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Kaszecki E, Palberg D, Grant M, Griffin S, Dhanjal C, Capperauld M, Emery RJN, Saville BJ. Euglena mutabilis exists in a FAB consortium with microbes that enhance cadmium tolerance. Int Microbiol 2024; 27:1249-1268. [PMID: 38167969 PMCID: PMC11300505 DOI: 10.1007/s10123-023-00474-7] [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: 10/19/2023] [Revised: 11/29/2023] [Accepted: 12/15/2023] [Indexed: 01/05/2024]
Abstract
BACKGROUND Synthetic algal-fungal and algal-bacterial cultures have been investigated as a means to enhance the technological applications of the algae. This inclusion of other microbes has enhanced growth and improved stress tolerance of the algal culture. The goal of the current study was to investigate natural microbial consortia to gain an understanding of the occurrence and benefits of these associations in nature. The photosynthetic protist Euglena mutabilis is often found in association with other microbes in acidic environments with high heavy metal (HM) concentrations. This may suggest that microbial interactions are essential for the protist's ability to tolerate these extreme environments. Our study assessed the Cd tolerance of a natural fungal-algal-bacterial (FAB) association whereby the algae is E. mutabilis. RESULTS This study provides the first assessment of antibiotic and antimycotic agents on an E. mutabilis culture. The results indicate that antibiotic and antimycotic applications significantly decreased the viability of E. mutabilis cells when they were also exposed to Cd. Similar antibiotic treatments of E. gracilis cultures had variable or non-significant impacts on Cd tolerance. E. gracilis also recovered better after pre-treatment with antibiotics and Cd than did E. mutabilis. The recoveries were assessed by heterotrophic growth without antibiotics or Cd. In contrast, both Euglena species displayed increased chlorophyll production upon Cd exposure. PacBio full-length amplicon sequencing and targeted Sanger sequencing identified the microbial species present in the E. mutabilis culture to be the fungus Talaromyces sp. and the bacterium Acidiphilium acidophilum. CONCLUSION This study uncovers a possible fungal, algal, and bacterial relationship, what we refer to as a FAB consortium. The members of this consortium interact to enhance the response to Cd exposure. This results in a E. mutabilis culture that has a higher tolerance to Cd than the axenic E. gracilis. The description of this interaction provides a basis for explore the benefits of natural interactions. This will provide knowledge and direction for use when creating or maintaining FAB interactions for biotechnological purposes, including bioremediation.
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Affiliation(s)
- Emma Kaszecki
- Environmental and Life Science Graduate Program, Trent University, Peterborough, ON, Canada
| | - Daniel Palberg
- Environmental and Life Science Graduate Program, Trent University, Peterborough, ON, Canada
| | - Mikaella Grant
- Environmental and Life Science Graduate Program, Trent University, Peterborough, ON, Canada
| | - Sarah Griffin
- Forensic Science Department, Trent University, Peterborough, ON, Canada
| | - Chetan Dhanjal
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | | | - R J Neil Emery
- Environmental and Life Science Graduate Program, Trent University, Peterborough, ON, Canada
- Department of Biology, Trent University, Peterborough, ON, Canada
| | - Barry J Saville
- Environmental and Life Science Graduate Program, Trent University, Peterborough, ON, Canada.
- Forensic Science Department, Trent University, Peterborough, ON, Canada.
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He J, Liu C, Du M, Zhou X, Hu Z, Lei A, Wang J. Metabolic Responses of a Model Green Microalga Euglena gracilis to Different Environmental Stresses. Front Bioeng Biotechnol 2021; 9:662655. [PMID: 34354984 PMCID: PMC8329484 DOI: 10.3389/fbioe.2021.662655] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 06/10/2021] [Indexed: 12/11/2022] Open
Abstract
Euglena gracilis, a green microalga known as a potential candidate for jet fuel producers and new functional food resources, is highly tolerant to antibiotics, heavy metals, and other environmental stresses. Its cells contain many high-value products, including vitamins, amino acids, pigments, unsaturated fatty acids, and carbohydrate paramylon as metabolites, which change contents in response to various extracellular environments. However, mechanism insights into the cellular metabolic response of Euglena to different toxic chemicals and adverse environmental stresses were very limited. We extensively investigated the changes of cell biomass, pigments, lipids, and paramylon of E. gracilis under several environmental stresses, such as heavy metal CdCl2, antibiotics paromomycin, and nutrient deprivation. In addition, global metabolomics by Ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) was applied to study other metabolites and potential regulatory mechanisms behind the differential accumulation of major high-valued metabolites. This study collects a comprehensive update on the biology of E. gracilis for various metabolic responses to stress conditions, and it will be of great value for Euglena cultivation and high-value [154mm][10mm]Q7metabolite production.
