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High-pressure liquid chromatography was used to identify the sialo-oligosaccharide products obtained after sialylation of [14C]Gal-GalNAc-protein in vitro by an ovine submaxillary-gland microsomal fraction. Among other products, two isomeric trisaccharides could be identified. NeuAc alpha 2 leads to 3Gal beta 1 leads to 3GalNAcol and Gal beta 1 leads to 3-(NeuAc alpha 2 leads to 6)GalNAcol respectively, indicating that ovine submaxillary gland contains two sialyltransferases acting on mucin-type acceptors, a beta-galactoside alpha 2 leads to 3 sialyltransferase and a N-acetylgalactosaminide alpha 2 leads to 6 sialyltransferase. This conclusion was fully supported by methylation analysis of the two trisaccharide products.

biochemical journal

Specificity of ovine submaxillary-gland sialyltransferases. Application of high-pressure liquid chromatography in the identification of sialo-oligosaccharide products.