Hydration of l-glycylvaline and l-glycylvalylglycine zwitterions: Structural and vibrational studies using DFT method
Solvent effects on the structural and vibrational features of l-glycylvaline (L-GV) and l-glycylvalylglycine (L-GVG) in zwitterionic forms have been performed by means of DFT method. Relaxed potential energy surface scans (RPES) performed at B3LYP/6–31++G(d) level were used to map the reaction coord...
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Published in | Journal of molecular graphics & modelling Vol. 88; pp. 194 - 202 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier Inc
01.05.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Solvent effects on the structural and vibrational features of l-glycylvaline (L-GV) and l-glycylvalylglycine (L-GVG) in zwitterionic forms have been performed by means of DFT method. Relaxed potential energy surface scans (RPES) performed at B3LYP/6–31++G(d) level were used to map the reaction coordinate surfaces and to identify the geometries corresponding to the minima energy. Explicit solvation model, where L-GV and L-GVG are respectively surrounded by 9 and 11 water molecules interacting with H-donor and H-acceptor sites, as well as the different hybrid solvation models of solvation (explicit/COSMO, explicit/PCM and explicit/CPCM) allowed to analyze the hydration effects. Those number of water molecules are sufficient to fully hydrate carboxyl(CtOO-), amine (NtH3+) and amide (NH, C=O) groups. Harmonic vibrational modes calculated after geometry optimization on each solvated complex are performed at B3LYP/6–31++g(d) and PBE0/6–31++g(d) methods and a post-processing treatment enable us to assign the vibrational modes of LGV and L-GVG. The frequencies of the assigned modes obtained using B3LYP in explicit/COSMO are in good agreement with available IR and Raman values than those found in both explicit/PCM and explicit/CPCM which proved to be very close.
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1093-3263 1873-4243 |
DOI: | 10.1016/j.jmgm.2019.01.012 |