Isolation of three novel cholinergic neuron-specific gangliosides from bovine brain and theirin vitro syntheses
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Abstract
In the present study, three extremely minor but novel Chol-1 antigens, termed X1, X2, and X3 have been isolated from bovine brain gangliosides. Based on the results of sialidase degradation, TLC-immunostaining with anti-Chol-1 antibody and fast atom bombardment mass spectrometry, their chemical structures were identified as: The yields of GM1α, GD1aα, and GT1bα, were approximately 150, 20, and 10 µg, respectively, from 10 g of the bovine brain ganglioside mixture. In conjunction with our previous observations, all gangliosides with anti-Chol-1 reactivity were found to contain a common sialyl α2–6N-acetylgalactosamine residue, indicating that this unique sialyl linkage is the specific antigenic determinant. We subsequently examined the biosyntheses of the three novel Chol-1 gangliosides using rat liver Golgi fraction as an enzyme source. The results showed that GM1α, GD1aα, and GT1bα were synthesized from asialo-GM1, GM1a, and GD1b, respectively, by the action of a GalNAc α2-6sialyltransferase.
$$\begin{gathered} III^6 NeuAc--GgOse4Cer (X1:GM1\alpha ) \hfill \\ III^6 NeuAc,II^3 NeuAc--GgOse4Cer (X2:GT1a\alpha ) \hfill \\ III^6 NeuAc,II^3 NeuAc--NeuGc--GgOse4Cer (X3:GT1b\alpha ) \hfill \\ \end{gathered} $$
Keywords
ganglioside cholinergic neuron ganglioside biosynthesis sialyltransferasePreview
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