Glycobiology, 2000, Vol. 10, No. 11 1147-1156
© 2000 Oxford University Press
MINI REVIEW |
Conformation and dynamics of heparin and heparan sulfate
National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Potters Bar, Hertfordshire EN6 3QG, UK
Abstract
The glycosaminoglycans heparin and heparan sulfate contain similar structural units in varying proportions providing considerable diversity in sequence and biological function. Both compounds are alternating copolymers of glucosamine with both iduronate- and glucuronate-containing sequences bearing N-sulfate, N-acetyl, and O-sulfate substitution. Protein recognition of these structurally-diverse compounds depends upon substitution pattern, overall molecular shape, and on internal mobility. In this review particular attention is paid to the dynamic aspects of heparin/heparan sulfate conformation. The iduronate residue possesses an unusually flexible pyranose ring conformation. This extra source of internal mobility creates special problems in rationalization of experimental data for these compounds. We present herein the solution-state NMR parameters, fiber diffraction data, crystallographic data, and molecular modeling methods employed in the investigation of heparin and heparan sulfate. Heparin is a useful model compound for the sulfated, protein-binding regions of heparan sulfate. The literature contains a number of solution and solid-state studies of heparin oligo- and polysaccharides for both isolated heparin species and those bound to protein receptors. These studies indicate a diversity of iduronate ring conformations, but a limited range of glycosidic linkage geometries in the repeating disaccharides. In this sense, heparin exhibits a well-defined overall shape within which iduronate ring forms can freely interconvert. Recent work suggests that computational modeling could potentially identify heparin binding sites on protein surfaces.
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