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Ishinishi R, Matsuura H, Tanaka S, Nozawa S, Tanada K, Kawashita N, Fujiyama K, Miyasaka H, Hirata K. Isolation and characterization of a stress-responsive gene encoding a CHRD domain-containing protein from a halotolerant green alga. Gene 2018; 640:14-20. [PMID: 29017964 DOI: 10.1016/j.gene.2017.10.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/12/2017] [Accepted: 10/06/2017] [Indexed: 11/18/2022]
Abstract
The genetic basis of stress resistance in extremophilic microalgae is not well studied. In this study, a gene of unknown function, the cluster58 or CL58 gene, was identified from the halotolerant green alga Chlamydomonas W80 and characterized. The CL58 gene encodes a protein containing a domain of unknown function, the CHRD domain, and a putative secretory signaling sequence at its N-terminus. The levels of CL58 mRNA increased in response to high copper levels and low temperatures. When the CL58 gene was heterologously expressed as a fusion gene with the NanoLuc luciferase gene in Chlamydomonas reinhardtii, a majority of the NanoLuc activity was detected in the culture medium compared with that in the intracellular fraction. A mutagenic analysis revealed that the putative secretory signaling sequence was sufficient for the secretion of the CL58-NanoLuc fusion protein. In addition, we expressed the protein encoded by the CL58 gene in Escherichia coli; the recombinant, soluble protein was then purified. In summary, we identified a novel gene from C. W80 that appears to encode a stress-responsive, CHRD domain-containing secreted protein.
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Affiliation(s)
- Ryo Ishinishi
- Applied Environmental Biology Laboratory, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hideyuki Matsuura
- Applied Environmental Biology Laboratory, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan.
| | - Satoshi Tanaka
- The Kansai Electric Power Co., Inc., Advanced Technology Laboratory, Keihanna Engineering Center, 1-7 Seika-cho, Souraku-gun, Kyoto 619-0237, Japan
| | - Saaya Nozawa
- Applied Environmental Biology Laboratory, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Keisuke Tanada
- Applied Environmental Biology Laboratory, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Norihito Kawashita
- Pharmainformatics and Pharmacometrics Laboratory, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kazuhito Fujiyama
- International Center for Biotechnology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hitoshi Miyasaka
- Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan
| | - Kazumasa Hirata
- Applied Environmental Biology Laboratory, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
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2
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Wang Y, Han H, Cui B, Hou Y, Wang Y, Wang Q. A glutathione peroxidase from Antarctic psychrotrophic bacterium Pseudoalteromonas sp. ANT506: Cloning and heterologous expression of the gene and characterization of recombinant enzyme. Bioengineered 2017; 8:742-749. [PMID: 28873004 DOI: 10.1080/21655979.2017.1373534] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
A glutathione peroxidase (GPx) gene, designated as PsGPx, was cloned from Antarctic psychrotrophic bacterium Pseudoalteromonas sp. ANT506 and expressed in Escherichia coli. The full-length PsGPx contained a 585-bp encoding 194 amino acids with predicted molecular masses of approx. 21.7 kDa. Multiple sequence alignments revealed that PsGPx belonged to the thioredoxin-like superfamily. PsGPx was heterologously overexpressed in E. coli, purified and characterized. The maximum catalytic temperature and pH value for recombinant PsGPx (rPsGPx) were 30°C and pH 9.0, respectively. rPsGPx retained 45% of the maximum activity at 0°C and exhibited high thermolability with a half-life of approx. 40 min at 40°C. In addition, the enzymatic activity of rPsGPx was still manifested under 3 M NaCl. The Km and Vmax values of the recombinant enzyme using GSH and H2O2 as substrates were 1.73 mM and 16.28 nmol/mL/min versus 2.46 mM and 21.50 nmol/mL/min, respectively.
