Solution Structures of Chemoenzymatically Synthesized Heparin and Its Precursors
- Zhang, Z. 2
- McCallum, S.A. 2
- Xie, J. 2
- Nieto, L. 1
- Corzana, F. 4
- Jiménez-Barbero, J. 1
- Chen, M. 3
- Liu, J. 3
- Linhardt, R.J. 2
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1
Centro de Investigaciones Biológicas
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2
Rensselaer Polytechnic Institute
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3
University of North Carolina System
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4
Universidad de La Rioja
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ISSN: 0002-7863
Año de publicación: 2008
Volumen: 130
Número: 39
Páginas: 12998-13007
Tipo: Artículo
beta Ver similares en nube de resultadosOtras publicaciones en: Journal of the American Chemical Society
Resumen
We report the first chemoenzymatic synthesis of the stable isotope-enriched heparin from a uniformly labeled [13C,15N]N- acetylheparosan (-GlcA(1,4)GlcNAc-) prepared from E. coli K5. Glycosaminoglycan (GAG) precursors and heparin were formed from N-acetylheparosan by the following steps: chemical N-deacetylation and N-sulfonation leading to N-sulfoheparosan (-GlcA(1,4)GlcNS-); enzyme-catalyzed C5-epimerization and 2-O-sulfonation leading to undersulfated heparin (-IdoA2S(1,4)GlcNS-); enzymatic 6-O-sulfonation leading to the heparin backbone (-IdoA2S(1,4)GlcNS6S-); and selective enzymatic 3-O-sulfonation leading to the anticoagulant heparin, containing the GlcNS6S3S residue. Heteronuclear, multidimensional nuclear magnetic resonance spectroscopy was employed to analyze the chemical composition and solution structure of [13C,15N]N-acetylheparosan, precursors, and heparin. Isotopic enrichment was found to provide well-resolved 13C spectra with the high sensitivity required for conformational studies of these biomolecules. Stable isotope-labeled heparin was indistinguishable from heparin derived from animal tissues and is a novel reagent for studying the interaction of heparin with proteins. © 2008 American Chemical Society.