(p) ppGpp在葡萄糖转化为脂肪酸的过程中调解了大肠杆菌的持续形成
Ruixue Zhang1, Zhengyang Xiao1, Neha Namburi1
1Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO, United States.
Frontiers in microbiology
|February 2, 2026
概括
脂肪酸的转移通过提高 (p) pGpp水平,大大增加了细菌的持续性细胞. 针对这些代谢途径可以减少抗生素耐药性和复发性感染.
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:
- 细菌的持久性是抗生素治疗失败和复发感染的关键因素.
- 对于持续性细胞形成的代谢触发因素尚不清楚.
- 研究大肠杆菌*中的营养转移可以阐明持久性机制.
研究的目的:
- 调查不同碳源在大肠杆菌持续形成中的作用.
- 确定影响营养下降后持续发展的代谢线索,特别是 (p) p Gpp.
- 确定减少细菌持久性的潜在治疗点.
主要方法:
- 在从葡萄糖转移到各种碳来源 (脂肪酸与葡萄糖原性碳) 后,对大肠杆菌的持久性进行比较分析.
- 使用基于RNA的生物传感器和HPLC量化瓜诺辛四和五酸盐[p) pGpp]水平.
- 基因操纵 (过度表达乙基-ACP合成酶和PlsB) 以评估其对 (p) pGpp水平和持久性的影响.
- 使用C同位素追踪和代谢学进行代谢分析,以了解固细胞中的碳流量.
主要成果:
- 从葡萄糖转变为脂肪酸的*大肠杆菌*诱导的持久水平明显高,与转变为糖原性碳素相比.
- 在葡萄糖转化为脂肪酸后,在长时间的碳饥饿期间观察到高 (p) pGpp水平,与持续性增加相关.
- 减少滞后阶段的持续时间或操纵 (p) pGpp合成/抑制途径减少了形成的持续性.
- 持久细胞表现出代谢适应性,将碳流转向葡萄糖生成和酸途径.
结论:
- 在大肠杆菌中, (p) p Gpp 信号分子在营养物质转移引起的持续形成中起着至关重要的作用.
- 代谢适应,包括流入葡萄糖生成和酸途径,支持持续的细胞存活.
- 针对 (p) pGpp相关途径和代谢重塑提供了打击抗生素耐药性和复发性感染的潜在策略.
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