通过获得大型活性场电场,β-乳酸酶对抗抗生素
1Department of Chemistry, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|November 18, 2022
概括
酶活性部位的电场通过改变共价键反应性来驱动抗生素耐药性的演变. 了解这些领域有助于设计新药来克服抗药性.
科学领域:
- 生物化学
- 蛋白质进化
- 药物发现
背景情况:
- 在酶活性位点中的共价结合化合物可以根据结合可变性作为基质或抑制剂起作用.
- 细菌对青素G (PenG) 耐药性的例子是青素结合蛋白 (PBPs) 和TEMβ- lactamases等酶的进化适应.
- 艾维巴克坦 (Avb) 是为了抵消对β- 乳酸抗生素的耐药性机制而开发的.
研究的目的:
- 研究蛋白质活性部位中的电场在抗生素耐药性演变过程中对共价键的反应性的作用.
- 了解像TEMβ- lactamases这样的酶的进化变化如何影响抗生素酶添加物的水解率.
- 通过分析蛋白质进化的静电催化,探索新的共价药物的设计原理.
主要方法:
- 通过蛋白质进化追踪酶活性位点中的共价键的反应性.
- 分析蛋白质活性位点内的电场对素G (PenG) 添加物的解的影响.
- 使用静电催化和振动光谱的框架来测量电场.
主要成果:
- 由于小的活性位点电场,素结合蛋白-PenG添加剂中的结是抗水解的.
- 在TEMβ-lactamase-PenG添加物中,增强的电场 (从-59到-140 MV/cm) 降低了水解能量屏障,使反应加速了5个数量级.
- 阿维巴克坦 (Avb) 通过在低电场环境中存在的共价连接来克服电阻,从而避免快速水解.
结论:
- 蛋白质活性部位的电场是抗生素耐药性的发展的一个关键因素.
- 通过电场强度量化的静电催化为理解酶进化和抗生素耐药性提供了统一的原则.
- 电场指标可以指导新型共价药物的合理设计, 以有效地对抗抗生素耐药性.
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