ROS-mediated inhibition of S-nitrosoglutathione reductase contributes to the activation of anti-oxidative mechanisms
Nitric oxide (NO) has emerged as a signaling molecule in plants being involved in diverse physiological processes like germination, root growth, stomata closing and response to biotic and abiotic stress. S-nitrosoglutathione (GSNO) as a biological NO donor has a very important function in NO signali...
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| Hauptverfasser: | , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
10 November 2016
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| In: |
Frontiers in plant science
Year: 2016, Jahrgang: 7, Pages: 1-17 |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2016.01669 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3389/fpls.2016.01669 Verlag, lizenzpflichtig, Volltext: https://www.frontiersin.org/articles/10.3389/fpls.2016.01669/full 
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| Verfasserangaben: | Izabella Kovacs, Christian Holzmeister, Markus Wirtz, Arie Geerlof, Thomas Fröhlich, Gaby Römling, Gitto T. Kuruthukulangarakoola, Eric Linster, Rüdiger Hell, Georg J. Arnold, Jörg Durner and Christian Lindermayr |
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| 245 | 1 | 0 | |a ROS-mediated inhibition of S-nitrosoglutathione reductase contributes to the activation of anti-oxidative mechanisms |c Izabella Kovacs, Christian Holzmeister, Markus Wirtz, Arie Geerlof, Thomas Fröhlich, Gaby Römling, Gitto T. Kuruthukulangarakoola, Eric Linster, Rüdiger Hell, Georg J. Arnold, Jörg Durner and Christian Lindermayr |
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| 520 | |a Nitric oxide (NO) has emerged as a signaling molecule in plants being involved in diverse physiological processes like germination, root growth, stomata closing and response to biotic and abiotic stress. S-nitrosoglutathione (GSNO) as a biological NO donor has a very important function in NO signaling since it can transfer its NO moiety to other proteins (trans-nitrosylation). Such trans-nitrosylation reactions are equilibrium reactions and depend on GSNO level. The breakdown of GSNO and thus the level of S-nitrosylated proteins are regulated by GSNO-reductase (GSNOR). In this way, this enzyme controls S-nitrosothiol levels and regulates NO signaling. Here we report that Arabidopsis thaliana GSNOR activity is reversibly inhibited by H2O2 in-vitro and by paraquat-induced oxidative stress in-vivo. Light scattering analyses of reduced and oxidized recombinant GSNOR demonstrated that GSNOR proteins form dimers under both reducing and oxidizing conditions. Moreover, mass spectrometric analyses revealed that H2O2-treatment increased the amount of oxidative modifications on Zn2+-coordinating Cys47 and Cys177. Inhibition of GSNOR results in enhanced levels of S-nitrosothiols followed by accumulation of glutathione. Moreover, transcript levels of redox-regulated genes and activities of glutathione-dependent enzymes are increased in gsnor-ko plants, which may contribute to the enhanced resistance against oxidative stress. In sum, our results demonstrate that ROS-dependent inhibition of GSNOR is playing an important role in activation of anti-oxidative mechanisms to damping oxidative damage and imply a direct crosstalk between ROS- and NO-signaling. | ||
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| 650 | 4 | |a Oxidative Stress | |
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| 650 | 4 | |a Reactive Oxygen Species | |
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