与ALS相关的E425K突变将DNAJC7从Hsp70伴侣循环中脱离
Bar Elmaleh1, Ofrah Faust1, Rina Rosenzweig1
1Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot, Israel.
The FEBS journal
|January 14, 2026
概括
肌缩性侧面硬化症 (ALS) 与DNAJC7突变有关. 这项研究揭示了E425K突变如何破坏DNAJC7与Hsp70的相互作用,损害蛋白质平衡,并为ALS提供机械基础.
科学领域:
- 分子生物学分子生物学
- 神经科学是一个神经科学.
- 生物化学 生化学
背景情况:
- DNAJC7 (J-域蛋白) 对于蛋白质平衡和Hsp70调节至关重要.
- DNAJC7中的突变与肌缩性侧面硬化症 (ALS) 有关,但潜在的机制尚不清楚.
- DNAJC7 具有用于 Hsp70 激活的 J 域和用于蛋白相互作用的 TPR 域.
研究的目的:
- 研究与ALS相关的E425K突变在DNAJC7的J域中的结构和功能影响.
- 阐明DNAJC7的TPR域在Hsp70相互作用和客户端蛋白调节中的作用.
- 了解ALS中DNAJC7功能障碍的机械基础.
主要方法:
- 核磁共振 (NMR) 谱学用于评估蛋白质结构和相互作用.
- 生物化学测试以评估Hsp70激活和客户端蛋白结合.
- 在野生型和突变DNAJC7.7.存在的情况下对TDP-43聚合和重新折叠的分析.
主要成果:
- E425K突变不会改变DNAJC7结构,而是通过J域破坏其与Hsp70的主要相互作用.
- 一个涉及DNAJC7的TPR域和HSP70的EEVD动机的二次Hsp70结合部位被确定,并且在突变者中保持完整.
- 虽然突变者保留了对TDP-43聚合的保持酶活性,但它未能促进Hsp70介导的客户端转移和重新折叠.
结论:
- DNAJC7的功能依赖于其J域和TPR域的协调作用,以有效调节Hsp70.
- 由E425K突变破坏J域介导的Hsp70激活,使DNAJC7与Hsp70机器脱.
- 这项研究为ALS中DNAJC7功能障碍提供了一种机制性的解释,强调了精确的陪伴者相互作用的重要性.
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