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Zhang S, Zhang X, Yuan Y, Li K, Liu H. Renewable biohydrogen production from Clostridium sp. LQ25 using different forms of ferric as electron acceptor. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 855:158911. [PMID: 36152847 DOI: 10.1016/j.scitotenv.2022.158911] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/09/2022] [Accepted: 09/17/2022] [Indexed: 06/16/2023]
Abstract
Clostridium sp. LQ25 was cultured in different forms of ferric (ferric citrate and ferric hydroxide) as electron acceptors to investigate growth, ferric reduction, hydrogen production, fermentation products and fermentation process. The growth of the strain LQ25 detected by protein was 82.8 ± 2.1 mg/L and 73.5 ± 1.7 mg/L using ferric citrate and ferric hydroxide as electron acceptors, which was 33.3 % and 18.4 % higher than without ferric, respectively. The accumulation concentration of Fe(II) was 9.0 ± 0.6 mg/L and 5.0 ± 0.2 mg/L when using ferric citrate and ferric hydroxide as electron acceptors, and ferric citrate was 1.8-fold higher than ferric hydroxide, which indicated that the ability of ferric reduction was higher using ferric citrate as electron acceptor. The hydrogen production of strain LQ25 was 238.0 ± 1.0 mmol/mol glucose and 113.0 ± 1.3 mmol/mol glucose under condition of ferric citrate and ferric hydroxide as electron acceptors, which was 2.6 and 1.2-fold higher than without ferric, respectively. The growth and hydrogen production of strain LQ25 was promoted by using ferric as electron acceptor, while the fermentation type of strain did not change and was always butyrate type. The differential expression of the genes of strain LQ25 was significant when using ferric as electron acceptor, mainly in NADH and PFL pathway. This study provided preliminary evidence for hydrogen production by Clostridium sp. LQ25 in the presence of electron acceptor.
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Affiliation(s)
- Shan Zhang
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, China
| | - Xiaodan Zhang
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, China
| | - Yuan Yuan
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, China
| | - Kaiqiang Li
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, China
| | - Hongyan Liu
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, China.
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Poladyan A, Blbulyan S, Semashko T, Dziameshka V, Zhukouskaya L, Trchоunian A. Application of organic waste glycerol to produce crude extracts of bacterial cells and microbial hydrogenase-the anode enzymes of bio-electrochemical systems. FEMS Microbiol Lett 2021; 367:5817844. [PMID: 32267913 DOI: 10.1093/femsle/fnaa056] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 03/26/2020] [Indexed: 01/08/2023] Open
Abstract
Glycerol is an organic waste material that can be used for the production of microbial biomass, consequently providing valuable biocatalysts promoting the generation of electrical current in microbial fuel cells (MFCs). [NiFe]-Hydrogenases (Hyds) of Escherichia coli and Ralstonia eutropha may be applied as potential anode biocatalysts in MFCs. In this study, E. coli K12 whole cells or crude extracts and R. eutropha HF649 synthesizing Strep-tagged membrane-bound Hyds (MBH) were evaluated as anode enzymes in a bioelectrochemical system. The samples were immobilized on the sensors with polyvinyl acetate support. Mediators like ferrocene and its derivatives (ferrocene-carboxy-aldehyde, ferrocene-carboxylic acid, methyl-ferrocene-methanol) were employed. The maximal level of bioelectrocatalytic activity of Hyds was demonstrated at 500 mV voltage. Depending on the mediator and biocatalyst, current strength varied from 5 to 42 μA. Introduction of ferrocene-carboxylic acid enhanced current strength; moreover, the current flow was directly correlated with H2 concentration. The maximal value (up to 150 μA) of current strength was achieved with a 2-fold hydrogen supply. It may be inferred that Hyds are efficiently produced by E. coli and R. eutropha grown on glycerol, while ferrocene derivatives act as agents mediating the electrochemical activity of Hyds.
