重建的三方复合物的分析支持由基质绑定的J域蛋白对Hsp70的基于贪的招募
Marcin Jelen1, Igor Grochowina1, Aneta Grabinska-Rogala1
1Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland.
Journal of molecular biology
|September 20, 2023
概括
热冲击蛋白70 (Hsp70) 的分子伴侣功能通过研究三方复合体来澄清. 一个刚性J-域蛋白质基质复合物招募Hsp70,增强基质结合和伴侣活动.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 热冲击蛋白70 (Hsp70) 是蛋白质平衡中涉及的必不可少的分子陪伴者.
- Hsp70的功能依赖于ATP的水解,由J域蛋白 (JDP) 的cochaperones刺激.
- 由于短暂的结合事件,Hsp70-JDP与基质相互作用的精确机制仍然不完全理解.
研究的目的:
- 阐明Hsp70-JDP基质复合物形成和稳定性的机制.
- 调查JDP在招募Hsp70到基板中的作用.
- 了解三方复合体的形成如何增强Hsp70的ATPase活性和基质结合.
主要方法:
- 利用一种缺乏ATPase的Hsp70变体来分离一个稳定的Hsp70-JDP-基质三元复合体.
- 通过检查关键相互作用残留物来评估复杂的形成和稳定性.
- 采用计算对接来建模三方复杂结构和相互作用.
主要成果:
- 成功分离和表征了一种稳定的Hsp70-JDP-基质三方复合物.
- 复杂的稳定性取决于对双边相互作用至关重要的保存残留物.
- 计算建模揭示了一种刚性JDP-基质复合体,通过精确的J-域和基质定位来招募Hsp70 (ATP),从而产生高欲.
结论:
- 该JDP基质复合体作为一个刚性支架,招募Hsp70(ATP),导致增强的性和高效的基质结合.
- 这种由JDP-基质相互作用驱动的高狂热机制,可能解释了许多Hsp70系统中的协同ATPase刺激.
- 另外一个JDP-Hsp70相互作用部位被确定,这有助于在这个专门系统中观察到的高性.
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