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Affiliation(s)
- Yatong Wang
- a School of Marine and Technology , Harbin Institute of Technology , Weihai , Shandong , P.R. China
| | - Han Han
- a School of Marine and Technology , Harbin Institute of Technology , Weihai , Shandong , P.R. China
| | - Bingqing Cui
- a School of Marine and Technology , Harbin Institute of Technology , Weihai , Shandong , P.R. China
| | - Yanhua Hou
- a School of Marine and Technology , Harbin Institute of Technology , Weihai , Shandong , P.R. China
| | - Yifan Wang
- a School of Marine and Technology , Harbin Institute of Technology , Weihai , Shandong , P.R. China
| | - Quanfu Wang
- a School of Marine and Technology , Harbin Institute of Technology , Weihai , Shandong , P.R. China
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3
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Gomes MP, Le Manac'h SG, Moingt M, Smedbol E, Paquet S, Labrecque M, Lucotte M, Juneau P. Impact of phosphate on glyphosate uptake and toxicity in willow. JOURNAL OF HAZARDOUS MATERIALS 2016; 304:269-79. [PMID: 26561751 DOI: 10.1016/j.jhazmat.2015.10.043] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 09/15/2015] [Accepted: 10/20/2015] [Indexed: 05/17/2023]
Abstract
Phosphate (PO4(3-)) has been shown to increase glyphosate uptake by willow, a plant species known for its phytoremediation potential. However, it remains unclear if this stimulation of glyphosate uptake can result in an elevated glyphosate toxicity to plants (which could prevent the use of willows in glyphosate-remediation programs). Consequently, we studied the effects of PO4(3-) on glyphosate uptake and toxicity in a fast growing willow cultivar (Salix miyabeana SX64). Plants were grown in hydroponic solution with a combination of glyphosate (0, 0.001, 0.065 and 1 mg l(-1)) and PO4(3-) (0, 200 and 400 mg l(-1)). We demonstrated that PO4(3-) fertilization greatly increased glyphosate uptake by roots and its translocation to leaves, which resulted in increased shikimate concentration in leaves. In addition to its deleterious effects in photosynthesis, glyphosate induced oxidative stress through hydrogen peroxide accumulation. Although it has increased glyphosate accumulation, PO4(3-) fertilization attenuated the herbicide's deleterious effects by increasing the activity of antioxidant systems and alleviating glyphosate-induced oxidative stress. Our results indicate that in addition to the glyphosate uptake, PO4(3-) is involved in glyphosate toxicity in willow by preventing glyphosate induced oxidative stress.
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Affiliation(s)
- Marcelo Pedrosa Gomes
- Université du Québec à Montréal, Department of Biological Sciences, TOXEN, Ecotoxicology of Aquatic Microorganisms Laboratory, Succ. Centre-Ville, H3C 3P8 Montréal, Québec, Canada; Université du Québec à Montréal, Institut des Sciences de l'Environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada
| | - Sarah Gingras Le Manac'h
- Université du Québec à Montréal, Department of Biological Sciences, TOXEN, Ecotoxicology of Aquatic Microorganisms Laboratory, Succ. Centre-Ville, H3C 3P8 Montréal, Québec, Canada
| | - Matthieu Moingt
- Université du Québec à Montréal, Institut des Sciences de l'Environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada
| | - Elise Smedbol
- Université du Québec à Montréal, Institut des Sciences de l'Environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada
| | - Serge Paquet
- Université du Québec à Montréal, Institut des Sciences de l'Environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada
| | - Michel Labrecque
- Institut de Recherche en Biologie Végétale, Montreal Botanical Garden, 4101 Sherbrooke East, H1X 2B2, Montréal, Québec, Canada
| | - Marc Lucotte
- Université du Québec à Montréal, Institut des Sciences de l'Environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada
| | - Philippe Juneau
- Université du Québec à Montréal, Department of Biological Sciences, TOXEN, Ecotoxicology of Aquatic Microorganisms Laboratory, Succ. Centre-Ville, H3C 3P8 Montréal, Québec, Canada; Université du Québec à Montréal, Institut des Sciences de l'Environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada.
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4
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Passaia G, Margis-Pinheiro M. Glutathione peroxidases as redox sensor proteins in plant cells. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 234:22-6. [PMID: 25804806 DOI: 10.1016/j.plantsci.2015.01.017] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 01/27/2015] [Accepted: 01/29/2015] [Indexed: 05/24/2023]
Abstract
Glutathione peroxidases are thiol-based enzymes that catalyze the reduction of H2O2 and hydroperoxides to H2O or alcohols, they mitigate the toxicity of these compounds to the cell mainly using thioredoxin as an electron donor. Additionally, certain redox sensor and signaling functions are being ascribed to these enzymes in prokaryotes, fungi, and plants. We review the evolutionary history, enzymatic and biochemical evidence that make GPX proteins, in addition to being peroxiredoxins, important candidates for acting as redox sensor proteins in plants: (i) the lower peroxidase activity of Cys-GPX; (ii) the thiol catalytic center; (iii) the capacity to interact with regulatory proteins. All these characteristics suggest that at the basal level, plant GPXs have an important role in redox signal transduction in addition to their peroxidase activity.
