库库尔比特[7]uril介导的丁二分化:探索结构和结合机制
Ewelina Zaorska1, Maura Malinska1
1Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland.
Chemistry (Weinheim an der Bergstrasse, Germany)
|December 6, 2023
概括
黄瓜[7]uril (CB7) 和黄瓜[8]uril (CB8) 显示对histidine的结合较弱. 然而,它们与含有西斯提丁的类化合物形成稳定的复合体,这表明它们在生物标记和净化中的应用.
科学领域:
- 超分子化学 超分子化学
- 生物物理化学 生物物理化学
- 化学生物学 化学生物学
背景情况:
- 黄瓜[7,8]urils (CB7,CB8) 是宏循环宿主,以结合疏水性氨基酸和N端而闻名.
- 尽管His在生物系统中的重要性,但对histidine (His) 与cucurbiturils的相互作用不太了解.
研究的目的:
- 调查与CB7和CB8结合的histidine和含有histidine的的结合亲和和和复杂化行为.
- 探索使用库库尔比图里尔在基于希斯蒂丁的生物应用中的潜力.
主要方法:
- 进行X射线衍射实验,以阐明海斯蒂丁在CB7腔内的结合方式.
- 异热定位热量测量 (ITC) 用于量化cucurbiturils与含有histidine的 dipeptides 的结合亲缘关系 (平衡解离常数).
主要成果:
- X射线衍射揭示了两个histidine部分和CB7之间的π-π和键网络,诱导了显著的pKa转移 (ΔpKa=-4).
- 希斯蒂丁单独显示对CB7和CB8的结合较弱.
- ITC证明了CB7和CB8与C终端His二的微分子结合 afinities,与N终端His二的millimolar afinities形成鲜明对比.
- 在His-Gly-Gly三和CB7之间观察到一个2:1复合体.
结论:
- 黄瓜表现出特定的结合偏好对于含有胺的,特别是那些在C端的His.
- 观察到的pKa转移和复杂形成突出显示了CB7和CB8作为识别胺的工具的潜力.
- 氨酸和含有氨酸的标签,与cucurbiturils结合,为各种生物应用提供了有前途的途径,包括蛋白质净化和传感.
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