c-Jun supports ribosomal RNA processing and nucleolar localization of RNA helicase DDX21
| Autor: | Tina Holm, Ülo Langel, David A. F. Gillespie, Yvonne Nymalm, Antoine Mialon, Benigno C. Valdez, Jukka Westermarck, Leni Mannermaa, Tiina A. Salminen, Henrik J. Johansson, Tim H. Holmström, Marko J. Kallio, Elizabeth J. Black |
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| Rok vydání: | 2008 |
| Předmět: |
AP-1 transcription
Nucleolus Proto-Oncogene Proteins c-jun 5.8S ribosomal RNA RRNA binding Biology Biochemistry Models Biological Gene Expression Regulation Enzymologic DEAD-box RNA Helicases Mice SDG 3 - Good Health and Well-being transcription factors Cell Line Tumor Transcriptional regulation Animals Humans RRNA processing protein expression Molecular Biology Regulation of gene expression DDX21 c-Jun RNA Cell Biology Fibroblasts RNA Helicase A proteins gene transcription Cell biology Phenotype Microscopy Fluorescence cell behavior RNA Ribosomal cancer cells gene expression Peptides Cell Nucleolus HeLa Cells |
| Zdroj: | Holmström, T H, Mialon, A, Kallio, M, Nymalm, Y, Mannermaa, L, Holm, T, Johansson, H, Black, E, Gillespie, D, Salminen, T A, Langel, U, Valdez, B & Westermarck, J 2008, ' C-jun supports ribosomal RNA processing and nucleolar localization of RNA helicase DDX21 ', Journal of Biological Chemistry, vol. 283, no. 11, pp. 7046-7053 . https://doi.org/10.1074/jbc.M709613200 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.M709613200 |
| Popis: | The molecular mechanisms by which the AP-1 transcription factor c-Jun exerts its biological functions are not clearly understood. In addition to its well established role in transcriptional regulation of gene expression, several reports have suggested that c-Jun may also regulate cell behavior by non-transcriptional mechanisms. Here, we report that small interfering RNA-mediated depletion of c-Jun from mammalian cells results in inhibition of 28 S and 18 S rRNA accumulation. Moreover, we show that c-Jun depletion results in partial translocation of RNA helicase DDX21, implicated in rRNA processing, from the nucleolus to the nucleoplasm. We demonstrate that DDX21 translocation is rescued by exogenous c-Jun expression and that c-Jun depletion inhibits rRNA binding of DDX21. Furthermore, the direct interaction between c-Jun and DDX21 regulates nucleolar localization of DDX21. These results demonstrate that in addition to its transcriptional effects, c-Jun regulates rRNA processing and nucleolar compartmentalization of the rRNA processing protein DDX21. Thus, our results demonstrate a nucleolar mechanism through which c-Jun can regulate cell behavior. Moreover, these results suggest that the phenotypes observed previously in c-Jun-depleted mouse models and cell lines could be partly due to the effects of c-Jun on rRNA processing. |
| Databáze: | OpenAIRE |
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