结核菌1-脱氧-d-西卢5-酸盐合成酶DXPS的Apo结构:抑制剂设计的动力学和影响
Victor O Gawriljuk1, Alaa Alhayek2, Anna K H Hirsch3
1Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands.
Biochemical and biophysical research communications
|January 10, 2025
概括
结核菌1-脱氧-d-硫-5-酸盐合成酶 (DXPS) 在其Apo形式的结构显示出独特的活性位点灵活性. 这种灵活性是由于缺乏硫胺二酸盐 (ThDP) 而导致的,这对于理解潜在的药物点至关重要.
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:
- 1-deoxy-d-xylulose-5-phosphate合成酶 (DXPS) 对于通过MEP途径进行细菌异oprenoid生物合成至关重要.
- 在人类中缺少MEP途径,使细菌DXPS成为潜在的抗菌药物标.
- 硫胺二酸盐 (ThDP) 是DXPS活性的一个关键辅因子.
研究的目的:
- 为了确定Mycobacterium结核病DXPS的Apo结构.
- 为了研究去除辅助因子 (ThDP和金属) 的结构和动态后果.
- 了解辅助因子的缺失如何影响酶的催化核和潜在的抑制剂结合.
主要方法:
- 通过X射线晶体学,获得了Mycobacterium tuberculosis DXPS.的apo结构.
- 使用浸泡方法从预制晶体中去除硫胺二酸盐 (ThDP) 和金属.
- 对同类DXPS结构进行了比较结构分析.
主要成果:
- Apo DXPS 结构揭示了在活性位点附近缺乏电子密度的独特区域.
- 缺少辅助因子导致特定酶区域的灵活性增加.
- 催化活性和ThDP结合的关键残留物保持了它们的位置,保持了催化核心的完整性.
结论:
- 硫胺二酸盐 (ThDP) 在维护DXPS的结构稳定性方面发挥着至关重要的作用.
- 在阿波状态中观察到的动态结构变化可能会影响向辅因子结合部位的抑制剂的疗效.
- 了解DXPS的apostate动态对于设计新型抗菌剂至关重要.
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