Deciphering environment effects in peptide bond solvation dynamics by experiment and theory.

Deciphering environment effects in peptide bond solvation dynamics by experiment and theory.
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通过实验和理论解读肽键溶剂化动力学中的环境影响

DOI:
10.1039/c7cp03992a
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发表时间:
2017
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
R. Mitric
R. Mitric
中科院分区:
--
文献类型:
--
作者:
M. Wohlgenuth;M. Miyazaki;K. Tsukuda;M. Weiler;O. Dopfer;M. Fujii;R. Mitric

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Most proteins work in aqueous solution and the interaction with water strongly affects their structure and function. However, experimentally the motion of a specific single water molecule is difficult to trace by conventional methods, because they average over the heterogeneous solvation structure of bulk water surrounding the protein. Here, we provide a detailed atomistic picture of the water rearrangement dynamics around the –CONH– peptide linkage in the two model systems formanilide and acetanilide, which simply differ by the presence of a methyl group at the peptide linkage. The combination of picosecond pump–probe time-resolved infrared spectroscopy and molecular dynamics simulations demonstrates that the solvation dynamics at the molecular level is strongly influenced by this small structural difference. The effective timescales for solvent migration triggered by ionization are mainly controlled by the efficiency of the kinetic energy redistribution rather than the shape of the potential energy surface. This approach provides a fundamental understanding of protein hydration and may help to design functional molecules in solution with tailored properties.
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