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Affiliation(s)
- Gisele Passaia
- Department of Genetics, Federal University of Rio Grande do Sul, RS, Brazil
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Salt acclimation of cyanobacteria and their application in biotechnology. Life (Basel) 2014; 5:25-49. [PMID: 25551682 PMCID: PMC4390839 DOI: 10.3390/life5010025] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 12/19/2014] [Indexed: 12/25/2022] Open
Abstract
The long evolutionary history and photo-autotrophic lifestyle of cyanobacteria has allowed them to colonize almost all photic habitats on Earth, including environments with high or fluctuating salinity. Their basal salt acclimation strategy includes two principal reactions, the active export of ions and the accumulation of compatible solutes. Cyanobacterial salt acclimation has been characterized in much detail using selected model cyanobacteria, but their salt sensing and regulatory mechanisms are less well understood. Here, we briefly review recent advances in the identification of salt acclimation processes and the essential genes/proteins involved in acclimation to high salt. This knowledge is of increasing importance because the necessary mass cultivation of cyanobacteria for future use in biotechnology will be performed in sea water. In addition, cyanobacterial salt resistance genes also can be applied to improve the salt tolerance of salt sensitive organisms, such as crop plants.
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6
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Gomes MP, Soares AM, Garcia QS. Phosphorous and sulfur nutrition modulate antioxidant defenses in Myracrodruom urundeuva plants exposed to arsenic. JOURNAL OF HAZARDOUS MATERIALS 2014; 276:97-104. [PMID: 24866559 DOI: 10.1016/j.jhazmat.2014.05.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 04/10/2014] [Accepted: 05/08/2014] [Indexed: 05/17/2023]
Abstract
We investigated if plant nutrition and antioxidant system activation are correlated features of arsenic (As)-tolerance in Myracrodruom urundeuva. Plants were grown for 120 days in substrates with 0, 10, 50 and 100mg Askg(-1) and its As-tolerance was demonstrated. As-concentrations greater than 10mgkg(-1) decreased plant growth and photosynthesis but did not induce plant death. Plants coupled alterations in stomatal conductance and transpiration to avoid As-deleterious effects to the photosynthetic apparatus. As-toxicity in M. urundeuva was due to lipid peroxidation induced by hydrogen peroxide accumulation. Ascorbate peroxidase (APX) and gluthatione peroxidase (GPX) had central roles in hydrogen peroxide (H2O2) scavenging in leaves, and their activities were linked to changes in redox potentials (ascorbate and glutathione pools). APX and GPX inactivation/degeneration led to H2O2 accumulation and related lipid peroxidation. Increased phosphorus (P) and sulfur (S) concentrations in leaves were related to increased APX and GPX activities by stimulating increases in glutathione biosynthesis. We concluded that P and S nutrition were directly linked to As-tolerance in M. urundeuva plants by increasing antioxidant system activities.
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Affiliation(s)
- M P Gomes
- Université du Québec à Montréal, Institut des Sciences de l'environnement, Succ. Centre-Ville, C.P. 8888, H3C 3P8 Montréal, Québec, Canada.
| | - A M Soares
- Universidade Federal de Lavras, Departamento de Biologia, Campus UFLA, C.P. 3037, 37200-000 Lavras, MG, Brazil
| | - Q S Garcia
- Universidade Federal de Minas Gerais, Departamento de Botânica, C.P. 486, 31270-970 Belo Horizonte, MG, Brazil
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7
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Tanaka S, Ikeda K, Miyasaka H, Shioi Y, Suzuki Y, Tamoi M, Takeda T, Shigeoka S, Harada K, Hirata K. Comparison of three Chlamydomonas strains which show distinctive oxidative stress tolerance. J Biosci Bioeng 2011; 112:462-8. [PMID: 21839677 DOI: 10.1016/j.jbiosc.2011.07.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 07/15/2011] [Accepted: 07/20/2011] [Indexed: 11/17/2022]
Abstract
Methyl viologen (MV) causes severe oxidative stress by generating superoxide in the photosystem. The marine Chlamydomonas strain W80 is highly tolerant to MV (inhibitory concentration 50% [IC₅₀]=110 μM), and another marine Chlamydomonas strain HS5 shows also relatively a high tolerance (IC₅₀=12 μM). These two marine strains and a freshwater Chlamydomonas reinhardtii, which is highly sensitive to MV (IC₅₀=0.03 μM), were compared with respect to their reactive oxygen species (ROS) eliminating enzymes (superoxide dismutase, catalase, glutathione peroxidase, and ascorbate peroxidase), intracellular free amino acids, and antioxidant activities of the cell extracts. The marked difference between the marine Chlamydomonas strains and C. reinhardtii is the much higher (more than 5 fold) ascorbate peroxidase (APX) activity in the marine strains. The marine strains also kept the high APX activities (more than 100% of non-stressed condition) under the MV stressed condition, while the APX activity in C. reinhardtii was significantly decreased (36% of non-stressed condition) under the stressed condition, indicating that APX activity potentially contributes to the oxidative stress tolerance in Chlamydomonas. In addition, the levels of intracellular free proline, which is supposed to ameliorate oxidative stress, were several tens of times higher in the marine Chlamydomonas strains than in C. reinhardtii.
