一个Teixobactin衍生物的X射线晶体结构揭示了粉样组件
Hyunjun Yang1, Michał Wierzbicki1, Derek R Du Bois1
1Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States.
Journal of the American Chemical Society
|October 9, 2018
概括
抗生素提克索巴克丁衍生物形成粉样纤维. 这些结构为阳离子创造了结合点,表明了向细菌细胞壁前体的机制.
科学领域:
- 生物化学
- 结构生物学
- 抗菌研究
背景情况:
- 泰克索巴克是一种有效的抗生素,可对抗阳性细菌.
- 了解teixobactin的作用机制对于对抗抗生素耐药性至关重要.
- 抗生素的自我组装特性可以影响它们的疗效和向相互作用.
研究的目的:
- 为了阐明teixobactin衍生物的X射线晶体结构.
- 研究teixobactin的超分子组合及其在结合中的作用.
- 根据其结构组合提出teixobactin的作用机制.
主要方法:
- 使用X射线结晶学来确定teixobactin衍生物的结构.
- 使用提奥夫拉T光测定和传输电子显微镜 (TEM) 来研究纤维细胞的形成.
- 使用生物物理技术分析离子与组装结构的结合.
主要成果:
- 一个活跃的teixobactin衍生品自组装成粉样纤维.
- 一种修饰的teixobactin衍生物结晶为双螺旋的β-sheets.
- 这些β-片组具有离子的结合点,例如硫酸盐.
- 乙叶二聚体的N端甲基和C端宏循环参与离子结合.
结论:
- 泰克索巴克衍生物组合成更高阶结构,形成离子结合口袋.
- 这种自我组装机制被认为对teixobactin结合脂质II和细菌细胞壁前体的能力至关重要.
- 这些发现提供了teixobactin的结构-活性关系及其作为治疗剂的潜力.
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