移动活性位点在IMP脱酶抑制剂结合中的作用
Xingyou Wang1, Masha M Rosenberg2, Youngchang Kim3,4
1Department of Chemistry, Brandeis University, Waltham, Massachusetts 02454, United States.
ACS infectious diseases
|January 29, 2025
概括
氨酸5'-单酸脱酶 (IMPDH) 中的一个移动活性位点影响了抗生素抑制剂的功效. 突变显示,皮接触并不总是与有利的相互作用相关,这影响了对细菌感染的药物开发.
科学领域:
- 生物化学 生物化学
- 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:
- 氨酸5'-单酸脱酶 (IMPDH) 是细菌氨酸核酸生物合成中的关键酶,也是有前途的抗生素标.
- 针对NAD+位点的现有的IMPDH抑制剂在细菌物种中显示出可变的亲和力,而这种亲和力并不能完全由晶体结构解释.
研究的目的:
- 为了研究移动活性位点在细菌IMPDH中的作用,作为抑制剂功率的决定因素.
- 了解不同细菌IMPDH酶的各种抑制剂 afinities 的结构基础.
主要方法:
- 对25种酶抑制剂晶体结构的分析,其中包括10种新结构.
- 和转移差异 NMR 实验.
- 菌人类IMPDH (Leu413到Phe或Ala) 的局部定向突变发生.
- 稳定状态和稳定状态的动力实验.
主要成果:
- 移动活性部位被确定为抑制剂功率的潜在决定因素.
- 片残留物Leu413显示结构状况变化和与抑制剂接触.
- 将Leu413转变为Ala增强了大多数抑制剂的效力,而不考虑观察到的晶体接触.
- 动力实验表明,与非共价和共价酶抑制剂复合体具有相似的片相互作用.
结论:
- 酶活性部位的灵活性和动态是抑制剂结合亲和力的关键决定因素.
- 在晶体结构中观察到的直接接触并不总是等同于有利的相互作用.
- 移动区域,即使结构不佳,也应该在药物设计中考虑针对IMPDH.
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