反应性氧气排毒 有助于Mycobacterium abscessus 抗生素生存
Nicholas A Bates1,2, Ronald Rodriguez3,4, Rama Drwich1
1Department of Internal Medicine, University of California, Davis, California, USA.
bioRxiv : the preprint server for biology
|November 18, 2024
概括
细菌持续性细胞通过排毒活性氧物种 (ROS) 来在抗生素中存活. 这项研究确定了关键基因,包括KatG催化酶-过氧化酶,这对于在抗生素压力下持续细胞存活至关重要.
科学领域:
- 微生物学 微生物学
- 细菌学 细菌学是一门学科.
- 分子生物学分子生物学
背景情况:
- 杀菌性抗生素杀死大多数细菌,但一个亚种群,持久细胞,在休眠状态下生存.
- 压力状况,如营养缺乏会增加细胞频率,但生命力和调节的潜在机制仍然不清楚.
研究的目的:
- 为了确定使抗生素在菌根菌中的持久性成为可能的遗传因素.
- 在 * Mycobacterium abscessus * 中比较自发和压力诱导的持久状态.
主要方法:
- 在*Mycobacterium abscessus*中进行了转子体突变高通量测序 (Tn-Seq) 选.
- 研究了活性氧物种 (ROS) 和KatG催化酶-过氧化酶在持续性细胞存活中的作用.
- 评估了缺氧对杀死细菌和持续细胞活力的影响.
主要成果:
- Tn-Seq确定了对自发性和压力诱导的持续性细胞至关重要的基因.
- 意外地发现了参与活性氧物种 (ROS) 排毒的多个基因.
- 内源性ROS在抗生素暴露后增加,KatG对于自发性和饥饿诱导的持久性生存至关重要.
- 低氧减少了细菌的杀死,并使KatG变得无用,这表明ROS积累放大了抗生素的致命性.
结论:
- 在真菌细菌中抗生素的持久性涉及ROS解毒途径.
- KatG 催化酶-过氧化酶在持续性细胞存活中起着重要作用,特别是在有氧条件下.
- 缺氧调节了抗生素的疗效,突出了环境因素和细菌生存策略之间的复杂相互作用.
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