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ALIM MA, SUGA M, SHINOHARA H. Rapid and Highly Sensitive Electrochemical Technique for Cell Viability Assay via Monitoring of Intracellular NADH with New Double Mediator System. ELECTROCHEMISTRY 2021. [DOI: 10.5796/electrochemistry.21-00088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Mohammad Abdul ALIM
- Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj
| | - Minoru SUGA
- Faculty of Engineering, Academic Assembly, University of Toyama
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2
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Motabar D, Li J, Payne GF, Bentley WE. Mediated electrochemistry for redox-based biological targeting: entangling sensing and actuation for maximizing information transfer. Curr Opin Biotechnol 2021; 71:137-144. [PMID: 34364305 DOI: 10.1016/j.copbio.2021.07.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 07/02/2021] [Accepted: 07/14/2021] [Indexed: 02/06/2023]
Abstract
Biology and electronics are both expert at receiving, analyzing, and responding to information, yet they use entirely different information processing paradigms. Biology processes information using networks that are intrinsically molecular while electronics process information through circuits that control the flow of electrons. There is great interest in coupling the molecular logic of biology with the electronic logic of technology, and we suggest that redox (reduction-oxidation) is a uniquely suited modality for interfacing biology with electronics. Specifically, redox is a native biological modality and is accessible to electronics through electrodes. We summarize recent advances in mediated electrochemistry to direct information transfer into biological systems intentionally altering function, exposing it for more advanced interpretation, which can dramatically expand the biotechnological toolbox.
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Affiliation(s)
- Dana Motabar
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States; Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742 United States
| | - Jinyang Li
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States; Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742 United States
| | - Gregory F Payne
- Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742 United States.
| | - William E Bentley
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States; Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742 United States.
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3
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Simonis P, Garjonyte R, Stirke A. Mediated amperometry as a prospective method for the investigation of electroporation. Sci Rep 2020; 10:19094. [PMID: 33154473 PMCID: PMC7644768 DOI: 10.1038/s41598-020-76086-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 10/22/2020] [Indexed: 12/23/2022] Open
Abstract
Pulsed electric field effects induced in a membrane, as well as intracellular structures, depend on cell type, field and media parameters. To achieve desired outcomes, membranes should be permeabilized in a controlled manner, and thus efficiency of electroporation should be investigated in advance. Here, we present a framework for using mediated amperometry as a prospective method for the investigation of electroporation and its effects on cellular machinery. Whole-cell sensors with single mediator systems comprised of hydrophilic or lipophilic mediators were successfully employed to investigate membrane permeability as well as cellular responses. Exposure of yeast cells to single electric field pulse (τ = 300 µs, E = 16 kV/cm) resulted in up to tenfold increase of current strength mediated with hydrophilic mediators. Exposure to PEF resulted in decrease of menadione mediated current strength (from 138 ± 15 to 32 ± 15 nA), which could be completely compensated by supplementing electrolyte with NADH.
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Affiliation(s)
- Povilas Simonis
- State Research Institute, Center for Physical Sciences and Technology, Saulėtekio al. 3, Vilnius, Lithuania.
