Alteration of water structure by peptide clusters revealed by neutron scattering in the small-angle region (below 1 Å(-1)).

Alteration of water structure by peptide clusters revealed by neutron scattering in the small-angle region (below 1 Å(-1)).
复制标题

小角度区域(低于 1 ×(-1))的中子散射揭示了肽簇对水结构的改变。

DOI:
10.1016/j.bpj.2012.08.010
复制
发表时间:
2012
影响因子:
3.4
通讯作者:
Daidone I
Daidone I
中科院分区:
生物学3区
文献类型:
--
作者:
Daidone I

文献摘要

参考文献

被引文献

相似文献

中子和x射线的溶液散射可以提供对生物分子折叠和结构具有重要意义的局部相互作用的直接信息。本文将中子散射实验与分子动力学模拟相结合,解释了一系列不同疏水性的二肽(GlyAla、GlyPro和AlaPro)在浓水溶液(溶质/水比1:20)中的散射信号,这些二肽在浓水溶液中形成大的偏析(多达50-60个氨基酸)。研究发现了两个主要结果:1)所谓的水环峰(2 Å−1)向较低q0的移动主要是由于水-肽和肽-肽相关性在1.32 Å−1区域的重叠,而不是由于簇的存在引起的水信号的移动;(2)在低q区(0.6 Å−1),由于溶质-溶质相关和由团簇形成引起的水结构变化,观察到一个正峰。特别是,发现水分子的氢键方向与暴露的疏水表面相切,这种效应随着肽疏水性的增加而增加。这项工作表明,生物分子的(疏水)水合作用的重要信息可以在非常小的角度区域获得。
Solution scattering of neutrons and x-rays can provide direct information on local interactions of importance for biomolecular folding and structure. Here, neutron scattering experiments are combined with molecular-dynamics simulation to interpret the scattering signal of a series of dipeptides with varying degrees of hydrophobicity (GlyAla, GlyPro, and AlaPro) in concentrated aqueous solution (1:20 solute/water ratio) in which the peptides form large segregates (up to 50–60 amino acids). Two main results are found: 1), the shift to lowerQof the so-called water-ring peak (2 Å−1) arises mainly from an overlap of water-peptide and peptide-peptide correlations in the region of 1.32 Å−1, rather than from a shift of the water signal induced by the presence of the clusters; and 2), in the low-Qregion (0.6 Å−1) a positive peak is observed originating from both the solute-solute correlations and changes in the water structure induced by the formation of the clusters. In particular, the water molecules are found to be more connected than in the bulk with hydrogen-bonding directions tangential to the exposed hydrophobic surfaces, and this effect increases with increasing peptide hydrophobicity. This work demonstrates that important information on the (hydrophobic) hydration of biomolecules can be obtained in the very-small-angle region.
DOI: 10.1529/biophysj.106.089185
发表时间: 2006-09-01
影响因子: 3.4
作者:
Hulme, E. C.;Soper, A. K.;Finney, J. L.
通讯作者: Finney, J. L.
DOI: 10.1002/anie.200802679
发表时间: 2008-01-01
影响因子: 16.6
作者:
McLain, Sylvia E.;Soper, Alan K.;Watts, Anthony
通讯作者: Watts, Anthony
随着溶质极性的增加,第一水化壳中的有序性和无序性均增加。
DOI: --
发表时间: 2011
影响因子: 8.6
作者:
A. Godec;Jeremy C. Smith;F. Merzel
通讯作者: F. Merzel
DOI: 10.1021/j100308a038
发表时间: 1987-11-19
影响因子: --
作者:
BERENDSEN, HJC;GRIGERA, JR;STRAATSMA, TP
通讯作者: STRAATSMA, TP
L-脯氨酸在水溶液中的结构和水合。
DOI: 10.1021/jp068340f
发表时间: 2007
期刊: The journal of physical chemistry. B
影响因子: --
作者:
S. McLain;A. Soper;A. Terry;A. Watts
通讯作者: A. Watts