LRRK2的酸化状态和激酶活性以Rab8a/Rab10依赖的方式调节 (宏) 自
Elżbieta Kania1,2,3, Jaclyn S Long1,2, David G McEwan1,2
1Cancer Research UK Beatson Institute, Garscube Estate, Switchback Road, Glasgow, G61 1BD, UK.
Cell death & disease
|July 15, 2023
概括
富含白的重复激酶2 (LRRK2) 酸化位调节自. 损坏的LRRK2酸化破坏了细胞废物清除,通过增加激酶活性,促进帕金森病的病理学.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 氨酸丰富的重复激酶2 (LRRK2) 的突变是帕金森病 (PD) 的主要遗传原因.
- LRRK2蛋白具有GTPase和激酶活性,受其酸化状态的影响.
- 构成性酸化位 (S910/S935/S955/S973) 在LRRK2功能中的作用在很大程度上是未知的.
研究的目的:
- 研究LRRK2酸化在S910/S935/S955/S973位点在自调节中的作用.
- 确定改变LRRK2酸化对细胞 lysosomal 功能和自流的影响.
- 在帕金森病模型中阐明LRRK2激酶活性,酸化状态和自功能障碍之间的机械联系.
主要方法:
- 生成四倍的LRRK2突变细胞 (4xSA) 来模仿减少酸化.
- 利用LRRK2激酶抑制剂 (MLi-2,PF-06447475) 来评估激酶活性调节对自的作用.
- 分析了下游LRRK2酸化标 (Rab8a,Rab10) 和它们在自中的作用.
- 检查了表达致病性LRRK2 R1441C突变的细胞.
主要成果:
- 具有四重LRRK2基突变 (4xSA) 的细胞表现出 lysosomal 功能受损,并且未能在饥饿期间诱导自.
- 尽管LRRK2激酶抑制剂在S910/S935/S955/S973降低了酸化,但并没有影响自.
- 4xSA细胞的自性损伤归因于增强的LRRK2激酶活性,由Rab8a和Rab10的酸化增加证明.
- 缺乏酸化的Rab8a和Rab10突变体的表达挽救了自性缺陷.
- 病理性LRRK2 R1441C突变细胞显示自减少和构成性酸化减少,与激酶活性增加相关.
结论:
- 在S910/S935/S955/S973位点的LRRK2酸化对于在基底和饥饿条件下的自调节至关重要.
- 增强的LRRK2激酶活性,而不是这些部位的直接酸化状态,导致LRRK2相关的帕金森病的自功能障碍.
- 这些发现突显了LRRK2酸化,激酶活性和自之间复杂的关系,为帕金森病的发病过程提供了洞察力.
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