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Affiliation(s)
- Satoshi Tanaka
- The Kansai Electric Power Co., Environmental Research Center, Keihanna-Plaza, Hikaridai 1-7, Seikacho, Sourakugun, Kyoto 619-0237, Japan
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8
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Quantitative trait loci conferring resistance to Fusarium head blight in barley respond differentially to Fusarium graminearum infection. Funct Integr Genomics 2010; 11:95-102. [DOI: 10.1007/s10142-010-0192-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 08/28/2010] [Accepted: 09/06/2010] [Indexed: 10/19/2022]
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9
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Radakovits R, Jinkerson RE, Darzins A, Posewitz MC. Genetic engineering of algae for enhanced biofuel production. EUKARYOTIC CELL 2010; 9:486-501. [PMID: 20139239 PMCID: PMC2863401 DOI: 10.1128/ec.00364-09] [Citation(s) in RCA: 517] [Impact Index Per Article: 36.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
There are currently intensive global research efforts aimed at increasing and modifying the accumulation of lipids, alcohols, hydrocarbons, polysaccharides, and other energy storage compounds in photosynthetic organisms, yeast, and bacteria through genetic engineering. Many improvements have been realized, including increased lipid and carbohydrate production, improved H(2) yields, and the diversion of central metabolic intermediates into fungible biofuels. Photosynthetic microorganisms are attracting considerable interest within these efforts due to their relatively high photosynthetic conversion efficiencies, diverse metabolic capabilities, superior growth rates, and ability to store or secrete energy-rich hydrocarbons. Relative to cyanobacteria, eukaryotic microalgae possess several unique metabolic attributes of relevance to biofuel production, including the accumulation of significant quantities of triacylglycerol; the synthesis of storage starch (amylopectin and amylose), which is similar to that found in higher plants; and the ability to efficiently couple photosynthetic electron transport to H(2) production. Although the application of genetic engineering to improve energy production phenotypes in eukaryotic microalgae is in its infancy, significant advances in the development of genetic manipulation tools have recently been achieved with microalgal model systems and are being used to manipulate central carbon metabolism in these organisms. It is likely that many of these advances can be extended to industrially relevant organisms. This review is focused on potential avenues of genetic engineering that may be undertaken in order to improve microalgae as a biofuel platform for the production of biohydrogen, starch-derived alcohols, diesel fuel surrogates, and/or alkanes.
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Affiliation(s)
- Randor Radakovits
- Department of Chemistry and Geochemistry, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, and
| | - Robert E. Jinkerson
- Department of Chemistry and Geochemistry, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, and
| | - Al Darzins
- National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, Colorado 80401
| | - Matthew C. Posewitz
- Department of Chemistry and Geochemistry, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, and
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Suda Y, Yoshikawa T, Okuda Y, Tsunemoto M, Matsuda Y, Tanaka S, Ikeda K, Miyasaka H, Harada K, Bamba T, Hirata K. Comparative analysis of a CFo ATP synthase subunit II homologue derived from marine and fresh-water algae. J Biosci Bioeng 2009; 108:365-8. [PMID: 19804857 DOI: 10.1016/j.jbiosc.2009.05.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 05/21/2009] [Accepted: 05/23/2009] [Indexed: 11/19/2022]
Abstract
Comparative analysis was performed with a CFo ATP synthase subunit II homologue (CFo-II) derived from marine or fresh-water algae. The marine algae-derived CFo-II-transformed Escherichia coli grew and accumulated ATP more vigorously in NaCl or Cadmium containing medium, suggesting that this gene was useful for the development of stress-tolerant plant.
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Affiliation(s)
- Yoshito Suda
- Department of Environmental Biotechnology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan.
