在人类tRNA合成酶上以ATP导向捕获生物活性草药
Huihao Zhou1, Litao Sun, Xiang-Lei Yang
1The Skaggs Institute for Chemical Biology, Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Nature
|December 25, 2012
概括
黄 (HF) 是人类prolyl-tRNA合成酶 (ProRS) 的一个依赖ATP的抑制剂. 结构显示HF模仿了普罗林和tRNA,同时结合ProRS上的两个位点.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 药物发现 药物发现 药物发现
背景情况:
- 发烧,来自长沙草药,历史上治疗疟疾.
- 热原 (Halofuginone,简称HF) 是一种发烧原的衍生物,在癌症和纤维性疾病中显示出治疗潜力.
- HF通过准人类prolyl-tRNA合成酶 (ProRS) 来抑制T(H) 17细胞分化,从而导致未充电的tRNA积累.
研究的目的:
- 为了阐明Halofuginone (HF) 抑制人类ProRS的结构机制.
- 了解ATP在HF结合和抑制中的作用.
- 探索开发针对合成酶的新型抑制剂的潜力.
主要方法:
- 进行X射线晶体学以确定与人类ProRS.RS结合的HF的2.0 Å结构.
- 生物化学试验,以调查依赖ATP的抑制.
主要成果:
- 该结构揭示了ATP结合方向HF同时占据两个不同的基质结合点在ProRS.
- HF的一个部分模仿了普罗林,另一个模仿了tRNA的3'端.
- HF作为一种新的ATP依赖性抑制剂,表现出双位点结合机制.
结论:
- 黄 (Halofuginone,简称HF) 是一种依赖ATP的,人类ProRS.的双位体抑制剂.
- 结构性发现表明,在疟疾治疗中,发烧药可能具有类似的机制.
- 这种双位点向策略可能适用于开发针对其他合成酶的抑制剂.
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