在人类癌症中对eIF4F复杂功能和结构的计算推断
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115.
概括
癌细胞利用不同的翻译启动途径,包括涉及真核细胞启动因子 (eIF) 的上限依赖和上限独立机制. 这项研究揭示了基因放大和对这些过程的结构洞察力,影响了癌症存活率.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 结构生物学 结构生物学
背景情况:
- 在真核生物中,正规翻译启动依赖于真核生物启动因子4F (eIF4F) 复合体 (eIF4G1,eIF4A1,eIF4E) 进行依赖的mRNA结合.
- 另一种独立于盖的翻译启动通过内部核糖体进入点 (IRES) 发生,涉及eIF4G1和eIF4A1,对于处于压力状态的癌细胞至关重要.
- 在人类癌症中,控制这些启动途径的选择的精确分子机制尚不清楚.
研究的目的:
- 研究基因拷贝数变异 (CNVs) 和人类癌症中翻译启动因子的表达模式.
- 阐明上限依赖和上限独立的翻译启动机制的结构基础.
- 了解翻译启动因子变化与癌细胞生存途径之间的相关性.
主要方法:
- 在癌症基因组图谱 (TCGA) 瘤样本中对基因拷贝数变异 (CNV) 的分析.
- 对转化启动因子和癌细胞生存途径的基因表达数据的相关性分析.
- 结构建模的eIF4F复合物使用AlphaFold预测,对两个上限依赖和上限独立的启动状态.
主要成果:
- 在人类癌症中观察到翻译启动基因的频繁放大,特别是EIF4G1和EIF3E的同时发生的增长.
- EIF4G1放大与细胞周期和脂质生成基因的表达增加相关,这表明它在癌症生存中发挥了作用.
- 结构建模揭示了eIF4G1与eIF4E和eIF4A1的不同交互模式,区分了依赖和独立的启动路径.
结论:
- 转化启动因子基因拷贝数量和表达的变化在人类癌症中很普遍,并且与癌症细胞存活率有关.
- 结构洞察力强调了eIF4G1如何调节与eIF4A1和eIF4E的相互作用,以调节不同的翻译启动机制.
- 了解这些途径为调节癌症转化提供了潜在的治疗点.
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