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在酸途径突变体中,代谢重编程和改变细胞外特征增加了MRSA对β-乳酸抗生素的耐药性
Merve S Zeden1, Laura A Gallagher1, Emilio Bueno2
1Microbiology, School of Biological and Chemical Sciences, University of Galway, Galway, Ireland.
PLoS pathogens
|July 24, 2023
概括
酸通路 (PPP) 酶Pgl对MRSA抗生素耐药性产生影响. 一个pgl突变通过改变细胞壁组件和表面电荷,增加了抗氧化素耐药性,提供了新的抗菌药物标.
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:
- 中央代谢途径对于细菌毒性和抗生素耐药性至关重要.
- 黄杆菌中酸盐 (PPP) 途径,特别是6-基甲酸酶 (Pgl) 酶,在抗生素耐药性方面的作用尚未得到充分研究.
研究的目的:
- 调查PPP的功能,特别是PGL酶,调节MRSA (黄金葡萄球菌) 抗生素耐药性的作用.
- 阐明与Pgl缺乏相关的代谢和细胞变化及其对抗氧素耐药性的影响.
主要方法:
- 在MRSA中pgl基因的基因突变.
- 表型分析包括抗生素敏感性测试,细胞形态和溶解试验.
- 代谢分析和碳追踪用于研究代谢流量.
- 对抗性路径 (VraG,VraF,GraRS) 的基因操纵,以评估它们与PGL突变的相互作用.
主要成果:
- 一种pgl突变显著增加了MRSA对β-lactam抗生素的耐药性,特别是牛津,并减少了牛津诱导的溶解.
- 在PGL突变体中的代谢重编程显示,糖解和TCA循环的流量增加.
- 在pgl突变体中观察到降低的脂铁醇酸 (LTA) 水平和增加的阳性细胞表面电荷.
- 遗传证据表明,VraFG/GraRS复合体在调解与PGL突变相关的氧素耐药性表型.
结论:
- 该pgl基因在调节MRSA对β-乳酸抗生素的反应方面发挥着重要作用.
- 改变的LTA水平和增加的正表面电荷,由VraFG/GraRS系统调节,有助于增强缺乏Pgl.gl的MRSA中牛素耐药性.
- 针对PPP提供了开发针对MRSA的新型抗菌疗法的潜在策略.
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