内体化物/质子交换器需要抑制性TMEM9β子单元来调节和预防引起疾病的过度活动
Rosa Planells-Cases1, Viktoriia Vorobeva1,2, Sumanta Kar1
1Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany.
Nature communications
|April 1, 2025
概括
TMEM9和TMEM9B蛋白对于内体化物/质子交换器 (CLC) 是必不可少的. 这些蛋白调节CLC的贩运,并抑制它们的离子运输,防止内体胀和疾病.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生理学 生理学 生理学
背景情况:
- 内体离子稳态,特别是化物 (Cl-) 和质子 (H+) 运输,对于细胞功能至关重要.
- 已知有五种不同的内溶性CLC化物/质子交换器,它们的功能障碍导致严重疾病.
- 目前尚不完全了解CLC载体的调节机制和辅助蛋白.
研究的目的:
- 确定内体细胞CLC-3,CLC-4和CLC-5的基本子单元.
- 阐明TMEM9和TMEM9B在CLC功能,贩运和监管中的作用.
- 为了研究TMEM9-CLC相互作用对离子运输和内体细胞平衡的影响.
主要方法:
- 对缺乏TMEM9和TMEM9B的小鼠进行生成和分析.
- 在淘汰赛小鼠中评估CLC蛋白水平和局部化.
- 在体外测试以研究TMEM9对CLC离子运输活性的影响.
主要成果:
- TMEM9和TMEM9B被确定为内体细胞CLC-3,CLC-4和CLC-5的强制性β子单元.
- 缺乏TMEM9/TMEM9B的小鼠显示严重降低了CLC水平和胚胎死亡率.
- TMEM9蛋白调节CLC贩运,并以强力抑制CLC离子运输,需要一个特定的碳基终端域.
- 与疾病相关的CLCN突变损害了TMEM9介导的抑制,导致致病性离子运输.
结论:
- TMEM9和TMEM9B是内体CLC功能的关键调节者,对于维持离子平衡至关重要.
- TMEM9对CLC活性的抑制作用对于防止有毒离子积累和内体功能障碍至关重要.
- 这项研究需要对目前对内体离子运输机制和CLC调节的理解进行修订.
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