多聚胺通道调节贝克林1依赖的自
Avraham Ashkenazi1, Carla F Bento1, Thomas Ricketts1
1Department of Medical Genetics, Cambridge Institute for Medical Research (CIMR), University of Cambridge, Cambridge, UK.
Nature
|April 27, 2017
概括
蛋白质中的多重胺 (polyQ) 管道扩大导致神经退行性疾病. 这项研究揭示了野生类型的polyQ通道通过稳定贝克林1来实现自,这种功能因致病的polyQ扩张而被破坏.
科学领域:
- 神经生物学
- 分子生物学
- 遗传学
背景情况:
- 九种神经退行性疾病与蛋白质中的多重胺 (polyQ) 管道扩展有关.
- 在可溶性蛋白质形式中,PolyQ扩张会降低疾病发病年龄,并且具有毒性.
- 在细胞质蛋白中正常的polyQ通道的确切功能在很大程度上是未知的.
研究的目的:
- 阐明双化酶素3中的多Q域的功能.
- 研究多Q通道的长度如何影响蛋白质相互作用和细胞过程.
- 了解多Q扩张对神经退行性疾病的致病机制.
主要方法:
- 通过细胞和体内模型研究了野生型素3和贝克林1之间的相互作用.
- 在人类细胞系和小鼠神经元中评估了素-3 枯竭对饥饿诱导的自的影响.
- 研究了不同长度的多Q通道之间的竞争相互作用及其对自的影响.
主要成果:
- 野生类型的ataxin 3的polyQ域促进与beclin 1的相互作用,通过防止beclin 1的降解来促进自.
- 在细胞和动物模型中,阿素-3 耗尽显著抑制了饥饿诱导的自.
- 疾病蛋白质中的较长的多Q通道与野生型的ATAXIN 3竞争,在亨廷顿病模型和患者细胞中损害了自.
结论:
- 通过与贝克林的相互作用,野生类型的polyQ通道在维持自中起着至关重要的作用.
- 与疾病相关的多Q扩张通过与野生类型蛋白质竞争来破坏这种基本功能,从而导致自功能受损.
- 这种机制突出显示了神经退行性疾病中多Q扩张的新型非聚合性致病功能.
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