由C9orf72重复编码的多 dipeptides 结合核细胞,阻碍RNA生物发生,并杀死细胞
Ilmin Kwon1, Siheng Xiang1, Masato Kato1
1Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9152, USA.
概括
具有氨酸:氨酸 (SR) 域的RNA结合蛋白与hnRNPA2水凝结合. 通过CLK1/2的酸化逆转结合,而C9orf72疾病因破坏RNA生物发生而导致细胞死亡.
科学领域:
- 分子生物学分子生物学
- 神经退行性疾病 神经退行性疾病
- 生物化学 生物化学
背景情况:
- 血清:氨酸 (SR) 重复域在RNA调节蛋白中至关重要,它们参与了前传递 RNA 拼接.
- 异质核糖蛋白A2 (hnRNPA2) 的低复杂性域可以形成纤维聚合物和水凝滴.
- C9orf72基因扩展与神经退行性疾病有关,并产生GRn和PRn重复聚.
研究的目的:
- 为了研究SR域与hnRNPA2水凝之间的相互作用.
- 确定酸化在调节SR域-hnRNPA2凝结合中的作用.
- 检查C9orf72衍生物,特别是GRn和PRn在hnrnpa2水凝和细胞过程中的细胞作用.
主要方法:
- 在体外结合试验中使用SR域和hnrnpa2水凝进行了结合试验.
- 使用CDC2类激酶1和2 (CLK1/2) 的酸化试验.
- 哺乳动物细胞中SR域变异和C9orf72的表达.
- 细胞局部化研究和RNA生物发生和细胞活力的评估.
主要成果:
- SR 域与 hnRNPA2 水凝结合,这种结合通过 CLK1/2 酸化而逆转.
- 突变的SR-to-GR变体独立于CLK1/2结合hnnRNPA2基,并局部化到细胞中的细胞核.
- 来自C9orf72的GRn和PRn结合hnnRNPA2基,独立于CLK1/2活性,进入细胞,局部化到核细胞,并抑制RNA生物发生,导致细胞死亡.
结论:
- 通过CLK1/2的酸化是SR域与hNRNPA2水凝相互作用的关键调节机制.
- C9orf72衍生模仿SR域相互作用,但破坏细胞功能,这表明神经退行性疾病中的潜在病原机制.
- 这些发现突出了异常蛋白质-核酸相互作用在疾病发病过程中的作用,并提供了对RNA生物发生调节的见解.
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