Pin1通过RNF138促进人体CaV2.1通道聚基化:对2型情节性性动脉的病理生理学影响
Ssu-Ju Fu1, Kai-Min Cheng1, Cheng-Tsung Hsiao1,2,3
1Department of Physiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan.
Cell communication and signaling : CCS
|November 28, 2024
概括
基基 cis/trans 异构酶,NIMA 相互作用的 1 (Pin1) 调节了 ER 中的 CaV2.1 通道蛋白质稳定. Pin1促进了CaV2.1的降解,其抑制改善了CaV2.1的水平和功能.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在CaV2.1通道中的功能丧失突变会导致2型 (EA2) 插曲性动脉以及其他神经系统疾病.
- CaV2.1突变可以破坏蛋白质稳定,并导致与ER相关的野生类型 (WT) CaV2.1.1的降解.
- RNF138是一种E3泛基因酶,在ER中调解CaV2.1降解.
研究的目的:
- 为了研究CaV2.1通道的ER蛋白质稳定机制.
- 确定参与其ER质量控制的CaV2.1的新型约束合作伙伴.
- 了解Pin1在CaV2.1降解中的作用以及EA2突变的主导负效应.
主要方法:
- 通过神经元细胞模型确定Pin1为CaV2.1结合伙伴.
- 使用shRNA敲击和Pin1抑制剂 (ATRA) 来调节Pin1水平.
- 进行突变分析,绘制CaV上的Pin1相互作用部位的地图2.1.1.
- 生成Pin1不敏感的CaV2.1构造来评估Pin1的调节作用.
主要成果:
- Pin1与CaV2.1结合,并促进其多比基因化和蛋白质体降解.
- 抑制Pin1会增加内源的CaV2.1水平,并减少与ER相关的WT和突变通道的降解.
- Pin1与CaV2.1 II-III循环和C端中的特定酸化基因相互作用.
- 在ER质量控制过程中,Pin1在CaV2.1无化和降解中对RNF138的上游作用.
- Pin1对于EA2误解突变对WT CaV的主要负面影响至关重要2.1.1.
结论:
- Pin1是CaV2.1蛋白质稳定在ER的一个关键调节器.
- 取决于pin1的降解会影响EA2相关的神经疾病的严重程度.
- 无论是Pin1/RNF138依赖的路径还是独立的路径都控制了CaV2.1蛋白质稳定和突变效应.
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