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Affiliation(s)
- Anna Poladyan
- Department of Biochemistry, Microbiology and Biotechnology, Yerevan State University, 1 A. Manoukian Str., 0025 Yerevan, Armenia
| | - Syuzanna Blbulyan
- Department of Biochemistry, Microbiology and Biotechnology, Yerevan State University, 1 A. Manoukian Str., 0025 Yerevan, Armenia
| | - Tatiana Semashko
- Institute of Microbiology, NAS Belarus, 2 Kuprevich Str., 220141 Minsk, Belarus
| | - Volha Dziameshka
- Institute of Microbiology, NAS Belarus, 2 Kuprevich Str., 220141 Minsk, Belarus
| | | | - Armen Trchоunian
- Department of Biochemistry, Microbiology and Biotechnology, Yerevan State University, 1 A. Manoukian Str., 0025 Yerevan, Armenia.,Research Institute of Biology, Biology Faculty, Yerevan State University, 1 A. Manoukian Str., 0025 Yerevan, Armenia
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3
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Gevorgyan H, Trchounian A, Trchounian K. Formate and potassium ions affectEscherichia coliproton ATPase activity at low pH during mixed carbon fermentation. IUBMB Life 2020; 72:915-921. [DOI: 10.1002/iub.2219] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 12/09/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Heghine Gevorgyan
- Department of Biochemistry, Microbiology and Biotechnology, Faculty of BiologyYerevan State University Yerevan Armenia
- Scientific‐Research Institute of Biology, Faculty of BiologyYerevan State University Yerevan Armenia
- Microbial Biotechnologies and Biofuel Innovation CenterYerevan State University Yerevan Armenia
| | - Armen Trchounian
- Department of Biochemistry, Microbiology and Biotechnology, Faculty of BiologyYerevan State University Yerevan Armenia
- Scientific‐Research Institute of Biology, Faculty of BiologyYerevan State University Yerevan Armenia
| | - Karen Trchounian
- Department of Biochemistry, Microbiology and Biotechnology, Faculty of BiologyYerevan State University Yerevan Armenia
- Scientific‐Research Institute of Biology, Faculty of BiologyYerevan State University Yerevan Armenia
- Microbial Biotechnologies and Biofuel Innovation CenterYerevan State University Yerevan Armenia
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4
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Karapetyan L, Pinske C, Sawers G, Trchounian A, Trchounian K. Influence ofC4‐Dcutransporters on hydrogenase and formate dehydrogenase activities in stationary phase‐grown fermentingEscherichia coli. IUBMB Life 2020; 72:1680-1685. [DOI: 10.1002/iub.2290] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 03/30/2020] [Indexed: 11/06/2022]
Affiliation(s)
- Lusine Karapetyan
- Department of Biochemistry, Microbiology and Biotechnology, Faculty of BiologyYerevan State University Yerevan Armenia
- Scientific‐Research Institute of Biology Faculty of BiologyYerevan State University Yerevan Armenia
- Microbial Biotechnologies and Biofuel Innovation CenterYerevan State University Yerevan Armenia
| | - Constanze Pinske
- Institute of MicrobiologyMartin‐Luther University Halle‐Wittenberg Halle (Saale) Germany
| | - Gary Sawers
- Institute of MicrobiologyMartin‐Luther University Halle‐Wittenberg Halle (Saale) Germany
| | - Armen Trchounian
- Department of Biochemistry, Microbiology and Biotechnology, Faculty of BiologyYerevan State University Yerevan Armenia
- Scientific‐Research Institute of Biology Faculty of BiologyYerevan State University Yerevan Armenia
| | - Karen Trchounian
- Department of Biochemistry, Microbiology and Biotechnology, Faculty of BiologyYerevan State University Yerevan Armenia
- Scientific‐Research Institute of Biology Faculty of BiologyYerevan State University Yerevan Armenia
- Microbial Biotechnologies and Biofuel Innovation CenterYerevan State University Yerevan Armenia
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Lacasse MJ, Sebastiampillai S, Côté JP, Hodkinson N, Brown ED, Zamble DB. A whole-cell, high-throughput hydrogenase assay to identify factors that modulate [NiFe]-hydrogenase activity. J Biol Chem 2019; 294:15373-15385. [PMID: 31455635 DOI: 10.1074/jbc.ra119.008101] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 08/08/2019] [Indexed: 12/25/2022] Open
Abstract
