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Expression of a differentiation antigen and poly-N-acetyllactosaminyl O-glycans directed by a cloned core 2 beta-1,6-N-acetylglucosaminyltransferase. 1994

M F Bierhuizen, and K Maemura, and M Fukuda
Glycobiology Program, La Jolla Cancer Research Foundation, California 92037.

Chinese hamster ovary (CHO) cells do not contain detectable amounts of core 2 beta-1,6-N-acetylglucosaminyltransferase, C2GnT, and thus lack various modifications in their branched O-linked oligosaccharides. In the present study, the O-linked oligosaccharides and the occurrence of a differentiation antigen were analyzed in CHO cells stably transfected with cDNA encoding human leukosialin alone (CHO-leu) or with cDNAs encoding both leukosialin and C2GnT (CHO-leu.C2GnT). The analysis of O-glycans, released from [3H]glucosamine-labeled cells, revealed that CHO-leu cells synthesize O-glycans with a Gal beta 1-->3GalNAc backbone, whereas CHO-leu.C2GnT cells synthesize in addition O-glycans with a Gal beta 1-->3(Gal beta 1-->4GlcNAc beta 1-->6)GalNAc backbone. Moreover, CHO-leu.C2GnT cells express poly-N-acetyllactosaminyl extensions from the GlcNAc beta 1-->6 branch in O-glycans, while CHO-leu cells express no detectable amount of poly-N-acetyllactosaminyl O-glycans. It was also demonstrated that leukosialin in CHO-leu.C2GnT cells is recognized by the T305 monoclonal antibody, while the same antibody did not react at all with CHO-leu cells. In addition, the transient expression cloning scheme using the T305 monoclonal antibody as a selectin marker and COS-1 cells, which endogenously express C2GnT as recipient cells, resulted in the isolation of cDNA encoding leukosialin. These results indicate that C2GnT determines the expression of poly-N-acetyllactosamines in O-glycans and together with leukosialin, an onco-differentiation antigen recognized by the T305 antibody.

UI MeSH Term Description Entries
D007158 Immunologic Techniques Techniques used to demonstrate or measure an immune response, and to identify or measure antigens using antibodies. Antibody Dissociation,Immunologic Technic,Immunologic Technics,Immunologic Technique,Immunological Technics,Immunological Techniques,Technic, Immunologic,Technics, Immunologic,Technique, Immunologic,Techniques, Immunologic,Antibody Dissociations,Dissociation, Antibody,Dissociations, Antibody,Immunological Technic,Immunological Technique,Technic, Immunological,Technics, Immunological,Technique, Immunological,Techniques, Immunological
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D011134 Polysaccharides Long chain polymeric CARBOHYDRATES composed of MONOSACCHARIDES linked by glycosidic bonds. Glycan,Glycans,Polysaccharide
D011499 Protein Processing, Post-Translational Any of various enzymatically catalyzed post-translational modifications of PEPTIDES or PROTEINS in the cell of origin. These modifications include carboxylation; HYDROXYLATION; ACETYLATION; PHOSPHORYLATION; METHYLATION; GLYCOSYLATION; ubiquitination; oxidation; proteolysis; and crosslinking and result in changes in molecular weight and electrophoretic motility. Amino Acid Modification, Post-Translational,Post-Translational Modification,Post-Translational Protein Modification,Posttranslational Modification,Protein Modification, Post-Translational,Amino Acid Modification, Posttranslational,Post-Translational Amino Acid Modification,Post-Translational Modifications,Post-Translational Protein Processing,Posttranslational Amino Acid Modification,Posttranslational Modifications,Posttranslational Protein Processing,Protein Processing, Post Translational,Protein Processing, Posttranslational,Amino Acid Modification, Post Translational,Modification, Post-Translational,Modification, Post-Translational Protein,Modification, Posttranslational,Modifications, Post-Translational,Modifications, Post-Translational Protein,Modifications, Posttranslational,Post Translational Amino Acid Modification,Post Translational Modification,Post Translational Modifications,Post Translational Protein Modification,Post Translational Protein Processing,Post-Translational Protein Modifications,Processing, Post-Translational Protein,Processing, Posttranslational Protein,Protein Modification, Post Translational,Protein Modifications, Post-Translational
D002240 Carbohydrate Sequence The sequence of carbohydrates within POLYSACCHARIDES; GLYCOPROTEINS; and GLYCOLIPIDS. Carbohydrate Sequences,Sequence, Carbohydrate,Sequences, Carbohydrate
D006023 Glycoproteins Conjugated protein-carbohydrate compounds including MUCINS; mucoid, and AMYLOID glycoproteins. C-Glycosylated Proteins,Glycosylated Protein,Glycosylated Proteins,N-Glycosylated Proteins,O-Glycosylated Proteins,Glycoprotein,Neoglycoproteins,Protein, Glycosylated,Proteins, C-Glycosylated,Proteins, Glycosylated,Proteins, N-Glycosylated,Proteins, O-Glycosylated
D006031 Glycosylation The synthetic chemistry reaction or enzymatic reaction of adding carbohydrate or glycosyl groups. GLYCOSYLTRANSFERASES carry out the enzymatic glycosylation reactions. The spontaneous, non-enzymatic attachment of reducing sugars to free amino groups in proteins, lipids, or nucleic acids is called GLYCATION (see MAILLARD REACTION). Protein Glycosylation,Glycosylation, Protein
D006224 Cricetinae A subfamily in the family MURIDAE, comprising the hamsters. Four of the more common genera are Cricetus, CRICETULUS; MESOCRICETUS; and PHODOPUS. Cricetus,Hamsters,Hamster
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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