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- W1994985612 abstract "The disaccharide arabinobiose (5-O -α-L-arabinofuranosyl-α-L-arabinofuranose) constitutes the basic repeating structures found in such polysaccharides as arabinan or in the side chains of the hairy regions of pectins. The conformational behavior of aqueous arabinobiose has been investigated by high resolution nmr and computerized molecular modeling. The complete conformational analysis of the, disaccharide has been achieved with the MM3 molecular mechanics methods using the flexible residue method. In this study, both the puckering of the arabinofuranose, rings and the orientations about the glycosidic torsion angles ϕ, ψ, and ω; were considered. Some insights into conformational transitions were obtained through molecular dynamics simulation using the CHARMM force field. In parallel, transient nuclear Overhauser effects at 400.13 MHz and long-range vicinal homonuclear and heteronuclear coupling constants have been measured. The theoretical nmr data were calculated taking into account all accessible conformations and using averaging methods for both slow and fast internal motions models. The data do not support a single conformational model, and only conformational averaging yields the excellent agreement between the observed and simulated parameters. Within the potential energy surfaces computed for the disaccharide, several low energy conformers can be identified. When these conformations are extrapolated to regular polysaccharide structures, they generate chains of arabinan displaying right- and left-handed chirality and a wide range of repeating units per turn of helix. © 1994 John Wiley & Sons, Inc." @default.
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- W1994985612 date "1994-10-01" @default.
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- W1994985612 title "Modeling of arabinofuranose and arabinan, II. Nmr and Conformational analysis of arabinobiose and arabinan" @default.
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- W1994985612 doi "https://doi.org/10.1002/bip.360341014" @default.
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