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Timm S, Klaas N, Niemann J, Jahnke K, Alseekh S, Zhang Y, Souza PVL, Hou LY, Cosse M, Selinski J, Geigenberger P, Daloso DM, Fernie AR, Hagemann M. Thioredoxins o1 and h2 jointly adjust mitochondrial dihydrolipoamide dehydrogenase-dependent pathways towards changing environments. Plant Cell Environ 2024. [PMID: 38518065 DOI: 10.1111/pce.14899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 03/24/2024]
Abstract
Thioredoxins (TRXs) are central to redox regulation, modulating enzyme activities to adapt metabolism to environmental changes. Previous research emphasized mitochondrial and microsomal TRX o1 and h2 influence on mitochondrial metabolism, including photorespiration and the tricarboxylic acid (TCA) cycle. Our study aimed to compare TRX-based regulation circuits towards environmental cues mainly affecting photorespiration. Metabolite snapshots, phenotypes and CO2 assimilation were compared among single and multiple TRX mutants in the wild-type and the glycine decarboxylase T-protein knockdown (gldt1) background. Our analyses provided evidence for additive negative effects of combined TRX o1 and h2 deficiency on growth and photosynthesis. Especially metabolite accumulation patterns suggest a shared regulation mechanism mainly on mitochondrial dihydrolipoamide dehydrogenase (mtLPD1)-dependent pathways. Quantification of pyridine nucleotides, in conjunction with 13C-labelling approaches, and biochemical analysis of recombinant mtLPD1 supported this. It also revealed mtLPD1 inhibition by NADH, pointing at an additional measure to fine-tune it's activity. Collectively, we propose that lack of TRX o1 and h2 perturbs the mitochondrial redox state, which impacts on other pathways through shifts in the NADH/NAD+ ratio via mtLPD1. This regulation module might represent a node for simultaneous adjustments of photorespiration, the TCA cycle and branched chain amino acid degradation under fluctuating environmental conditions.
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Affiliation(s)
- Stefan Timm
- Plant Physiology Department, University of Rostock, Rostock, Germany
| | - Nicole Klaas
- Plant Physiology Department, University of Rostock, Rostock, Germany
| | - Janice Niemann
- Plant Physiology Department, University of Rostock, Rostock, Germany
| | - Kathrin Jahnke
- Plant Physiology Department, University of Rostock, Rostock, Germany
| | - Saleh Alseekh
- Max Planck Institute of Molecular Plant Physiology, Golm, Germany
| | - Youjun Zhang
- Max Planck Institute of Molecular Plant Physiology, Golm, Germany
- Center of Plant System Biology and Biotechnology, Plovdiv, Bulgaria
| | - Paulo V L Souza
- LabPlant, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza, Brazil
| | - Liang-Yu Hou
- Department Biology I, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
| | - Maike Cosse
- Department of Plant Cell Biology, Botanical Institute, Christian-Albrechts University Kiel, Kiel, Germany
| | - Jennifer Selinski
- Department of Plant Cell Biology, Botanical Institute, Christian-Albrechts University Kiel, Kiel, Germany
| | - Peter Geigenberger
- Department Biology I, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
| | - Danilo M Daloso
- LabPlant, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza, Brazil
| | - Alisdair R Fernie
- Max Planck Institute of Molecular Plant Physiology, Golm, Germany
- Center of Plant System Biology and Biotechnology, Plovdiv, Bulgaria
| | - Martin Hagemann
- Plant Physiology Department, University of Rostock, Rostock, Germany
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Luna M, Gastone F, Tosco T, Sethi R, Velimirovic M, Gemoets J, Muyshondt R, Sapion H, Klaas N, Bastiaens L. Pressure-controlled injection of guar gum stabilized microscale zerovalent iron for groundwater remediation. J Contam Hydrol 2015; 181:46-58. [PMID: 25971233 DOI: 10.1016/j.jconhyd.2015.04.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 04/15/2015] [Accepted: 04/19/2015] [Indexed: 06/04/2023]
Abstract
The paper reports a pilot injection test of microsized zerovalent iron (mZVI) dispersed in a guar gum shear thinning solution. The test was performed in the framework of the EU research project AQUAREHAB in a site in Belgium contaminated by chlorinated aliphatic hydrocarbons (CAHs). The field application was aimed to overcome those critical aspects which hinder mZVI field injection, mainly due to the colloidal instability of ZVI-based suspensions. The iron slurry properties (iron particles size and concentration, polymeric stabilizer type and concentration, slurry viscosity) were designed in the laboratory based on several tests (reactivity tests towards contaminants, sedimentation tests and rheological measurements). The particles were delivered into the aquifer through an injection well specifically designed for controlled-pressure delivery (approximately 10 bars). The well characteristics and the critical pressure of the aquifer (i.e. the injection pressure above which fracturing occurs) were assessed via two innovative injection step rate tests, one performed with water and the other one with guar gum. Based on laboratory and field preliminary tests, a flow regime at the threshold between permeation and preferential flow was selected for mZVI delivery, as a compromise between the desired homogeneous distribution of the mZVI around the injection point (ensured by permeation flow) and the fast and effective injection of the slurry (guaranteed by high discharge rates and injection pressure, resulting in the generation of preferential flow paths). A monitoring setup was designed and installed for the real-time monitoring of relevant parameters during injection, and for a fast determination of the spatial mZVI distribution after injection via non-invasive magnetic susceptibility measurements.
