EPISODE · Sep 6, 2026 · 25 MIN
1546-Metis：感知宿主基因组降解的细菌防御系统
from 聊聊Sci
这篇文章介绍了一种名为 Metis 的新型细菌免疫防御系统，它能通过识别宿主基因组降解产生的修饰单核苷酸来感知病毒入侵。当噬菌体破坏细菌 DNA 时，产生的 m6dAMP 分子会作为信号激活该系统。Type I Metis 通过快速耗尽细胞内的 NAD+ 能量来中止感染，而 Type II Metis 则利用一种跨膜蛋白效应子破坏细胞膜完整性。这种防御机制虽然无法挽救已被破坏基因组的个体细菌，但能有效阻止病毒复制，从而保护周围的细菌群体免受流行病侵害。研究还揭示了系统中 MisB 蛋白的作用，它负责清理低水平的代谢副产物以防止系统在无病毒状态下错误启动。References:Osterman I, Hurieva B, Moses S, et al. Bacteria sense virus-induced genome degradation via methylated mononucleotides[J]. Science, 2026: eaed6782.前往小宇宙评论区与主播互动
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1546-Metis：感知宿主基因组降解的细菌防御系统
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