两个组件的核酶活性KELShedu系统通过流产性感染赋予广泛的抗菌活性
Hengwei Zhang1,2, Jiajia You1,2, Hanwen Zhou3
1Key Laboratory of Industrial Biotechnology of the Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
Science advances
|October 31, 2025
概括
大肠杆菌中的KELShedu系统通过在感染期间核酸水平下降时降解细菌DNA来保护菌体. 这种流产性感染机制是一种新的细菌防御策略.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 菌体研究 研究 菌体研究
背景情况:
- 细菌和菌体被锁定在一个进化军备竞赛中.
- 这推动了各种细菌防御机制的进化,包括CRISPR-Cas,BREX,Gabija和Shedu系统.
- 了解这些系统对于微生物防御和工程至关重要.
研究的目的:
- 在大肠杆菌 (Escherichia coli) 中描述两个组成部分的KELShedu系统.
- 阐明KELShedu通过堕胎性感染赋予菌体耐药性的机制.
- 研究核酸三酸盐 (NTP) 在KELShedu激活中的调节作用.
主要方法:
- 凯尔什杜成分 (KELA和KELB) 的生物化学表征.
- 测试测量KELB.的DNA裂变活性.
- 分析KELShedu系统在菌体感染期间对不同细胞内NTP水平的反应.
主要成果:
- 凯尔什杜系统由KELA (DNA结合) 和KELB (具有DUF4263域的核酶) 组成.
- 细胞内NTPs抑制了KELB的DNA分裂活动.
- 该系统在菌体复制过程中通过核酸枯竭被激活,导致DNA降解和流产性感染.
结论:
- 凯尔什杜系统作为一种新型细菌抗菌体机制.
- 激活是由菌体诱导的核酸枯竭触发的,导致非特异性DNA降解.
- 这项研究扩大了已知的细菌防御谱,并建议在微生物工程和治疗方面有潜在的应用.
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