来自Pseudomonas aeruginosa的无水-N-乙muramic 酸激酶的催化过程
Amr M El-Araby1, Eva Jiménez-Faraco2, Rhona Feltzer1
1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA.
The Journal of biological chemistry
|September 3, 2023
概括
Pseudomonas aeruginosa anhydro-N-acetylmuramic acid (anhNAM) 激酶 (AnmK) 对于糖的回收和抗生素敏感性至关重要. 破坏AnmK会增加对伊米佩内姆的敏感性,突出其在细菌毒性中的作用.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 细菌细胞外,特别是糖,对于细菌的结构和生存至关重要.
- 参与糖合成,重塑和回收的酶是抗生素开发的关键目标.
- Pseudomonas aeruginosa AnmK 是二醇糖回收通路中的一种酶.
研究的目的:
- 对 Pseudomonas aeruginosa AnmK (AnmK) 进行全面的运动和结构分析.
- 阐明AnmK函数的催化机制和结构基础.
- 研究AnmK在细菌对抗生素敏感性的作用.
主要方法:
- 对AnmK及其基质,无水-N-乙胺酸 (anhNAM) 和ATP的动态分析.
- 用X射线晶体学来确定不同状态 (apo,基质结合,产品结合) 的AnmK的结构.
- 计算模拟以建模完整的催化循环.
- 带有破坏的anmK基因的P. aeruginosa菌株的遗传分析.
主要成果:
- AnmK遵循一个随机顺序的动力机制.
- 晶体结构揭示了独立的基质进入和封闭的催化状态.
- 蛋白循环可以作为anhNAM结合的门.
- 在P. aeruginosa中对anmK基因的破坏增加了对抗生素 imipenem 的敏感性.
结论:
- AnmK的结构和动力学提供了关于二醇糖回收的见解.
- AnmK将糖糖的循环利用与抗生素易感性和细菌毒性联系在一起.
- AnmK代表了新型抗生素策略的潜在目标.
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