1
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Steichen S, Deshpande A, Mosey M, Loob J, Douchi D, Knoshaug EP, Brown S, Nielsen R, Weissman J, Carrillo LR, Laurens LML. Central transcriptional regulator controls photosynthetic growth and carbon storage in response to high light. Nat Commun 2024; 15:4842. [PMID: 38844786 PMCID: PMC11156908 DOI: 10.1038/s41467-024-49090-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 05/14/2024] [Indexed: 06/09/2024] Open
Abstract
Carbon capture and biochemical storage are some of the primary drivers of photosynthetic yield and productivity. To elucidate the mechanisms governing carbon allocation, we designed a photosynthetic light response test system for genetic and metabolic carbon assimilation tracking, using microalgae as simplified plant models. The systems biology mapping of high light-responsive photophysiology and carbon utilization dynamics between two variants of the same Picochlorum celeri species, TG1 and TG2 elucidated metabolic bottlenecks and transport rates of intermediates using instationary 13C-fluxomics. Simultaneous global gene expression dynamics showed 73% of the annotated genes responding within one hour, elucidating a singular, diel-responsive transcription factor, closely related to the CCA1/LHY clock genes in plants, with significantly altered expression in TG2. Transgenic P. celeri TG1 cells expressing the TG2 CCA1/LHY gene, showed 15% increase in growth rates and 25% increase in storage carbohydrate content, supporting a coordinating regulatory function for a single transcription factor.
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Affiliation(s)
- Seth Steichen
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Arnav Deshpande
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Megan Mosey
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Jessica Loob
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Damien Douchi
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Eric P Knoshaug
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA
| | - Stuart Brown
- ExxonMobil Technology and Engineering Co. (EMTEC), CLD286 Annandale, 1545 Route 22 East, Annandale, NJ, 08801, USA
| | - Robert Nielsen
- ExxonMobil Technology and Engineering Co. (EMTEC), CLD286 Annandale, 1545 Route 22 East, Annandale, NJ, 08801, USA
| | - Joseph Weissman
- ExxonMobil Technology and Engineering Co. (EMTEC), CLD286 Annandale, 1545 Route 22 East, Annandale, NJ, 08801, USA
| | - L Ruby Carrillo
- ExxonMobil Technology and Engineering Co. (EMTEC), CLD286 Annandale, 1545 Route 22 East, Annandale, NJ, 08801, USA
| | - Lieve M L Laurens
- Bioenergy Science and Technology Directorate, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA.
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2
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Riaz A, Deng F, Chen G, Jiang W, Zheng Q, Riaz B, Mak M, Zeng F, Chen ZH. Molecular Regulation and Evolution of Redox Homeostasis in Photosynthetic Machinery. Antioxidants (Basel) 2022; 11:antiox11112085. [PMID: 36358456 PMCID: PMC9686623 DOI: 10.3390/antiox11112085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/14/2022] [Accepted: 10/20/2022] [Indexed: 01/14/2023] Open
Abstract
The recent advances in plant biology have significantly improved our understanding of reactive oxygen species (ROS) as signaling molecules in the redox regulation of complex cellular processes. In plants, free radicals and non-radicals are prevalent intra- and inter-cellular ROS, catalyzing complex metabolic processes such as photosynthesis. Photosynthesis homeostasis is maintained by thiol-based systems and antioxidative enzymes, which belong to some of the evolutionarily conserved protein families. The molecular and biological functions of redox regulation in photosynthesis are usually to balance the electron transport chain, photosystem II, photosystem I, mesophyll and bundle sheath signaling, and photo-protection regulating plant growth and productivity. Here, we review the recent progress of ROS signaling in photosynthesis. We present a comprehensive comparative bioinformatic analysis of redox regulation in evolutionary distinct photosynthetic cells. Gene expression, phylogenies, sequence alignments, and 3D protein structures in representative algal and plant species revealed conserved key features including functional domains catalyzing oxidation and reduction reactions. We then discuss the antioxidant-related ROS signaling and important pathways for achieving homeostasis of photosynthesis. Finally, we highlight the importance of plant responses to stress cues and genetic manipulation of disturbed redox status for balanced and enhanced photosynthetic efficiency and plant productivity.
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Affiliation(s)
- Adeel Riaz
- Hubei Collaborative Innovation Center for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 414000, China
| | - Fenglin Deng
- Hubei Collaborative Innovation Center for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 414000, China
| | - Guang Chen
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Wei Jiang
- Hubei Collaborative Innovation Center for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 414000, China
| | - Qingfeng Zheng
- Hubei Collaborative Innovation Center for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 414000, China
| | - Bisma Riaz
- Department of Biotechnology, University of Okara, Okara, Punjab 56300, Pakistan
| | - Michelle Mak
- School of Science, Western Sydney University, Penrith, NSW 2751, Australia
| | - Fanrong Zeng
- Hubei Collaborative Innovation Center for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 414000, China
- Correspondence: (F.Z.); (Z.-H.C.)
| | - Zhong-Hua Chen
- School of Science, Western Sydney University, Penrith, NSW 2751, Australia
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia
- Correspondence: (F.Z.); (Z.-H.C.)
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3
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Dao O, Kuhnert F, Weber APM, Peltier G, Li-Beisson Y. Physiological functions of malate shuttles in plants and algae. TRENDS IN PLANT SCIENCE 2022; 27:488-501. [PMID: 34848143 DOI: 10.1016/j.tplants.2021.11.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 11/02/2021] [Accepted: 11/04/2021] [Indexed: 06/13/2023]
Abstract
Subcellular compartmentalization confers evolutionary advantage to eukaryotic cells but entails the need for efficient interorganelle communication. Malate functions as redox carrier and metabolic intermediate. It can be shuttled across membranes through translocators. The interconversion of malate and oxaloacetate mediated by malate dehydrogenases requires oxidation/reduction of NAD(P)H/NAD(P)+; therefore, malate trafficking serves to transport reducing equivalents and this is termed the 'malate shuttle'. Although the term 'malate shuttle' was coined more than 50 years ago, novel functions are still emerging. This review highlights recent findings on the functions of malate shuttles in photorespiration, fatty acid β-oxidation, interorganelle signaling and its putative role in CO2-concentrating mechanisms. We compare and contrast knowledge in plants and algae, thereby providing an evolutionary perspective on redox trafficking in photosynthetic eukaryotes.
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Affiliation(s)
- Ousmane Dao
- Aix Marseille Univ, CEA, CNRS, BIAM, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, Saint Paul-Lez-Durance 13108, France
| | - Franziska Kuhnert
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Science (CEPLAS), Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Andreas P M Weber
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Science (CEPLAS), Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Gilles Peltier
- Aix Marseille Univ, CEA, CNRS, BIAM, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, Saint Paul-Lez-Durance 13108, France
| | - Yonghua Li-Beisson
- Aix Marseille Univ, CEA, CNRS, BIAM, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, Saint Paul-Lez-Durance 13108, France.
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4
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Matiolli CC, Soares RC, Alves HLS, Abreu IA. Turning the Knobs: The Impact of Post-translational Modifications on Carbon Metabolism. FRONTIERS IN PLANT SCIENCE 2022; 12:781508. [PMID: 35087551 PMCID: PMC8787203 DOI: 10.3389/fpls.2021.781508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 12/15/2021] [Indexed: 06/14/2023]
Abstract
Plants rely on the carbon fixed by photosynthesis into sugars to grow and reproduce. However, plants often face non-ideal conditions caused by biotic and abiotic stresses. These constraints impose challenges to managing sugars, the most valuable plant asset. Hence, the precise management of sugars is crucial to avoid starvation under adverse conditions and sustain growth. This review explores the role of post-translational modifications (PTMs) in the modulation of carbon metabolism. PTMs consist of chemical modifications of proteins that change protein properties, including protein-protein interaction preferences, enzymatic activity, stability, and subcellular localization. We provide a holistic view of how PTMs tune resource distribution among different physiological processes to optimize plant fitness.
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Milrad Y, Schweitzer S, Feldman Y, Yacoby I. Bi-directional electron transfer between H2 and NADPH mitigates light fluctuation responses in green algae. PLANT PHYSIOLOGY 2021; 186:168-179. [PMID: 33793951 PMCID: PMC8154092 DOI: 10.1093/plphys/kiab051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 01/21/2021] [Indexed: 05/05/2023]
Abstract
The metabolism of green algae has been the focus of much research over the last century. These photosynthetic organisms can thrive under various conditions and adapt quickly to changing environments by concomitant usage of several metabolic apparatuses. The main electron coordinator in their chloroplasts, nicotinamide adenine dinucleotide phosphate (NADPH), participates in many enzymatic activities and is also responsible for inter-organellar communication. Under anaerobic conditions, green algae also accumulate molecular hydrogen (H2), a promising alternative for fossil fuels. However, to scale-up its accumulation, a firm understanding of its integration in the photosynthetic apparatus is still required. While it is generally accepted that NADPH metabolism correlates to H2 accumulation, the mechanism of this collaboration is still vague and relies on indirect measurements. Here, we investigated this connection in Chlamydomonas reinhardtii using simultaneous measurements of both dissolved gases concentration, NADPH fluorescence and electrochromic shifts at 520-546 nm. Our results indicate that energy transfer between H2 and NADPH is bi-directional and crucial for the maintenance of redox balance under light fluctuations. At light onset, NADPH consumption initially eventuates in H2 evolution, which initiates the photosynthetic electron flow. Later on, as illumination continues the majority of NADPH is diverted to the Calvin-Benson-Bassham cycle. Dark onset triggers re-assimilation of H2, which produces NADPH and so, enables initiation of dark fermentative metabolism.
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Affiliation(s)
- Yuval Milrad
- School of Plant Sciences and Food Security, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - Shira Schweitzer
- School of Plant Sciences and Food Security, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - Yael Feldman
- School of Plant Sciences and Food Security, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - Iftach Yacoby
- School of Plant Sciences and Food Security, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
- Author for communication: (I.Y.)
