静电相互作用会影响对抗OXA-48类β-乳酸酶的diazabicyclooctane抑制剂的功效
Joseph F Hoff1, Kirsty E Goudar1, Karina Calvopiña2
1School of Cellular and Molecular Medicine, University of Bristol Bristol BS8 1TD UK Jim.Spencer@bristol.ac.uk.
RSC medicinal chemistry
|September 10, 2025
概括
新的二甲基环氧 (DBO) 抑制剂,阿维巴克坦和纳库巴克坦,对与OXA-48类似的卡巴酶具有不同的效力. 在OXA-48中的Arg214影响了纳库巴克坦的结合,影响了耐药细菌感染的治疗策略.
科学领域:
- 生物化学和分子生物学
- 抗微生物耐药性 抗微生物耐药性
- 结构生物学 结构生物学
背景情况:
- 产生碳酶的肠道细菌对公众健康构成重大威胁,复杂化了对多药耐药性细菌感染的治疗.
- OXA-48 碳烯酶是一种普遍存在的酶,它会对碳烯胺抗生素产生耐药性.
- 像阿维巴克坦和纳库巴克坦 (nacubactam) 这样的二氧化环聚胺 (DBO) 抑制剂对于克服β-乳酸酶介导的耐药性至关重要.
研究的目的:
- 调查阿维巴克坦和纳库巴克坦对OXA-48及其变体 (OXA-163,OXA-405) 的抑制机制.
- 阐明差异性抑制的结构基础,特别是β5-β6循环的作用.
- 了解OXA-48类酶的序列变化如何影响抑制剂反应.
主要方法:
- 酶抑制试验测定了阿维巴克坦和纳库巴克坦对OXA-48,OXA-163和OXA-405.5的功效.
- 进行X射线晶体学和分子动力学模拟,以可视化和分析酶-抑制剂相互作用.
- 质谱法用于研究酶对结合的DBOs的脱硫.
主要成果:
- 与阿维巴克坦相比,纳库巴克坦对OXA-48的疗效明显较低,这种差异在OXA-163和OXA-405.5时减少.
- 结构分析显示,OXA-48和nacubactam中的Arg214之间存在静电排斥,OXA-163和OXA-405中由于缺少Arg214.5而缺少这种排斥.
- 所有测试的酶都被发现与脱硫酸结合的DBOs,这表明一个共同的失活路径.
结论:
- 在OXA-48β5-β6循环中存在Arg214是差异DBO抑制剂强度的关键决定因素.
- 像OXA-48的β-乳酸酶的序列变化可以改变它们与抑制剂的相互作用,从而影响治疗疗效.
- 了解这些结构-活性关系对于开发下一代碳烯酶抑制剂至关重要.
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