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Gangliosides with a short carbohydrate chain: II 3 (NeuAc) 2 ‐LacCer, II 3 (NeuAc) 2 ‐GgOse 3 Cer, II 3 (NeuAc) 3 ‐LacCer, II 3 NeuAc‐LacCer, and II 3 NeuAC‐GgOse 3 Cer, were found to be predominant in the brain of 8 species of cartilaginous fish, elasmobranches. N ‐acetylneuraminic acid was the only sialic acid found in these gangliosides, the N ‐glycolyl derivative being practically absent. 4‐Sphingenine was shown to be the predominant sphingoid in elasmobranch brain gangliosides. The sequential enzymatic hydrolysis of II 3 (NeuAc) 2 ‐LacCer from shark and ray brain by acylneur‐aminyl hydrolase (EC 3.2.1.18) and β‐D‐galactoside‐galactohydrolase (EC 3.2.1.23), as well as permethylation studies, provide further evidence for the following structure of this major elasmobranch brain ganglioside:
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Аврова et al. (1979) studied this question.
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