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Launay H, Shao H, Bornet O, Cantrelle FX, Lebrun R, Receveur-Brechot V, Gontero B. Flexibility of Oxidized and Reduced States of the Chloroplast Regulatory Protein CP12 in Isolation and in Cell Extracts. Biomolecules 2021; 11:biom11050701. [PMID: 34066751 PMCID: PMC8151241 DOI: 10.3390/biom11050701] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/03/2021] [Accepted: 05/04/2021] [Indexed: 12/12/2022] Open
Abstract
In the chloroplast, Calvin–Benson–Bassham enzymes are active in the reducing environment created in the light by electrons from the photosystems. In the dark, these enzymes are inhibited, mainly caused by oxidation of key regulatory cysteine residues. CP12 is a small protein that plays a role in this regulation with four cysteine residues that undergo a redox transition. Using amide-proton exchange with solvent, measured by nuclear magnetic resonance (NMR) and mass-spectrometry, we confirmed that reduced CP12 is intrinsically disordered. Using real-time NMR, we showed that the oxidation of the two disulfide bridges is simultaneous. In oxidized CP12, the C23–C31 pair is in a region that undergoes a conformational exchange in the NMR-intermediate timescale. The C66–C75 pair is in the C-terminus that folds into a stable helical turn. We confirmed that these structural states exist in a physiologically relevant environment: a cell extract from Chlamydomonas reinhardtii. Consistent with these structural equilibria, the reduction is slower for the C66–C75 pair than for the C23–C31 pair. The redox mid-potentials for the two cysteine pairs differ and are similar to those found for glyceraldehyde 3-phosphate dehydrogenase and phosphoribulokinase, consistent with the regulatory role of CP12.
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Affiliation(s)
- Helene Launay
- Aix Marseille Univ, CNRS, BIP, UMR7281, F-13402 Marseille, France; (H.S.); (V.R.-B.)
- Correspondence: (H.L.); (B.G.)
| | - Hui Shao
- Aix Marseille Univ, CNRS, BIP, UMR7281, F-13402 Marseille, France; (H.S.); (V.R.-B.)
| | - Olivier Bornet
- NMR Platform, Institut de Microbiologie de la Méditerranée, Aix Marseille Univ, F-13009 Marseille, France;
| | - Francois-Xavier Cantrelle
- CNRS, ERL9002, Integrative Structural Biology, Univ. Lille, F-59658 Lille, France;
- U1167, INSERM, CHU Lille, Institut Pasteur de Lille, F-59019 Lille, France
| | - Regine Lebrun
- Plate-forme Protéomique, Marseille Protéomique (MaP), IMM FR 3479, 31 Chemin Joseph Aiguier, F-13009 Marseille, France;
| | | | - Brigitte Gontero
- Aix Marseille Univ, CNRS, BIP, UMR7281, F-13402 Marseille, France; (H.S.); (V.R.-B.)
- Correspondence: (H.L.); (B.G.)
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7
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Ford MM, Smythers AL, McConnell EW, Lowery SC, Kolling DRJ, Hicks LM. Inhibition of TOR in Chlamydomonas reinhardtii Leads to Rapid Cysteine Oxidation Reflecting Sustained Physiological Changes. Cells 2019; 8:cells8101171. [PMID: 31569396 PMCID: PMC6829209 DOI: 10.3390/cells8101171] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/16/2019] [Accepted: 09/26/2019] [Indexed: 12/16/2022] Open
Abstract
The target of rapamycin (TOR) kinase is a master metabolic regulator with roles in nutritional sensing, protein translation, and autophagy. In Chlamydomonas reinhardtii, a unicellular green alga, TOR has been linked to the regulation of increased triacylglycerol (TAG) accumulation, suggesting that TOR or a downstream target(s) is responsible for the elusive “lipid switch” in control of increasing TAG accumulation under nutrient limitation. However, while TOR has been well characterized in mammalian systems, it is still poorly understood in photosynthetic systems, and little work has been done to show the role of oxidative signaling in TOR regulation. In this study, the TOR inhibitor AZD8055 was used to relate reversible thiol oxidation to the physiological changes seen under TOR inhibition, including increased TAG content. Using oxidized cysteine resin-assisted capture enrichment coupled with label-free quantitative proteomics, 401 proteins were determined to have significant changes in oxidation following TOR inhibition. These oxidative changes mirrored characterized physiological modifications, supporting the role of reversible thiol oxidation in TOR regulation of TAG production, protein translation, carbohydrate catabolism, and photosynthesis through the use of reversible thiol oxidation. The delineation of redox-controlled proteins under TOR inhibition provides a framework for further characterization of the TOR pathway in photosynthetic eukaryotes.
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Affiliation(s)
- Megan M Ford
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | - Amanda L Smythers
- Department of Chemistry, Marshall University, Huntington, WV 25755, USA.
| | - Evan W McConnell
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | - Sarah C Lowery
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | | | - Leslie M Hicks
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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8
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Burlacot A, Peltier G, Li-Beisson Y. Subcellular Energetics and Carbon Storage in Chlamydomonas. Cells 2019; 8:E1154. [PMID: 31561610 PMCID: PMC6830334 DOI: 10.3390/cells8101154] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 09/19/2019] [Accepted: 09/24/2019] [Indexed: 01/09/2023] Open
Abstract
Microalgae have emerged as a promising platform for production of carbon- and energy- rich molecules, notably starch and oil. Establishing an economically viable algal biotechnology sector requires a holistic understanding of algal photosynthesis, physiology, cell cycle and metabolism. Starch/oil productivity is a combined effect of their cellular content and cell division activities. Cell growth, starch and fatty acid synthesis all require carbon building blocks and a source of energy in the form of ATP and NADPH, but with a different requirement in ATP/NADPH ratio. Thus, several cellular mechanisms have been developed by microalgae to balance ATP and NADPH supply which are essentially produced by photosynthesis. Major energy management mechanisms include ATP production by the chloroplast-based cyclic electron flow and NADPH removal by water-water cycles. Furthermore, energetic coupling between chloroplast and other cellular compartments, mitochondria and peroxisome, is increasingly recognized as an important process involved in the chloroplast redox poise. Emerging literature suggests that alterations of energy management pathways affect not only cell fitness and survival, but also influence biomass content and composition. These emerging discoveries are important steps towards diverting algal photosynthetic energy to useful products for biotechnological applications.
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Affiliation(s)
- Adrien Burlacot
- Aix Marseille Univ, CEA, CNRS, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache CEDEX, 13108 Saint Paul-Lez-Durance, France.
| | - Gilles Peltier
- Aix Marseille Univ, CEA, CNRS, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache CEDEX, 13108 Saint Paul-Lez-Durance, France.
| | - Yonghua Li-Beisson
- Aix Marseille Univ, CEA, CNRS, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache CEDEX, 13108 Saint Paul-Lez-Durance, France.
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9
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Li-Beisson Y, Thelen JJ, Fedosejevs E, Harwood JL. The lipid biochemistry of eukaryotic algae. Prog Lipid Res 2019; 74:31-68. [PMID: 30703388 DOI: 10.1016/j.plipres.2019.01.003] [Citation(s) in RCA: 175] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 01/22/2019] [Accepted: 01/23/2019] [Indexed: 02/06/2023]
Abstract
Algal lipid metabolism fascinates both scientists and entrepreneurs due to the large diversity of fatty acyl structures that algae produce. Algae have therefore long been studied as sources of genes for novel fatty acids; and, due to their superior biomass productivity, algae are also considered a potential feedstock for biofuels. However, a major issue in a commercially viable "algal oil-to-biofuel" industry is the high production cost, because most algal species only produce large amounts of oils after being exposed to stress conditions. Recent studies have therefore focused on the identification of factors involved in TAG metabolism, on the subcellular organization of lipid pathways, and on interactions between organelles. This has been accompanied by the development of genetic/genomic and synthetic biological tools not only for the reference green alga Chlamydomonas reinhardtii but also for Nannochloropsis spp. and Phaeodactylum tricornutum. Advances in our understanding of enzymes and regulatory proteins of acyl lipid biosynthesis and turnover are described herein with a focus on carbon and energetic aspects. We also summarize how changes in environmental factors can impact lipid metabolism and describe present and potential industrial uses of algal lipids.
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Affiliation(s)
- Yonghua Li-Beisson
- Aix-Marseille Univ, CEA, CNRS, BIAM, UMR7265, CEA Cadarache, Saint-Paul-lez Durance F-13108, France.
| | - Jay J Thelen
- Department of Biochemistry, University of Missouri, Christopher S. Bond Life Sciences Center, Columbia, MO 65211, United States.
| | - Eric Fedosejevs
- Department of Biochemistry, University of Missouri, Christopher S. Bond Life Sciences Center, Columbia, MO 65211, United States.
| | - John L Harwood
- School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK.
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10
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Dumont S, Rivoal J. Consequences of Oxidative Stress on Plant Glycolytic and Respiratory Metabolism. FRONTIERS IN PLANT SCIENCE 2019; 10:166. [PMID: 30833954 PMCID: PMC6387960 DOI: 10.3389/fpls.2019.00166] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 01/31/2019] [Indexed: 05/03/2023]
Abstract
Reactive oxygen species (ROS) and reactive nitrogen species (RNS) are present at low and controlled levels under normal conditions. These reactive molecules can increase to high levels under various biotic and abiotic conditions, resulting in perturbation of the cellular redox state that can ultimately lead to oxidative or nitrosative stress. In this review, we analyze the various effects that result from alterations of redox homeostasis on plant glycolytic pathway and tricarboxylic acid (TCA) cycle. Most documented modifications caused by ROS or RNS are due to the presence of redox-sensitive cysteine thiol groups in proteins. Redox modifications include Cys oxidation, disulfide bond formation, S-glutathionylation, S-nitrosylation, and S-sulfhydration. A growing number of proteomic surveys and biochemical studies document the occurrence of ROS- or RNS-mediated modification in enzymes of glycolysis and the TCA cycle. In a few cases, these modifications have been shown to affect enzyme activity, suggesting an operational regulatory mechanism in vivo. Further changes induced by oxidative stress conditions include the proposed redox-dependent modifications in the subcellular distribution of a putative redox sensor, NAD-glyceraldehyde-3P dehydrogenase and the micro-compartmentation of cytosolic glycolytic enzymes. Data from the literature indicate that oxidative stress may induce complex changes in metabolite pools in central carbon metabolism. This information is discussed in the context of our understanding of plant metabolic response to oxidative stress.
