Wiwaporn Soodsawang. Conformational analysis and flexibility of glycosidic bonds based on melezitose structure by NMR, molecular dynamics, and monte carlo simulations. Master's Degree(Applied Analytical and Inorganic Chemistry). Mahidol University. : Mahidol University, 2008.
Conformational analysis and flexibility of glycosidic bonds based on melezitose structure by NMR, molecular dynamics, and monte carlo simulations
Abstract:
Melezitose, [O-α-D-glucopyranosyl-(1→2)-O-β -D-fructofuranosyl-(3→1)-α-Dglucopyranoside]
is an oligosaccharide consisting of two glycosidic linkages in the
molecule. The three dimensional structures of melezitose in solution were studied by
using experimental NMR measurements and unrestrained molecular dynamics (MD)
simulations in explicit water at 300 K, using the SANDER module of AMBER7
program. The energy minimizations, simulated annealing procedures and MD
simulations were carried out by AMBER force field. The results were shown with the
fluctuation of trajectories resulting in the major and minor conformations of
melezitose, rapidly exchanging in solution.
The conformational flexibility of 10 trisaccharide models based on melezitose
structure were carried out by unrestrained 10 ns MD and Monte Carlo (MC)
simulations in water at 300 K. The results of 10 ns unrestrained MD simulations in
explicit water showed that the solvent has little influence on the conformation of the
entire sugar ring molecule, but it has strong influence on the conformational flexibility
of the glycosidic linkages in the molecule.