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. 1990 Sep;64(9):4507–4515. doi: 10.1128/jvi.64.9.4507-4515.1990

Loss of a phosphorylated form of transcription factor CREB/ATF in poliovirus-infected cells.

S Kliewer 1, C Muchardt 1, R Gaynor 1, A Dasgupta 1
PMCID: PMC247921  PMID: 2166827

Abstract

Host cell RNA synthesis is inhibited by poliovirus infection. We have studied the mechanism of poliovirus-induced inhibition of RNA polymerase II-mediated transcription by using the adenovirus early region 3 (E3) promoter. In vitro transcription from the E3 promoter was severely inhibited in extracts prepared from poliovirus-infected HeLa cells. Four regions in the E3 promoter have been shown to serve as binding sites for cellular transcription factors. These regions contain binding sites for transcription factors NF-1 (site IV), AP-1 (site III), CREB/ATF (site II), and the TATA factor (site I). Binding to these four regions was not significantly altered by poliovirus infection as assayed by DNase I footprinting analysis; furthermore, gel retardation assays failed to reveal dramatic differences in the total amount of CREB/ATF-, AP-1-, and NF-1-binding activity present in mock- or poliovirus-infected cell extracts. Gel retardation assays, however, did reveal significant qualitative differences in the DNA-protein complexes formed with a CREB/ATF-binding site in extracts prepared from poliovirus-infected cells as compared to mock-infected cell extracts. Radioimmunoprecipitation reactions performed with antiserum against CREB/ATF revealed a severe reduction in a phosphorylated form of the protein present in poliovirus-infected cell extracts. However, in vitro kinase reactions demonstrated that mock- and poliovirus-infected cell extracts contained similar levels of CREB/ATF. Expression from the E3 promoter was shown to be activated by CREB/ATF in vivo; this induction was dependent upon the phosphorylation of CREB/ATF. Thus, we propose that poliovirus infection inhibits transcription from the E3 promoter, at least in part, through the dephosphorylation of CREB/ATF.

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