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11
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Suda Y, Yoshikawa T, Okuda Y, Tsunemoto M, Tanaka S, Ikeda K, Miyasaka H, Watanabe M, Sasaki K, Harada K, Bamba T, Hirata K. Isolation and characterization of a novel antistress gene from Chlamydomonas sp. W80. J Biosci Bioeng 2009; 107:352-4. [DOI: 10.1016/j.jbiosc.2008.12.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 12/18/2008] [Accepted: 12/19/2008] [Indexed: 10/21/2022]
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Abstract
Thiol/selenol peroxidases are ubiquitous nonheme peroxidases. They are divided into two major subfamilies: peroxiredoxins (PRXs) and glutathione peroxidases (GPXs). PRXs are present in diverse subcellular compartments and divided into four types: 2-cys PRX, 1-cys PRX, PRX-Q, and type II PRX (PRXII). In mammals, most GPXs are selenoenzymes containing a highly reactive selenocysteine in their active site while yeast and land plants are devoid of selenoproteins but contain nonselenium GPXs. The presence of a chloroplastic 2-cys PRX, a nonselenium GPX, and two selenium-dependent GPXs has been reported in the unicellular green alga Chlamydomonas reinhardtii. The availability of the Chlamydomonas genome sequence offers the opportunity to complete our knowledge on thiol/selenol peroxidases in this organism. In this article, Chlamydomonas PRX and GPX families are presented and compared to their counterparts in Arabidopsis, human, yeast, and Synechocystis sp. A summary of the current knowledge on each family of peroxidases, especially in photosynthetic organisms, phylogenetic analyses, and investigations of the putative subcellular localization of each protein and its relative expression level, on the basis of EST data, are presented. We show that Chlamydomonas PRX and GPX families share some similarities with other photosynthetic organisms but also with human cells. The data are discussed in view of recent results suggesting that these enzymes are important scavengers of reactive oxygen species (ROS) and reactive nitrogen species (RNS) but also play a role in ROS signaling.
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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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14
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Tanaka S, Suda Y, Ikeda K, Ono M, Miyasaka H, Watanabe M, Sasaki K, Hirata K. A novel gene with antisalt and anticadmium stress activities from a halotolerant marine green alga Chlamydomonas sp. W80. FEMS Microbiol Lett 2007; 271:48-52. [PMID: 17391362 DOI: 10.1111/j.1574-6968.2007.00696.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
A novel gene with antistress activities against both salt (NaCl) and cadmium stresses was isolated from the cDNA library of halotolerant green alga Chlamydomonas sp. strain W80 by a functional expression screening with Escherichia coli. The C-terminal region of this protein is responsible for the antistress activity, because N-terminal truncated clone of this gene retains the antistress activity, and the C-terminal truncated clone loses the activity. In the C-terminal region, there is a histidine and aspartic acid-rich domain (HD-rich domain).
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Affiliation(s)
- Satoshi Tanaka
- The Kansai Electric Power Co, Environmental Research Center, Kyoto, Japan
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15
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Abstract
Glutathione peroxidases (GPXs, EC 1.11.1.9) were first discovered in mammals as key enzymes involved in scavenging of activated oxygen species (AOS). Their efficient antioxidant activity depends on the presence of the rare amino-acid residue selenocysteine (SeCys) at the catalytic site. Nonselenium GPX-like proteins (NS-GPXs) with a Cys residue instead of SeCys have also been found in most organisms. As SeCys is important for GPX activity, the function of the NS-GPX can be questioned. Here, we highlight the evolutionary link between NS-GPX and seleno-GPX, particularly the evolution of the SeCys incorporation system. We then discuss what is known about the enzymatic activity and physiological functions of NS-GPX. Biochemical studies have shown that NS-GPXs are not true GPXs; notably they reduce AOS using reducing substrates other than glutathione, such as thioredoxin. We provide evidence that, in addition to their inefficient scavenging action, NS-GPXs act as AOS sensors in various signal-transduction pathways.
