Ω-Loop 突变通过调节 PDC-3 β-乳酸酶中的键网络来控制活性位点的动态
Shuang Chen1, Andrew R Mack2,3, Andrea M Hujer2,4
1University College London, London, United Kingdom.
eLife
|January 21, 2026
概括
Pseudomonas-derived cephalosporinase-3 (PDC-3) 的 Ω-循环中的突变增强了其抗生素失活的功能. 这些变化改变了酶的结构和动力学,有助于Pseudomonas aeruginosa对胞的抵抗.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 细菌的抗生素耐药性是一个日益增长的全球健康威胁.
- 伪omonas-derived cephalosporinase-3 (PDC-3) 是一种关键的酶,在*伪omonas*物种中赋予了内在耐药性.
- 了解PDC-3耐药性的机制对于开发新的治疗策略至关重要.
研究的目的:
- 研究PDC-3的 Ω循环中临床观察到的突变对结构和功能的影响.
- 阐明这些突变如何影响酶动力学,活性部位属性和催化活性.
- 提供对新出现的β-乳糖酶变体的机制性理解.
主要方法:
- 强化学习驱动的分子动力学模拟.
- 恒定pH的分子动力学 (MD) 模拟.
- 马尔科夫状态模型 (MSM) 用于分析形态动力学.
主要成果:
- Ω 循环中的突变 (V211,G214,E219,Y221) 调节 Ω 循环和 R2 循环的灵活性,重塑活性部位腔.
- 特定的突变 (E219K,Y221A) 破坏结网络,改变关键残留物的pKa并促进质子转移.
- 在所有变体中观察到的活性部位口袋扩张适应了较大的胞子侧链,增强了催化活性.
结论:
- 在PDC-3 Ω循环中的单个残留物替代提供了改变催化活性和抗生素耐药性的机械基础.
- 这项研究提供了关于催化场的结构动态的见解,促进了对β-乳糖酶变体的理解.
- 这些发现可以为新型抑制剂的合理设计提供信息,以对抗耐药P. aeruginosa.
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