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Affiliation(s)
- Jiayi He
- Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China.,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China
| | - ChenChen Liu
- Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Mengzhe Du
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China
| | - Xiyi Zhou
- Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Zhangli Hu
- Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China.,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China
| | - Anping Lei
- Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Jiangxin Wang
- Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
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3
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Contrasting arsenic biogeochemical cycling in two Moroccan alkaline pit lakes. Res Microbiol 2020; 171:28-36. [DOI: 10.1016/j.resmic.2019.10.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 10/23/2019] [Accepted: 10/23/2019] [Indexed: 11/24/2022]
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4
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Abinandan S, Subashchandrabose SR, Venkateswarlu K, Megharaj M. Microalgae-bacteria biofilms: a sustainable synergistic approach in remediation of acid mine drainage. Appl Microbiol Biotechnol 2018; 102:1131-1144. [PMID: 29260261 DOI: 10.1007/s00253-017-8693-] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/03/2017] [Accepted: 12/04/2017] [Indexed: 05/28/2023]
Abstract
Microalgae and bacteria offer a huge potential in delving interest to study and explore various mechanisms under extreme environments. Acid mine drainage (AMD) is one such environment which is extremely acidic containing copious amounts of heavy metals and poses a major threat to the ecosystem. Despite its extreme conditions, AMD is the habitat for several microbes and their activities. The use of various chemicals in prevention of AMD formation and conventional treatment in a larger scale is not feasible under different geological conditions. It implies that microbe-mediated approach is a viable and sustainable alternative technology for AMD remediation. Microalgae in biofilms play a pivotal role in such bioremediation as they maintain mutualism with heterotrophic bacteria. Synergistic approach of using microalgae-bacteria biofilms provides supportive metabolites from algal biomass for growth of bacteria and mediates remediation of AMD. However, by virtue of their physiology and capabilities of metal removal, non-acidophilic microalgae can be acclimated for use in AMD remediation. A combination of selective acidophilic and non-acidophilic microalgae together with bacteria, all in the form of biofilms, may be very effective for bioremediation of metal-contaminated waters. The present review critically examines the nature of mutualistic interactions established between microalgae and bacteria in biofilms and their role in removal of metals from AMDs, and consequent biomass production for the yield of biofuel. Integration of microalgal-bacterial consortia in fuel cells would be an attractive emerging approach of microbial biotechnology for AMD remediation.
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Affiliation(s)
- Sudharsanam Abinandan
- Global Centre for Environmental Remediation (GCER), Faculty of Science, University of Newcastle, ATC Building, University Drive, Callaghan, NSW, 2308, Australia
| | - Suresh R Subashchandrabose
- Global Centre for Environmental Remediation (GCER), Faculty of Science, University of Newcastle, ATC Building, University Drive, Callaghan, NSW, 2308, Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of Environment (CRC CARE), University of Newcastle, ATC Building, University Drive, Callaghan, NSW, 2308, Australia
| | - Kadiyala Venkateswarlu
- Formerly Department of Microbiology, Sri Krishnadevaraya University, Anantapur, 515055, India
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation (GCER), Faculty of Science, University of Newcastle, ATC Building, University Drive, Callaghan, NSW, 2308, Australia.
- Cooperative Research Centre for Contamination Assessment and Remediation of Environment (CRC CARE), University of Newcastle, ATC Building, University Drive, Callaghan, NSW, 2308, Australia.
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5
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Microalgae-bacteria biofilms: a sustainable synergistic approach in remediation of acid mine drainage. Appl Microbiol Biotechnol 2017; 102:1131-1144. [PMID: 29260261 DOI: 10.1007/s00253-017-8693-7] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/03/2017] [Accepted: 12/04/2017] [Indexed: 10/18/2022]
Abstract
Microalgae and bacteria offer a huge potential in delving interest to study and explore various mechanisms under extreme environments. Acid mine drainage (AMD) is one such environment which is extremely acidic containing copious amounts of heavy metals and poses a major threat to the ecosystem. Despite its extreme conditions, AMD is the habitat for several microbes and their activities. The use of various chemicals in prevention of AMD formation and conventional treatment in a larger scale is not feasible under different geological conditions. It implies that microbe-mediated approach is a viable and sustainable alternative technology for AMD remediation. Microalgae in biofilms play a pivotal role in such bioremediation as they maintain mutualism with heterotrophic bacteria. Synergistic approach of using microalgae-bacteria biofilms provides supportive metabolites from algal biomass for growth of bacteria and mediates remediation of AMD. However, by virtue of their physiology and capabilities of metal removal, non-acidophilic microalgae can be acclimated for use in AMD remediation. A combination of selective acidophilic and non-acidophilic microalgae together with bacteria, all in the form of biofilms, may be very effective for bioremediation of metal-contaminated waters. The present review critically examines the nature of mutualistic interactions established between microalgae and bacteria in biofilms and their role in removal of metals from AMDs, and consequent biomass production for the yield of biofuel. Integration of microalgal-bacterial consortia in fuel cells would be an attractive emerging approach of microbial biotechnology for AMD remediation.
