DNA damage-induced BARD1 phosphorylation is critical for the inhibition of messenger RNA processing by BRCA1/BARD1 complex
| Autor: | Danae Fonseca, Murat A. Cevher, Frida E. Kleiman, Sean Bong Lee, Alissa Parmelee, Hongjie Li, Ho-Shik Kim |
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| Rok vydání: | 2006 |
| Předmět: |
Cancer Research
DNA damage DNA repair Ubiquitin-Protein Ligases Molecular Sequence Data Bone Neoplasms Biology BRCA1-BARD1 complex Transfection Phosphorylation cascade Phosphatidylinositol 3-Kinases Cell Line Tumor Humans Amino Acid Sequence RNA Messenger Phosphorylation Protein kinase A Conserved Sequence Osteosarcoma Kinase BRCA1 Protein Tumor Suppressor Proteins G2-M DNA damage checkpoint Molecular biology Oncology DNA Damage |
| Zdroj: | Cancer research. 66(9) |
| ISSN: | 0008-5472 |
| Popis: | BRCA1-associated RING domain protein BARD1, along with its heterodimeric partner BRCA1, plays important roles in cellular response to DNA damage. Immediate cellular response to genotoxic stress is mediated by a family of phosphoinositide 3-kinase–related protein kinases, such as ataxia-telangiectasia mutated (ATM), ATM and Rad3-related, and DNA-dependent protein kinase. ATM-mediated phosphorylation of BRCA1 enhances the DNA damage checkpoint functions of BRCA1, but how BARD1 is regulated during DNA damage signaling has not been examined. Here, we report that BARD1 undergoes phosphorylation upon ionizing radiation or UV radiation and identify Thr714 as the in vivo BARD1 phosphorylation site. Importantly, DNA damage functions of BARD1 (i.e., inhibition of pre-mRNA polyadenylation and degradation of RNA polymerase II) are abrogated in T714A and T734A mutants. Our findings suggest that phosphorylation of BARD1 is critical for the DNA damage functions of the BRCA1/BARD1 complex. (Cancer Res 2006; 66(9): 4561-5) |
| Databáze: | OpenAIRE |
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