The solution conformations of heparin and de-N-sulphated, re-N-acetylated heparin have been determined by a combination of n.m.r. spectroscopic and molecular-modelling techniques. The 1H- and 13C-n.m.r. spectra of these polysaccharides have been assigned ...
The solution conformations of heparin and de-N-sulphated, re-N-acetylated heparin have been determined by a combination of n.m.r. spectroscopic and molecular-modelling techniques. The 1H- and 13C-n.m.r. spectra of these polysaccharides have been assigned. Observed 1H-1H nuclear Overhauser enhancements (n.O.e.s) have been simulated using the program NOEMOL [Forster, Jones and Mulloy (1989) J. Mol. Graph. 7, 196-201] for molecular models derived from conformational-energy calculations; correlation times for the simulations were chosen to fit experimentally determined 13C spin-lattice relaxation times. In order to achieve good agreement between calculated and observed 1H-1H n.O.e.s it was necessary to assume that the reorientational motion of the polysaccharide molecules was not isotropic, but was that of a symmetric top. The resulting model of heparin in solution is similar to that determined in the fibrous state by X-ray-diffraction techniques [Nieduszynski, Gardner and Atkins (1977) Am. Chem. Soc. Symp. Ser. 48, 73-80].
Related Citations:
The Effect of Variation of Substitution on the Solution Conformation of Heparin: A Spectroscopic and Molecular Modelling Study Mulloy, B., Forster, M.J., Jones, C., Drake, A.F., Johnson, E.A., Davies, D.B. (1994) Carbohydr Res 255: 1
Noemol: Integrated Molecular Graphics and the Simulation of Nuclear Overhauser Effects in NMR Spectroscopy Forster, M.J., Jones, C., Mulloy, B. (1989) J Mol Graph 7: 196
Organizational Affiliation:
National Institute for Biological Standards and Control, South Mimms, Potters Bar, Herts, U.K.
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