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11
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Kong F, Burlacot A, Liang Y, Légeret B, Alseekh S, Brotman Y, Fernie AR, Krieger-Liszkay A, Beisson F, Peltier G, Li-Beisson Y. Interorganelle Communication: Peroxisomal MALATE DEHYDROGENASE2 Connects Lipid Catabolism to Photosynthesis through Redox Coupling in Chlamydomonas. THE PLANT CELL 2018; 30:1824-1847. [PMID: 29997239 PMCID: PMC6139685 DOI: 10.1105/tpc.18.00361] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/12/2018] [Accepted: 07/10/2018] [Indexed: 05/17/2023]
Abstract
Plants and algae must tightly coordinate photosynthetic electron transport and metabolic activities given that they often face fluctuating light and nutrient conditions. The exchange of metabolites and signaling molecules between organelles is thought to be central to this regulation but evidence for this is still fragmentary. Here, we show that knocking out the peroxisome-located MALATE DEHYDROGENASE2 (MDH2) of Chlamydomonas reinhardtii results in dramatic alterations not only in peroxisomal fatty acid breakdown but also in chloroplast starch metabolism and photosynthesis. mdh2 mutants accumulated 50% more storage lipid and 2-fold more starch than the wild type during nitrogen deprivation. In parallel, mdh2 showed increased photosystem II yield and photosynthetic CO2 fixation. Metabolite analyses revealed a >60% reduction in malate, together with increased levels of NADPH and H2O2 in mdh2 Similar phenotypes were found upon high light exposure. Furthermore, based on the lack of starch accumulation in a knockout mutant of the H2O2-producing peroxisomal ACYL-COA OXIDASE2 and on the effects of H2O2 supplementation, we propose that peroxisome-derived H2O2 acts as a regulator of chloroplast metabolism. We conclude that peroxisomal MDH2 helps photoautotrophs cope with nitrogen scarcity and high light by transmitting the redox state of the peroxisome to the chloroplast by means of malate shuttle- and H2O2-based redox signaling.
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Affiliation(s)
- Fantao Kong
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
| | - Adrien Burlacot
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
| | - Yuanxue Liang
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
| | - Bertrand Légeret
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
| | - Saleh Alseekh
- Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany
- Center of Plant System Biology and Biotechnology, 4000 Plovdiv, Bulgaria
| | - Yariv Brotman
- Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany
| | - Alisdair R Fernie
- Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany
- Center of Plant System Biology and Biotechnology, 4000 Plovdiv, Bulgaria
| | - Anja Krieger-Liszkay
- Institute for Integrative Biology of the Cell, CEA Saclay, CNRS, University Paris-Sud, University Paris-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Fred Beisson
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
| | - Gilles Peltier
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
| | - Yonghua Li-Beisson
- Aix Marseille University, CEA, CNRS, BIAM, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, F-13108 Saint Paul-Lez-Durance, France
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Pérez-Pérez ME, Mauriès A, Maes A, Tourasse NJ, Hamon M, Lemaire SD, Marchand CH. The Deep Thioredoxome in Chlamydomonas reinhardtii: New Insights into Redox Regulation. MOLECULAR PLANT 2017; 10:1107-1125. [PMID: 28739495 DOI: 10.1016/j.molp.2017.07.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 07/04/2017] [Accepted: 07/11/2017] [Indexed: 05/20/2023]
Abstract
Thiol-based redox post-translational modifications have emerged as important mechanisms of signaling and regulation in all organisms, and thioredoxin plays a key role by controlling the thiol-disulfide status of target proteins. Recent redox proteomic studies revealed hundreds of proteins regulated by glutathionylation and nitrosylation in the unicellular green alga Chlamydomonas reinhardtii, while much less is known about the thioredoxin interactome in this organism. By combining qualitative and quantitative proteomic analyses, we have comprehensively investigated the Chlamydomonas thioredoxome and 1188 targets have been identified. They participate in a wide range of metabolic pathways and cellular processes. This study broadens not only the redox regulation to new enzymes involved in well-known thioredoxin-regulated metabolic pathways but also sheds light on cellular processes for which data supporting redox regulation are scarce (aromatic amino acid biosynthesis, nuclear transport, etc). Moreover, we characterized 1052 thioredoxin-dependent regulatory sites and showed that these data constitute a valuable resource for future functional studies in Chlamydomonas. By comparing this thioredoxome with proteomic data for glutathionylation and nitrosylation at the protein and cysteine levels, this work confirms the existence of a complex redox regulation network in Chlamydomonas and provides evidence of a tremendous selectivity of redox post-translational modifications for specific cysteine residues.
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Affiliation(s)
- María Esther Pérez-Pérez
- Institut de Biologie Physico-Chimique, UMR8226, CNRS, Sorbonne Universités, UPMC Univ Paris 06, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Adeline Mauriès
- Institut de Biologie Physico-Chimique, UMR8226, CNRS, Sorbonne Universités, UPMC Univ Paris 06, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Alexandre Maes
- Institut de Biologie Physico-Chimique, UMR8226, CNRS, Sorbonne Universités, UPMC Univ Paris 06, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Nicolas J Tourasse
- Institut de Biologie Physico-Chimique, Plateforme de Protéomique, FRC550, CNRS, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Marion Hamon
- Institut de Biologie Physico-Chimique, UMR8226, CNRS, Sorbonne Universités, UPMC Univ Paris 06, 13 rue Pierre et Marie Curie, 75005 Paris, France; Institut de Biologie Physico-Chimique, Plateforme de Protéomique, FRC550, CNRS, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Stéphane D Lemaire
- Institut de Biologie Physico-Chimique, UMR8226, CNRS, Sorbonne Universités, UPMC Univ Paris 06, 13 rue Pierre et Marie Curie, 75005 Paris, France.
| | - Christophe H Marchand
- Institut de Biologie Physico-Chimique, UMR8226, CNRS, Sorbonne Universités, UPMC Univ Paris 06, 13 rue Pierre et Marie Curie, 75005 Paris, France; Institut de Biologie Physico-Chimique, Plateforme de Protéomique, FRC550, CNRS, 13 rue Pierre et Marie Curie, 75005 Paris, France.
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Uhmeyer A, Cecchin M, Ballottari M, Wobbe L. Impaired Mitochondrial Transcription Termination Disrupts the Stromal Redox Poise in Chlamydomonas. PLANT PHYSIOLOGY 2017; 174:1399-1419. [PMID: 28500267 PMCID: PMC5490881 DOI: 10.1104/pp.16.00946] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 05/10/2017] [Indexed: 05/16/2023]
Abstract
In photosynthetic eukaryotes, the metabolite exchange between chloroplast and mitochondria ensures efficient photosynthesis under saturating light conditions. The Chlamydomonas reinhardtii mutant stm6 is devoid of the mitochondrial transcription termination factor MOC1 and aberrantly expresses the mitochondrial genome, resulting in enhanced photosynthetic hydrogen production and diminished light tolerance. We analyzed the modulation of mitochondrial and chlororespiration during the acclimation of stm6 and the MOC1-complemented strain to excess light. Although light stress stimulated mitochondrial respiration via the energy-conserving cytochrome c pathway in both strains, the mutant was unable to fine-tune the expression and activity of oxidative phosphorylation complex I in excess light, which was accompanied by an increased mitochondrial respiration via the alternative oxidase pathway. Furthermore, stm6 failed to fully activate chlororespiration and cyclic electron flow due to a more oxidized state of the chloroplast stroma, which is caused by an increased mitochondrial electron sink capacity. Increased susceptibility to photoinhibition of PSII in stm6 demonstrates that the MOC1-dependent modulation of mitochondrial respiration helps control the stromal redox poise as a crucial part of high-light acclimation in C. reinhardtii.
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Affiliation(s)
- Andreas Uhmeyer
- Bielefeld University, Faculty of Biology, Center for Biotechnology, 33615 Bielefeld, Germany
| | - Michela Cecchin
- Universita degli Studi di Verona, Department of Biotechnology, 37134 Verona, Italy
| | - Matteo Ballottari
- Universita degli Studi di Verona, Department of Biotechnology, 37134 Verona, Italy
| | - Lutz Wobbe
- Bielefeld University, Faculty of Biology, Center for Biotechnology, 33615 Bielefeld, Germany
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Alric J, Johnson X. Alternative electron transport pathways in photosynthesis: a confluence of regulation. CURRENT OPINION IN PLANT BIOLOGY 2017; 37:78-86. [PMID: 28426976 DOI: 10.1016/j.pbi.2017.03.014] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/23/2017] [Accepted: 03/28/2017] [Indexed: 05/19/2023]
Abstract
Photosynthetic reactions proceed along a linear electron transfer chain linking water oxidation at photosystem II (PSII) to CO2 reduction in the Calvin-Benson-Bassham cycle. Alternative pathways poise the electron carriers along the chain in response to changing light, temperature and CO2 inputs, under prolonged hydration stress and during development. We describe recent literature that reports the physiological functions of new molecular players. Such highlights include the flavodiiron proteins and their important role in the green lineage. The parsing of the proton-motive force between ΔpH and Δψ, regulated in many different ways (cyclic electron flow, ATPsynthase conductivity, ion/H+ transporters), is comprehensively reported. This review focuses on an integrated description of alternative electron transfer pathways and how they contribute to photosynthetic productivity in the context of plant fitness to the environment.
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Affiliation(s)
- Jean Alric
- CEA, CNRS, Aix-Marseille Université, Institut de Biosciences et Biotechnologies Aix-Marseille, UMR 7265, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, CEA Cadarache, Saint-Paul-lez-Durance F-13108, France
| | - Xenie Johnson
- CEA, CNRS, Aix-Marseille Université, Institut de Biosciences et Biotechnologies Aix-Marseille, UMR 7265, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, CEA Cadarache, Saint-Paul-lez-Durance F-13108, France.
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15
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Gütle DD, Roret T, Hecker A, Reski R, Jacquot JP. Dithiol disulphide exchange in redox regulation of chloroplast enzymes in response to evolutionary and structural constraints. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2017; 255:1-11. [PMID: 28131337 DOI: 10.1016/j.plantsci.2016.11.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 11/04/2016] [Accepted: 11/05/2016] [Indexed: 05/27/2023]
Abstract
Redox regulation of chloroplast enzymes via disulphide reduction is believed to control the rates of CO2 fixation. The study of the thioredoxin reduction pathways and of various target enzymes lead to the following guidelines.
