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
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发表时间:
2012
影响因子:
3.4
通讯作者:
Daidone I
中科院分区:
文献类型:
--
作者:
Daidone I
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.
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影响因子:
3.4
作者:
Hulme, E. C.;Soper, A. K.;Finney, J. L.
通讯作者:
Finney, J. L.
影响因子:
16.6
作者:
McLain, Sylvia E.;Soper, Alan K.;Watts, Anthony
通讯作者:
Watts, Anthony
影响因子:
8.6
作者:
A. Godec;Jeremy C. Smith;F. Merzel
通讯作者:
F. Merzel
影响因子:
--
作者:
BERENDSEN, HJC;GRIGERA, JR;STRAATSMA, TP
通讯作者:
STRAATSMA, TP
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