Abstract
Incubation of synthetic Man\1-4GlcNAcβ-OMe, GalNAcβ1-4GlcNAcβ-OMe, Glcβ1-4GlcNAcβ-OMe, and GlcNAcβ1-4GlcNacβ-OMe with CMP-Neu5Ac and rat liver Galβ1-4GlcNAc α(2-6)-sialyltransferase resulted in the formation of Neu5Acα2-6Manβ1-4GlcNAcβ-OMe, Neu5Acα2-6GalNAcβ1-4GlcNAcβ-OMe, Neu5Acα2-6Glcβ1-4GlcNAcβ-OMe and Neu5Acα2-6GlcNAcβ1-4GlcNAcβ-OMe, respectively. Under conditions which led to quantitative conversion of Galβ1-4GlcNAcβ-OEt into Neu5Acα2-6Galβ1-4GlcNAcβ-OEt, the aforementioned products were obtained in yields of 4%, 48%, 16% and 8%, respectively. HPLC on Partisil 10 SAX was used to isolate the various sialyltrisaccharides, and identification was carried out using 1- and 2-dimensional 500-MHz1H-NMR spectroscopy.
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Abbreviations
- 2D:
-
2-dimensional
- CMP:
-
cytidine 5′-monophosphate
- CMP-Neu5Ac:
-
cytidine 5′-monophospho-β-N-acetylneuraminic acid
- COSY:
-
correlation spectroscopy
- DQF:
-
double quantum filtered
- HOHAHA:
-
homonuclear Hartmann-Hahn
- MLEV:
-
composite pulse devised by M. Levitt
- Neu5Ac:
-
N-acetylneuraminic acid
- Neu5Ac2en:
-
2-deoxy-2,3-didehydro-N-acetylneuraminic acid
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Hokke, C.H., van der Ven, J.G.M., Kamerling, J.P. et al. Action of rat liver Galβ1-4GlcNAc α(2-6)-sialyltransferase on Manβ1-4GlcNAcβ-OMe, GalNAcβ1-4GlcNAcβ-OMe, Glcβ1-4GlcNAcβ-OMe and GlcNAcβ1-4GlcNAcβ-OMe as synthetic substrates. Glycoconjugate J 10, 82–90 (1993). https://doi.org/10.1007/BF00731191
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DOI: https://doi.org/10.1007/BF00731191