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聚Q扩展的ATAXIN-2聚合会通过隔离RNA酶DDX6损害细胞处理体的恒常性

Jian-Yang Wang¹, Ya-Jun Liu¹, Xiang-Le Zhang¹

¹State Key Laboratory of Molecular Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, PR China; University of Chinese Academy of Sciences, Beijing, PR China.

The Journal of biological chemistry

|May 29, 2024

概括

聚聚氨胺扩大型素-2 (Atx2) 蛋白质聚合物隔离DDX6,破坏细胞处理体 (P体) 和RNA代谢. 恢复DDX6水平可以挽救P体功能,为神经退行性疾病提供潜在的治疗点.

科学领域:

分子生物学分子生物学
神经科学是一个神经科学.
在RNA生物学,RNA生物学.

背景情况:

ATAXIN-2 (Atx2) 是一种具有多重氨酸 (polyQ) 通道的RNA结合蛋白.
在Atx2中的PolyQ扩张可以导致蛋白质聚合,这与神经退行性疾病 (如2型脊髓小脑动症 (SCA2)) 有关.
通过Atx2聚合促进神经退行症的确切机制尚未完全理解.

研究的目的:

研究Atx2聚合如何影响细胞处理体 (P体) 的组装和功能.
阐明Atx2聚合对RNA代谢和P体恒温的分子相互作用和后果.

主要方法:

生物化学测定生物化学测定
光成像技术是一种光成像技术.
蛋白质-RNA相互作用和细胞局部化的分析.

主要成果:

聚Q扩展 (PQE) Atx2将DEAD盒RNA基酶 (DDX6) 隔离成聚合物,由特定的RNA序列介导.
在这种相互作用中,Atx2的N端LSm域和DDX6的C端基酶域至关重要.
DDX6封存破坏P体组合,导致MARF1的释放,促进mRNA衰变和转化抑制.
恢复DDX6水平可以挽救P体的组合和功能,防止mRNA降解.

结论:

Atx2聚合会通过隔离诸如DDX6.6之类的必不可少的成分来损害P体恒温.
这种P体功能的干扰导致RNA代谢失调,与神经退行性疾病病理相关.
针对DDX6封存或恢复P体功能,为相关蛋白质病变提供了潜在的治疗策略.

关键词:

在DDX6 DDX6 中.在P体中,P体是P体.聚合方式聚合方式聚合方式 ATAXIN-2 的使用方法在mRNA衰变过程中.封存是一种封存.翻译性的镇压

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