压力下形成生物分子凝聚物的能力至关重要.
- 这种机制突出了冷凝物形成的新型自我调节模式.
- 这些发现表明,在蛋白质质量控制途径中,STI1-螺旋相互作用可以被STI1-客户端相互作用所取代的模型.
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