Celio X. C. Santos, Anne D. Hafstad, Matteo Beretta, Min Zhang, Chris Molenaar, Jola Kopec, Dina Fotinou, Thomas V. Murray, Andrew M. Cobb, Daniel Martin, Maira Zeh Silva, Narayana Anilkumar, Katrin Schröder, Catherine M. Shanahan, Alison C. Brewer, Ralf Brandes, Eric Blanc, Maddy Parsons, Vsevelod Belousov, Richard Cammack, Robert C. Hider, Roberto A. Steiner, Ajay M. Shah
- Phosphorylation of translation initiation factor 2α (eIF2α) attenuates global protein synthesis but enhances translation of activating transcription factor 4 (ATF4) and is a crucial evolutionarily conserved adaptive pathway during cellular stresses. The serine–threonine protein phosphatase 1 (PP1) deactivates this pathway whereas prolonging eIF2α phosphorylation enhances cell survival. Here, we show that the reactive oxygen species‐generating NADPH oxidase‐4 (Nox4) is induced downstream of ATF4, binds to a PP1‐targeting subunit GADD34 at the endoplasmic reticulum, and inhibits PP1 activity to increase eIF2α phosphorylation and ATF4 levels. Other PP1 targets distant from the endoplasmic reticulum are unaffected, indicating a spatially confined inhibition of the phosphatase. PP1 inhibition involves metal center oxidation rather than the thiol oxidation that underlies redox inhibition of protein tyrosine phosphatases. We show that this Nox4‐regulated pathway robustly enhances cell survival and has a physiologic role in heart ischemia–reperfusion and acute kidney injury. This work uncovers a novel redox signaling pathway, involving Nox4–GADD34 interaction and a targeted oxidative inactivation of the PP1 metal center, that sustains eIF2α phosphorylation to protect tissues under stress.
MetadatenVerfasserangaben: | Celio X. C. Santos, Anne D. Hafstad, Matteo Beretta, Min Zhang, Chris Molenaar, Jola Kopec, Dina Fotinou, Thomas V. Murray, Andrew M. Cobb, Daniel MartinORCiD, Maira Zeh Silva, Narayana Anilkumar, Katrin SchröderORCiDGND, Catherine M. Shanahan, Alison C. Brewer, Ralf BrandesORCiDGND, Eric Blanc, Maddy Parsons, Vsevelod Belousov, Richard Cammack, Robert C. Hider, Roberto A. Steiner, Ajay M. ShahORCiD |
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URN: | urn:nbn:de:hebis:30:3-425131 |
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DOI: | https://doi.org/10.15252/embj.201592394 |
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ISSN: | 1460-2075 |
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Titel des übergeordneten Werkes (Deutsch): | The EMBO Journal |
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Verlag: | EMBO Press |
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Verlagsort: | Heidelberg |
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Dokumentart: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Veröffentlichung (online): | 19.12.2016 |
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Datum der Erstveröffentlichung: | 07.01.2016 |
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Veröffentlichende Institution: | Universitätsbibliothek Johann Christian Senckenberg |
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Datum der Freischaltung: | 21.12.2016 |
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Jahrgang: | 35 |
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Ausgabe / Heft: | 3 |
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Seitenzahl: | 16 |
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Erste Seite: | 319 |
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Letzte Seite: | 334 |
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Bemerkung: | This is an open access article under the terms of the Creative Commons Attribution 4.0 License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
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HeBIS-PPN: | 423894730 |
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Institute: | Medizin / Medizin |
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DDC-Klassifikation: | 6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit |
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Sammlungen: | Universitätspublikationen |
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Lizenz (Deutsch): | Creative Commons - Namensnennung 4.0 |
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