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16
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Herbette S, Menn AL, Rousselle P, Ameglio T, Faltin Z, Branlard G, Eshdat Y, Julien JL, Drevet JR, Roeckel-Drevet P. Modification of photosynthetic regulation in tomato overexpressing glutathione peroxidase. Biochim Biophys Acta Gen Subj 2005; 1724:108-18. [PMID: 15921856 DOI: 10.1016/j.bbagen.2005.04.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2004] [Revised: 04/21/2005] [Accepted: 04/21/2005] [Indexed: 11/22/2022]
Abstract
To investigate the function of glutathione peroxidase (GPX) in plants, we produced transgenic tomato plants overexpressing an eukaryotic selenium-independent GPX (GPX5). We show here that total GPX activity was increased by 50% in transgenic plants, when compared to control plants transformed with the binary vector without the insert (PZP111). A preliminary two-dimensional electrophoretic protein analysis of the GPX overexpressing plants showed notably a decrease in the accumulation of proteins identified as rubisco small subunit 1 and fructose-1,6-bisphosphate aldolase, two proteins involved in photosynthesis. These observations, together with the fact that in standard culture conditions, GPX-overexpressing plants were not phenotypically distinct from control plants prompted us to challenge the plants with a chilling treatment that is known to affect photosynthesis activity. We found that upon chilling treatment with low light level, photosynthesis was not affected in GPX-overexpressing plants while it was in control plants, as revealed by chlorophyll fluorescence parameters and fructose-1,6-biphosphatase activity. These results suggest that overexpression of a selenium-independent GPX in tomato plants modifies specifically gene expression and leads to modifications of photosynthetic regulation processes.
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Tanaka S, Ikeda K, Miyasaka H. Isolation of a new member of group 3 late embryogenesis abundant protein gene from a halotorelant green alga by a functional expression screening with cyanobacterial cells. FEMS Microbiol Lett 2004. [DOI: 10.1111/j.1574-6968.2004.tb09624.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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18
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Yoshimura K, Miyao K, Gaber A, Takeda T, Kanaboshi H, Miyasaka H, Shigeoka S. Enhancement of stress tolerance in transgenic tobacco plants overexpressing Chlamydomonas glutathione peroxidase in chloroplasts or cytosol. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2004; 37:21-33. [PMID: 14675429 DOI: 10.1046/j.1365-313x.2003.01930.x] [Citation(s) in RCA: 133] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
To evaluate the physiological potential of the defense system against hydroperoxidation of membrane-lipid components caused by environmental stresses in higher plants, we generated transgenic tobacco plants expressing a glutathione peroxidase (GPX)-like protein in the cytosol (TcGPX) or chloroplasts (TpGPX). The activities toward alpha-linolenic acid hydroperoxide in TcGPX and TpGPX plants were 47.5-75.3 and 32.7-42.1 nM min(-1) mg(-1) protein, respectively, while no activity was detected in wild-type plants. The transgenic plants showed increased tolerance to oxidative stress caused by application of methylviologen (MV: 50 microM) under moderate light intensity (200 micro E m(-2) sec(-1)), chilling stress under high light intensity (4 degrees C, 1000 microE m(-2) sec(-1)), or salt stress (250 mM NaCl). Under these stresses, the lipid hydroperoxidation (the production of malondialdehyde (MDA)) of the leaves of TcGPX and TpGPX plants was clearly suppressed compared with that of wild-type plants. Furthermore, the capacity of the photosynthetic and antioxidative systems in the transgenic plants remained higher than those of wild-type plants under chilling or salt stress. These results clearly indicate that a high level of GPX-like protein in tobacco plants functions to remove unsaturated fatty acid hydroperoxides generated in cellular membranes under stress conditions, leading to the maintenance of membrane integrity and increased tolerance to oxidative stress caused by various stress conditions.
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MESH Headings
- Adaptation, Physiological/drug effects
- Adaptation, Physiological/genetics
- Adaptation, Physiological/physiology
- Adaptation, Physiological/radiation effects
- Algal Proteins/genetics
- Algal Proteins/metabolism
- Animals
- Cell Membrane/drug effects
- Chlamydomonas/enzymology
- Chloroplasts/enzymology
- Cold Temperature
- Cytoplasm/enzymology
- Cytosol/enzymology
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Plant
- Glutathione Peroxidase/genetics
- Glutathione Peroxidase/metabolism
- Light
- Lipid Peroxidation/drug effects
- Lipid Peroxidation/physiology
- Lipid Peroxidation/radiation effects
- Oxidative Stress/drug effects
- Oxidative Stress/physiology
- Oxidative Stress/radiation effects
- Paraquat/pharmacology
- Plants, Genetically Modified/drug effects
- Plants, Genetically Modified/genetics
- Plants, Genetically Modified/metabolism
- Plants, Genetically Modified/radiation effects
- Reactive Oxygen Species
- Sodium Chloride/pharmacology
- Nicotiana/genetics
- Nicotiana/metabolism
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Affiliation(s)
- Kazuya Yoshimura
- Advanced Life Science, Graduate School, Kinki University, 3327-204 Nakamachi, Nara 631-8505, Japan
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