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6
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Prigent S, Frioux C, Dittami SM, Thiele S, Larhlimi A, Collet G, Gutknecht F, Got J, Eveillard D, Bourdon J, Plewniak F, Tonon T, Siegel A. Meneco, a Topology-Based Gap-Filling Tool Applicable to Degraded Genome-Wide Metabolic Networks. PLoS Comput Biol 2017; 13:e1005276. [PMID: 28129330 PMCID: PMC5302834 DOI: 10.1371/journal.pcbi.1005276] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 02/10/2017] [Accepted: 11/30/2016] [Indexed: 11/18/2022] Open
Abstract
Increasing amounts of sequence data are becoming available for a wide range of non-model organisms. Investigating and modelling the metabolic behaviour of those organisms is highly relevant to understand their biology and ecology. As sequences are often incomplete and poorly annotated, draft networks of their metabolism largely suffer from incompleteness. Appropriate gap-filling methods to identify and add missing reactions are therefore required to address this issue. However, current tools rely on phenotypic or taxonomic information, or are very sensitive to the stoichiometric balance of metabolic reactions, especially concerning the co-factors. This type of information is often not available or at least prone to errors for newly-explored organisms. Here we introduce Meneco, a tool dedicated to the topological gap-filling of genome-scale draft metabolic networks. Meneco reformulates gap-filling as a qualitative combinatorial optimization problem, omitting constraints raised by the stoichiometry of a metabolic network considered in other methods, and solves this problem using Answer Set Programming. Run on several artificial test sets gathering 10,800 degraded Escherichia coli networks Meneco was able to efficiently identify essential reactions missing in networks at high degradation rates, outperforming the stoichiometry-based tools in scalability. To demonstrate the utility of Meneco we applied it to two case studies. Its application to recent metabolic networks reconstructed for the brown algal model Ectocarpus siliculosus and an associated bacterium Candidatus Phaeomarinobacter ectocarpi revealed several candidate metabolic pathways for algal-bacterial interactions. Then Meneco was used to reconstruct, from transcriptomic and metabolomic data, the first metabolic network for the microalga Euglena mutabilis. These two case studies show that Meneco is a versatile tool to complete draft genome-scale metabolic networks produced from heterogeneous data, and to suggest relevant reactions that explain the metabolic capacity of a biological system.
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Affiliation(s)
- Sylvain Prigent
- Institute for Research in IT and Random Systems - IRISA, Université de Rennes 1, Rennes, France
- Department of Biology and Biological Engineering, Chalmers University of Technology, Göteborg, Sweden
- Irisa, CNRS, Rennes, France
- Dyliss, Inria, Rennes, France
- * E-mail: (AS); (SP)
| | - Clémence Frioux
- Institute for Research in IT and Random Systems - IRISA, Université de Rennes 1, Rennes, France
- Irisa, CNRS, Rennes, France
- Dyliss, Inria, Rennes, France
| | - Simon M. Dittami
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Roscoff, France
| | | | - Abdelhalim Larhlimi
- Computer Science Laboratory of Nantes Atlantique - LINA UMR6241, Université de Nantes, Nantes, France
| | - Guillaume Collet
- Institute for Research in IT and Random Systems - IRISA, Université de Rennes 1, Rennes, France
- Irisa, CNRS, Rennes, France
- Dyliss, Inria, Rennes, France
| | - Fabien Gutknecht
- Molecular Genetics, Genomics and Microbiology - GMGM, Université de Strasbourg, Strasbourg, France
| | - Jeanne Got
- Institute for Research in IT and Random Systems - IRISA, Université de Rennes 1, Rennes, France
- Irisa, CNRS, Rennes, France
- Dyliss, Inria, Rennes, France
| | - Damien Eveillard
- Computer Science Laboratory of Nantes Atlantique - LINA UMR6241, Université de Nantes, Nantes, France
| | - Jérémie Bourdon
- Computer Science Laboratory of Nantes Atlantique - LINA UMR6241, Université de Nantes, Nantes, France
| | - Frédéric Plewniak
- Molecular Genetics, Genomics and Microbiology - GMGM, Université de Strasbourg, Strasbourg, France
- GMGM, CNRS, Strasbourg, France
| | - Thierry Tonon
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Roscoff, France
| | - Anne Siegel
- Institute for Research in IT and Random Systems - IRISA, Université de Rennes 1, Rennes, France
- Irisa, CNRS, Rennes, France
- Dyliss, Inria, Rennes, France
- * E-mail: (AS); (SP)
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7
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Biochemistry and Physiology of Heavy Metal Resistance and Accumulation in Euglena. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 979:91-121. [PMID: 28429319 DOI: 10.1007/978-3-319-54910-1_6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Free-living microorganisms may become suitable models for removal of heavy metals from polluted water bodies, sediments, and soils by using and enhancing their metal accumulating abilities. The available research data indicate that protists of the genus Euglena are a highly promising group of microorganisms to be used in bio-remediation of heavy metal-polluted aerobic and anaerobic acidic aquatic environments. This chapter analyzes the variety of biochemical mechanisms evolved in E. gracilis to resist, accumulate and remove heavy metals from the environment, being the most relevant those involving (1) adsorption to the external cell pellicle; (2) intracellular binding by glutathione and glutathione polymers, and their further compartmentalization as heavy metal-complexes into chloroplasts and mitochondria; (3) polyphosphate biosynthesis; and (4) secretion of organic acids. The available data at the transcriptional, kinetic and metabolic levels on these metabolic/cellular processes are herein reviewed and analyzed to provide mechanistic basis for developing genetically engineered Euglena cells that may have a greater removal and accumulating capacity for bioremediation and recycling of heavy metals.