[NiFe]-hydrogenases have attracted attention as potential therapeutic targets or components of a hydrogen-based economy. [NiFe]-hydrogenase production is a complicated process that requires many associated accessory proteins that supply the requisite cofactors and substrates. Current methods for measuring hydrogenase activity have low throughput and often require specialized conditions and reagents. In this work, we developed a whole-cell high-throughput hydrogenase assay based on the colorimetric reduction of benzyl viologen to explore the biological networks of these enzymes in Escherichia coli We utilized this assay to screen the Keio collection, a set of nonlethal single-gene knockouts in E. coli BW25113. The results of this screen highlighted the assay's specificity and revealed known components of the intricate network of systems that underwrite [NiFe]-hydrogenase activity, including nickel homeostasis and formate dehydrogenase activities as well as molybdopterin and selenocysteine biosynthetic pathways. The screen also helped identify several new genetic components that modulate hydrogenase activity. We examined one E. coli strain with undetectable hydrogenase activity in more detail (ΔeutK), finding that nickel delivery to the enzyme active site was completely abrogated, and tracked this effect to an ancillary and unannotated lack of the fumarate and nitrate reduction (FNR) anaerobic regulatory protein. Collectively, these results demonstrate that the whole-cell assay developed here can be used to uncover new information about bacterial [NiFe]-hydrogenase production and to probe the cellular components of microbial nickel homeostasis.
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Affiliation(s)
- Michael J Lacasse
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | | | - Jean-Philippe Côté
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8N 3Z5, Canada.,Michael G. DeGroote Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
| | - Nicholas Hodkinson
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Eric D Brown
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8N 3Z5, Canada.,Michael G. DeGroote Institute of Infectious Disease Research, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
| | - Deborah B Zamble
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada .,Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada
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Gevorgyan H, Trchounian A, Trchounian K. Understanding the Role ofEscherichia coliHydrogenases and Formate Dehydrogenases in the FOF1-ATPase Activity during the Mixed Acid Fermentation of Mixture of Carbon Sources. IUBMB Life 2018; 70:1040-1047. [DOI: 10.1002/iub.1915] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 06/16/2018] [Accepted: 06/25/2018] [Indexed: 02/02/2023]
Affiliation(s)
- Heghine Gevorgyan
- Department of Biochemistry, Microbiology and Biotechnology; Faculty of Biology, Yerevan State University; Yerevan Armenia
| | - Armen Trchounian
- Department of Biochemistry, Microbiology and Biotechnology; Faculty of Biology, Yerevan State University; Yerevan Armenia
- Scientific-Research Institute of Biology, Faculty of Biology; Yerevan State University; Yerevan Armenia
| | - Karen Trchounian
- Scientific-Research Institute of Biology, Faculty of Biology; Yerevan State University; Yerevan Armenia
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7
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Current state and perspectives in hydrogen production by Escherichia coli: roles of hydrogenases in glucose or glycerol metabolism. Appl Microbiol Biotechnol 2018; 102:2041-2050. [DOI: 10.1007/s00253-018-8752-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 12/28/2017] [Accepted: 12/29/2017] [Indexed: 01/07/2023]
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Jia R, Li L, Qu D, Mi N. Enhanced iron(III) reduction following amendment of paddy soils with biochar and glucose modified biochar. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:91-103. [PMID: 27858276 DOI: 10.1007/s11356-016-8081-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 11/08/2016] [Indexed: 06/06/2023]
Abstract
Although biochar application to paddy fields has been widely studied, its effects on Fe(III) reduction have not yet been investigated. Paddy soil slurry and soil microbial inoculation incubation were conducted with unmodified biochar (UMB) or glucose-modified biochar (GMB) additions at different particle sizes. The Fe(II) concentration and pH value were determined regularly, and Fe(III) reducing capacity (FeRC) was evaluated by modeling. Fe(III) reduction potential (a) was increased by 0-1.96 mg g-1 in response to UMBs addition, and a more remarkable increase in a was related to the decrease of particle size. The dissolved organic carbon of UMBs was responsible for the majority of the biochar reducing capacity. UMBs addition increased the contribution of free Fe and nitrate nitrogen to FeRC, while it decreased that of available phosphorus. Moreover, GMBs led to greater promotion of FeRC than the corresponding UMBs, with an increase in a of 2.9-16% in soil slurry and reduction rate of 13-35% in microbial inoculation incubation. The maximum Fe(III) reduction rate (V max) with GMBs addition was faster or invariable than UMBs, while the time to V max (T Vmax) was shorter or stable. The effect of GMBs on Fe(III) reduction was less sensitive as GMB particle size increased. Compared with UMBs addition, pH declined remarkably in response to GMBs. These findings suggest that GMBs can effectively stimulate Fe(III) reduction in paddy fields, while simultaneously alleviating the pH increase usually caused by pristine biochar application.