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Affiliation(s)
- M Luna
- Dipartimento di Ingegneria dell'Ambiente, del Territorio e delle Infrastrutture-Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - F Gastone
- Dipartimento di Ingegneria dell'Ambiente, del Territorio e delle Infrastrutture-Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - T Tosco
- Dipartimento di Ingegneria dell'Ambiente, del Territorio e delle Infrastrutture-Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - R Sethi
- Dipartimento di Ingegneria dell'Ambiente, del Territorio e delle Infrastrutture-Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy.
| | - M Velimirovic
- VITO, Boeretang 200, 2400 Mol, Belgium; Department of Environmental Geosciences, University of Wien, Althanstrasse 14, 1090 Wien, Austria
| | - J Gemoets
- VITO, Boeretang 200, 2400 Mol, Belgium
| | | | - H Sapion
- SAPION, Oude Bevelsesteenweg 51, 2560 Nijlen, Belgium
| | - N Klaas
- VEGAS, University of Stuttgart, Pfaffenwaldring 61, 70569 Stuttgart, Germany
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Buerck J, Roth S, Kraemer K, Scholz M, Klaas N. Application of a fiber-optic NIR-EFA sensor system for in situ monitoring of aromatic hydrocarbons in contaminated groundwater. J Hazard Mater 2001; 83:11-28. [PMID: 11267742 DOI: 10.1016/s0304-3894(00)00335-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Interaction of analyte molecules with the evanescent wave of light guided in optical fibers is among the most promising novel sensing schemes that can be applied for environmental monitoring and on-line process analysis. By combining this measuring principle with the solid-phase extraction of analyte molecules into the polymer cladding of a fiber, it is possible to perform direct absorption measurements in the cladding, if the fiber is adapted to a conventional spectrometer/photometer. A big advantage of this arrangement is that the measurement is scarcely disturbed by matrix effects (background absorption of water in IR measurements, stray light due to turbidity in the sample). By using near-infrared (NIR) evanescent field absorption (EFA) measurements in quartz glass fibers coated with a hydrophobic silicone membrane it is possible to design and construct sensors for monitoring apolar hydrocarbons (HCs) in aqueous matrices.The paper presents a fiber-optic sensor system for the determination of aromatic HCs in groundwater or industrial wastewater. Generally, this instrument is suitable for quantitative in situ monitoring of pollutants such as aromatic solvents, fuels, mineral oils or chlorinated HCs with relatively low water saturation solubility (typically between 0.01 and 10 g l(-1)). The sensor probe is connected via all-silica fibers to a filter photometer developed at the IFIA, thus, allowing even remote analysis in a monitoring well. This portable instrument provides a total concentration signal of the organic compounds extracted into the fiber cladding by measuring the integral absorption at the 1st C--H overtone bands in the NIR spectral range. In situ measurements with the sensor system were performed in a groundwater circulation well at the VEGAS research facility of the University of Stuttgart (Germany). The NIR-EFA sensor system was tested within the frame of an experiment that was carried through in a tank containing sandy gravel with a groundwater-saturated aquifer, where soil and groundwater were contaminated with technical grade xylene. The goal of this experiment was to model and optimize the groundwater circulation well used for the remediation of the aquifer and soil surrounding the well. The sensor proved to trace reliably the total hydrocarbon concentration in the process water pumped from the well to a stripper column. Measurements were performed continuously over 4 months with C8 HC sum concentrations in the process water between 80 mg l(-1) down to the limit of detection, which is around 200 microg l(-1). It could be demonstrated that the fiber-optic sensor system is a valuable tool for near-real-time control of a remedial action technique and verification and documentation of its success.
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Affiliation(s)
- J Buerck
- Forschungszentrum Karlsruhe, Institut für Instrumentelle Analytik, P.O. Box 3640, D-76021 Karlsruhe, Germany.
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