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Capello M, Cutroneo L, Consani S, Dinelli E, Vagge G, Carbone C. Marine sediment contamination and dynamics at the mouth of a contaminated torrent: The case of the Gromolo Torrent (Sestri Levante, north-western Italy). MARINE POLLUTION BULLETIN 2016; 109:128-141. [PMID: 27289290 DOI: 10.1016/j.marpolbul.2016.06.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 05/30/2016] [Accepted: 06/02/2016] [Indexed: 06/06/2023]
Abstract
In this study we have examined the currents and hydrological characteristics of the water column off the mouth of the Gromolo Torrent (north-western Italy) in relation to the grain-size, mineralogical characteristics and metal distribution in the marine sediment sampled. Our purpose was to quantify and map the contamination that was carried out to sea from the abandoned Libiola Fe-Cu sulphide mine that has heavily impacted the torrent. Our results show high concentrations of Cu and Zn, and relatively high concentrations of Cd and Ni inside the bay into which the Gromolo Torrent flows. However, high concentrations of As, Cr, Hg, Mn, Pb, and V found in the northern and/or eastern parts of the study area originated from other sources. The subdivision of study stations in terms of metal and mineral contents in the bottom sediments highlighted the clear influence of the currents on their dispersion and distribution in the area.
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Affiliation(s)
- M Capello
- DISTAV, University of Genoa, 26 Corso Europa, Genoa I-16132, Italy.
| | - L Cutroneo
- DISTAV, University of Genoa, 26 Corso Europa, Genoa I-16132, Italy
| | - S Consani
- DISTAV, University of Genoa, 26 Corso Europa, Genoa I-16132, Italy
| | - E Dinelli
- BiGeA, University of Bologna, 1 Piazza di Porta San Donato, Bologna I-40126, Italy
| | - G Vagge
- DISTAV, University of Genoa, 26 Corso Europa, Genoa I-16132, Italy
| | - C Carbone
- DISTAV, University of Genoa, 26 Corso Europa, Genoa I-16132, Italy
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Yamada K, Suzuki H, Takeuchi T, Kazama Y, Mitra S, Abe T, Goda K, Suzuki K, Iwata O. Efficient selective breeding of live oil-rich Euglena gracilis with fluorescence-activated cell sorting. Sci Rep 2016; 6:26327. [PMID: 27212384 PMCID: PMC4876468 DOI: 10.1038/srep26327] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/03/2016] [Indexed: 11/08/2022] Open
Abstract
Euglena gracilis, a microalgal species of unicellular flagellate protists, has attracted much attention in both the industrial and academic sectors due to recent advances in the mass cultivation of E. gracilis that have enabled the cost-effective production of nutritional food and cosmetic commodities. In addition, it is known to produce paramylon (β-1,3-glucan in a crystalline form) as reserve polysaccharide and convert it to wax ester in hypoxic and anaerobic conditions-a promising feedstock for biodiesel and aviation biofuel. However, there remain a number of technical challenges to be solved before it can be deployed in the competitive fuel market. Here we present a method for efficient selective breeding of live oil-rich E. gracilis with fluorescence-activated cell sorting (FACS). Specifically, the selective breeding method is a repetitive procedure for one-week heterotrophic cultivation, staining intracellular lipids with BODIPY(505/515), and FACS-based isolation of top 0.5% lipid-rich E. gracilis cells with high viability, after inducing mutation with Fe-ion irradiation to the wild type (WT). Consequently, we acquire a live, stable, lipid-rich E. gracilis mutant strain, named B1ZFeL, with 40% more lipid content on average than the WT. Our method paves the way for rapid, cost-effective, energy-efficient production of biofuel.
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Affiliation(s)
| | | | | | - Yusuke Kazama
- Nishina Center for Accelerator-Based Science, RIKEN, Saitama 351-0198, Japan
| | | | - Tomoko Abe
- Nishina Center for Accelerator-Based Science, RIKEN, Saitama 351-0198, Japan
| | - Keisuke Goda
- Department of Chemistry, University of Tokyo, Tokyo 113-0033, Japan
- Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA
- Japan Science and Technology Agency, Tokyo 102-0075, Japan
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Koechler S, Bertin PN, Plewniak F, Baltenweck R, Casiot C, Heipieper HJ, Bouchez O, Arsène-Ploetze F, Hugueney P, Halter D. Arsenite response in Coccomyxa sp. Carn explored by transcriptomic and non-targeted metabolomic approaches. Environ Microbiol 2016; 18:1289-300. [PMID: 26769162 DOI: 10.1111/1462-2920.13227] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 12/20/2015] [Accepted: 01/12/2016] [Indexed: 12/17/2022]
Abstract
Arsenic is a toxic metalloid known to generate an important oxidative stress in cells. In the present study, we focused our attention on an alga related to the genus Coccomyxa, exhibiting an extraordinary capacity to resist high concentrations of arsenite and arsenate. The integrated analysis of high-throughput transcriptomic data and non-targeted metabolomic approaches highlighted multiple levels of protection against arsenite. Indeed, Coccomyxa sp. Carn induced a set of transporters potentially preventing the accumulation of this metalloid in the cells and presented a distinct arsenic metabolism in comparison to another species more sensitive to that compound, i.e. Euglena gracilis, especially in regard to arsenic methylation. Interestingly, Coccomyxa sp. Carn was characterized by a remarkable accumulation of the strong antioxidant glutathione (GSH). Such observation could explain the apparent low oxidative stress in the intracellular compartment, as suggested by the transcriptomic analysis. In particular, the high amount of GSH in the cell could play an important role for the tolerance to arsenate, as suggested by its partial oxidation into oxidized glutathione in presence of this metalloid. Our results therefore reveal that this alga has acquired multiple and original defence mechanisms allowing the colonization of extreme ecosystems such as acid mine drainages.
