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Abstract
Intracellular signaling during oxidative stress is complex, with organelle-to-nucleus retrograde communication pathways ill-defined or incomplete. Here we identify the 3’-phosphoadenosine 5’-phosphate (PAP) phosphatase SAL1 as a novel and conserved oxidative stress sensor in plant chloroplasts. Arabidopsis thaliana SAL1 (AtSAL1) senses changes in photosynthetic redox poise, hydrogen peroxide, and superoxide concentrations in chloroplasts via redox regulatory mechanisms. AtSAL1 phosphatase activity is suppressed by dimerization, intramolecular disulfide formation and glutathionylation, allowing accumulation of its substrate, PAP; a chloroplast stress retrograde signal that regulates expression of Plastid Redox Associated Nuclear Genes (PRANGs). This redox regulation of SAL1 for activation of chloroplast signaling is conserved in the plant kingdom, and the plant protein has evolved enhanced redox sensitivity compared to its yeast ortholog. Our results indicate that, in addition to sulfur metabolism, SAL1 orthologs have evolved secondary functions in oxidative stress sensing in the plant kingdom.
Original language | English |
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Pages (from-to) | E4567-E4576 |
Number of pages | 10 |
Journal | National Academy of Sciences. Proceedings |
Volume | 113 |
Issue number | 31 |
Early online date | 18 Jul 2016 |
DOIs | |
Publication status | Published - 2 Aug 2016 |
Keywords
- retrograde signaling
- redox regulation
- stress sensing
- chloroplast
- drought stress
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Dive into the research topics of 'Sensing and signaling of oxidative stress in chloroplasts by inactivation of the SAL1 phosphoadenosine phosphatase'. Together they form a unique fingerprint.Projects
- 1 Finished
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Pre-Receptor Regulation of Dehydroepiandrosterone Synthesis, Metabolism and Action
1/08/04 → 31/10/09
Project: Research Councils