eRF1降解剂SRI-41315在核糖体解码中心起到分子的作用
João P L Coelho1, Matthew C J Yip1, Keely Oltion2
1Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
Nature chemical biology
|January 3, 2024
概括
小分子SRI-41315将eRF1与核糖体结合,导致碰撞并增强翻译终止. 这揭示了针对 eRF1 的新方法,用于与过早停止密码子相关的疾病.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 药物发现 药物发现 药物发现
背景情况:
- 翻译终结对于蛋白质合成至关重要,并且是因过早停止密码子引起的疾病的治疗点.
- 细胞翻译终结因子1 (eRF1) 识别停止子,释放新生的蛋白质,并回收核糖体.
- 小分子SRI-41315通过触发eRF1降解来增强过早停止编码子的翻译读透,但其机制尚不清楚.
研究的目的:
- 阐明SRI-41315对eRF1的作用机制及其对翻译的影响.
- 为了解SRI-41315如何与eRF1和核糖体相互作用提供结构性见解.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定SRI-41315作用的结构基础.
- 生物化学试验评估SRI-41315对翻译终结和核糖体功能的影响.
主要成果:
- 冷EM结构显示SRI-41315作为一种金属依赖的分子剂,将eRF1的N域与解码中心附近的核糖体子单元接口连接起来.
- 通过SRI-41315介导的eRF1在核糖体上的保留会诱导核糖体碰撞和eRF1无处不在.
- 这导致了近同源的停止编码子的翻译终结增加,增强了过早终结编码子的阅读度.
结论:
- SRI-41315采用一种新的释放因子抑制机制,通过在核糖体上稳定 eRF1.
- 这些发现提供了新的策略,用于药理上准 eRF1,以治疗与过早停止密码子相关的疾病.
- 这项研究揭示了对理解核糖体碰撞和转化控制的含义.
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