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Affiliation(s)
- Sandrine Koechler
- Génétique Moléculaire, Génomique et Microbiologie, Département Microorganismes, Génomes, Environnement UMR7156 Université de Strasbourg/CNRS, 28 rue Goethe, 67083, Strasbourg Cedex, France
| | - Philippe N Bertin
- Génétique Moléculaire, Génomique et Microbiologie, Département Microorganismes, Génomes, Environnement UMR7156 Université de Strasbourg/CNRS, 28 rue Goethe, 67083, Strasbourg Cedex, France
| | - Frédéric Plewniak
- Génétique Moléculaire, Génomique et Microbiologie, Département Microorganismes, Génomes, Environnement UMR7156 Université de Strasbourg/CNRS, 28 rue Goethe, 67083, Strasbourg Cedex, France
| | - Raymonde Baltenweck
- Unité Mixte de Recherche Santé de la Vigne et Qualité du Vin, Equipe Métabolisme secondaire de la vigne INRA, 68021, Colmar, France
| | - Corinne Casiot
- Hydrosciences Montpellier, UMR 5569 (CNRS, IRD, UM1, UM2), Université Montpellier 2, Place E. Bataillon, 34095, Montpellier Cedex 05, France
| | - Hermann J Heipieper
- Helmholtz Centre for Environmental Research - UFZ, Department Environmental Biotechnology, Permoserstr. 15, Leipzig, Germany
| | - Olivier Bouchez
- GeT-PlaGe (Plateforme Génomique) Campus INRA, 24 Chemin de Borde Rouge - Auzeville CS 52627, 31326, Castanet-Tolosan, France
| | - Florence Arsène-Ploetze
- Génétique Moléculaire, Génomique et Microbiologie, Département Microorganismes, Génomes, Environnement UMR7156 Université de Strasbourg/CNRS, 28 rue Goethe, 67083, Strasbourg Cedex, France
| | - Philippe Hugueney
- Unité Mixte de Recherche Santé de la Vigne et Qualité du Vin, Equipe Métabolisme secondaire de la vigne INRA, 68021, Colmar, France
| | - David Halter
- Unité Mixte de Recherche Santé de la Vigne et Qualité du Vin, Equipe Métabolisme secondaire de la vigne INRA, 68021, Colmar, France
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Hovasse A, Bruneel O, Casiot C, Desoeuvre A, Farasin J, Hery M, Van Dorsselaer A, Carapito C, Arsène-Ploetze F. Spatio-Temporal Detection of the Thiomonas Population and the Thiomonas Arsenite Oxidase Involved in Natural Arsenite Attenuation Processes in the Carnoulès Acid Mine Drainage. Front Cell Dev Biol 2016; 4:3. [PMID: 26870729 PMCID: PMC4734075 DOI: 10.3389/fcell.2016.00003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 01/11/2016] [Indexed: 11/19/2022] Open
Abstract
The acid mine drainage (AMD) impacted creek of the Carnoulès mine (Southern France) is characterized by acid waters with a high heavy metal content. The microbial community inhabiting this AMD was extensively studied using isolation, metagenomic and metaproteomic methods, and the results showed that a natural arsenic (and iron) attenuation process involving the arsenite oxidase activity of several Thiomonas strains occurs at this site. A sensitive quantitative Selected Reaction Monitoring (SRM)-based proteomic approach was developed for detecting and quantifying the two subunits of the arsenite oxidase and RpoA of two different Thiomonas groups. Using this approach combined with FISH and pyrosequencing-based 16S rRNA gene sequence analysis, it was established here for the first time that these Thiomonas strains are ubiquitously present in minor proportions in this AMD and that they express the key enzymes involved in natural remediation processes at various locations and time points. In addition to these findings, this study also confirms that targeted proteomics applied at the community level can be used to detect weakly abundant proteins in situ.