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Affiliation(s)
- Desirée D Gütle
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-lès-Nancy, France; INRA, UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France; Plant Biotechnology, Faculty of Biology, University of Freiburg, Schänzlestr. 1, 79104 Freiburg, Germany; Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104 Freiburg, Germany.
| | - Thomas Roret
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-lès-Nancy, France; INRA, UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France
| | - Arnaud Hecker
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-lès-Nancy, France; INRA, UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France
| | - Ralf Reski
- Plant Biotechnology, Faculty of Biology, University of Freiburg, Schänzlestr. 1, 79104 Freiburg, Germany; Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104 Freiburg, Germany; BIOSS - Centre for Biological Signalling Studies, University of Freiburg, Schänzlestr. 18, 79104 Freiburg, Germany
| | - Jean-Pierre Jacquot
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-lès-Nancy, France; INRA, UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France.
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16
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Gütle DD, Roret T, Müller SJ, Couturier J, Lemaire SD, Hecker A, Dhalleine T, Buchanan BB, Reski R, Einsle O, Jacquot JP. Chloroplast FBPase and SBPase are thioredoxin-linked enzymes with similar architecture but different evolutionary histories. Proc Natl Acad Sci U S A 2016; 113:6779-84. [PMID: 27226308 PMCID: PMC4914176 DOI: 10.1073/pnas.1606241113] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The Calvin-Benson cycle of carbon dioxide fixation in chloroplasts is controlled by light-dependent redox reactions that target specific enzymes. Of the regulatory members of the cycle, our knowledge of sedoheptulose-1,7-bisphosphatase (SBPase) is particularly scanty, despite growing evidence for its importance and link to plant productivity. To help fill this gap, we have purified, crystallized, and characterized the recombinant form of the enzyme together with the better studied fructose-1,6-bisphosphatase (FBPase), in both cases from the moss Physcomitrella patens (Pp). Overall, the moss enzymes resembled their counterparts from seed plants, including oligomeric organization-PpSBPase is a dimer, and PpFBPase is a tetramer. The two phosphatases showed striking structural homology to each other, differing primarily in their solvent-exposed surface areas in a manner accounting for their specificity for seven-carbon (sedoheptulose) and six-carbon (fructose) sugar bisphosphate substrates. The two enzymes had a similar redox potential for their regulatory redox-active disulfides (-310 mV for PpSBPase vs. -290 mV for PpFBPase), requirement for Mg(2+) and thioredoxin (TRX) specificity (TRX f > TRX m). Previously known to differ in the position and sequence of their regulatory cysteines, the enzymes unexpectedly showed unique evolutionary histories. The FBPase gene originated in bacteria in conjunction with the endosymbiotic event giving rise to mitochondria, whereas SBPase arose from an archaeal gene resident in the eukaryotic host. These findings raise the question of how enzymes with such different evolutionary origins achieved structural similarity and adapted to control by the same light-dependent photosynthetic mechanism-namely ferredoxin, ferredoxin-thioredoxin reductase, and thioredoxin.
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Affiliation(s)
- Desirée D Gütle
- Plant Biotechnology, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany; Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France; Spemann Graduate School of Biology and Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Thomas Roret
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France
| | - Stefanie J Müller
- Plant Biotechnology, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Jérémy Couturier
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France
| | - Stéphane D Lemaire
- Sorbonne Universités, Université Pierre et Marie Curie (UPMC) Université Paris 6, CNRS UMR 8226, Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, Institut de Biologie Physico-Chimique, 75005 Paris, France
| | - Arnaud Hecker
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France
| | - Tiphaine Dhalleine
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France
| | - Bob B Buchanan
- Department of Plant & Microbial Biology, University of California, Berkeley, CA 94720-3102;
| | - Ralf Reski
- Plant Biotechnology, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany; Spemann Graduate School of Biology and Medicine, University of Freiburg, 79104 Freiburg, Germany; Centre for Biological Signalling Studies (BIOSS), 79104 Freiburg, Germany; Freiburg Institute for Advanced Studies (FRIAS), 79104 Freiburg, Germany
| | - Oliver Einsle
- Spemann Graduate School of Biology and Medicine, University of Freiburg, 79104 Freiburg, Germany; Centre for Biological Signalling Studies (BIOSS), 79104 Freiburg, Germany; Freiburg Institute for Advanced Studies (FRIAS), 79104 Freiburg, Germany; Institute for Biochemistry, University of Freiburg, 79104 Freiburg, Germany
| | - Jean-Pierre Jacquot
- Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France;
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Arts IS, Vertommen D, Baldin F, Laloux G, Collet JF. Comprehensively Characterizing the Thioredoxin Interactome In Vivo Highlights the Central Role Played by This Ubiquitous Oxidoreductase in Redox Control. Mol Cell Proteomics 2016; 15:2125-40. [PMID: 27081212 DOI: 10.1074/mcp.m115.056440] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Indexed: 12/12/2022] Open
Abstract
Thioredoxin (Trx) is a ubiquitous oxidoreductase maintaining protein-bound cysteine residues in the reduced thiol state. Here, we combined a well-established method to trap Trx substrates with the power of bacterial genetics to comprehensively characterize the in vivo Trx redox interactome in the model bacterium Escherichia coli Using strains engineered to optimize trapping, we report the identification of a total 268 Trx substrates, including 201 that had never been reported to depend on Trx for reduction. The newly identified Trx substrates are involved in a variety of cellular processes, ranging from energy metabolism to amino acid synthesis and transcription. The interaction between Trx and two of its newly identified substrates, a protein required for the import of most carbohydrates, PtsI, and the bacterial actin homolog MreB was studied in detail. We provide direct evidence that PtsI and MreB contain cysteine residues that are susceptible to oxidation and that participate in the formation of an intermolecular disulfide with Trx. By considerably expanding the number of Trx targets, our work highlights the role played by this major oxidoreductase in a variety of cellular processes. Moreover, as the dependence on Trx for reduction is often conserved across species, it also provides insightful information on the interactome of Trx in organisms other than E. coli.
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Affiliation(s)
- Isabelle S Arts
- From the ‡WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium, §de Duve Institute, Université catholique de Louvain (UCL), Avenue Hippocrate 75, 1200 Brussels, Belgium; ¶Brussels Center for Redox Biology, Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Didier Vertommen
- §de Duve Institute, Université catholique de Louvain (UCL), Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Francesca Baldin
- From the ‡WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium, §de Duve Institute, Université catholique de Louvain (UCL), Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Géraldine Laloux
- From the ‡WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium, §de Duve Institute, Université catholique de Louvain (UCL), Avenue Hippocrate 75, 1200 Brussels, Belgium; ¶Brussels Center for Redox Biology, Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Jean-François Collet
- From the ‡WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium, §de Duve Institute, Université catholique de Louvain (UCL), Avenue Hippocrate 75, 1200 Brussels, Belgium; ¶Brussels Center for Redox Biology, Avenue Hippocrate 75, 1200 Brussels, Belgium
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An Y, Cao Y, Xu Y. Purification and characterization of the plastid-localized NAD-dependent malate dehydrogenase from Arabidopsis thaliana. Biotechnol Appl Biochem 2015; 63:490-6. [PMID: 26095832 DOI: 10.1002/bab.1406] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 06/04/2015] [Indexed: 11/11/2022]
Abstract
Malate dehydrogenase (MDH) ubiquitously exists in living organisms and has many isoforms in a single species. MDHs from some classes have been characterized for their catalytic properties, which show significant variations despite that they share high sequence identity for the active sites. One class MDH, the plastid-localized NAD-dependent MDH (plNAD-MDH) is known to be important for plant survival in a dark environment, but its biochemical and enzymatic properties have not been well characterized. This study attempts to fill the gap. plNAD-MDH was expressed in an Escherichia coli system and purified using nickel-affinity chromatography followed by size exclusion chromatography. The N-terminal fusion his-tag was removed by protease cleavage. The gel filtration assay and glutaraldehyde cross-linking results showed that the active enzyme was a homodimer in solution. Further assay indicated that plNAD-MDH is most active at a neutral pH value. The Km values for oxaloacetate and NADH are found in the submillimolar order, a median range for most MDHs. The maximum reaction rate values, however, are dramatically different from other plant MDHs, indicating that plNAD-MDH has different substrate specificity. Moreover, we obtained crystals for this enzyme, which laid the groundwork for further analysis of the enzymatic mechanism from structural stand point.
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Affiliation(s)
- Yan An
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Lin'an, Zhejiang, People's Republic of China
| | - Youzhi Cao
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Lin'an, Zhejiang, People's Republic of China
| | - Yingwu Xu
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Lin'an, Zhejiang, People's Republic of China
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Pérez-Pérez ME, Zaffagnini M, Marchand CH, Crespo JL, Lemaire SD. The yeast autophagy protease Atg4 is regulated by thioredoxin. Autophagy 2014; 10:1953-64. [PMID: 25483965 DOI: 10.4161/auto.34396] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Autophagy is a membrane-trafficking process whereby double-membrane vesicles called autophagosomes engulf and deliver intracellular material to the vacuole for degradation. Atg4 is a cysteine protease with an essential function in autophagosome formation. Mounting evidence suggests that reactive oxygen species may play a role in the control of autophagy and could regulate Atg4 activity but the precise mechanisms remain unclear. In this study, we showed that reactive oxygen species activate autophagy in the model yeast Saccharomyces cerevisiae and unraveled the molecular mechanism by which redox balance controls Atg4 activity. A combination of biochemical assays, redox titrations, and site-directed mutagenesis revealed that Atg4 is regulated by oxidoreduction of a single disulfide bond between Cys338 and Cys394. This disulfide has a low redox potential and is very efficiently reduced by thioredoxin, suggesting that this oxidoreductase plays an important role in Atg4 regulation. Accordingly, we found that autophagy activation by rapamycin was more pronounced in a thioredoxin mutant compared with wild-type cells. Moreover, in vivo studies indicated that Cys338 and Cys394 are required for the proper regulation of autophagosome biogenesis, since mutation of these cysteines resulted in increased recruitment of Atg8 to the phagophore assembly site. Thus, we propose that the fine-tuning of Atg4 activity depending on the intracellular redox state may regulate autophagosome formation.
