在膜环境中通过分子动力学模拟研究的多素抗性决定因素MCR-1的动态行为和基质相互作用
Emily Lythell1,2, Jack Badley1, Reynier Suardíaz1,3,4
1Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.
Journal of chemical information and modeling
|July 22, 2025
概括
移动胆固醇耐药性 (MCR) 酶赋予抗生素耐药性. 分子动力学模拟显示了有限的域运动和"乒乓球"机制,单MCR-1酶已准备好进行第一个反应阶段.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 移动胆固醇耐药性 (MCR) 酶是等离子体传播的甲胺 (PEtN) 转移酶,赋予对胆固醇,一种关键的抗生素的耐药性,特别是在大肠杆菌.
- 了解完整的MCR酶结构和机制是有限的,之前的研究集中在孤立的催化域或相关酶上.
- 细菌PEtN转移酶具有催化和整体膜域,影响它们与细胞膜的相互作用.
研究的目的:
- 用分子动力学模拟来研究全长MCR-1的动态行为.
- 探讨固态度和基质结合对MCR-1结构和功能的影响.
- 阐明由MCR酶所赋予的胆固醇抗性的机制.
主要方法:
- 在模拟膜环境中对全长MCR-1模型进行分子动力学模拟.
- 在不同度和PEtN捐赠基质 (POPE) 下分析酶动态.
- 关键残留物 (如Glu116) 的局部定向突变发生,以评估功能影响.
主要成果:
- 模拟显示,全长MCR-1的域移动有限,这表明其结构相对稳定.
- 在适合PEtN转移到单状态中的Thr285残留物时,观察到POPE结合.
- 在特定条件下观察到第二个离子结合,由Glu116在跨膜域中稳定;Glu116的突变取消了MCR-1活动.
结论:
- MCR酶域运动是条件依赖的,支持"乒乓"反应机制.
- MCR-1的单形式对催化循环的初始步骤有能力.
- 跨膜域,特别是Glu116,在MCR-1功能和胆固醇抵抗方面发挥着至关重要的作用.
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