环键 影响乙胆及其类型的自组合,是蛋白质结合中的辅助相互作用
Andrea Daolio1, Miriam Calabrese1, Andrea Pizzi1
1NFMLab, Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, Via L. Mancinelli 7, I-20131, Milano, Italy.
Chemistry (Weinheim an der Bergstrasse, Germany)
|July 22, 2024
概括
乙胆及其类型中的三甲基团与核友形成四键 (TtBs). 这些TtB解释了这些化合物如何与蛋白质结合并产生生物效应.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 计算化学计算化学
背景情况:
- 三甲基 (-N+(CH3) 3) 组是乙胆 (ACh) 和其衍生物中的关键药.
- 这些化合物作为选择性ACH激动剂或对抗剂在人体治疗中至关重要.
研究的目的:
- 为了研究涉及 -N+(CH3) 3组在 ACh衍生物中的相互作用的性质.
- 确定这些相互作用是否可以被归类为四键 (TtBs).
- 探索这些相互作用在蛋白质-连接体结合和生物活性中的作用.
主要方法:
- 四个ACh衍生物的X射线晶体学.
- 蛋白质数据库 (PDB) 结构的分析.
- 分子中的原子量子理论 (QTAIM).
- 非共价相互作用 (NCI) 图. 非共价相互作用 (NCI) 图.
- 自然债券轨道 (NBO) 分析.
主要成果:
- X射线结构揭示了 -N+(CH3) 3组的甲基碳和单独拥有对原子之间的短线接触.
- 这些接触物呈现出与四键 (TtBs) 一致的几何特征.
- 对PDB数据的分析表明类似的-N+-C⋅⋅⋅核接触会影响ACH与蛋白质结合.
- 计算分析证实了这些-N+-C⋅⋅⋅核友接触的吸引力,将它们归类为TtBs.
结论:
- 短,有吸引力的接触涉及 -N+(CH3) 3部分的甲基组被确定为四键 (TtB).
- 这些TtBs代表了一种新的相互作用机制,有助于将ACh类化合物与它们的蛋白标结合.
- TtBs为含有-N+(CH3) 3药的化合物的生物和药理性质背后的分子相互作用提供了新的视角.
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