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Affiliation(s)
- Agnès Hovasse
- Laboratoire de Spectrométrie de Masse BioOrganique, Institut Pluridisciplinaire Hubert Curien, UMR7178, Centre National de la Recherche Scientifique, Université de Strasbourg Strasbourg, France
| | - Odile Bruneel
- Laboratoire HydroSciences Montpellier, UMR HSM 5569, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Université Montpellier Montpellier, France
| | - Corinne Casiot
- Laboratoire HydroSciences Montpellier, UMR HSM 5569, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Université Montpellier Montpellier, France
| | - Angélique Desoeuvre
- Laboratoire HydroSciences Montpellier, UMR HSM 5569, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Université Montpellier Montpellier, France
| | - Julien Farasin
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Centre National de la Recherche Scientifique-Université de Strasbourg, Département Microorganismes, Génomes, Environnement, Equipe Ecophysiologie Moléculaire des Microorganismes Strasbourg, France
| | - Marina Hery
- Laboratoire HydroSciences Montpellier, UMR HSM 5569, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, Université Montpellier Montpellier, France
| | - Alain Van Dorsselaer
- Laboratoire de Spectrométrie de Masse BioOrganique, Institut Pluridisciplinaire Hubert Curien, UMR7178, Centre National de la Recherche Scientifique, Université de Strasbourg Strasbourg, France
| | - Christine Carapito
- Laboratoire de Spectrométrie de Masse BioOrganique, Institut Pluridisciplinaire Hubert Curien, UMR7178, Centre National de la Recherche Scientifique, Université de Strasbourg Strasbourg, France
| | - Florence Arsène-Ploetze
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Centre National de la Recherche Scientifique-Université de Strasbourg, Département Microorganismes, Génomes, Environnement, Equipe Ecophysiologie Moléculaire des Microorganismes Strasbourg, France
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12
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Franco MW, Ferreira FAG, Vasconcelos IF, Batista BL, Pujoni DGF, Magalhães SMS, Barbosa F, Barbosa FAR. Arsenic biotransformation by cyanobacteria from mining areas: evidences from culture experiments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:18607-18615. [PMID: 26408110 DOI: 10.1007/s11356-015-5425-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 09/14/2015] [Indexed: 06/05/2023]
Abstract
Elucidating the role of cyanobacteria in the biotransformation of arsenic (As) oxyanions is crucial to understand the biogeochemical cycle of this element and indicate species with potential for its bioremediation. In this study, we determined the EC50 for As(III) and As(V) and evaluated the biotransformation of As by Synechococcus sp. through high-performance liquid chromatography hyphenated to inductively coupled plasma mass spectrometry (HPLC-ICP-MS) and X-ray absorption fine structure spectroscopy (XAFS). Synechococcus sp. exhibited higher sensitivity to As(III) with an EC(50, 96 h) of 6.64 mg L(-1) that was approximately 400-fold lower than that for As(V). Even though the cells were exposed to concentrations of As(III) (6 mg L(-1)) approximately 67-fold lower than those of As(V) (400 mg L(-1)), similar intracellular concentrations of As (60.0 μg g(-1)) were observed after 30 days. As(V) was the predominant intracellular As species followed by As(III). Furthermore, organic As species such as monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) were observed in higher proportions after exposure to As(III). The differential toxicity among As oxyanions indicates that determining the redox state of As in the environment is fundamental to estimate toxicity risks to aquatic organisms. Synechococcus sp. demonstrated potential for its application in bioremediation due to the high accumulation of As and production of As organic compounds notably after exposure to As(III).
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Affiliation(s)
- Maione W Franco
- Laboratório de Limnologia, Ecotoxicologia e Ecologia Aquática, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais-UFMG, Belo Horizonte, MG, Brazil.
| | - Fernanda A G Ferreira
- Laboratório de Limnologia, Ecotoxicologia e Ecologia Aquática, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais-UFMG, Belo Horizonte, MG, Brazil
| | - Igor F Vasconcelos
- Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Ceará, Fortaleza, 60020-181, CE, Brazil
| | - Bruno L Batista
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, 09210-580, SP, Brazil
| | - Diego G F Pujoni
- Laboratório de Limnologia, Ecotoxicologia e Ecologia Aquática, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais-UFMG, Belo Horizonte, MG, Brazil
| | - Sérgia M S Magalhães
- Departamento de Farmácia Social, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Fernando Barbosa
- Laboratório de Toxicologia e Essencialidade de Metais, Faculdade de Ciências Farmacêuticas de Ribeirão Preto-USP, Ribeirão Preto, 14040-903, SP, Brazil
| | - Francisco A R Barbosa
- Laboratório de Limnologia, Ecotoxicologia e Ecologia Aquática, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais-UFMG, Belo Horizonte, MG, Brazil
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13
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Miazek K, Iwanek W, Remacle C, Richel A, Goffin D. Effect of Metals, Metalloids and Metallic Nanoparticles on Microalgae Growth and Industrial Product Biosynthesis: A Review. Int J Mol Sci 2015; 16:23929-69. [PMID: 26473834 PMCID: PMC4632732 DOI: 10.3390/ijms161023929] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 09/11/2015] [Accepted: 09/24/2015] [Indexed: 12/29/2022] Open
Abstract
Microalgae are a source of numerous compounds that can be used in many branches of industry. Synthesis of such compounds in microalgal cells can be amplified under stress conditions. Exposure to various metals can be one of methods applied to induce cell stress and synthesis of target products in microalgae cultures. In this review, the potential of producing diverse biocompounds (pigments, lipids, exopolymers, peptides, phytohormones, arsenoorganics, nanoparticles) from microalgae cultures upon exposure to various metals, is evaluated. Additionally, different methods to alter microalgae response towards metals and metal stress are described. Finally, possibilities to sustain high growth rates and productivity of microalgal cultures in the presence of metals are discussed.
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Affiliation(s)
- Krystian Miazek
- AgricultureIsLife Platform, University of Liege-Gembloux Agro-Bio Tech, Passage des Déportés 2, Gembloux B-5030, Belgium.
| | - Waldemar Iwanek
- Faculty of Mathematics and Natural Sciences, the Jan Kochanowski University in Kielce, Swietokrzyska 15, Kielce 25-406, Poland.
| | - Claire Remacle
- Genetics and Physiology of Microalgae, Institute of Botany, University of Liege, B22, 27, Bld du Rectorat, Liège B-4000, Belgium.
| | - Aurore Richel
- Unit of Biological and Industrial Chemistry, University of Liege-Gembloux Agro-Bio Tech, Passage des Déportés 2, Gembloux B-5030, Belgium.
| | - Dorothee Goffin
- Cellule Innovation et Créativité, University of Liege-Gembloux Agro-Bio Tech, Passage des Déportés 2, Gembloux B-5030, Belgium.
