A domain of murine retrovirus surface protein gp70 mediates cell fusion, as shown in a novel SC-1 cell fusion system.
Virus-induced cell fusion of the fusion-from-without type was observed in SC-1 cells infected with Moloney murine leukemia virus when grown in NIH 3T3 cells. Replication-competent virus mutants with altered surface protein gp70 were examined. Fusion mutations were found in the proline-rich region of gp70. They acted on a step after binding and before or during endocytosis. The fusion mutants had an altered gp70 isomer pattern, presumably caused by different glycosylation. Other mutants with deleted glycans were analyzed, and some which also showed defective fusion were found. The interrelationship of the proline-rich region, glycosylation, and fusion is discussed.
Andersen
K B
KB
Department of Biology, Danish Royal School of Pharmacy, Copenhagen.
D016475:3T3 Cells; D000209:Acute-Phase Proteins / Q000502:physiology*; D000818:Animals; D000914:Antibodies, Viral / Q000494:pharmacology; D002459:Cell Fusion / Q000187:drug effects / Q000502:physiology*; D004252:DNA Mutational Analysis; D004705:Endocytosis; D006023:Glycoproteins / Q000502:physiology; D006031:Glycosylation; D051379:Mice; D008979:Moloney murine leukemia virus / Q000502:physiology*; D009154:Mutation; D011134:Polysaccharides / Q000502:physiology; D015682:Retroviridae Proteins, Oncogenic / Q000276:immunology / Q000502:physiology*; D014759:Viral Envelope Proteins / Q000276:immunology / Q000502:physiology*
D000209:Acute-Phase Proteins; D000914:Antibodies, Viral; D006023:Glycoproteins; D011134:Polysaccharides; D015682:Retroviridae Proteins, Oncogenic; D014759:Viral Envelope Proteins