在无细胞系统中对核糖体的直接可视化揭示了aminoglycoside的功能进化
Junta Tomono1, Kosuke Asano1, Takuma Chiashi1
1Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
Journal of biochemistry
|January 16, 2024
概括
一种新的冷电子显微镜方法,在无细胞翻译系统 (DARC) 中直接可视化抗生素对核糖体的结合,可视化了抗生素对核糖体的作用. 这种方法揭示了抗生素进化如何增强药物开发的结合亲和力.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 药物发现 药物发现 药物发现
背景情况:
- 多种耐药细菌的兴起需要开发新的抗生素.
- 在分子水平上了解抗生素的作用机制对于有效的药物设计至关重要.
研究的目的:
- 引入一种新的冷电子显微镜方法 (DARC),用于在无细胞系统中可视化抗生素与核糖体的相互作用.
- 研究2-DOS氨基糖化抗生素的进化增强,特别是迪贝卡辛 (DBK) 和阿伯卡辛 (ABK).
主要方法:
- 开发和应用使用冷电子显微镜在无细胞翻译系统 (DARC) 方法中直接可视化抗生素结合于核糖体的方法.
- 在宏分子拥挤条件下对核糖体-抗生素复合物的分析.
- 生物化学分析与冷EM观察同时进行.
主要成果:
- 达克方法可以可视化抗生素与翻译核糖体结合,而不需要核糖体净化.
- 冷-EM结构显示,阿贝卡辛 (ABK) 具有合成定制的γ-amino-α-hydroxybutyryl (HABA) 基因,与迪贝卡辛 (DBK) 相比,增强其与核糖体的结合亲和力.
- 这种增强的结合归因于HABA动机促进的额外相互作用.
结论:
- DARC方法为了解抗生素机制和促进药物开发提供了一个强大的工具.
- 2-DOS氨基甘油酸的演变表明,通过量身定制的结构修改来提高抗生素疗效的成功策略.
- 有针对性的结构修改可以显著提高抗生素结合亲和力,并可能克服耐药性机制.
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