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题名: Uncovering the Sensitivity of Amide-II Vibration to Peptide-Ion Interactions
作者: Zhao, Juan1, 2; Wang, Jianping1, 2, 3
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2016-09-15
卷: 120, 期:36, 页:9590-9598
收录类别: SCI
英文摘要: In this work, linear infrared spectroscopy was used to examine the effect of salt on the amide-II mode in a model beta-peptide (N-ethylpropionamide, NEPA) in its deuterated form, to reveal the sensitivity of this mode in reporting peptide-ion interactions. In comparison to the case of NEPA in water, the amide-II spectra mainly showed a red-shifted component in four typical saline solutions (NaCl, CaCl2, MgCl2, and AlCl3) examined in this work. Our results suggest that highly populated hydrated ion complexes under high salt concentration conditions destroy the hydration layer of the model peptide and result in mostly a salting-out state of the peptide. Molecular dynamics simulations suggest that the hydrated cation mainly interacts with the peptide backbone on the amide C=O side, whereas the hydrated anion interacts on the amide N-H side. As the amide-II mode is mainly a combination of the C-N stretching and N-H in-plane-bending vibrations, this mode is advantageous in being responsive to ionic interaction from both the C=O and N-H sides. Such a dual sensitivity should be very useful in probing the breaking and/or formation of the interamide hydrogen bond between the C=O and N-H groups, which is a very important interaction involved in the solvation and stabilization, as well as folding/unfolding of proteins.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35317
Appears in Collections:分子反应动力学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Mol React Dynam Lab, Inst Chem, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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