对大肠杆菌Hsp70,DnaK及其核酸交换因子GrpE之间的复合物的结构和功能的新见解
Maria-Agustina Rossi1, Alexandra K Pozhidaeva1, Eugenia M Clerico1
1Department of Biochemistry & Molecular Biology, University of Massachusetts Amherst, Amherst, Massachusetts, USA.
The Journal of biological chemistry
|December 18, 2023
概括
像GrpE这样的核酸交换因子 (NEF) 通过结合其核酸结合域来调节热冲击蛋白70 (Hsp70) 的功能. 这项研究揭示了DnaK NBD/GrpE复合物的新模型,表明GrpE触发了全信号.
科学领域:
- 分子生物学分子生物学
- 蛋白质动力学 蛋白质动力学
- 生物化学 生物化学
背景情况:
- 热冲击蛋白 (Hsp70s) 对于细胞功能至关重要,它们依赖于它们的核酸结合域 (NBD) 和基质结合域之间的全沟通.
- 核酸交换因子 (NEFs) 通过促进ADP释放和ATP结合来调节Hsp70全质周期.
研究的目的:
- 通过先进的建模和实验验证,对大肠杆菌Hsp70 DnaK NBD/GrpE复合体进行结构性重新检查.
- 阐明由GrpE与DnaK结合引起的形状变化和全信号传递.
主要方法:
- 通过AlphaFold建模,生成DnaK NBD/GrpE复合体的新结构模型.
- 基于溶液的方法来验证蛋白质构成,并通过突变发生学来评估功能影响.
主要成果:
- 产生了DnaK NBD/GrpE复合物的新型模型,其中包括一个旋转的NBD亚域IIB和一个开放的核酸结合裂.
- 这种新模型与在GrpE结合时增加ADP折扣率的实验观测相一致.
- 有证据表明,GrpE结合会在DnaK内发起一个域间的全信号.
结论:
- 该研究提供了对Hsp70-NEF相互作用的精细结构理解,突出了结构动态的作用.
- 这些发现阐明了像GrpE这样的NEF通过全调节调节Hsp70活性的机制.
- 这项工作进一步拓展了我们对Hsp70陪伴函数及其NEFs调节的知识.
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