在Salmonella Typhi中抗阿兹罗米辛的机制:从动态行为到临床影响的分子见解
Syeda Farishta1, Rani Faryal1, Muhammad Waqas2
1Department of Microbiology, Quaid-i-Azam University Islamabad, Islamabad, Pakistan.
Journal of biomolecular structure & dynamics
|July 3, 2025
概括
沙门氏菌Typhi中阿兹罗密辛耐药性正在增加,原因是AcrB基因中的特定R717L突变. 这一发现突显出迫切需要新的抗生素策略来对抗广泛耐药的伤寒.
科学领域:
- 微生物学 微生物学
- 遗传学 是一个遗传学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 在COVID-19大流行期间广泛使用阿齐思罗米可能增加了沙门氏菌Typhi耐药性.
- 沙门氏菌的广泛耐药性 (XDR) 是一个日益严重的全球健康问题,特别是在巴基斯坦.
研究的目的:
- 调查来自巴基斯坦的XDR沙门氏菌Typhi分离物中抗阿兹胺素耐药性的出现和分子机制.
- 识别产生耐药性的基因突变,并分析它们对抗生素疗效的影响.
主要方法:
- 对424例确诊的沙门氏菌Typhi和Paratyphi A病例进行了抗菌敏感性测试和基于PCR的桑格测序.
- 用分子动力学 (MD) 模拟和结合自由能量计算来评估鉴定出的突变对AcrB蛋白和阿兹胺蛋白相互作用的影响.
主要成果:
- 在ACRB基因中的R717L突变被确定为XDR沙门氏甲型杆菌中阿兹罗密辛耐药性的关键标志物.
- 这种突变显著降低了阿齐思罗米与AcrB蛋白的结合亲和力,改变了其结构和稳定性.
- 在耐药分离物中观察到blaCTX-M和blaTEM基因的高患病率.
结论:
- 在AcrB中的R717L突变是沙门氏菌Typhi中抗阿兹罗密抗性的发展的一个关键因素.
- 迫切需要开发新的抗生素策略来对抗这种新兴的耐药性.
- 这项研究强调了合理使用抗生素和持续监测的必要性,以有效管理伤寒热.
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