Redox-regulation of mitochondrial metabolism through thioredoxin o1 facilitates light induction of photosynthesis
- 7 October 2019
- journal article
- research article
- Published by Taylor & Francis Ltd in Plant Signaling & Behavior
- Vol. 14 (12), 1674607
- https://doi.org/10.1080/15592324.2019.1674607
Abstract
Despite the well-known biochemistry of the major pathways involved in central carbon and amino acid metabolism, there are still gaps regarding their regulation or regulatory interactions. Recent research demonstrated the physiological significance of the mitochondrial redox machinery, particularly thioredoxin o1 (TRXo1), for proper regulation of the tricarboxylic acid cycle, components of the mitochondrial electron transport chain and photorespiration. These findings imply that TRXo1 regulation contributes to the metabolic acclimation toward changes in the prevailing environmental conditions. Here, we analyzed if TRXo1 is involved in the light induction of photosynthesis. Our results show that the trxo1 mutant activates CO2 assimilation rates to a significantly lower extend than wild type in response to short-term light/dark changes. Metabolite analysis suggests that activation of glycine-to-serine conversion catalyzed through glycine decarboxylase in conjunction with serine hydroxymethyltransferase in trxo1 is slowed down at onset of illumination. We propose that redox regulation via TRXo1 is necessary to allow the rapid induction of mitochondrial steps of the photorespiratory cycle and, in turn, to facilitate light-induction of photosynthesis.Keywords
This publication has 41 references indexed in Scilit:
- Regulation of the mitochondrial tricarboxylic acid cycleCurrent Opinion in Plant Biology, 2013
- Redox regulation of the Calvin–Benson cycle: something old, something newFrontiers in Plant Science, 2013
- The Tricarboxylic Acid Cycle in CyanobacteriaScience, 2011
- Not just a circle: flux modes in the plant TCA cycleTrends in Plant Science, 2010
- Photorespiration: players, partners and originTrends in Plant Science, 2010
- Thioredoxins and Glutaredoxins: Unifying Elements in Redox BiologyAnnual Review of Genetics, 2009
- The enigmatic contribution of mitochondrial function in photosynthesisJournal of Experimental Botany, 2007
- THECOMPLEXFATE OFα-KETOACIDSAnnual Review of Plant Biology, 2002
- Animal and plant mitochondria contain specific thioredoxinsFEBS Letters, 1989
- NADP+‐malate dehydrogenase in C3‐plants: Regulation and role of a light‐activated enzymePhysiologia Plantarum, 1987