ISRIB的结合揭示了核酸交换因子eIF2B中的一个调节部位
Alisa F Zyryanova1, Félix Weis2,3,4,5, Alexandre Faille2,3,4
1Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK. az310@cam.ac.uk ajw1000@cam.ac.uk dr360@medschl.cam.ac.uk.
概括
综合应激反应 (ISR) 抑制剂ISRIB与eIF2B复合体结合,揭示了一个关键的调节部位. 这种结构洞察力解释了ISRIB如何调节翻译,并为神经退行性疾病提供了潜在的治疗点.
科学领域:
- 分子生物学
- 结构生物学
- 神经科学
背景情况:
- 综合应激反应 (ISR) 是一个关键的细胞通路,调节转化,新陈代谢,记忆和免疫力.
- 压力诱导的真核转化启动因子2α (eIF2α) 抑制瓜核酸交换因子eIF2B,这是ISR的一个关键步骤.
- 在神经退行和创伤性脑损伤模型中,ISRIB是一种化学ISR抑制剂,具有神经保护作用.
研究的目的:
- 阐明ISRIB抑制ISR的分子机制.
- 确定ISRIB与eIF2B综合体互动的结构基础.
- 确定调节ISR的潜在治疗点.
主要方法:
- 用冷电子显微镜 (cryo-EM) 以4.1安格斯特罗姆分辨率确定与ISRIB结合的人类eIF2B的结构.
- 针对位点的突变发生,以调查ISRIB结合口袋中的残留物.
- 在体外和体内测试以评估突变对ISRIB活性的功能影响.
主要成果:
- 冷-EM结构显示ISRIB在eIF2Bβ和δ子单元的接口上结合.
- 在ISRIB结合口袋的残留物发生突变,证明了它们对ISRIB结合和细胞反应的重要性.
- 鉴定的结合部位为ISRIB逆转eIF2B的eIF2α介导衰减的能力提供了分子解释.
结论:
- 该研究揭示了eIF2B复合体内ISRIB的特定结合部位,阐明了其作用机制.
- 这种ISRIB-eIF2B相互作用的结构和功能特征为开发针对ISR的新疗法开辟了道路.
- 这些发现突显了利用该站点在各种疾病中调节翻译的潜力.
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