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机械的洞察力到E. 大肠杆菌从增长停止中恢复

Ahmed Hassan, Yuko Nakano, Howard Gamper

bioRxiv : the preprint server for biology

|January 16, 2026

概括

细菌蛋白 RimM (核糖体成熟因子) 对于在生长停止后重新启动蛋白质合成至关重要. 它的缺失延迟了核糖体组装,促使细菌促进核糖体机械生产以恢复.

科学领域:

微生物学微生物学
分子生物学分子生物学
细菌生理学细菌生理学

背景情况:

细菌停止蛋白质合成以生存压力.
停药后恢复生长和蛋白质合成的理解很少.
RimM是细菌30S核糖体亚单元成熟的一个关键因素.

研究的目的:

研究细菌如何从增长停止中恢复.
阐明RimM在恢复蛋白质合成中的作用.
了解防止早期核糖体组装的机制.

主要方法:

使用了一种表现为长期增长停止的*E. coli* Δ*rimM*菌株.
在 Δ*rimM* 核糖体上进行了冷电子显微镜 (Cryo-EM).
分析了核糖体组合,启动因子占用率和沉默因子招募.

主要成果:

失去RIMM显著延迟了30S子单元头域的成熟.
化EM检测显示,核糖体蛋白征集延迟,并增加了启动因子 (IF1,IF3).
观察到RsfS招募到50S子单位,并增加了核糖体机械生产.

结论:

RimM辅助的30S头部域组件对于细菌从生长停止中恢复至关重要.
延迟的核糖体组装起到防止过早的70S核糖体形成的保护作用.
细菌重新编程能量分配,在恢复过程中过度生产核糖体组件.

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