| | - Rasa Garjonyte
- State Research Institute, Center for Physical Sciences and Technology, Saulėtekio al. 3, Vilnius, Lithuania
| | - Arunas Stirke
- State Research Institute, Center for Physical Sciences and Technology, Saulėtekio al. 3, Vilnius, Lithuania
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4
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Progress in emerging techniques for characterization of immobilized viable whole-cell biocatalysts. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0243-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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5
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Electrochemical monitoring of native catalase activity in skin using skin covered oxygen electrode. Biosens Bioelectron 2017; 93:9-13. [DOI: 10.1016/j.bios.2017.01.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 12/20/2016] [Accepted: 01/02/2017] [Indexed: 11/17/2022]
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6
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Scanning electrochemical microscopy based evaluation of influence of pH on bioelectrochemical activity of yeast cells − Saccharomyces cerevisiae. Colloids Surf B Biointerfaces 2017; 149:1-6. [DOI: 10.1016/j.colsurfb.2016.09.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 09/23/2016] [Accepted: 09/26/2016] [Indexed: 11/19/2022]
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Mark C, Zór K, Heiskanen A, Dufva M, Emnéus J, Finnie C. Monitoring intra- and extracellular redox capacity of intact barley aleurone layers responding to phytohormones. Anal Biochem 2016; 515:1-8. [PMID: 27641112 DOI: 10.1016/j.ab.2016.09.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 09/12/2016] [Accepted: 09/14/2016] [Indexed: 11/29/2022]
Abstract
Redox regulation is important for numerous processes in plant cells including abiotic stress, pathogen defence, tissue development, seed germination and programmed cell death. However, there are few methods allowing redox homeostasis to be addressed in whole plant cells, providing insight into the intact in vivo environment. An electrochemical redox assay that applies the menadione-ferricyanide double mediator is used to assess changes in the intracellular and extracellular redox environment in living aleurone layers of barley (Hordeum vulgare cv. Himalaya) grains, which respond to the phytohormones gibberellic acid and abscisic acid. Gibberellic acid is shown to elicit a mobilisation of electrons as detected by an increase in the reducing capacity of the aleurone layers. By taking advantage of the membrane-permeable menadione/menadiol redox pair to probe the membrane-impermeable ferricyanide/ferrocyanide redox pair, the mobilisation of electrons was dissected into an intracellular and an extracellular, plasma membrane-associated component. The intracellular and extracellular increases in reducing capacity were both suppressed when the aleurone layers were incubated with abscisic acid. By probing redox levels in intact plant tissue, the method provides a complementary approach to assays of reactive oxygen species and redox-related enzyme activities in tissue extracts.
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Affiliation(s)
- Christina Mark
- Agricultural and Environmental Proteomics, Department of Systems Biology, Technical University of Denmark, DK-2800 Kgs.Lyngby, Denmark
| | - Kinga Zór
- Bioanalytics, Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kgs.Lyngby, Denmark
| | - Arto Heiskanen
- Bioanalytics, Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kgs.Lyngby, Denmark
| | - Martin Dufva
- Fluidic Array Systems and Technology, Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kgs.Lyngby, Denmark
| | - Jenny Emnéus
- Bioanalytics, Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kgs.Lyngby, Denmark
| | - Christine Finnie
- Agricultural and Environmental Proteomics, Department of Systems Biology, Technical University of Denmark, DK-2800 Kgs.Lyngby, Denmark; Carlsberg Research Laboratory, J.C. Jacobsens Gade 4, DK-1799 Copenhagen V, Denmark.
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Garjonyte R, Melvydas V, Malinauskas A. Mediated amperometry reveals different modes of yeast responses to sugars. Bioelectrochemistry 2015; 107:45-9. [PMID: 26523505 DOI: 10.1016/j.bioelechem.2015.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 10/20/2015] [Accepted: 10/23/2015] [Indexed: 11/28/2022]
Abstract
Menadione-mediated amperometry at carbon paste electrodes modified with various yeasts (Saccharomyces cerevisiae, Candida pulcherrima, Pichia guilliermondii and Debaryomyces hansenii) was employed to monitor redox activity inside the yeast cells induced by glucose, fructose, sucrose, maltose or galactose. Continuous measurements revealed distinct modes (transient or gradually increasing) of the current development during the first 2 to 3 min after subjection to glucose, fructose and sucrose at electrodes containing S. cerevisiae and non-Saccharomyces strains. Different modes (increasing or decreasing) of the current development after yeast subjection to galactose at electrodes with S. cerevisiae or D. hansenii and at electrodes with C. pulcherrima and P. guilliermondii suggested different mechanisms of galactose assimilation.