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Affiliation(s)
- Rong Jia
- State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi Province, China
- College of Natural Resources and Environment, Northwest A&F University, No. 3 Taicheng Road, Yangling, Shaanxi Province, 712100, China
| | - Lina Li
- State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi Province, China
- College of Natural Resources and Environment, Northwest A&F University, No. 3 Taicheng Road, Yangling, Shaanxi Province, 712100, China
| | - Dong Qu
- State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi Province, China.
- College of Natural Resources and Environment, Northwest A&F University, No. 3 Taicheng Road, Yangling, Shaanxi Province, 712100, China.
| | - Nana Mi
- College of Natural Resources and Environment, Northwest A&F University, No. 3 Taicheng Road, Yangling, Shaanxi Province, 712100, China
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9
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The structurally unique photosynthetic Chlorella variabilis NC64A hydrogenase does not interact with plant-type ferredoxins. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017. [DOI: 10.1016/j.bbabio.2017.06.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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10
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Soo CS, Yap WS, Hon WM, Ramli N, Md Shah UK, Phang LY. Improvement of hydrogen yield of ethanol-producing Escherichia coli recombinants in acidic conditions. ELECTRON J BIOTECHN 2017. [DOI: 10.1016/j.ejbt.2016.12.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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11
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Blbulyan S, Trchounian A. Impact of membrane-associated hydrogenases on the FOF1-ATPase in Escherichia coli during glycerol and mixed carbon fermentation: ATPase activity and its inhibition by N,N′-dicyclohexylcarbodiimide in the mutants lacking hydrogenases. Arch Biochem Biophys 2015; 579:67-72. [DOI: 10.1016/j.abb.2015.05.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 05/28/2015] [Accepted: 05/29/2015] [Indexed: 10/23/2022]
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12
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Peters JW, Schut GJ, Boyd ES, Mulder DW, Shepard EM, Broderick JB, King PW, Adams MWW. [FeFe]- and [NiFe]-hydrogenase diversity, mechanism, and maturation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1853:1350-69. [PMID: 25461840 DOI: 10.1016/j.bbamcr.2014.11.021] [Citation(s) in RCA: 268] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 11/10/2014] [Accepted: 11/16/2014] [Indexed: 11/29/2022]
Abstract
The [FeFe]- and [NiFe]-hydrogenases catalyze the formal interconversion between hydrogen and protons and electrons, possess characteristic non-protein ligands at their catalytic sites and thus share common mechanistic features. Despite the similarities between these two types of hydrogenases, they clearly have distinct evolutionary origins and likely emerged from different selective pressures. [FeFe]-hydrogenases are widely distributed in fermentative anaerobic microorganisms and likely evolved under selective pressure to couple hydrogen production to the recycling of electron carriers that accumulate during anaerobic metabolism. In contrast, many [NiFe]-hydrogenases catalyze hydrogen oxidation as part of energy metabolism and were likely key enzymes in early life and arguably represent the predecessors of modern respiratory metabolism. Although the reversible combination of protons and electrons to generate hydrogen gas is the simplest of chemical reactions, the [FeFe]- and [NiFe]-hydrogenases have distinct mechanisms and differ in the fundamental chemistry associated with proton transfer and control of electron flow that also help to define catalytic bias. A unifying feature of these enzymes is that hydrogen activation itself has been restricted to one solution involving diatomic ligands (carbon monoxide and cyanide) bound to an Fe ion. On the other hand, and quite remarkably, the biosynthetic mechanisms to produce these ligands are exclusive to each type of enzyme. Furthermore, these mechanisms represent two independent solutions to the formation of complex bioinorganic active sites for catalyzing the simplest of chemical reactions, reversible hydrogen oxidation. As such, the [FeFe]- and [NiFe]-hydrogenases are arguably the most profound case of convergent evolution. This article is part of a Special Issue entitled: Fe/S proteins: Analysis, structure, function, biogenesis and diseases.
