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- W2037651043 abstract "The vaccinia virus (VV) replicates robustly and alters the progression of the cell cycle via an unknown mechanism. Herein, we provide evidence for the existence of a unique VV infection-induced cell cycle control mechanism. The regulation is correlated with the inactivation of p53 and Rb, which are associated with the RNA polymerase III transcription factor B (TFIIIB) subunits, TBP and Brf1 respectively. VV infection induced the expression of Mdm2 and its translocation into the nucleus, thereby resulting in a disruption of p53. VV also stimulated the expression of TFIIIB and TFIIIC, and consequently induced tRNA synthesis. On the other hand, the total level of Rb was not significantly influenced, but the level of hypo-phosphorylated Rb was enhanced, partially due to the VV-induced downregulation of cyclin-dependent kinases 4 and 6. However, the hypo-phosphorylated Rb appeared to be largely sequestered into a complex with Brf1, which resulted in the blockage of Rb function to repress E2F1 transactivation, thereby leading to a moderately higher proportion of cells in the S and G(2) phases. Conversely, the enforced expression of exogenous Rb restored the normally observed cell cycle patterns. Overall, these controls may contribute to the efficient replication of the virus in rapidly growing cells." @default.
- W2037651043 created "2016-06-24" @default.
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- W2037651043 date "2008-03-01" @default.
- W2037651043 modified "2023-10-05" @default.
- W2037651043 title "Vaccinia virus-mediated cell cycle alteration involves inactivation of tumour suppressors associated with Brf1 and TBP" @default.
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- W2037651043 doi "https://doi.org/10.1111/j.1462-5822.2007.01047.x" @default.
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