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- W1793237622 abstract "Previously constructed Swiss mouse 3T3 fibroblasts producing polyomavirus large T antigen after addition of dexamethasone were used to study the transcriptional activation by the viral protein of five genes coding for enzymes involved in DNA synthesis and precursor production, namely, dihydrofolate reductase, thymidine kinase, thymidylate synthase, DNA polymerase alpha, and proliferating-cell nuclear antigen. It was found that all these genes, whose expression is stimulated at the G1/S boundary of the cell cycle after growth stimulation by serum addition, are coordinately trans activated when T antigen is induced in cells previously growth arrested by serum withdrawal. Cell lines carrying the information for a mutant form of large T antigen, in which a glutamic acid residue in the binding site for the retinoblastoma protein was changed into aspartic acid, were constructed to test the involvement of an interaction of T antigen with the retinoblastoma protein in this reaction. It was found that the mutated T protein is incapable of stimulating transcription of any one of the genes. The promoter of three of the genes (dihydrofolate reductase, thymidine kinase, and DNA polymerase alpha) unequivocally carries binding sites for transcription factor E2F, suggesting that complexes forming with this growth- and cell cycle-regulating transcription factor are the targets for T antigen. Although there is so far no evidence that thymidylate synthase and proliferating cell nuclear antigen are regulated via E2F, our data indicate that the retinoblastoma protein still is involved in the control of these genes. mRNA for E2F itself increases in amount at the G1/S border in serum-stimulated cells but not during polyomavirus T antigen-induced transcriptional activation of DNA synthesis enzymes in arrested cells." @default.
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- W1793237622 date "1994-03-01" @default.
- W1793237622 modified "2023-09-26" @default.
- W1793237622 title "Coordinated trans activation of DNA synthesis- and precursor-producing enzymes by polyomavirus large T antigen through interaction with the retinoblastoma protein." @default.
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- W1793237622 doi "https://doi.org/10.1128/mcb.14.3.1886" @default.
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