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• W2125026993 abstract "We have analyzed T antigens produced by a set of simian virus 40 (SV40) A gene deletion mutants for ATPase activity and for binding to the SV40 origin of DNA replication. Virus stocks of nonviable SV40 A gene deletion mutants were established in SV40-transformed monkey COS cells. Mutant T antigens were produced in mutant virus-infected CV1 cells. The structures of the mutant T antigens were characterized by immunoprecipitation with monoclonal antibodies directed against distinct regions of the T-antigen molecule. T antigens in crude extracts prepared from cells infected with 10 different mutants were immobilized on polyacrylamide beads with monoclonal antibodies, quantified by Coomassie blue staining, and then assayed directly for T antigen-specific ATPase activity and for binding to the SV40 origin of DNA replication. Our results indicate that the T antigen coding sequences required for origin binding map between 0.54 and 0.35 map units on the SV40 genome. In contrast, sequences closer to the C terminus of T antigen (between 0.24 and 0.20 map units) are required for ATPase activity. The presence of the ATPase activity correlated closely with the ability of the mutant viruses to replicate and to transform nonpermissive cells. The origin binding activity was retained, however, by three mutants that lacked these two functions, indicating that this activity is not sufficient to support either cellular transformation or viral replication. Neither the ATPase activity nor the origin binding activity correlated with the ability of the mutant DNA to activate silent rRNA genes or host cell DNA synthesis." @default.
• W2125026993 created "2016-06-24" @default.
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• W2125026993 date "1983-02-01" @default.
• W2125026993 modified "2023-09-27" @default.
• W2125026993 title "Biochemical activities of T-antigen proteins encoded by simian virus 40 A gene deletion mutants." @default.
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• W2125026993 doi "https://doi.org/10.1128/mcb.3.2.220" @default.
• W2125026993 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/368525" @default.
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