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14
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Farasin J, Andres J, Casiot C, Barbe V, Faerber J, Halter D, Heintz D, Koechler S, Lièvremont D, Lugan R, Marchal M, Plewniak F, Seby F, Bertin PN, Arsène-Ploetze F. Thiomonas sp. CB2 is able to degrade urea and promote toxic metal precipitation in acid mine drainage waters supplemented with urea. Front Microbiol 2015; 6:993. [PMID: 26441922 PMCID: PMC4585258 DOI: 10.3389/fmicb.2015.00993] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 09/07/2015] [Indexed: 11/13/2022] Open
Abstract
The acid mine drainage (AMD) in Carnoulès (France) is characterized by the presence of toxic metals such as arsenic. Several bacterial strains belonging to the Thiomonas genus, which were isolated from this AMD, are able to withstand these conditions. Their genomes carry several genomic islands (GEIs), which are known to be potentially advantageous in some particular ecological niches. This study focused on the role of the “urea island” present in the Thiomonas CB2 strain, which carry the genes involved in urea degradation processes. First, genomic comparisons showed that the genome of Thiomonas sp. CB2, which is able to degrade urea, contains a urea genomic island which is incomplete in the genome of other strains showing no urease activity. The urease activity of Thiomonas sp. CB2 enabled this bacterium to maintain a neutral pH in cell cultures in vitro and prevented the occurrence of cell death during the growth of the bacterium in a chemically defined medium. In AMD water supplemented with urea, the degradation of urea promotes iron, aluminum and arsenic precipitation. Our data show that ureC was expressed in situ, which suggests that the ability to degrade urea may be expressed in some Thiomonas strains in AMD, and that this urease activity may contribute to their survival in contaminated environments.
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Affiliation(s)
- Julien Farasin
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Jérémy Andres
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Corinne Casiot
- Laboratoire Hydrosciences Montpellier, UMR 5569, Centre National de la Recherche Scientifique-UM I, UM II, IRD, Université Montpellier 2, CCMSE Montpellier, France
| | - Valérie Barbe
- Laboratoire de Biologie Moléculaire Pour l'Etude des Génomes, CEA-IG-Genoscope Evry, France
| | - Jacques Faerber
- Institut de Physique et de Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 Strasbourg, France
| | - David Halter
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Dimitri Heintz
- Plateforme Métabolomique, UPR2357, Centre National de la Recherche Scientifique, Institut de Biologie Moléculaire des Plantes, Institut de Botanique Strasbourg, France
| | - Sandrine Koechler
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Didier Lièvremont
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Raphael Lugan
- Plateforme Métabolomique, UPR2357, Centre National de la Recherche Scientifique, Institut de Biologie Moléculaire des Plantes, Institut de Botanique Strasbourg, France
| | - Marie Marchal
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Frédéric Plewniak
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | | | - Philippe N Bertin
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
| | - Florence Arsène-Ploetze
- Laboratoire Génétique Moléculaire, Génomique et Microbiologie, UMR7156, Université de Strasbourg - Centre National de la Recherche Scientifique, Institut de Botanique Strasbourg, France
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15
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Murínová S, Dercová K. Response mechanisms of bacterial degraders to environmental contaminants on the level of cell walls and cytoplasmic membrane. Int J Microbiol 2014; 2014:873081. [PMID: 25057269 PMCID: PMC4099092 DOI: 10.1155/2014/873081] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/12/2014] [Accepted: 05/27/2014] [Indexed: 11/18/2022] Open
Abstract
Bacterial strains living in the environment must cope with the toxic compounds originating from humans production. Surface bacterial structures, cell wall and cytoplasmic membrane, surround each bacterial cell and create selective barriers between the cell interior and the outside world. They are a first site of contact between the cell and toxic compounds. Organic pollutants are able to penetrate into cytoplasmic membrane and affect membrane physiological functions. Bacteria had to evolve adaptation mechanisms to counteract the damage originated from toxic contaminants and to prevent their accumulation in cell. This review deals with various adaptation mechanisms of bacterial cell concerning primarily the changes in cytoplasmic membrane and cell wall. Cell adaptation maintains the membrane fluidity status and ratio between bilayer/nonbilayer phospholipids as well as the efflux of toxic compounds, protein repair mechanisms, and degradation of contaminants. Low energy consumption of cell adaptation is required to provide other physiological functions. Bacteria able to survive in toxic environment could help us to clean contaminated areas when they are used in bioremediation technologies.
