DNAJB6突变体通过与Hsp70伴侣的不受管制的相互作用来表现出有毒的功能增长
Meital Abayev-Avraham1, Yehuda Salzberg2, Dar Gliksberg1
1Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot, 761000, Israel.
Nature communications
|November 4, 2023
概括
DNAJB6中的突变通过破坏Hsp70的伴侣相互作用,导致蛋白质稳定性损失,导致LGMDD1. 针对这种DNAJB6-Hsp70结合的治疗策略显示出治疗这种肌肉衰竭的前景.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 像DNAJB6这样的分子伴侣对于蛋白质折叠和防止聚合至关重要.
- DNAJB6中的突变与肢体带肌肉缩1D型 (LGMDD1) 相关,这是一种主导性自体变异性疾病.
- 在DNAJB6突变引起的功能障碍背后的精确分子机制尚不清楚.
研究的目的:
- 研究LGMDD1相关DNAJB6突变的结构和功能后果.
- 阐明DNAJB6突变导致肌纤维细胞退化的分子机制.
- 探索针对DNAJB6-Hsp70相互作用的潜在治疗干预措施.
主要方法:
- 溶液核磁共振 (NMR) 光谱法用于确定蛋白质结构.
- 生物化学测试以评估蛋白质功能和伴侣活动.
- 野生类型 (WT) 和突变DNAJB6蛋白质的体外研究.
主要成果:
- 与WT DNAJB6.6相比,DNAJB6的LGMDD1突变体表现出改变的结构.
- 疾病突变并没有显示出减少的体外聚合预防活性.
- 突变破坏了DNAJB6和Hsp70伴侣之间的调节相互作用.
- 突变体对Hsp70的过度激活导致Hsp70的枯竭和蛋白质稳定性破坏.
结论:
- LGMDD1的致病性涉及破坏DNAJB6-Hsp70的陪伴者调节,而不是受损的聚合预防.
- 过度激活和耗尽Hsp70有助于疾病表型.
- 调节DNAJB6-Hsp70结合为LGMDD提供了一个潜在的治疗策略1.1.
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