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Affiliation(s)
- John W Peters
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Gerrit J Schut
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
| | - Eric S Boyd
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA
| | - David W Mulder
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO 80401, USA
| | - Eric M Shepard
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
| | - Joan B Broderick
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
| | - Paul W King
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO 80401, USA
| | - Michael W W Adams
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
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Förster AH, Gescher J. Metabolic Engineering of Escherichia coli for Production of Mixed-Acid Fermentation End Products. Front Bioeng Biotechnol 2014; 2:16. [PMID: 25152889 PMCID: PMC4126452 DOI: 10.3389/fbioe.2014.00016] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 05/09/2014] [Indexed: 01/25/2023] Open
Abstract
Mixed-acid fermentation end products have numerous applications in biotechnology. This is probably the main driving force for the development of multiple strains that are supposed to produce individual end products with high yields. The process of engineering Escherichia coli strains for applied production of ethanol, lactate, succinate, or acetate was initiated several decades ago and is still ongoing. This review follows the path of strain development from the general characteristics of aerobic versus anaerobic metabolism over the regulatory machinery that enables the different metabolic routes. Thereafter, major improvements for broadening the substrate spectrum of E. coli toward cheap carbon sources like molasses or lignocellulose are highlighted before major routes of strain development for the production of ethanol, acetate, lactate, and succinate are presented.
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Affiliation(s)
- Andreas H Förster
- Institute of Applied Biosciences, Karlsruhe Institute of Technology , Karlsruhe , Germany
| | - Johannes Gescher
- Institute of Applied Biosciences, Karlsruhe Institute of Technology , Karlsruhe , Germany
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Metabolic engineering of Escherichia coli to enhance hydrogen production from glycerol. Appl Microbiol Biotechnol 2014; 98:4757-70. [PMID: 24615384 DOI: 10.1007/s00253-014-5600-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 02/05/2014] [Accepted: 02/06/2014] [Indexed: 12/20/2022]
Abstract
Glycerol is an attractive carbon source for biofuel production since it is cheap and abundant due to the increasing demand for renewable and clean energy sources, which includes production of biodiesel. This research aims to enhance hydrogen production by Escherichia coli from glycerol by manipulating its metabolic pathways via targeted deletions. Since our past strain, which had been engineered for producing hydrogen from glucose, was not suitable for producing hydrogen from glycerol, we rescreened 14 genes related to hydrogen production and glycerol metabolism. We found that 10 single knockouts are beneficial for enhanced hydrogen production from glycerol, namely, frdC (encoding for furmarate reductase), ldhA (lactate dehydrogenase), fdnG (formate dehydrogenase), ppc (phosphoenolpyruvate carboxylase), narG (nitrate reductase), focA (formate transporter), hyaB (the large subunit of hydrogenase 1), aceE (pyruvate dehydrogenase), mgsA (methylglyoxal synthase), and hycA (a regulator of the transcriptional regulator FhlA). On that basis, we created multiple knockout strains via successive P1 transductions. Simultaneous knockouts of frdC, ldhA, fdnG, ppc, narG, mgsA, and hycA created the best strain that produced 5-fold higher hydrogen and had a 5-fold higher hydrogen yield than the parent strain. The engineered strain also reached the theoretical maximum yield of 1 mol H2/mol glycerol after 48 h. Under low partial pressure fermentation, the strain grew over 2-fold faster, indicating faster utilization of glycerol and production of hydrogen. By combining metabolic engineering and low partial pressure fermentation, hydrogen production from glycerol was enhanced significantly.