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Affiliation(s)
- Slavomíra Murínová
- Department of Biochemical Technology, Faculty of Chemical and Food Technology, Institute of Biotechnology and Food Science, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia
- Water Research Institute, Nábrežie arm. gen. L. Svobodu 5, 812 49 Bratislava, Slovakia
| | - Katarína Dercová
- Department of Biochemical Technology, Faculty of Chemical and Food Technology, Institute of Biotechnology and Food Science, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia
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16
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Biodegradation of octyltin compounds by Cochliobolus lunatus and influence of xenobiotics on fungal fatty acid composition. Process Biochem 2014. [DOI: 10.1016/j.procbio.2013.12.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Delavat F, Lett MC, Lièvremont D. Yeast and bacterial diversity along a transect in an acidic, As-Fe rich environment revealed by cultural approaches. THE SCIENCE OF THE TOTAL ENVIRONMENT 2013; 463-464:823-828. [PMID: 23859900 DOI: 10.1016/j.scitotenv.2013.06.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 05/29/2013] [Accepted: 06/05/2013] [Indexed: 06/02/2023]
Abstract
Acid mine drainages (AMDs) are often thought to harbour low biodiversity, yet little is known about the diversity distribution along the drainages. Using culture-dependent approaches, the microbial diversity from the Carnoulès AMD sediment was investigated for the first time along a transect showing progressive environmental stringency decrease. In total, 20 bacterial genera were detected, highlighting a higher bacterial diversity than previously thought. Moreover, this approach led to the discovery of 16 yeast species, demonstrating for the first time the presence of this important phylogenetic group in this AMD. All in all, the location of the microbes along the transect helps to better understand their distribution in a pollution gradient.
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Affiliation(s)
- François Delavat
- UMR7156 Université de Strasbourg/CNRS, Génétique Moléculaire, Génomique, Microbiologie, Institut de Botanique, 28 rue Goethe, Strasbourg 67000, France.
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18
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Słaba M, Gajewska E, Bernat P, Fornalska M, Długoński J. Adaptive alterations in the fatty acids composition under induced oxidative stress in heavy metal-tolerant filamentous fungus Paecilomyces marquandii cultured in ascorbic acid presence. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:3423-34. [PMID: 23132407 DOI: 10.1007/s11356-012-1281-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 10/23/2012] [Indexed: 05/05/2023]
Abstract
The ability of the heavy metal-tolerant fungus Paecilomyces marquandii to modulate whole cells fatty acid composition and saturation in response to IC50 of Cd, Pb, Zn, Ni, and Cu was studied. Cadmium and nickel caused the most significant growth reduction. In the mycelia cultured with all tested metals, with the exception of nickel, a rise in the fatty acid unsaturation was noted. The fungus exposure to Pb, Cu, and Ni led to significantly higher lipid peroxidation. P. marquandii incubated in the presence of the tested metals responded with an increase in the level of linoleic acid and escalation of electrolyte leakage. The highest efflux of electrolytes was caused by lead. In these conditions, the fungus was able to bind up to 100 mg g(-1) of lead, whereas the content of the other metals in the mycelium was significantly lower and reached from 3.18 mg g(-1) (Cu) to 15.21 mg g(-1) (Zn). Additionally, it was shown that ascorbic acid at the concentration of 1 mM protected fungal growth and prevented the changes in the fatty acid composition and saturation but did not alleviate lipid peroxidation or affect the increased permeability of membranes after lead exposure. Pro-oxidant properties of ascorbic acid in the copper-stressed cells manifested strong growth inhibition and enhanced metal accumulation as a result of membrane damage. Toxic metals action caused cellular modulations, which might contributed to P. marquandii tolerance to the studied metals. Moreover, these changes can enhance metal removal from contaminated environment.
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Affiliation(s)
- Mirosława Słaba
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Łódź, Banacha 12/16, 90-237 Łódź, Poland
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Halter D, Goulhen-Chollet F, Gallien S, Casiot C, Hamelin J, Gilard F, Heintz D, Schaeffer C, Carapito C, Van Dorsselaer A, Tcherkez G, Arsène-Ploetze F, Bertin PN. In situ proteo-metabolomics reveals metabolite secretion by the acid mine drainage bio-indicator, Euglena mutabilis. ISME JOURNAL 2012; 6:1391-402. [PMID: 22237547 DOI: 10.1038/ismej.2011.198] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Euglena mutabilis is a photosynthetic protist found in acidic aquatic environments such as peat bogs, volcanic lakes and acid mine drainages (AMDs). Through its photosynthetic metabolism, this protist is supposed to have an important role in primary production in such oligotrophic ecosystems. Nevertheless, the exact contribution of E. mutabilis in organic matter synthesis remains unclear and no evidence of metabolite secretion by this protist has been established so far. Here we combined in situ proteo-metabolomic approaches to determine the nature of the metabolites accumulated by this protist or potentially secreted into an AMD. Our results revealed that the secreted metabolites are represented by a large number of amino acids, polyamine compounds, urea and some sugars but no fatty acids, suggesting a selective organic matter contribution in this ecosystem. Such a production may have a crucial impact on the bacterial community present on the study site, as it has been suggested previously that prokaryotes transport and recycle in situ most of the metabolites secreted by E. mutabilis. Consequently, this protist may have an indirect but important role in AMD ecosystems but also in other ecological niches often described as nitrogen-limited.
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Affiliation(s)
- David Halter
- UMR7156 Université de Strasbourg/CNRS, Génétique Moléculaire, Génomique et Microbiologie, Département Micro-organismes, Génomes, Environnement, Strasbourg, France
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