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- W2066753098 abstract "A study of the competition between intra- and intermolecular hydrogen bonds and its influence on the stability of the Cys-Asn-Ser tripeptide in aqueous solution was performed by using the averaged solvent electrostatic potential from molecular dynamics method (ASEP/MD). The model combines a DFT-B3LYP/6-311+G(d) quantum treatment in the description of the solute molecule with NVT molecular dynamics simulations in the description of the solvent. In gas phase, the most stable structure adopts a C5 conformation. Somewhat higher in energy are found the PPII and C7eq structures. In solution, the stability order of the different conformers is reversed: the PPII structure becomes the most stable, and the C5 structure is strongly destabilized. The conformational equilibrium is shifted toward conformations in which the intramolecular hydrogen bonds (IHB) have been substituted with intermolecular hydrogen bonds with the water molecules. The solvent stabilizes extended structures without IHBs that are not stable in vacuum. The effect of the protonation state on the conformational equilibrium was also analyzed." @default.
- W2066753098 created "2016-06-24" @default.
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- W2066753098 date "2010-06-22" @default.
- W2066753098 modified "2023-10-16" @default.
- W2066753098 title "Theoretical Study of the Competition between Intramolecular Hydrogen Bonds and Solvation in the Cys-Asn-Ser Tripeptide" @default.
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- W2066753098 doi "https://doi.org/10.1021/jp1035162" @default.
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