通过eIF6调节核糖体子单元协会对于线粒体退出和癌症进展至关重要
bioRxiv : the preprint server for biology
|July 9, 2024
概括
细胞转化启动因子6 (eIF6) 调节核糖体的可用性,影响细胞分裂和癌症. 破坏eIF6功能会增加空缺的核糖体,影响线粒转化和限制癌症的入侵.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生化学
背景情况:
- 核糖体生物发生和功能受到严格调节,以维持细胞平衡.
- 细胞翻译启动因子6 (eIF6) 是60S核糖体子单元的关键调节者,影响翻译启动.
- 活跃的核糖体子单元的可用性对于全球翻译率至关重要,特别是在细胞分裂过程中.
研究的目的:
- 调查eIF6在调节活性核糖体子单元池中的作用.
- 阐明eIF6在60S核糖体生物生成中的作用之外的独特功能.
- 探索eIF6功能障碍对线粒体翻译和癌症进展的影响.
主要方法:
- 利用eIF6的N106S突变来破坏其与60S核糖体子单元的相互作用.
- 分析了eIF6突变对空缺的80S核糖体水平的影响.
- 进行了Ribo-Seq分析,以评估特定转录的翻译效率.
- 与临床样本中的癌症侵袭相关的eIF6表达水平.
主要成果:
- 扰乱eIF6-60S相互作用增加了空缺的80S核糖体,表明在核糖体反关联中发挥了作用.
- eIF6 功能障碍导致了线粒分裂期间的翻译失调,导致染色体分离缺陷和线粒分裂灾难.
- 在eIF6-N106S突变中,Ribo-Seq揭示了线粒体因子和长3'UTRs的转录的下调翻译.
- eIF6-N106S突变限制了癌症入侵,并且在高级入侵癌症中观察到eIF6的过度表达.
结论:
- eIF6具有独特的抗关联活性,与其在核糖体生物发生中的作用分开.
- 通过eIF6调节80S核糖体的可用性对于线粒体翻译和进展至关重要.
- eIF6的放松调节与癌症的进展有关,特别是在高度侵入性类型中,这表明它不是一个早期事件.
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