封顶结合蛋白eIF4E的耗尽失调了氨基酸代谢基因表达的失调
Paige D Diamond1, Nicholas J McGlincy1, Nicholas T Ingolia2
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Molecular cell
|June 7, 2024
概括
对于mRNA翻译至关重要的基本蛋白质eIF4E在耗尽时惊人地显示出适度的影响. 它的缺失矛盾地将氨基酸代谢和压力反应联系在一起,揭示了新的监管见解.
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 生物化学
背景情况:
- 蛋白质合成是一个重要的,能源密集的过程,需要严格监管.
- 封顶结合蛋白质真核细胞启动因子4E (eIF4E) 是翻译中的一个关键的监管点.
- 细胞的需求和营养的可用性决定了蛋白质合成的速度.
研究的目的:
- 研究急性eIF4E枯竭对蛋白质合成和细胞反应的影响.
- 阐明连接翻译,代谢基因表达和压力反应的调节机制.
- 在环境挑战下确定控制蛋白质稳态的因素.
主要方法:
- 在细胞模型中急性耗尽eIF4E.
- 基因表达和蛋白质合成恢复的分析.
- 研究综合应激反应途径和GCN4.
- 通过其5' UTR和多A结合蛋白对Pho85环林5 (PCL5) 的转化控制的表征.
主要成果:
- eIF4E的耗尽对细胞生长和蛋白质合成恢复产生了适度的影响.
- 蛋白质合成受损矛盾地诱导了芳香氨基酸代谢基因和GCN4驱动的氨基酸生物合成调节.
- PCL5被确定为一种翻译调节剂,保持一致的蛋白与mRNA比率,部分是通过其长5' UTR多A通道和多A结合蛋白.
结论:
- eIF4E在将蛋白质合成与代谢基因调节联系起重要作用.
- 发现了控制细胞应激过程中的翻译和代谢适应的新机制.
- PCL5调节提供了一种维持蛋白质平衡在不同转化环境中的机制.
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