双酸盐与法纳西二酸盐合成酶的结合是以力对抗力驱动的结合
Fenglin Yin1, Rong Cao, Amanda Goddard
1Department of Biophysics, University of Illinois at Urbana-Champaign, 607 South Mathews Avenue, Urbana, Illinois 61801, USA.
Journal of the American Chemical Society
|March 16, 2006
概括
我们使用异热定位热量计研究了六种双酸盐如何与法纳西二酸盐合成酶 (FPPS) 结合. 对一些化合物而言,结合是以力驱动的,对其他化合物而言是以力驱动的,影响FPPS抑制和潜在的药物开发.
科学领域:
- 生物化学 生物化学
- 酶动力学 酶动力学
- 药物发现 药物发现
背景情况:
- 法内赛二酸盐合成酶 (FPPS) 是异oprenoid生物合成中的一个关键酶.
- 双酸盐是一种具有重要的治疗应用的药物类别,包括癌症免疫疗法和抗寄生虫化疗.
- 了解双酸盐与FPPS的结合机制对于开发更强效和选择性抑制剂至关重要.
研究的目的:
- 为了研究六种双酸盐对Trypanosoma brucei FPPS的热力学结合参数.
- 为了将结合热力学与酶抑制数据相关联.
- 为了阐明双酸盐-FPPS相互作用的分子基础.
主要方法:
- 使用异热定位热量计 (ITC) 来测量双酸盐与FPPS的结合.
- 放射化学测定用于确定FPPS抑制常数.
- 热力学参数 (ΔH, ΔS, ΔG) 从ITC数据计算出来.
主要成果:
- 发现双酸盐与FPPS结合是由或驱动的,这取决于具体的化合物和pH值.
- 在pH值从7.4增加到8.5.5时,佐勒多酸结合呈现出从驱动到驱动的切换.
- 结合自由能量 (ΔG) 与FPPS抑制有很强的相关性 (R2 = 0.85).
结论:
- 结合模式 (由和驱动) 受双酸盐侧链特性和pH的影响.
- 带电的侧链通过溶解和增加水,有助于通过力驱动的结合.
- 在活性部位的基本侧链的质子化增强了某些双酸盐的活性,突出了它们作为FPPS抑制剂的潜力.
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