在体外,SHIN-2 通过稳定氨酸氧甲基转移酶的活性位点循环,对 VanA 类型的抗胺素耐药的 Enterococcus faecium 产生强有力的活性
Hironori Hayashi1, Erika Saijo2, Kazushige Hirata3
1Division of Infectious Diseases, International Research Institute of Disaster Science, Tohoku University, 2-1, Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan.
Archives of biochemistry and biophysics
|September 23, 2024
概括
新型抗菌剂对于打击抗菌素耐药性 (AMR) 是至关重要的. (+) -SHIN-2,一种氨酸基甲基转移酶抑制剂,对抗无交叉耐药的抗万科胺素耐药细菌有前途,有助于新药设计.
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:
- 抗微生物耐药性 (AMR),特别是万科米辛耐药性,需要新型抗生素.
- 范A基因集群有助于在细菌物种之间传播万科米辛耐药性.
- 血清基甲基转移酶 (SHMT) 是一种潜在的抗菌点,但抑制机制需要阐明.
研究的目的:
- 为了研究SHMT抑制剂的结合机制.
- 确定通过 (+) -SHIN-2抑制Enterococcus faecium SHMT (efmSHMT) 的结构基础.
- 为了评估SHMT抑制剂对抗抗康素耐药细菌的疗效.
主要方法:
- 结晶学比较apo-和 (+) -SHIN-2-结合的efmSHMT结构.
- 在体外测试以评估 (+) -SHIN-2 对E. faecium的生物静态作用.
- 在efmSHMT活性部位内对结相互作用的分析.
主要成果:
- (+) -SHIN-2强烈与efmSHMT结合,通过关键键键结合稳定其活性位循环.
- (+) -SHIN-2与氨酸和pyridoxal 5'-phosphate辅因子形成键.
- (+) -SHIN-2在对万科胺素敏感的和对万A型万科胺素耐药的E. faecium.表现出生物静态效应.
- SHMT 抑制剂似乎不会诱导对范A型范科米的交叉耐药性.
结论:
- 对 (+) -SHIN-2结合的结构洞察力为设计新型SHMT抑制剂提供了基础.
- SHMT抑制剂代表了对抗AMR的有希望的策略,包括万科米辛耐药性.
- 缺乏交叉耐药性表明,SHMT抑制剂可以用于组合疗法.
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