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- W2068287710 abstract "The gene encoding the Ras-related GTPase RhoB-specific is immediate-early inducible by genotoxic treatments. Regulation of transcriptional activation of rhoB is still unclear. Here we show that cells lacking either p53 or c-Fos are not different from wild-type cells with respect to the level of rhoB induction upon UV irradiation, indicating that these transcription factors are not crucial for stimulation of rhoB mRNA expression. Extracts from UV-irradiated and non-irradiated cells revealed similar DNA-binding activities to a 0.17 kb rhoB promoter fragment harboring the functional element(s) necessary for stimulation of rhoB by UV light. By means of immunoprecipitation we found that an ATF-2-specific antibody co-precipitates the (32)P-labeled 0.17 kb rhoB fragment, whereas an anti-AP1 antibody did not. Since no consensus sequence for binding of ATF-2 is present within the rhoB promoter, ATF-2 is likely to be associated with another factor that binds to the minimal promoter. Deletion analysis and site-directed mutagenesis of the 0.17 kb rhoB fragment revealed a CCAAT box to be an essential requirement for stimulation of rhoB by UV light and methyl methanesulfonate. Moreover, immunoprecipitation experiments showed that the CCAAT-binding factor NF-YA is complexed with ATF-2. Overall, the data strongly indicate that transcriptional activation of the rhoB gene by genotoxic stress is regulated via a CCAAT box and that interaction of CCAAT-binding factor and ATF-2 triggers the stress-inducible expression of rhoB." @default.
- W2068287710 created "2016-06-24" @default.
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- W2068287710 date "2001-02-01" @default.
- W2068287710 modified "2023-10-16" @default.
- W2068287710 title "Transcriptional activation of the small GTPase gene rhoB by genotoxic stress is regulated via a CCAAT element" @default.
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- W2068287710 doi "https://doi.org/10.1093/nar/29.3.792" @default.
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