通过连续注射异热定位热量计直接确定高亲和度结合常量
Ji Woong Chang1,2, Yanyu Mu1, Antonios Armaou1,3,4
1Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
The journal of physical chemistry. B
|December 12, 2023
概括
连续注射方法异热定位热量计 (CIA-ITC) 准确地测量了受体结合的亚纳米分离常数 (KD). 这种无标签方法确定了desthiobiotin-avidin KD为6.5 pM,这对于其他技术来说是一项具有挑战性的壮举.
科学领域:
- 生物物理化学 生物物理化学
- 生物化学 生物化学
- 分析化学 分析化学
背景情况:
- 异热定位热量计 (ITC) 对于确定热力学约束参数 (ΔG, ΔH, ΔS) 至关重要.
- 标准增量注入方法ITC (IIA-ITC) 努力准确测量亚纳米分离常量 (KD).
- 之前的工作引入了持续注入方法ITC (CIA-ITC) 在现场热力学估计.
研究的目的:
- 展示一种无标签和无表面修改的CIA-ITC方法.
- 准确确定具有亚纳米KD的配体的完整结合热力学.
- 建立获得真平衡离异常数而不需要位移定位的标准.
主要方法:
- 使用连续注射方法的异热定位热量计 (CIA-ITC).
- 使用无标签和无表面修改的实验条件.
- 确定了德西奥比 (DTB) - 艾维丁相互作用的结合热力学.
主要成果:
- 成功测量了destiobiotin-avidin解离常数 (KD) 的6.5 pM.
- 实现了亚纳米KD的测量,这在IIA-ITC或SPR.无法实现.
- 为准确的平衡KD确定提供了连接体/受体度和流量标准.
结论:
- 无标签,无表面的CIA-ITC有效地确定了高亲和度相互作用的完全结合热力学.
- CIA-ITC克服了IIA-ITC和SPR在测量亚纳米分离常数方面的局限性.
- 建立的标准确保了平衡分离常数的可靠确定.
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