Abstract
The thin-layer chromatographic (TLC) pattern of gangliosides of rat thymocytes showed a profile characterized by the occurrence of a predominant ganglioside which did not correspond to any reference gangliosides of rat brain. The ganglioside was isolated from rat thymus, and characterized by compositional analysis, methylation analysis, sialidase treatment, negative-ion fast atom bombardment (FAB) mass spectrometry, and proton NMR spectroscopy. The structure was elucidated to be NeuGc alpha 2-8NeuGc alpha 2-3Gal beta 1-3GalNac beta 1-4Gal beta 1-4Glc beta 1-1Cer. This is the major ganglioside of rat thymus lymphoid cells and is one of the GM1b-derived gangliosides, GD1c, having two N-glycolylneuraminic acids. This is the first report on the occurrence of GD1c in normal animal cells.
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