聚电解质未分离氨酸和通用氨酸逆转剂之间的相互作用
Hemant K Saini1, A Louise Creagh1, Chanel C La2
1Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada.
The journal of physical chemistry. B
|December 12, 2024
概括
全球肝素逆转剂7 (UHRA-7) 通过电荷-电荷相互作用有效中和未分离肝素 (UFH). 这项研究使用热量计,核磁共振和模拟来阐明结合机制,证实其作为氨酸抗剂的潜力.
科学领域:
- 生物材料科学 生物材料科学
- 化学生物学 化学生物学
- 聚合物化学 聚合物化学
背景情况:
- 未分离的肝素 (UFH) 是一种广泛使用的抗凝剂,但其作用可能很难逆转.
- 一种通用肝素逆转剂 (UHRA-7) 已经开发出来,其特点是具有充电Me-TREN组和mPEG屏蔽的多糖醇核心.
- UHRA-7已经证明了生物相容性和有效性,可以中和肝素.
研究的目的:
- 调查未分离氨酸 (UFH) 和通用氨酸逆转剂7 (UHRA-7) 之间的相互作用机制.
- 为了确定结合常数 (Kb) 和热力学贡献 (对流/水释放) 的UFH-UHRA-7相互作用.
- 根据实验和模拟数据,提出UFH-UHRA-7结合的详细模型.
主要方法:
- 异热定位热量计 (ITC) 用于在不同温度和盐度下测量结合常量.
- 分析使用理论模型来剖析 counterion 和水释放的贡献.
- 核磁共振 (NMR) 光谱和分子动力学 (MD) 模拟以支持相互作用建模.
主要成果:
- 对UFH-UHRA-7相互作用的结合常数 (Kb) 在一系列温度 (278323 K) 和NaCl度 (0.060.20 M) 中确定.
- 分析揭示了 counterion 和水释放在驱动结合过程中的重要作用.
- 提出了一个模型,其中结合主要由负电荷的UFH和UHRA-7上的正电荷的Me-TREN/mPEG群体之间的静电相互作用介导.
结论:
- UHRA-7有效地与UFH结合,主要是通过电荷-电荷相互作用.
- 相互作用是热力学驱动的 counterion 和水释放,由ITC 和理论建模阐明.
- 核磁共振和MD模拟提供了结构性见解,支持UHRA-7作为氨酸对抗剂的拟议结合模型.
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