title: Simian virus 40 tumor-specific proteins: subcellular distribution and metabolic stability in HeLa cells infected with nondefective adenovirus type 2-simian virus 40 hybrid viruses.
abstract: HeLa cells infected with adenovirus type 2 (Ad2)-simian virus 40 (SV40) hybrid viruses produce several SV40-specific proteins. These include the previously reported 28,000-dalton protein of Ad2+ND1, and 42,000- and 56,000-dalton proteins of Ad2+ND2, the 56,000-dalton protein of Ad2+ND4, and the 42,000-dalton protein of Ad2+ND5. In this report, we extend the list of SV40-specific proteins induced by Ad2+ND4 to include proteins of apparent molecular weights of 28,000 42,000, 60,000, 64,000, 72,000, 74,000, and a doublet of 95,000. Cell fractionation studies demonstrate that the SV40-specific proteins are detectable in the nuclear, cytoplasmic, and plasma membrane fractions. By pulse-chase and cell fractionation experiments, three classes of SV40-specific proteins can be distinguished with regard to metabolic stability: (i) unstable in the cytoplasmic but stable in the nuclear and plasma membrane fractions; (ii) stable in the nuclear, cytoplasmic, and plasma membrane fractions; and (iii) unstable in all subcellular fractions. Immunoprecipitation of infected cell extracts demonstrates that most of the above proteins share antigenic determinants with proteins expressed in hamsters bearing SV40-induced tumors. Only the 42,000-dalton protein of Ad2+ND5 is not immunoprecipitable.
mesh_terms: D000260:Adenoviruses, Human / Q000254:growth & development*; D000956:Antigens, Viral / Q000032:analysis; D002462:Cell Membrane / Q000032:analysis; D002467:Cell Nucleus / Q000032:analysis; D003593:Cytoplasm / Q000032:analysis; D000939:Epitopes; D006367:HeLa Cells; D010641:Phenotype; D013539:Simian virus 40 / Q000032:analysis / Q000254:growth & development* / Q000276:immunology; D014764:Viral Proteins / Q000032:analysis / Q000276:immunology
chemical_list: D000956:Antigens, Viral; D000939:Epitopes; D014764:Viral Proteins