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http://dx.doi.org/10.5012/bkcs.2004.25.2.198

Hydrogen Bonds in GlcNAc( β1,3)Gal( β)OMe in DMSO Studied by NMR Spectroscopy and Molecular Dynamics Simulations  

Shim, Gyu-Chang (Department of Chemistry, Konkuk University)
Shin, Jae-Min (IDRTech Inc.)
Kim, Yang-Mee (Department of Chemistry, Konkuk University)
Publication Information
Bulletin of the Korean Chemical Society / v.25, no.2, 2004 , pp. 198-202 More about this Journal
Abstract
Hydrogen bond is an important factor in the structures of carbohydrates. Because of great strength, short range, and strong angular dependence, hydrogen bonding is an important factor stabilizing the structure of carbohydrate. In this study, conformational properties and the hydrogen bonds in GlcNAc( ${\beta}$1,3)Gal(${\beta}$)OMe in DMSO are investigated through NMR spectroscopy and molecular dynamics simulation. Lowest energy structure in the adiabatic energy map was utilized as an initial structure for the molecular dynamics simulations in DMSO. NOEs, temperature coefficients, SIMPLE NMR data, and molecular dynamics simulations proved that there is a strong intramolecular hydrogen bond between O7' and HO3' in GlcNAc( ${\beta}$1,3)Gal(${\beta}$)OMe in DMSO. In aqueous solution, water molecule makes intermolecular hydrogen bonds with the disaccharides and there was no intramolecular hydrogen bonds in water. Since DMSO molecule is too big to be inserted deep into GlcNAc(${\beta}$1,3)Gal(${\beta}$)OMe, DMSO can not make strong intermolecular hydrogen bonding with carbohydrate and increases the ability of O7' in GlcNAc(${\beta}$1,3)Gal(${\beta}$)OMe to participate in intramolecular hydrogen bonding. Molecular dynamics simulation in conjunction with NMR experiments proves to be efficient way to investigate the intramolecular hydrogen bonding existed in carbohydrate.
Keywords
GlcNAc( ${\beta}$1,3)Gal( ${\beta}$)OMe; NMR spectroscopy; SIMPLE NMR; Molecular dynamics simulation; Hydrogen bond;
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