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Key Words
- ATG, autophagy-related
- Ape1, aminopeptidase I
- Asc, ascorbate
- Atg4
- Cvt, cytoplasm-to-vacuole targeting
- DTNB, 5, 5′-dithiobis (2-nitro-benzoic acid)
- DTT, dithiothreitol
- DTTox, oxidized DTT
- DTTred, reduced DTT
- Eh, redox potential
- Em, midpoint redox potential
- GSH, reduced glutathione
- GSNO, S-nitrosoglutathione
- GSSG, oxidized glutathione
- Gsr, glutathione reductase
- IAM, iodoacetamide
- NEM, N-ethylmaleimide
- PAS, phagophore assembly site
- PE, phosphatidylethanolamine
- PTM, post-translational modification
- ROS, reactive oxygen species
- SD, synthetic minimal medium
- Trr1, thioredoxin reductase 1
- Trx1, thioredoxin 1
- YPD, yeast peptone dextrose
- autophagy
- phagophore assembly site
- rap, rapamycin
- redox regulation
- thioredoxin
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Affiliation(s)
- María Esther Pérez-Pérez
- a Centre National de la Recherche Scientifique; UMR8226; Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes; Institut de Biologie Physico-Chimique ; Paris , France
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20
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Morisse S, Zaffagnini M, Gao XH, Lemaire SD, Marchand CH. Insight into protein S-nitrosylation in Chlamydomonas reinhardtii. Antioxid Redox Signal 2014; 21:1271-84. [PMID: 24328795 PMCID: PMC4158989 DOI: 10.1089/ars.2013.5632] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIMS Protein S-nitrosylation, a post-translational modification (PTM) consisting of the covalent binding of nitric oxide (NO) to a cysteine thiol moiety, plays a major role in cell signaling and is recognized to be involved in numerous physiological processes and diseases in mammals. The importance of nitrosylation in photosynthetic eukaryotes has been less studied. The aim of this study was to expand our knowledge on protein nitrosylation by performing a large-scale proteomic analysis of proteins undergoing nitrosylation in vivo in Chlamydomonas reinhardtii cells under nitrosative stress. RESULTS Using two complementary proteomic approaches, 492 nitrosylated proteins were identified. They participate in a wide range of biological processes and pathways, including photosynthesis, carbohydrate metabolism, amino acid metabolism, translation, protein folding or degradation, cell motility, and stress. Several proteins were confirmed in vitro by western blot, site-directed mutagenesis and activity measurements. Moreover, 392 sites of nitrosylation were also identified. These results strongly suggest that S-nitrosylation could constitute a major mechanism of regulation in C. reinhardtii under nitrosative stress conditions. INNOVATION This study constitutes the largest proteomic analysis of protein nitrosylation reported to date. CONCLUSION The identification of 381 previously unrecognized targets of nitrosylation further extends our knowledge on the importance of this PTM in photosynthetic eukaryotes. The data have been deposited to the ProteomeXchange repository with identifier PXD000569.
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Affiliation(s)
- Samuel Morisse
- 1 Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie Curie , Paris, France
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21
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Cheng F, Zhou YH, Xia XJ, Shi K, Zhou J, Yu JQ. Chloroplastic thioredoxin-f and thioredoxin-m1/4 play important roles in brassinosteroids-induced changes in CO2 assimilation and cellular redox homeostasis in tomato. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4335-47. [PMID: 24847092 PMCID: PMC4112637 DOI: 10.1093/jxb/eru207] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Chloroplast thioredoxins (TRXs) and glutathione function as redox messengers in the regulation of photosynthesis. In this work, the roles of chloroplast TRXs in brassinosteroids (BRs)-induced changes in cellular redox homeostasis and CO2 assimilation were studied in the leaves of tomato plants. BRs-deficient d (^im) plants showed decreased transcripts of TRX-f, TRX-m2, TRX-m1/4, and TRX-x, while exogenous BRs significantly induced CO2 assimilation and the expression of TRX-f, TRX-m2, TRX-m1/4, and TRX-x. Virus-induced gene silencing (VIGS) of the chloroplast TRX-f, TRX-m2, TRX-m1/4, and TRX-y genes individually increased membrane lipid peroxidation and accumulation of 2-Cys peroxiredoxin dimers, and decreased the activities of the ascorbate-glutathione cycle enzymes and the ratio of reduced glutathione to oxidized glutathione (GSH/GSSG) in the leaves. Furthermore, partial silencing of TRX-f, TRX-m2, TRX-m1/4, and TRX-y resulted in decreased expression of genes involved in the Benson-Calvin cycle and decreased activity of the associated enzymes. Importantly, the BRs-induced increase in CO2 assimilation and the increased expression and activities of antioxidant- and photosynthesis-related genes and enzymes were compromised in the partially TRX-f- and TRX-m1/4-silenced plants. All of these results suggest that TRX-f and TRX-m1/4 are involved in the BRs-induced changes in CO2 assimilation and cellular redox homeostasis in tomato.
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Affiliation(s)
- Fei Cheng
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, PR China
| | - Yan-Hong Zhou
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, PR China
| | - Xiao-Jian Xia
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, PR China
| | - Kai Shi
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, PR China
| | - Jie Zhou
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, PR China
| | - Jing-Quan Yu
- Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058, PR China Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Yuhangtang Road 866, Hangzhou, 310058, PR China
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Zaffagnini M, Michelet L, Sciabolini C, Di Giacinto N, Morisse S, Marchand CH, Trost P, Fermani S, Lemaire SD. High-resolution crystal structure and redox properties of chloroplastic triosephosphate isomerase from Chlamydomonas reinhardtii. MOLECULAR PLANT 2014; 7:101-20. [PMID: 24157611 DOI: 10.1093/mp/sst139] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Triosephosphate isomerase (TPI) catalyzes the interconversion of glyceraldehyde-3-phosphate to dihydroxyacetone phosphate. Photosynthetic organisms generally contain two isoforms of TPI located in both cytoplasm and chloroplasts. While the cytoplasmic TPI is involved in the glycolysis, the chloroplastic isoform participates in the Calvin-Benson cycle, a key photosynthetic process responsible for carbon fixation. Compared with its cytoplasmic counterpart, the functional features of chloroplastic TPI have been poorly investigated and its three-dimensional structure has not been solved. Recently, several studies proposed TPI as a potential target of different redox modifications including dithiol/disulfide interchanges, glutathionylation, and nitrosylation. However, neither the effects on protein activity nor the molecular mechanisms underlying these redox modifications have been investigated. Here, we have produced recombinantly and purified TPI from the unicellular green alga Chlamydomonas reinhardtii (Cr). The biochemical properties of the enzyme were delineated and its crystallographic structure was determined at a resolution of 1.1 Å. CrTPI is a homodimer with subunits containing the typical (β/α)8-barrel fold. Although no evidence for TRX regulation was obtained, CrTPI was found to undergo glutathionylation by oxidized glutathione and trans-nitrosylation by nitrosoglutathione, confirming its sensitivity to multiple redox modifications.
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Affiliation(s)
- Mirko Zaffagnini
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Institut de Biologie Physico-Chimique, 13 rue Pierre et Marie Curie, 75005 Paris, France
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Michelet L, Zaffagnini M, Morisse S, Sparla F, Pérez-Pérez ME, Francia F, Danon A, Marchand CH, Fermani S, Trost P, Lemaire SD. Redox regulation of the Calvin-Benson cycle: something old, something new. FRONTIERS IN PLANT SCIENCE 2013; 4:470. [PMID: 24324475 PMCID: PMC3838966 DOI: 10.3389/fpls.2013.00470] [Citation(s) in RCA: 266] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 10/30/2013] [Indexed: 05/18/2023]
Abstract
Reversible redox post-translational modifications such as oxido-reduction of disulfide bonds, S-nitrosylation, and S-glutathionylation, play a prominent role in the regulation of cell metabolism and signaling in all organisms. These modifications are mainly controlled by members of the thioredoxin and glutaredoxin families. Early studies in photosynthetic organisms have identified the Calvin-Benson cycle, the photosynthetic pathway responsible for carbon assimilation, as a redox regulated process. Indeed, 4 out of 11 enzymes of the cycle were shown to have a low activity in the dark and to be activated in the light through thioredoxin-dependent reduction of regulatory disulfide bonds. The underlying molecular mechanisms were extensively studied at the biochemical and structural level. Unexpectedly, recent biochemical and proteomic studies have suggested that all enzymes of the cycle and several associated regulatory proteins may undergo redox regulation through multiple redox post-translational modifications including glutathionylation and nitrosylation. The aim of this review is to detail the well-established mechanisms of redox regulation of Calvin-Benson cycle enzymes as well as the most recent reports indicating that this pathway is tightly controlled by multiple interconnected redox post-translational modifications. This redox control is likely allowing fine tuning of the Calvin-Benson cycle required for adaptation to varying environmental conditions, especially during responses to biotic and abiotic stresses.
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Affiliation(s)
- Laure Michelet
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie CurieParis, France
| | - Mirko Zaffagnini
- Laboratory of Plant Redox Biology, Department of Pharmacy and Biotechnology (FaBiT), University of BolognaBologna, Italy
| | - Samuel Morisse
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie CurieParis, France
| | - Francesca Sparla
- Laboratory of Plant Redox Biology, Department of Pharmacy and Biotechnology (FaBiT), University of BolognaBologna, Italy
| | - María Esther Pérez-Pérez
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie CurieParis, France
| | - Francesco Francia
- Laboratory of Plant Redox Biology, Department of Pharmacy and Biotechnology (FaBiT), University of BolognaBologna, Italy
| | - Antoine Danon
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie CurieParis, France
| | - Christophe H. Marchand
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie CurieParis, France
| | - Simona Fermani
- Department of Chemistry “G. Ciamician”, University of BolognaBologna, Italy
| | - Paolo Trost
- Laboratory of Plant Redox Biology, Department of Pharmacy and Biotechnology (FaBiT), University of BolognaBologna, Italy
| | - Stéphane D. Lemaire
- Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, FRE3354 Centre National de la Recherche Scientifique, Institut de Biologie Physico-Chimique, Université Pierre et Marie CurieParis, France
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Peden EA, Boehm M, Mulder DW, Davis R, Old WM, King PW, Ghirardi ML, Dubini A. Identification of global ferredoxin interaction networks in Chlamydomonas reinhardtii. J Biol Chem 2013; 288:35192-209. [PMID: 24100040 DOI: 10.1074/jbc.m113.483727] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ferredoxins (FDXs) can distribute electrons originating from photosynthetic water oxidation, fermentation, and other reductant-generating pathways to specific redox enzymes in different organisms. The six FDXs identified in Chlamydomonas reinhardtii are not fully characterized in terms of their biological function. In this report, we present data from the following: (a) yeast two-hybrid screens, identifying interaction partners for each Chlamydomonas FDX; (b) pairwise yeast two-hybrid assays measuring FDX interactions with proteins from selected biochemical pathways; (c) affinity pulldown assays that, in some cases, confirm and even expand the interaction network for FDX1 and FDX2; and (d) in vitro NADP(+) reduction and H2 photo-production assays mediated by each FDX that verify their role in these two pathways. Our results demonstrate new potential roles for FDX1 in redox metabolism and carbohydrate and fatty acid biosynthesis, for FDX2 in anaerobic metabolism, and possibly in state transition. Our data also suggest that FDX3 is involved in nitrogen assimilation, FDX4 in glycolysis and response to reactive oxygen species, and FDX5 in hydrogenase maturation. Finally, we provide experimental evidence that FDX1 serves as the primary electron donor to two important biological pathways, NADPH and H2 photo-production, whereas FDX2 is capable of driving these reactions at less than half the rate observed for FDX1.