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Affiliation(s)
- Rasa Garjonyte
- Center for Physical Sciences and Technology, Institute of Chemistry, Gostauto 9, 01108 Vilnius, Lithuania.
| | - Vytautas Melvydas
- Nature Research Center, Institute of Botany, Zaliuju ezeru 49, 08406 Vilnius, Lithuania
| | - Albertas Malinauskas
- Center for Physical Sciences and Technology, Institute of Chemistry, Gostauto 9, 01108 Vilnius, Lithuania
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Prévoteau A, Geirnaert A, Arends JBA, Lannebère S, Van de Wiele T, Rabaey K. Hydrodynamic chronoamperometry for probing kinetics of anaerobic microbial metabolism--case study of Faecalibacterium prausnitzii. Sci Rep 2015; 5:11484. [PMID: 26127013 PMCID: PMC4486957 DOI: 10.1038/srep11484] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 05/12/2015] [Indexed: 01/26/2023] Open
Abstract
Monitoring in vitro the metabolic activity of microorganisms aids bioprocesses and enables better understanding of microbial metabolism. Redox mediators can be used for this purpose via different electrochemical techniques that are either complex or only provide non-continuous data. Hydrodynamic chronoamperometry using a rotating disc electrode (RDE) can alleviate these issues but was seldom used and is poorly characterized. The kinetics of Faecalibacterium prausnitzii A2-165, a beneficial gut microbe, were determined using a RDE with riboflavin as redox probe. This butyrate producer anaerobically ferments glucose and reduces riboflavin whose continuous monitoring on a RDE provided highly accurate kinetic measurements of its metabolism, even at low cell densities. The metabolic reaction rate increased linearly over a broad range of cell concentrations (9 × 10(4) to 5 × 10(7) cells.mL(-1)). Apparent Michaelis-Menten kinetics was observed with respect to riboflavin (KM = 6 μM; kcat = 5.3 × 10(5) s(-1), at 37 °C) and glucose (KM = 6 μM; kcat = 2.4 × 10(5) s(-1)). The short temporal resolution allows continuous monitoring of fast cellular events such as kinetics inhibition with butyrate. Furthermore, we detected for the first time riboflavin reduction by another potential probiotic, Butyricicoccus pullicaecorum. The ability of the RDE for fast, accurate, simple and continuous measurements makes it an ad hoc tool for assessing bioprocesses at high resolution.
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Affiliation(s)
- Antonin Prévoteau
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Annelies Geirnaert
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Jan B A Arends
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Sylvain Lannebère
- University of Coimbra, Department of Electrical Engineering - Instituto de Telecomunicações, Coimbra 3030-290, Portugal
| | - Tom Van de Wiele
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Korneel Rabaey
- Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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Rawson FJ, Downard AJ, Baronian KH. Electrochemical detection of intracellular and cell membrane redox systems in Saccharomyces cerevisiae. Sci Rep 2014; 4:5216. [PMID: 24910017 PMCID: PMC4048887 DOI: 10.1038/srep05216] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 05/15/2014] [Indexed: 11/09/2022] Open
Abstract
Redox mediators can interact with eukaryote cells at a number of different cell locations. While cell membrane redox centres are easily accessible, the redox centres of catabolism are situated within the cytoplasm and mitochondria and can be difficult to access. We have systematically investigated the interaction of thirteen commonly used lipophilic and hydrophilic mediators with the yeast Saccharomyces cerevisiae. A double mediator system is used in which ferricyanide is the final electron acceptor (the reporter mediator). After incubation of cells with mediators, steady state voltammetry of the ferri/ferrocyanide redox couple allows quantitation of the amount of mediator reduced by the cells. The plateau current at 425 mV vs Ag/AgCl gives the analytical signal. The results show that five of the mediators interact with at least three different trans Plasma Membrane Electron Transport systems (tPMETs), and that four mediators cross the plasma membrane to interact with cytoplasmic and mitochondrial redox molecules. Four of the mediators inhibit electron transfer from S. cerevisiae. Catabolic inhibitors were used to locate the cellular source of electrons for three of the mediators.
