在Vibrio cholerae中,氨基糖化物耐受性涉及与queuosine tRNA修饰相关的翻译重编程
Louna Fruchard1,2, Anamaria Babosan1, Andre Carvalho1
1Institut Pasteur, Université Paris Cité, Unité Plasticité du Génome Bactérien, Paris, France.
eLife
|January 6, 2025
概括
该Tgt酶修改tRNA,对于抗生素压力下的细菌生长至关重要. 它的缺失会改变蛋白质翻译,影响氧化应激反应和DNA修复.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在tRNA中,Tgt酶催化了氨酸转化为queuosine (Q) 的转化,具有GUN抗.
- 这种修改对于*Vibrio cholerae*在亚致死的氨基甘油酸抗生素压力下最佳生长至关重要.
研究的目的:
- 为了研究Q34修饰在托布拉米辛暴露期间的编码码效率中的作用.
- 描述Q34对细菌蛋白质组的影响,阐明抗生素转化应激反应的分子机制.
主要方法:
- 利用分子记者来评估氨酸氨酸代码子的代码解码效率.
- 进行蛋白质组学分析以确定蛋白质表达的变化.
- 进行了in silico分析,以预测用于翻译调节的目标转录.
主要成果:
- 证明Q34的修改影响了氨酸TAT和TAC编码子的解码效率.
- 缺少*tgt*导致抗SoxR因子RsxA的翻译增加,该因子对氨酸TAT具有代偏差.
- 过多的RsxA导致SoxR氧化应激规律内的基因表达减少.
结论:
- 调节Q34 修改以响应环境线索可以重新编程特定转录的翻译.
- 可调整的转录,包括DNA修复因子,在细菌抗生素反应中起着核心作用.
- 这项研究阐明了一种新的细菌适应抗生素压力的机制,涉及tRNA修饰和转化控制.
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