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Affiliation(s)
- Erin A Peden
- From the National Renewable Energy Laboratory, Golden, Colorado 80401 and
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25
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Balsera M, Uberegui E, Susanti D, Schmitz RA, Mukhopadhyay B, Schürmann P, Buchanan BB. Ferredoxin:thioredoxin reductase (FTR) links the regulation of oxygenic photosynthesis to deeply rooted bacteria. PLANTA 2013; 237:619-635. [PMID: 23223880 DOI: 10.1007/s00425-012-1803-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 10/26/2012] [Indexed: 06/01/2023]
Abstract
Uncovered in studies on photosynthesis 35 years ago, redox regulation has been extended to all types of living cells. We understand a great deal about the occurrence, function, and mechanism of action of this mode of regulation, but we know little about its origin and its evolution. To help fill this gap, we have taken advantage of available genome sequences that make it possible to trace the phylogenetic roots of members of the system that was originally described for chloroplasts-ferredoxin, ferredoxin:thioredoxin reductase (FTR), and thioredoxin as well as target enzymes. The results suggest that: (1) the catalytic subunit, FTRc, originated in deeply rooted microaerophilic, chemoautotrophic bacteria where it appears to function in regulating CO(2) fixation by the reverse citric acid cycle; (2) FTRc was incorporated into oxygenic photosynthetic organisms without significant structural change except for addition of a variable subunit (FTRv) seemingly to protect the Fe-S cluster against oxygen; (3) new Trxs and target enzymes were systematically added as evolution proceeded from bacteria through the different types of oxygenic photosynthetic organisms; (4) an oxygenic type of regulation preceded classical light-dark regulation in the regulation of enzymes of CO(2) fixation by the Calvin-Benson cycle; (5) FTR is not universally present in oxygenic photosynthetic organisms, and in certain early representatives is seemingly functionally replaced by NADP-thioredoxin reductase; and (6) FTRc underwent structural diversification to meet the ecological needs of a variety of bacteria and archaea.
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Affiliation(s)
- Monica Balsera
- Instituto de Recursos Naturales y Agrobiología de Salamanca, Salamanca, Spain.
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26
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Bosco MB, Aleanzi MC, Iglesias AÁ. Plastidic phosphoglycerate kinase from Phaeodactylum tricornutum: on the critical role of cysteine residues for the enzyme function. Protist 2011; 163:188-203. [PMID: 21816671 DOI: 10.1016/j.protis.2011.07.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Accepted: 06/23/2011] [Indexed: 11/15/2022]
Abstract
Chloroplastidic phosphoglycerate kinase (PGKase) plays a key role in photosynthetic organisms, catalyzing a key step in the Calvin cycle. We performed the molecular cloning of the gene encoding chloroplastidic PGKase-1 in the diatom Phaeodactylum tricornutum. The recombinant enzyme was expressed in Escherichia coli, purified and characterized. Afterward, it showed similar kinetic properties than the enzyme studied from other organisms, although the diatom enzyme displayed distinctive responses to sulfhydryl reagents. The activity of the enzyme was found to be dependent on the redox status in the environment, determined by different compounds, including some of physiological function. Treatment with oxidant agents, such as diamide, hydrogen peroxide, glutathione and sodium nitroprusside resulted in enzyme inhibition. Recovery of activity was possible by subsequent incubation with reducing reagents such as dithiothreitol and thioredoxins (from E. coli and P. tricornutum). We determined two midpoint potentials of different regulatory redox centers, both values indicating that PGKase-1 might be sensitive to changes in the intracellular redox environment. The role of all the six Cys residues found in the diatom enzyme was analyzed by molecular modeling and site-directed mutagenesis. Results suggest key regulatory properties for P. tricornutum PGKase-1, which could be relevant for the functioning of photosynthetic carbon metabolism in diatoms.
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Affiliation(s)
- María Belén Bosco
- Laboratorio de Enzimología Molecular, Instituto de Agrobiotecnología del Litoral (IAL, CONICET-UNL), Facultad de Bioquímica y Ciencias Biológicas, Paraje "El Pozo", CC 242, S3000ZAA Santa Fe, Argentina
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27
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Engineering the nucleotide coenzyme specificity and sulfhydryl redox sensitivity of two stress-responsive aldehyde dehydrogenase isoenzymes of Arabidopsis thaliana. Biochem J 2011; 434:459-71. [PMID: 21166653 DOI: 10.1042/bj20101337] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Lipid peroxidation is one of the consequences of environmental stress in plants and leads to the accumulation of highly toxic, reactive aldehydes. One of the processes to detoxify these aldehydes is their oxidation into carboxylic acids catalyzed by NAD(P)+-dependent ALDHs (aldehyde dehydrogenases). We investigated kinetic parameters of two Arabidopsis thaliana family 3 ALDHs, the cytosolic ALDH3H1 and the chloroplastic isoform ALDH3I1. Both enzymes had similar substrate specificity and oxidized saturated aliphatic aldehydes. Catalytic efficiencies improved with the increase of carbon chain length. Both enzymes were also able to oxidize α,β-unsaturated aldehydes, but not aromatic aldehydes. Activity of ALDH3H1 was NAD+-dependent, whereas ALDH3I1 was able to use NAD+ and NADP+. An unusual isoleucine residue within the coenzyme-binding cleft was responsible for the NAD+-dependence of ALDH3H1. Engineering the coenzyme-binding environment of ALDH3I1 elucidated the influence of the surrounding amino acids. Enzyme activities of both ALDHs were redox-sensitive. Inhibition was correlated with oxidation of both catalytic and non-catalytic cysteine residues in addition to homodimer formation. Dimerization and inactivation could be reversed by reducing agents. Mutant analysis showed that cysteine residues mediating homodimerization are located in the N-terminal region. Modelling of the protein structures revealed that the redox-sensitive cysteine residues are located at the surfaces of the subunits.
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Wang X, Ling S, Zhao D, Sun Q, Li Q, Wu F, Nie J, Qu L, Wang B, Shen X, Bai Y, Li Y, Li Y. Redox regulation of actin by thioredoxin-1 is mediated by the interaction of the proteins via cysteine 62. Antioxid Redox Signal 2010; 13:565-73. [PMID: 20218863 DOI: 10.1089/ars.2009.2833] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Actin is a highly conserved protein in eukaryotic cells, and has been identified as one of the main redox targets by redox proteomics under oxidative stress. However, little is known about the mechanisms of regulation of the redox state of actin. In this study, we investigated how thioredoxin-1 (Trx1) affected the redox state of actin and its polymerization under oxidative stress in SH-SY5Y cells. Trx1 decreased the levels of reactive oxygen species (ROS) in the cells, and cysteine residues at positions 32, 35, and 69 of the Trx1 protein were active sites for redox regulation. Actin could be kept in a reduced state by Trx1 under H(2)O(2) stimulation. A physical interaction was found to exist between actin and Trx1. Cysteine 62 in Trx1 was the key site that interacted with actin, and it was required to maintain cellular viability and anti-apoptotic function. Taken together, these results suggested that Trx1 could protect cells from apoptosis under oxidative stress not only by increasing the total antioxidant capability and decreasing the ROS levels, but also by stabilizing the actin cytoskeletal system, which cooperatively contributed to the enhancement of cell viability and worked against apoptosis.
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Affiliation(s)
- Xiaogang Wang
- Department of Cellular and Molecular Biology, State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
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29
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Chibani K, Couturier J, Selles B, Jacquot JP, Rouhier N. The chloroplastic thiol reducing systems: dual functions in the regulation of carbohydrate metabolism and regeneration of antioxidant enzymes, emphasis on the poplar redoxin equipment. PHOTOSYNTHESIS RESEARCH 2010; 104:75-99. [PMID: 19902380 DOI: 10.1007/s11120-009-9501-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Accepted: 10/12/2009] [Indexed: 05/28/2023]
Abstract
The post-translational modification consisting in the formation/reduction of disulfide bonds has been the subject of intense research in plants since the discovery in the 1970s that many chloroplastic enzymes are regulated by light through dithiol-disulfide exchange reactions catalyzed by oxidoreductases called thioredoxins (Trxs). Further biochemical and proteomic studies have considerably increased the number of target enzymes and processes regulated by these mechanisms in many sub-cellular compartments. Recently, glutathionylation, a modification consisting in the reversible formation of a glutathione adduct on cysteine residues, was proposed as an alternative redox regulation mechanism. Glutaredoxins (Grxs), proteins related to Trxs, are efficient catalysts for deglutathionylation, the opposite reaction. Hence, the Trxs- and Grxs-dependent pathways might constitute complementary and not only redundant regulatory processes. This article focuses on these two multigenic families and associated protein partners in poplar and on their involvement in the regulation of some major chloroplastic processes such as stress response, carbohydrate and heme/chlorophyll metabolism.
