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The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1
TPA-inducible sequence 11b/butyrate response factor 1 (TIS11b/BRF1) belongs to the tristetraprolin (TTP) family of zinc-finger proteins, which bind to mRNAs containing AU-rich elements in their 3′-untranslated region and target them for degradation. Regulation of TTP family function through phosphor...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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The American Society for Cell Biology
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5170607/ https://www.ncbi.nlm.nih.gov/pubmed/27708140 http://dx.doi.org/10.1091/mbc.E16-06-0379 |
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author | Rataj, Felicitas Planel, Séverine Desroches-Castan, Agnès Le Douce, Juliette Lamribet, Khadija Denis, Josiane Feige, Jean-Jacques Cherradi, Nadia |
author_facet | Rataj, Felicitas Planel, Séverine Desroches-Castan, Agnès Le Douce, Juliette Lamribet, Khadija Denis, Josiane Feige, Jean-Jacques Cherradi, Nadia |
author_sort | Rataj, Felicitas |
collection | PubMed |
description | TPA-inducible sequence 11b/butyrate response factor 1 (TIS11b/BRF1) belongs to the tristetraprolin (TTP) family of zinc-finger proteins, which bind to mRNAs containing AU-rich elements in their 3′-untranslated region and target them for degradation. Regulation of TTP family function through phosphorylation by p38 MAP kinase and Akt/protein kinase B signaling pathways has been extensively studied. In contrast, the role of cAMP-dependent protein kinase (PKA) in the control of TTP family activity in mRNA decay remains largely unknown. Here we show that PKA activation induces TIS11b gene expression and protein phosphorylation. Site-directed mutagenesis combined with kinase assays and specific phosphosite immunodetection identified Ser-54 (S54) and Ser-334 (S334) as PKA target amino acids in vitro and in vivo. Phosphomimetic mutation of the C-terminal S334 markedly increased TIS11b half-life and, unexpectedly, enhanced TIS11b activity on mRNA decay. Examination of protein–protein interactions between TIS11b and components of the mRNA decay machinery revealed that mimicking phosphorylation at S334 enhances TIS11b interaction with the decapping coactivator Dcp1a, while preventing phosphorylation at S334 potentiates its interaction with the Ccr4-Not deadenylase complex subunit Cnot1. Collectively our findings establish for the first time that cAMP-elicited phosphorylation of TIS11b plays a key regulatory role in its mRNA decay-promoting function. |
format | Online Article Text |
id | pubmed-5170607 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | The American Society for Cell Biology |
record_format | MEDLINE/PubMed |
spelling | pubmed-51706072017-02-16 The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 Rataj, Felicitas Planel, Séverine Desroches-Castan, Agnès Le Douce, Juliette Lamribet, Khadija Denis, Josiane Feige, Jean-Jacques Cherradi, Nadia Mol Biol Cell Articles TPA-inducible sequence 11b/butyrate response factor 1 (TIS11b/BRF1) belongs to the tristetraprolin (TTP) family of zinc-finger proteins, which bind to mRNAs containing AU-rich elements in their 3′-untranslated region and target them for degradation. Regulation of TTP family function through phosphorylation by p38 MAP kinase and Akt/protein kinase B signaling pathways has been extensively studied. In contrast, the role of cAMP-dependent protein kinase (PKA) in the control of TTP family activity in mRNA decay remains largely unknown. Here we show that PKA activation induces TIS11b gene expression and protein phosphorylation. Site-directed mutagenesis combined with kinase assays and specific phosphosite immunodetection identified Ser-54 (S54) and Ser-334 (S334) as PKA target amino acids in vitro and in vivo. Phosphomimetic mutation of the C-terminal S334 markedly increased TIS11b half-life and, unexpectedly, enhanced TIS11b activity on mRNA decay. Examination of protein–protein interactions between TIS11b and components of the mRNA decay machinery revealed that mimicking phosphorylation at S334 enhances TIS11b interaction with the decapping coactivator Dcp1a, while preventing phosphorylation at S334 potentiates its interaction with the Ccr4-Not deadenylase complex subunit Cnot1. Collectively our findings establish for the first time that cAMP-elicited phosphorylation of TIS11b plays a key regulatory role in its mRNA decay-promoting function. The American Society for Cell Biology 2016-12-01 /pmc/articles/PMC5170607/ /pubmed/27708140 http://dx.doi.org/10.1091/mbc.E16-06-0379 Text en © 2016 Rataj, Planel, et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society for Cell Biology. |
spellingShingle | Articles Rataj, Felicitas Planel, Séverine Desroches-Castan, Agnès Le Douce, Juliette Lamribet, Khadija Denis, Josiane Feige, Jean-Jacques Cherradi, Nadia The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 |
title | The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 |
title_full | The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 |
title_fullStr | The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 |
title_full_unstemmed | The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 |
title_short | The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1 |
title_sort | camp pathway regulates mrna decay through phosphorylation of the rna-binding protein tis11b/brf1 |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5170607/ https://www.ncbi.nlm.nih.gov/pubmed/27708140 http://dx.doi.org/10.1091/mbc.E16-06-0379 |
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