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Trchounian A, Gary Sawers R. Novel insights into the bioenergetics of mixed-acid fermentation: Can hydrogen and proton cycles combine to help maintain a proton motive force? IUBMB Life 2013; 66:1-7. [DOI: 10.1002/iub.1236] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 12/04/2013] [Accepted: 12/08/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Armen Trchounian
- Department of Microbiology; Plants and Microbes Biotechnology, Faculty of Biology, Yerevan State University; Yerevan Armenia
| | - R. Gary Sawers
- Institute of Biology/Microbiology; Martin Luther University of Halle-Wittenberg; Halle (Saale) Germany
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16
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Contribution of hydrogenase 2 to stationary phase H2 production by Escherichia coli during fermentation of glycerol. Cell Biochem Biophys 2013; 66:103-8. [PMID: 23090790 DOI: 10.1007/s12013-012-9458-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Escherichia coli has four hydrogenases (Hyd), three genes of which are encoded by the hya, hyb, and hyc operons. The proton-reducing and hydrogen-oxidizing activities of Hyd-2 (hyb) were analyzed in whole cells grown to stationary phase and cell extracts, respectively, during glycerol fermentation using novel double mutants. H2 production rate at pH 7.5 was decreased by ~3.5- and ~7-fold in hya and hyc (HDK 103) or hyb and hyc (HDK 203) operon double mutants, respectively, compared with the wild type. At pH 6.5, H2 production decreased by ~2- and ~5-fold in HDK103 and HDK203, respectively, compared with the wild type. At pH 5.5, H2 production was reduced by ~4.5-fold in the mutants compared with the wild type. The total hydrogen-oxidizing activity was shown to depend on the pH of the growth medium in agreement with previous findings and was significantly reduced in the HDK103 or HDK203 mutants. At pH 7.5, Hyd-2 activity was 0.26 U (mg protein)(-1) and Hyd-1 activity was 0.1 U (mg protein)(-1). As the pH of the growth medium decreased to 6.5, Hyd-2 activity was 0.16 U (mg protein)(-1), and Hyd-1 was absent. Surprisingly, at pH 5.5, there was an increase in Hyd-2 activity (0.33 U mg protein)(-1) but not in that of Hyd-1. These findings show a major contribution of Hyd-2 to H2 production during glycerol fermentation that resulted from altered metabolism which surprisingly influenced proton reduction.