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Affiliation(s)
- Kamel Chibani
- Unité Mixte de Recherches 1136 INRA-Nancy Université, Interactions Arbre-Microorganismes IFR 110 EFABA, Vandoeuvre-lès-Nancy Cedex, France
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30
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Marri L, Zaffagnini M, Collin V, Issakidis-Bourguet E, Lemaire SD, Pupillo P, Sparla F, Miginiac-Maslow M, Trost P. Prompt and easy activation by specific thioredoxins of calvin cycle enzymes of Arabidopsis thaliana associated in the GAPDH/CP12/PRK supramolecular complex. MOLECULAR PLANT 2009; 2:259-69. [PMID: 19825612 DOI: 10.1093/mp/ssn061] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The Calvin cycle enzymes glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and phosphoribulokinase (PRK) can form under oxidizing conditions a supramolecular complex with the regulatory protein CP12. Both GAPDH and PRK activities are inhibited within the complex, but they can be fully restored by reduced thioredoxins (TRXs). We have investigated the interactions of eight different chloroplast thioredoxin isoforms (TRX f1, m1, m2, m3, m4, y1, y2, x) with GAPDH (A(4), B(4), and B(8) isoforms), PRK and CP12 (isoform 2), all from Arabidopsis thaliana. In the complex, both A(4)-GAPDH and PRK were promptly activated by TRX f1, or more slowly by TRXs m1 and m2, but all other TRXs were ineffective. Free PRK was regulated by TRX f1, m1, or m2, while B(4)- and B(8)-GAPDH were absolutely specific for TRX f1. Interestingly, reductive activation of PRK caged in the complex was much faster than reductive activation of free oxidized PRK, and activation of A(4)-GAPDH in the complex was much faster (and less demanding in terms of reducing potential) than activation of free oxidized B(4)- or B(8)-GAPDH. It is proposed that CP12-assembled supramolecular complex may represent a reservoir of inhibited enzymes ready to be released in fully active conformation following reduction and dissociation of the complex by TRXs upon the shift from dark to low light. On the contrary, autonomous redox-modulation of GAPDH (B-containing isoforms) would be more suited to conditions of very active photosynthesis.
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Affiliation(s)
- Lucia Marri
- Laboratory of Molecular Plant Physiology, Department of Experimental Evolutionary Biology, University of Bologna, Via Irnerio 42, I-40126 Bologna, Italy
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31
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Shao N, Beck CF, Lemaire SD, Krieger-Liszkay A. Photosynthetic electron flow affects H2O2 signaling by inactivation of catalase in Chlamydomonas reinhardtii. PLANTA 2008; 228:1055-66. [PMID: 18781324 PMCID: PMC2757591 DOI: 10.1007/s00425-008-0807-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Accepted: 08/04/2008] [Indexed: 05/22/2023]
Abstract
A specific signaling role for H(2)O(2) in Chlamydomonas reinhardtii was demonstrated by the definition of a promoter that specifically responded to this ROS. Expression of a nuclear-encoded reporter gene driven by this promoter was shown to depend not only on the level of exogenously added H(2)O(2) but also on light. In the dark, the induction of the reporter gene by H(2)O(2) was much lower than in the light. This lower induction was correlated with an accelerated disappearance of H(2)O(2) from the culture medium in the dark. Due to a light-induced reduction in catalase activity, H(2)O(2) levels in the light remained higher. Photosynthetic electron transport mediated the light-controlled down-regulation of the catalase activity since it was prevented by 3-(3'4'-dichlorophenyl)-1,1-dimethylurea (DCMU), an inhibitor of photosystem II. In the presence of light and DCMU, expression of the reporter gene was low while the addition of aminotriazole, a catalase inhibitor, led to a higher induction of the reporter gene by H(2)O(2) in the dark. The role of photosynthetic electron transport and thioredoxin in this regulation was investigated by using mutants deficient in photosynthetic electron flow and by studying the correlation between NADP-malate dehydrogenase and catalase activities. It is proposed that, contrary to expectations, a controlled down-regulation of catalase activity occurs upon a shift of cells from dark to light. This down-regulation apparently is necessary to maintain a certain level of H(2)O(2) required to activate H(2)O(2)-dependent signaling pathways.
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Affiliation(s)
- Ning Shao
- Fakultät für Biologie, Institut für Biologie III, Universität Freiburg, Schänzlestrasse 1, 79104 Freiburg, Germany
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam/Golm, Germany
| | - Christoph F. Beck
- Fakultät für Biologie, Institut für Biologie III, Universität Freiburg, Schänzlestrasse 1, 79104 Freiburg, Germany
| | - Stéphane D. Lemaire
- Institut de Biotechnologie des Plantes, Centre National de la Recherche Scientifique, Université Paris-Sud, 91405 Orsay Cedex, France
| | - Anja Krieger-Liszkay
- CEA, iBiTecS, CNRS URA 2096, Service de Bioénergétique, Biologie Structurale et Mécanisme, 91191 Gif-sur-Yvette Cedex, France
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Abstract
Forty years ago, ferredoxin (Fdx) was shown to activate fructose 1,6-bisphosphatase in illuminated chloroplast preparations, thereby laying the foundation for the field now known as "redox biology." Enzyme activation was later shown to require the ubiquitous protein thioredoxin (Trx), reduced photosynthetically by Fdx via an enzyme then unknown-ferredoxin:thioredoxin reductase (FTR). These proteins, Fdx, FTR, and Trx, constitute a regulatory ensemble, the "Fdx/Trx system." The redox biology field has since grown beyond all expectations and now embraces a spectrum of processes throughout biology. Progress has been notable with plants that possess not only the plastid Fdx/Trx system, but also the earlier known NADP/Trx system in the cytosol, endoplasmic reticulum, and mitochondria. Plants contain at least 19 types of Trx (nine in chloroplasts). In this review, we focus on the structure and mechanism of action of members of the photosynthetic Fdx/Trx system and on biochemical processes linked to Trx. We also summarize recent evidence that extends the Fdx/Trx system to amyloplasts-heterotrophic plastids functional in the biosynthesis of starch and other cell components. The review highlights the plant as a model system to uncover principles of redox biology that apply to other organisms.
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Affiliation(s)
- Peter Schürmann
- Laboratoire de Biologie Moléculaire et Cellulaire, Université de Neuchâtel, Neuchâtel, Switzerland.
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Shibagaki N, Grossman A. The State of Sulfur Metabolism in Algae: From Ecology to Genomics. SULFUR METABOLISM IN PHOTOTROPHIC ORGANISMS 2008. [DOI: 10.1007/978-1-4020-6863-8_13] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Hameister S, Becker B, Holtgrefe S, Strodtkötter I, Linke V, Backhausen JE, Scheibe R. Transcriptional regulation of NADP-dependent malate dehydrogenase: comparative genetics and identification of DNA-binding proteins. J Mol Evol 2007; 65:437-55. [PMID: 17925997 DOI: 10.1007/s00239-007-9025-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2007] [Revised: 04/21/2007] [Accepted: 07/02/2007] [Indexed: 12/26/2022]
Abstract
The transcriptional regulation of NADP-malate dehydrogenase (NADP-MDH) was analyzed in Arabidopsis ecotypes and other Brassicaceae. The amount of transcript increased twofold after transfer into low temperature (12 degrees C) or high light (750 microE) in all species. Analysis of the genomic DNA reveals that the NADP-MDH gene (At5g58330 in A. thaliana) in Brassicaceae is located between two other genes (At5g58320 and At5g58340 in Arabidopsis), both encoded on the opposite DNA strand. No promoter elements were identified in 5' direction of the NADP-MDH gene, and the expression of NADP-MDH was not affected in knock-out plants carrying a DNA insert in the 5' region. A yeast-one hybrid approach yielded only three DNA-binding proteins for the 500-bp fragment located upstream of the ATG sequence, but 34 proteins for its coding region. However, in Chlamydomonas and in some Poaceae, which do not possess any genes within the 1200 bp upstream region, typical promoter elements were identified. Alignments of genomic DNA reveal that, in contrast to Poaceae, the introns are highly conserved within Brassicaceae. We conclude that in Brassicaceae the majority of regulatory elements are located within the coding region. The NADP-MDH gene of both families evolved from a common precursor, similar to the gene in Chlamydomonas. Changes in the selection pressure allowed the insertion of At5g58340 into the promoter region of a common ancestor. When the demand for transcriptional regulation increased, At5g58340 disappeared in Poaceae, and a promoter developed in the 5' region. In contrast, Brassicaceae maintained At5g58340 and shifted all regulatory elements into the coding region of NADP-MDH.
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Affiliation(s)
- Steffen Hameister
- Pflanzenphysiologie, Fachbereich Biologie/Chemie, Universität Osnabrück, Osnabrück, Germany
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Oesterhelt C, Klocke S, Holtgrefe S, Linke V, Weber APM, Scheibe R. Redox regulation of chloroplast enzymes in Galdieria sulphuraria in view of eukaryotic evolution. PLANT & CELL PHYSIOLOGY 2007; 48:1359-73. [PMID: 17698881 DOI: 10.1093/pcp/pcm108] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Redox modulation is a general mechanism for enzyme regulation, particularly for the post-translational regulation of the Calvin cycle in chloroplasts of green plants. Although red algae and photosynthetic protists that harbor plastids of red algal origin contribute greatly to global carbon fixation, relatively little is known about post-translational regulation of chloroplast enzymes in this important group of photosynthetic eukaryotes. To address this question, we used biochemistry, phylogenetics and analysis of recently completed genome sequences. We studied the functionality of the chloroplast enzymes phosphoribulokinase (PRK, EC 2.7.1.19), NADP-dependent glyceraldehyde 3-phosphate dehydrogenase (NADP-GAPDH, GapA, EC 1.2.1.13), fructose 1,6-bisphosphatase (FBPase, EC 3.1.3.11) and glucose 6-phosphate dehydrogenase (G6PDH, EC 1.1.1.49), as well as NADP-malate dehydrogenase (NADP-MDH, EC 1.1.1.37) in the unicellular red alga Galdieria sulphuraria (Galdieri) Merola. Despite high sequence similarity of G. sulphuraria proteins to those of other photosynthetic organisms, we found a number of distinct differences. Both PRK and GAPDH co-eluted with CP12 in a high molecular weight complex in the presence of oxidized glutathione, although Galdieria CP12 lacks the two cysteines essential for the formation of the N-terminal peptide loop present in higher plants. However, PRK inactivation upon complex formation turned out to be incomplete. G6PDH was redox modulated, but remained in its tetrameric form; FBPase was poorly redox regulated, despite conservation of the two redox-active cysteines. No indication for the presence of plastidic NADP-MDH (and other components of the malate valve) was found.
