title: Detection of B-tropic endogenous type-C virus in viral isolates originating from induced BALB/K-3T3 cells.
abstract: Isoelectric focusing (IEF) analysis of class I endogenous type-C virus induced by iododeoxyuridine treatment of BALB/K-3T3 cells revealed, in addition to the major variant of the p30 polypeptide, which has an isoelectric point of 6.1 (pI 6.1 isop30), a minor isop30 with a pI of 5.6. This value was also found for a prototype BALB/c B-tropic endogenous virus isolate. The pI 5.6 isop30 of the N-tropic isolate was amplified by long-term virus replication in B-type mouse cells, and comparative IEF and XC-assay data suggest that it may correspond to a B-tropic subpopulation which has not yet been detected in vitro in mouse cells of embryonic origin.
mesh_terms: D000818:Animals; D002460:Cell Line; D007525:Isoelectric Focusing; D051379:Mice; D008807:Mice, Inbred BALB C; D008907:Mink; D012190:Retroviridae / Q000032:analysis / Q000254:growth & development* / Q000302:isolation & purification; D014764:Viral Proteins / Q000032:analysis*; D014775:Virus Activation
chemical_list: D014764:Viral Proteins