在抗菌素耐药性赋予的核糖体甲基转移酶中解读决定因素
Ruchika Bhujbalrao1, Ruchi Anand1
1Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India.
Journal of the American Chemical Society
|January 10, 2019
概括
科学家设计了一种核糖体甲基转移酶 (rMtase) 来模仿抗生素耐药性酶. 这项研究揭示了确定RNA向的关键结构特征,为对抗病原体耐药性提供了洞察力.
科学领域:
- 分子生物学
- 生物化学
- 微生物学
背景情况:
- 核糖体RNA (rRNA) 的翻译后甲基化是病原体耐药性的关键机制.
- 核糖体甲基转移酶 (rMtases) 是该过程中的关键酶,但它们的基质特异性尚未完全理解.
- 了解这些决定因素对于开发抗生素耐药性的策略至关重要.
研究的目的:
- 在核糖体甲基转移酶 (rMtases) 中确定基质特异性的特定结构决定因素.
- 设计一个家庭的rMtase (KsgA) 以显示类似于抗生素耐药性相关的rMtases (Erms) 的特异性.
- 研究特定结构元素在RNA识别和宏抗性的作用.
主要方法:
- 使用进化分析和结构引导方法的组合来创建嵌合式rMtases.
- 设计和合成KsgA-Erm仿真体以改变基质的特异性.
- 进行了体内研究,以评估工程特异性的功能后果,包括对类的耐药性.
主要成果:
- 确定了罗斯曼折叠中的特定循环区域作为 rMtases 中相关RNA选择的关键决定因素.
- 成功设计KsgA以采用抗红色素甲基转移酶 (Erms) 的基质特异性.
- 证明了模拟结构在体内赋予了宏抗性,验证了工程特异性.
结论:
- 罗斯曼折叠中的特定环装饰对于rMtases的基质识别至关重要.
- 工程rMtase特异性为理解阻力机制提供了一个强大的模型.
- 这项研究为设计新型抑制剂奠定了基础,通过向这些酶来对抗抗生素耐药性.
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