Keap1-independent regulation of Nrf2 activity by protein acetylation and a BET bromodomain protein
Mammalian BET proteins comprise a family of bromodomain-containing epigenetic regulators with complex functions in chromatin organization and gene regulation. We identified the sole member of the BET protein family in Drosophila, Fs(1)h, as an inhibitor of the stress responsive transcription factor...
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| Main Authors: | , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
May 27, 2016
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| In: |
PLoS Genetics
Year: 2016, Volume: 12, Issue: 5 |
| ISSN: | 1553-7404 |
| DOI: | 10.1371/journal.pgen.1006072 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1371/journal.pgen.1006072 Verlag, kostenfrei, Volltext: https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1006072 
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| Author Notes: | Nirmalya Chatterjee, Min Tian, Kerstin Spirohn, Michael Boutros, Dirk Bohmann |
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| 520 | |a Mammalian BET proteins comprise a family of bromodomain-containing epigenetic regulators with complex functions in chromatin organization and gene regulation. We identified the sole member of the BET protein family in Drosophila, Fs(1)h, as an inhibitor of the stress responsive transcription factor CncC, the fly ortholog of Nrf2. Fs(1)h physically interacts with CncC in a manner that requires the function of its bromodomains and the acetylation of CncC. Treatment of cultured Drosophila cells or adult flies with fs(1)h RNAi or with the BET protein inhibitor JQ1 de-represses CncC transcriptional activity and engages protective gene expression programs. The mechanism by which Fs(1)h inhibits CncC function is distinct from the canonical mechanism that stimulates Nrf2 function by abrogating Keap1-dependent proteasomal degradation. Consistent with the independent modes of CncC regulation by Keap1 and Fs(1)h, combinations of drugs that can specifically target these pathways cause a strong synergistic and specific activation of protective CncC- dependent gene expression and boosts oxidative stress resistance. This synergism might be exploitable for the design of combinatorial therapies to target diseases associated with oxidative stress or inflammation. | ||
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| 650 | 4 | |a Drosophila melanogaster | |
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| 650 | 4 | |a Oxidative stress | |
| 650 | 4 | |a RNA interference | |
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