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Affiliation(s)
- Christine Oesterhelt
- Department of Plant Physiology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str 24-25, D-14476, Potsdam-Golm, Germany
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Lemaire SD, Michelet L, Zaffagnini M, Massot V, Issakidis-Bourguet E. Thioredoxins in chloroplasts. Curr Genet 2007; 51:343-65. [PMID: 17431629 DOI: 10.1007/s00294-007-0128-z] [Citation(s) in RCA: 157] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2007] [Revised: 03/05/2007] [Accepted: 03/09/2007] [Indexed: 01/03/2023]
Abstract
Thioredoxins (TRXs) are small disulfide oxidoreductases of ca. 12 kDa found in all free living organisms. In plants, two chloroplastic TRXs, named TRX f and TRX m, were originally identified as light dependent regulators of several carbon metabolism enzymes including Calvin cycle enzymes. The availability of genome sequences revealed an unsuspected multiplicity of TRXs in photosynthetic eukaryotes, including new chloroplastic TRX types. Moreover, proteomic approaches and focused studies allowed identification of 90 potential chloroplastic TRX targets. Lately, recent studies suggest the existence of a complex interplay between TRXs and other redox regulators such as glutaredoxins (GRXs) or glutathione. The latter is involved in a post-translational modification, named glutathionylation that could be controlled by GRXs. Glutathionylation appears to specifically affect the activity of TRX f and other chloroplastic enzymes and could thereby constitute a previously undescribed regulatory mechanism of photosynthetic metabolism under oxidative stress. After summarizing the initial studies on TRX f and TRX m, this review will focus on the most recent developments with special emphasis on the contributions of genomics and proteomics to the field of TRXs. Finally, new emerging interactions with other redox signaling pathways and perspectives for future studies will also be discussed.
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Affiliation(s)
- Stéphane D Lemaire
- Institut de Biotechnologie des Plantes, Unité Mixte de Recherche 8618, Centre National de la Recherche Scientifique, Univ Paris-Sud, 91405 Orsay Cedex, France.
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Meyer Y, Riondet C, Constans L, Abdelgawwad MR, Reichheld JP, Vignols F. Proteomic profiles of thylakoid membranes and changes in response to iron deficiency. PHOTOSYNTHESIS RESEARCH 2006; 89:179-92. [PMID: 16969715 DOI: 10.1007/s11120-006-9095-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Accepted: 08/14/2006] [Indexed: 05/04/2023]
Abstract
The proteomic profile of thylakoid membranes and the changes induced in that proteome by iron deficiency have been studied by using thylakoid preparations from Beta vulgaris plants grown in hydroponics. Two different 2-D electrophoresis approaches have been used to study these proteomes: isoelectrical focusing followed by SDS PAGE (IEF-SDS PAGE) and blue-native polyacrylamide gel electrophoresis followed by SDS PAGE (BN-SDS PAGE). These techniques resolved approximately 110-140 and 40 polypeptides, respectively. Iron deficiency induced significant changes in the thylakoid sugar beet proteome profiles: the relative amounts of electron transfer protein complexes were reduced, whereas those of proteins participating in leaf carbon fixation-linked reactions were increased. A set of polypeptides, which includes several enzymes related to metabolism, was detected in thylakoid preparations from Fe-deficient Beta vulgaris leaves by using BN-SDS PAGE, suggesting that they may be associated with these thylakoids in vivo. The BN-SDS PAGE technique has been proven to be a better method than IEF-SDS PAGE to resolve highly hydrophobic integral membrane proteins from thylakoid preparations, allowing for the identification of complexes and determination of their polypeptidic components.
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Affiliation(s)
- Yves Meyer
- Génome et dévelopement des plantes, UMR 5096, CNRS-UP-IRD Université, Av P. Alduy, Perpignan Cedex, 66860, France.
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Meyer Y, Riondet C, Constans L, Abdelgawwad MR, Reichheld JP, Vignols F. Evolution of redoxin genes in the green lineage. PHOTOSYNTHESIS RESEARCH 2006; 89:179-192. [PMID: 17031546 DOI: 10.1007/s11120-007-9273-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Accepted: 08/14/2006] [Indexed: 05/20/2023]
Abstract
The availability of the Arabidopsis genome revealed the complexity of the gene families implicated in dithiol disulfide exchanges. Most non-green organisms present less dithiol oxidoreductase genes. The availability of the almost complete genome sequence of rice now allows a systematic search for thioredoxins, glutaredoxins and their reducers. This shows that all redoxin families previously defined for Arabidopsis have members in the rice genome and that all the deduced rice redoxins fall within these families. This establishes that the redoxin classification applies both to dicots and monocots. Nevertheless, within each redoxin type the number of members is not the same in these two higher plants and it is not always possible to define orthologues between rice and Arabidopsis. The sequencing of two unicellular algae (Chlamydomonas and Ostreococcus) genomes are almost finished. This allowed us to follow the origin of the different gene families in the green lineage. It appears that most thioredoxin and glutaredoxin types, their chloroplastic, mitochondrial and cytosolic reducers are always present in these unicellular organisms. Nevertheless, striking differences appear in comparison to higher plant redoxins. Some thioredoxin types are not present in these algal genomes including thioredoxins o, clot and glutaredoxins CCxC. Numerous redoxins, including the cytosolic thioredoxins, do not fit with the corresponding higher plant classification. In addition both algae present a NADPH-dependent thioredoxin reductase with a selenocysteine which is highly similar to the animal thioredoxin reductases, a type of thioredoxin reductase not present in higher plants.
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Affiliation(s)
- Yves Meyer
- Génome et dévelopement des plantes, UMR 5096, CNRS-UP-IRD Université, Av P. Alduy, Perpignan Cedex, 66860, France.
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Issakidis-Bourguet E, Lavergne D, Trivelli X, Decottignies P, Miginiac-Maslow M. Transferring redox regulation properties from sorghum NADP-malate dehydrogenase to Thermus NAD-malate dehydrogenase. PHOTOSYNTHESIS RESEARCH 2006; 89:213-23. [PMID: 17089214 DOI: 10.1007/s11120-006-9094-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Accepted: 08/14/2006] [Indexed: 05/12/2023]
Abstract
NADP-dependent chloroplastic malate dehydrogenase (E.C.1.1.1.82) is regulated by thiol disulfide-interchange with thioredoxin. It displays two regulatory disulfides per subunit, located in specific sequence extensions respectively at the N- and C-terminal ends of each subunit. In the present study, attempts were made to transfer the regulatory properties of sorghum NADP-malate dehydrogenase to a constitutively active NAD-dependent malate dehydogenase (E.C.1.1.1.37) from the thermophilic bacteria Thermus flavus, by grafting the regulatory extensions of the former to the latter. The results demonstrate that a successful transfer of redox regulation properties requires the grafting of both full-length extensions, but also the introduction of specific hydrophobic residues in the core part of the protein. These residues are very likely involved in the interaction between monomers, and structural changes at the active site.
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Simon A, Glöckner G, Felder M, Melkonian M, Becker B. EST analysis of the scaly green flagellate Mesostigma viride (Streptophyta): implications for the evolution of green plants (Viridiplantae). BMC PLANT BIOLOGY 2006; 6:2. [PMID: 16476162 PMCID: PMC1413533 DOI: 10.1186/1471-2229-6-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2005] [Accepted: 02/13/2006] [Indexed: 05/06/2023]
Abstract
BACKGROUND The Viridiplantae (land plants and green algae) consist of two monophyletic lineages, the Chlorophyta and the Streptophyta. The Streptophyta include all embryophytes and a small but diverse group of freshwater algae traditionally known as the Charophyceae (e.g. Charales, Coleochaete and the Zygnematales). The only flagellate currently included in the Streptophyta is Mesostigma viride Lauterborn. To gain insight into the genome evolution in streptophytes, we have sequenced 10,395 ESTs from Mesostigma representing 3,300 independent contigs and compared the ESTs of Mesostigma with available plant genomes (Arabidopsis, Oryza, Chlamydomonas), with ESTs from the bryophyte Physcomitrella, the genome of the rhodophyte Cyanidioschyzon, the ESTs from the rhodophyte Porphyra, and the genome of the diatom Thalassiosira. RESULTS The number of expressed genes shared by Mesostigma with the embryophytes (90.3 % of the expressed genes showing similarity to known proteins) is higher than with Chlamydomonas (76.1 %). In general, cytosolic metabolic pathways, and proteins involved in vesicular transport, transcription, regulation, DNA-structure and replication, cell cycle control, and RNA-metabolism are more conserved between Mesostigma and the embryophytes than between Mesostigma and Chlamydomonas. However, plastidic and mitochondrial metabolic pathways, cytoskeletal proteins and proteins involved in protein folding are more conserved between Mesostigma and Chlamydomonas than between Mesostigma and the embryophytes. CONCLUSION Our EST-analysis of Mesostigma supports the notion that this organism should be a suitable unicellular model for the last flagellate common ancestor of the streptophytes. Mesostigma shares more genes with the embryophytes than with the chlorophyte Chlamydomonas reinhardtii, although both organisms are flagellate unicells. Thus, it seems likely that several major physiological changes (e.g. in the regulation of photosynthesis and photorespiration) took place early during the evolution of streptophytes, i.e. before the transition to land.
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Affiliation(s)
- Andreas Simon
- Botanical Institute, University of Cologne, Gyrhofstr. 15, 50931 Cologne, Germany
| | - Gernot Glöckner
- Genome Analysis, Leibniz Institute for Age Research – Fritz Lipmann Institute, Beutenbergstr. 11, 07745 Jena, Germany
| | - Marius Felder
- Genome Analysis, Leibniz Institute for Age Research – Fritz Lipmann Institute, Beutenbergstr. 11, 07745 Jena, Germany
| | - Michael Melkonian
- Botanical Institute, University of Cologne, Gyrhofstr. 15, 50931 Cologne, Germany
| | - Burkhard Becker
- Botanical Institute, University of Cologne, Gyrhofstr. 15, 50931 Cologne, Germany
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Ball SG. Eukaryotic microalgae genomics. The essence of being a plant. PLANT PHYSIOLOGY 2005; 137:397-8. [PMID: 15710680 PMCID: PMC1065343 DOI: 10.1104/pp.104.900136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Affiliation(s)
- Steven G Ball
- Unité de Glycobiologie Structurale et Fonctionnelle, Unité Mixte de Recherche 8576 du Centre National de la Recherche Scientifique/Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq cedex, France
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