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Poladyan A, Trchounian K, Sawers RG, Trchounian A. Hydrogen-oxidizing hydrogenases 1 and 2 ofEscherichia coliregulate the onset of hydrogen evolution and ATPase activity, respectively, during glucose fermentation at alkaline pH. FEMS Microbiol Lett 2013; 348:143-8. [DOI: 10.1111/1574-6968.12281] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 09/17/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
- Anna Poladyan
- Department of Microbiology, Plants and Microbes Biotechnology; Faculty of Biology; Yerevan State University; Yerevan Armenia
| | - Karen Trchounian
- Department of Biophysics; Faculty of Biology; Yerevan State University; Yerevan Armenia
- Institute of Biology/Microbiology; Martin Luther University of Halle-Wittenberg; Halle Germany
| | - R. Gary Sawers
- Institute of Biology/Microbiology; Martin Luther University of Halle-Wittenberg; Halle Germany
| | - Armen Trchounian
- Department of Microbiology, Plants and Microbes Biotechnology; Faculty of Biology; Yerevan State University; Yerevan Armenia
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Trchounian K, Trchounian A. Escherichia colimultiple [Ni-Fe]-hydrogenases are sensitive to osmotic stress during glycerol fermentation but at different pHs. FEBS Lett 2013; 587:3562-6. [DOI: 10.1016/j.febslet.2013.09.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Revised: 09/10/2013] [Accepted: 09/11/2013] [Indexed: 10/26/2022]
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19
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Trchounian A. Mechanisms for hydrogen production by different bacteria during mixed-acid and photo-fermentation and perspectives of hydrogen production biotechnology. Crit Rev Biotechnol 2013; 35:103-13. [DOI: 10.3109/07388551.2013.809047] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Hydrogenase activity and proton-motive force generation by Escherichia coli during glycerol fermentation. J Bioenerg Biomembr 2012; 45:253-60. [DOI: 10.1007/s10863-012-9498-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Accepted: 12/09/2012] [Indexed: 01/23/2023]
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Trchounian K. Transcriptional control of hydrogen production during mixed carbon fermentation by hydrogenases 4 (hyf) and 3 (hyc) in Escherichia coli. Gene 2012; 506:156-60. [DOI: 10.1016/j.gene.2012.06.084] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 06/25/2012] [Indexed: 01/07/2023]
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McNorton MM, Maier RJ. Roles of H2 uptake hydrogenases in Shigella flexneri acid tolerance. MICROBIOLOGY-SGM 2012; 158:2204-2212. [PMID: 22628482 DOI: 10.1099/mic.0.058248-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Hydrogenases play many roles in bacterial physiology, and use of H(2) by the uptake-type enzymes of animal pathogens is of particular interest. Hydrogenases have never been studied in the pathogen Shigella, so targeted mutant strains were individually generated in the two Shigella flexneri H(2)-uptake enzymes (Hya and Hyb) and in the H(2)-evolving enzyme (Hyc) to address their roles. Under anaerobic fermentative conditions, a Hya mutant strain (hya) was unable to oxidize H(2), while a Hyb mutant strain oxidized H(2) like the wild-type. A hyc strain oxidized more exogenously added hydrogen than the parent. Fluorescence ratio imaging with dye JC-1 (5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolylcarbocyanine iodide) showed that the parent strain generated a membrane potential 15 times greater than hya. The hya mutant was also by far the most acid-sensitive strain, being even more acid-sensitive than a mutant strain in the known acid-combating glutamate-dependent acid-resistance pathway (GDAR pathway). In severe acid-challenge experiments, the addition of glutamate to hya restored survivability, and this ability was attributed in part to the GDAR system (removes intracellular protons) by mutant strain (e.g. hya/gadBC double mutant) analyses. However, mutant strain phenotypes indicated that a larger portion of the glutamate-rescued acid tolerance was independent of GadBC. The acid tolerance of the hya strains was aided by adding chloride ions to the growth medium. The whole-cell Hya enzyme became more active upon acid exposure (20 min), based on assays of hyc. Indeed, the very high rates of Shigella H(2) oxidation by Hya in acid can supply each cell with 2.4×10(8) protons min(-1). Electrons generated from Hya-mediated H(2) oxidation at the inner membrane likely counteract cytoplasmic positive charge stress, while abundant proton pools deposited periplasmically likely repel proton influx during severe acid stress.
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Affiliation(s)
| | - Robert J Maier
- Department of Microbiology, University of Georgia, Athens, GA, USA
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