对人类骨上的双酸盐的静态和动态结构的NMR研究:一个分子模型
Sujoy Mukherjee1, Yongcheng Song, Eric Oldfield
1Center for Biophysics and Computational Biology, 607 South Mathews Avenue, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
Journal of the American Chemical Society
|January 5, 2008
概括
双酸盐药物不可逆地与骨矿物质结合,取代了正酸盐. 这些针对骨的药物的分子结构和运动是使用先进的核磁共振光谱技术阐明的.
科学领域:
- 生物材料科学 生物材料科学
- 化学物理 化学物理
- 药理学 药理学是指药理学的学科.
背景情况:
- 双酸盐是治疗骨疾病的关键药物.
- 了解它们与骨矿物质的精确结合机制对于优化治疗疗效至关重要.
- 核磁共振 (NMR) 光谱学为分子相互作用与生物矩阵提供了原子的洞察力.
研究的目的:
- 研究各种双酸盐药物与人类骨的结合相互作用.
- 为了确定双酸盐在骨表面的结合亲和力,形状和动态.
- 使用多核核核磁共振 (NMR) 阐明双酸盐与骨相互作用的分子基础.
主要方法:
- 多维和多核固态NMR光谱 (2H, 13C, 15N, 31P NMR).
- 转移回声双共振 (TEDOR) 实验用于构造分析.
- 交叉偏振和放松测量以评估结合强度和动态.
- 异热结合研究以量化结合亲和力.
主要成果:
- 双酸盐组以旋转方式与骨矿物质结合,取代了正酸盐.
- 帕米德罗纳酸结合遵循一个Langmuir-like同热法,吉布斯自由能量为-4.3 kcal/mol.
- 双酸盐采用特定的形状 (例如,帕米德酸盐的 gauche [N-C(1) ]),并表现出有限的侧链运动.
- 结合强度有所不同:由于伊米达的质子化,佐莱德酸盐结合强,而由于中性质的皮里丁侧链,瑞塞德酸盐结合弱.
- 帕米德罗酸的氨基末端靠近骨表面,侧链在酸盐位点之间跳跃.
结论:
- 双酸盐通过其酸盐组表现出强烈的,特定的结合于骨矿物质.
- 药物结构,包括侧链质子和形状,决定了结合亲和力和动态.
- 核磁共振光谱为在分子层面上表征药物与骨相互作用提供了一个强大的平台.
- 帕米德罗纳酸结合的详细模型表明,骨酸位之间存在动态跳跃.
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