J-域蛋白质与Hsp90形成二元复合体,与Hsp90和Hsp70形成三元复合体
Anushka C Wickramaratne1, Jui-Yun Liao1, Shannon M Doyle1
1Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Journal of molecular biology
|June 22, 2023
概括
J-域蛋白稳定了分子伴侣相互作用. 这项研究发现,J域蛋白与Hsp90和Hsp70形成三元复合体,促进蛋白质重塑和细胞恢复.
科学领域:
- 分子生物学分子生物学
- 蛋白质生物化学 蛋白质生物化学
- 细胞应激反应的应激反应
背景情况:
- 热冲击蛋白 (Hsp90和Hsp70) 对于维持蛋白质静止和细胞恢复至关重要.
- Hsp90和Hsp70在蛋白质重塑和激活中进行协作.
- 众所周知,J-域蛋白稳定了Hsp90-Hsp70相互作用.
研究的目的:
- 研究J域蛋白在调解Hsp90和Hsp70.0之间的协作中的作用.
- 测试J域蛋白与Hsp90和Hsp70.0同时相互作用的假设.
主要方法:
- 利用了细菌和酵母系统,使用纯化的Hsp90,Hsp70 (DnaK) 和J域蛋白 (CbpA,DnaJ,Ydj1).
- 采用生物化学分析来检测和表征三元复合体形成.
- 研究了伴侣蛋白和J域蛋白之间的特定相互作用接口.
主要成果:
- 一个包含大肠杆菌Hsp90,DnaK和CbpA的三元复合体被成功检测出来.
- 相互作用涉及特定的域:CbpA的J域,大肠杆菌Hsp90的中间域和DnaK的J域结合区域.
- 大肠杆菌Hsp90及其J域蛋白 (DnaJ,CbpA) 和酵母Hsp90 (Hsp82) 与Ydj1.1之间确定的相互作用.
结论:
- J-域蛋白通过形成稳定的三元复合体,积极参与Hsp90-Hsp70协作.
- 这些复合体代表了伴侣介导的蛋白质重塑途径中的潜在的短暂中间体.
- 这些发现进一步深入了解了蛋白质平衡的陪伴合作机制.
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