Evidence for a SAL1-PAP chloroplast retrograde pathway that functions in drought and high light signaling in arabidopsis
Compartmentation of the eukaryotic cell requires a complex set of subcellular messages, including multiple retrograde signals from the chloroplast and mitochondria to the nucleus, to regulate gene expression. Here, we propose that one such signal is a phosphonucleotide (3′-phosphoadenosine 5′-phosph...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
November 29, 2011
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| In: |
The plant cell
Year: 2011, Jahrgang: 23, Heft: 11, Pages: 3992-4012 |
| ISSN: | 1532-298X |
| DOI: | 10.1105/tpc.111.091033 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1105/tpc.111.091033 Verlag, Volltext: http://www.plantcell.org/content/23/11/3992 
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| Verfasserangaben: | Gonzalo M. Estavillo, Peter A. Crisp, Wannarat Pornsiriwong, Markus Wirtz, Derek Collinge, Chris Carrie, Estelle Giraud, James Whelan, Pascale David, Hélène Javot, Charles Brearley, Rüdiger Hell, Elena Marin, and Barry J. Pogson |
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| 245 | 1 | 0 | |a Evidence for a SAL1-PAP chloroplast retrograde pathway that functions in drought and high light signaling in arabidopsis |c Gonzalo M. Estavillo, Peter A. Crisp, Wannarat Pornsiriwong, Markus Wirtz, Derek Collinge, Chris Carrie, Estelle Giraud, James Whelan, Pascale David, Hélène Javot, Charles Brearley, Rüdiger Hell, Elena Marin, and Barry J. Pogson |
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| 520 | |a Compartmentation of the eukaryotic cell requires a complex set of subcellular messages, including multiple retrograde signals from the chloroplast and mitochondria to the nucleus, to regulate gene expression. Here, we propose that one such signal is a phosphonucleotide (3′-phosphoadenosine 5′-phosphate [PAP]), which accumulates in Arabidopsis thaliana in response to drought and high light (HL) stress and that the enzyme SAL1 regulates its levels by dephosphorylating PAP to AMP. SAL1 accumulates in chloroplasts and mitochondria but not in the cytosol. sal1 mutants accumulate 20-fold more PAP without a marked change in inositol phosphate levels, demonstrating that PAP is a primary in vivo substrate. Significantly, transgenic targeting of SAL1 to either the nucleus or chloroplast of sal1 mutants lowers the total PAP levels and expression of the HL-inducible ASCORBATE PEROXIDASE2 gene. This indicates that PAP must be able to move between cellular compartments. The mode of action for PAP could be inhibition of 5′ to 3′ exoribonucleases (XRNs), as SAL1 and the nuclear XRNs modulate the expression of a similar subset of HL and drought-inducible genes, sal1 mutants accumulate XRN substrates, and PAP can inhibit yeast (Saccharomyces cerevisiae) XRNs. We propose a SAL1-PAP retrograde pathway that can alter nuclear gene expression during HL and drought stress. | ||
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