Rous sarcoma virus-transformed baby hamster kidney cells express higher levels of asparagine-linked tri- and tetraantennary glycopeptides containing [GlcNAc-beta (1,6)Man-alpha (1,6)Man] and poly-N-acetyllactosamine sequences than baby hamster kidney cells.
The alterations in complex-type N-linked oligosaccharides that can occur when an animal cell line is transformed by two dissimilar viruses were examined by comparing the N-linked oligosaccharides of baby hamster kidney (BHK) cells, metabolically radiolabeled with [2-3H]mannose, to the same class of oligosaccharides from BHK cells separately transformed by Rous sarcoma virus (RS-BHK), an RNA retrovirus, and polyoma virus (PY-BHK), a DNA papovavirus. Based on experiments that utilized serial lectin affinity chromatography, glycosidase digestions, and methylation analyses, both RS-BHK and PY-BHK cells demonstrated a significant increase in the relative amounts of tri- and tetraantennary complex-type N-linked oligosaccharides containing the branching sequence, [GlcNAc-beta(1,6)Man-alpha(1,6)Man], compared to the nontransformed BHK cells. In addition, almost all of the poly-N-acetyllactosamine sequence, [GlcNAc-beta(1,3)-Gal-beta(1,4)], was expressed on the tri- and tetraantennary N-linked oligosaccharides from BHK and RS-BHK cells that contain the sequence, [GlcNAc-beta(1,6)Man-beta(1,6)Man]. The increase in the relative amounts of this latter sequence in the transformed cells, therefore, most likely results in an increase in the amount of poly-N-acetyllactosamine sequence on the N-linked glycopeptides of these cells. The analysis of the degree of sialylation of the complex-type N-linked oligosaccharides from BHK and RS-BHK cells by ion exchange chromatography revealed no apparent differences, and in both of these cell types approximately 3% of the glycopeptide fraction radiolabeled with mannose was recovered in a highly negatively charged fraction that was identified by keratanase digestion to be keratan sulfate.
D000117:Acetylglucosamine / Q000032:analysis; D000606:Amino Sugars / Q000032:analysis; D000818:Animals; D001216:Asparagine / Q000032:analysis*; D001358:Avian Sarcoma Viruses / Q000235:genetics*; D002240:Carbohydrate Sequence; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D006224:Cricetinae; D006020:Glycopeptides / Q000032:analysis*; D007668:Kidney; D008358:Mannose / Q000032:analysis; D009844:Oligosaccharides / Q000032:analysis
D000606:Amino Sugars; D006020:Glycopeptides; D009844:Oligosaccharides; C000458:N-acetyllactosamine; D001216:Asparagine; D008358:Mannose; D000117:Acetylglucosamine