三级可塑性驱动色素7B与脂质膜相互作用的效率
Yi Zhuang1, Stephen Quirk2, Erica R Stover1
1Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States.
The journal of physical chemistry. B
|February 27, 2024
概括
改变素7B抗微生物的疏水核可以增强它们的膜相互作用和杀死细菌的效率. 破坏核心的稳定性会增加的透率和对抗格兰正细菌的有效性.
科学领域:
- 微生物学 微生物学
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 抗微生物 (AMP) 通过与微生物膜相互作用来杀死细菌.
- 素,像素7B一样,是AMP,对于对抗阳性细菌至关重要.
- 膜相互作用涉及结合,螺旋解封和脂质双层透,由疏水性核心破坏驱动.
研究的目的:
- 调查三级结构可塑性在素7B的膜相互作用和抗菌活性中的作用.
- 描述如何破坏疏水性核心的稳定性会影响素7B的功能.
主要方法:
- 构建素单位突变的素7B,以破坏疏水核的稳定性.
- 使用循环二重化 (CD) 光谱和化配置文件进行实验分析,以评估结构和稳定性.
- 功能性测定包括最小抑制度 (MIC) 和素释放以测量抗微生物活性和膜透.
- 使用自适应导向分子动力学 (ASMD) 分析的机械展开和自由能量景观的计算模拟.
主要成果:
- 疏水核的稳定性降低与增强的膜透效率相关.
- 具有不稳定的疏水核的突变体显示出增加了杀死细菌的有效性.
- 结构,稳定性和功能的实验发现得到了ASMD计算模拟的支持.
- ASMD揭示了与实验趋势相关的野生类型和突变之间的自由能量差异.
结论:
- 三级结构可塑性,特别是疏水性核心不稳定性,是素7B抗菌机制的关键因素.
- 调节疏水性核心稳定性提供了一种提高AMP疗效的策略.
- 计算和实验方法为AMP-膜相互作用提供了互补的见解.
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