化学异质表面的水介导的非添加性相互作用:非离子极性群和疏水性相互作用
Chenxuan Wang1,2, Chi-Kuen Derek Ma1, Hongseung Yeon1
1Department of Chemical and Biological Engineering, University of Wisconsin-Madison , 1415 Engineering Drive, Madison, Wisconsin 53706, United States.
Journal of the American Chemical Society
|November 14, 2017
概括
与初级氨基组相比,初级氨基组显著减弱了疏水相互作用. 这项研究量化了β-的这些效应,影响了生物材料设计.
科学领域:
- 生物化学
- 材料科学
- 化学物理
背景情况:
- 了解极性群体对疏水相互作用的影响对于设计功能生物材料至关重要.
- 全球两性β-为研究这些效应提供了一个可调的平台.
研究的目的:
- 研究主要氨基和主要胺基如何影响GAβ-中的邻近非极性域的疏水相互作用.
- 量化由β3-同质素 (K) 和β3-同质素 (Q) 残留物介导的疏水相互作用的差异.
主要方法:
- 设计和合成稳定的GAβ-序列与非极和极侧链的控制安排.
- 在水和甲醇溶液中使用原子力显微镜 (AFM) 测量化学力.
- 在固体支混合单层上进行AFM研究,以探测与终端氨基或氨基基组的相互作用.
主要成果:
- 当初级胺基组 (Q侧链) 取代初级胺基组 (K侧链) 时,疏水性粘合物相互作用显著减弱.
- 在pH值10.5时,GA- KKK的相互作用为0. 61±0. 04nN,GA- QKK为0. 54±0. 01nN,GA- QQK为0±0. 01nN.
- 在混合单层的AFM研究中观察到类似的趋势,证实了极性群体特征的影响.
结论:
- 靠近的非离子极群,特别是初级氨基和胺,对邻近的疏水相互作用产生强烈的影响.
- 极群的身份是疏水相互作用调节的重要决定因素.
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