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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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  3. 通过enterobacter Ludwigii Es2对尼科硫生物降解的分子洞察的综合转录和酶特性
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  3. 通过enterobacter Ludwigii Es2对尼科硫生物降解的分子洞察的综合转录和酶特性

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通过Enterobacter ludwigii ES2对尼科硫生物降解的分子洞察的综合转录和酶特性

Yufeng Xiao1, Bingbing Yang1, Siya Wang1

  • 1College of Plant Protection, Jilin Agricultural University, Changchun 130118, China.

Journal of hazardous materials
|August 25, 2025

在PubMed 上查看摘要

概括
此摘要是机器生成的。

这项研究确定El-RutA是Enterobacter ludwigii ES2中降解除草剂尼可硫的关键酶. 一种利用El-RutA的工程细菌菌株显示出在农业生态系统中有效的尼科硫生物修复的希望.

关键词:
生物降解机制基因淘汰分子对接和动力学尼科硫蛋白质的表达位点定向的突变

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科学领域:

  • 环境微生物学
  • 生物修复
  • 生物化学

背景情况:

  • 农业生态系统中的尼科硫残留物存在环境风险.
  • 了解微生物降解机制对于有效的修复策略至关重要.
  • 在尼科硫分解过程中,Enterobacter ludwigii ES2的潜力得到了研究.

研究的目的:

  • 通过Enterobacter ludwigii ES2阐明尼科硫降解的分子途径.
  • 确定和描述尼科硫排毒的关键酶.
  • 评估工程菌株对尼科硫生物修复的潜力.

主要方法:

  • 使用UPLC-QTOF-HRMS来识别降解产品.
  • 使用转录基因分析来识别参与降解的候选基因.
  • 进行了基因淘汰,补充,异质表达,酶活性测定,分子对接和突变发生.

主要成果:

  • 确定了两个主要的降解产物:2-氨基硫-N,N-二甲基尼古丁胺和2-氨基-4,6-二甲基胺.
  • 证实El-RutA是一个关键的酶,其破坏减少了~60%的降解.
  • El-RutA在30°C,pH值7.0时表现出最佳活性,并催化脱甲基化,而Lys-227对基质结合至关重要.

结论:

  • 提供了对El-RutA介导的尼科硫降解的第一个机理洞察.
  • 一种表达El-RutA的工程 Bacillus subtilis菌株实现了显著的尼科硫降解 (60.10%).
  • 这项研究为开发用于减轻土壤中尼科硫污染的微生物策略提供了基础.