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Affiliation(s)
- Frankie J Rawson
- 1] Laboratory of Biophysics and Surfaces Analysis, School of Pharmacy, University of Nottingham, University Park, Nottingham B15 2TT UK [2] Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
| | - Alison J Downard
- 1] Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand [2] MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
| | - Keith H Baronian
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
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Mao L, Verwoerd WS. Exploration and comparison of inborn capacity of aerobic and anaerobic metabolisms of Saccharomyces cerevisiae for microbial electrical current production. Bioengineered 2013; 4:420-30. [PMID: 23969939 PMCID: PMC3937204 DOI: 10.4161/bioe.26222] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Saccharomyces cerevisiae possesses numerous advantageous biological features, such as being robust, easily handled, mostly non-pathogenic and having high catabolic rates, etc., which can be considered as merits for being used as a promising biocatalyst in microbial fuel cells (MFCs) for electricity generation. Previous studies have developed efficient MFC configurations to convert metabolic electron shuttles, such as cytoplasmic NADH, into usable electric current. However, no studies have elucidated the maximum potential of S. cerevisiae for current output and the underlying metabolic pathways, resulting from the interaction of thousands of reactions inside the cell during MFC operation. To address these two key issues, this study used in silico metabolic engineering techniques, flux balance analysis (FBA), and flux variability analysis with target flux minimization (FATMIN), to model the metabolic perturbation of S. cerevisiae under the MFC-energy extraction. The FBA results showed that, in the cytoplasmic NADH-dependent mediated electron transfer (MET) mode, S. cerevisiae had a potential to produce currents at up to 5.781 A/gDW for the anaerobic and 6.193 A/gDW for the aerobic environments. The FATMIN results showed that the aerobic and anaerobic metabolisms are resilient, relying on six and five contributing reactions respectively for high current production. Two reactions, catalyzed by glutamate dehydrogenase (NAD) (EC 1.4.1.3) and methylene tetrahydrofolate dehydrogenase (NAD) (EC 1.5.1.5), were shared in both current-production modes and contributed to over 80% of the identified maximum current outputs. It is also shown that the NADH regeneration was much less energy costly than biomass production rate. Taken together, our finding suggests that S. cerevisiae should receive more research effort for MFC electricity production.
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Affiliation(s)
- Longfei Mao
- Centre for Advanced Computational Solutions; Department of Molecular Biosciences; Lincoln University; Lincoln, New Zealand
| | - Wynand S Verwoerd
- Centre for Advanced Computational Solutions; Department of Molecular Biosciences; Lincoln University; Lincoln, New Zealand
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Rahimi M, Youn HY, McCanna DJ, Sivak JG, Mikkelsen SR. Application of cyclic biamperometry to viability and cytotoxicity assessment in human corneal epithelial cells. Anal Bioanal Chem 2013; 405:4975-9. [PMID: 23443523 DOI: 10.1007/s00216-013-6843-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Revised: 02/11/2013] [Accepted: 02/13/2013] [Indexed: 10/27/2022]
Abstract
The application of cyclic biamperometry to viability and cytotoxicity assessments of human corneal epithelial cells has been investigated. Electrochemical measurements have been compared in PBS containing 5.0 mM glucose and minimal essential growth medium. Three different lipophilic mediators including dichlorophenol indophenol, 2-methyl-1,4-naphthoquinone (also called menadione or vitamin K3) and N,N,N',N'-tetramethyl-p-phenylenediamine have been evaluated for shuttling electrons across the cell membrane to the external medium. Transfer of these electrons to ferricyanide in the extra cellular medium results in the accumulation of ferrocyanide. The amount of ferrocyanide is then determined using cyclic biamperometry and is related to the extent of cell metabolic activity and therefore cell viability. To illustrate cytotoxicity assessment of chemicals, hydrogen peroxide, benzalkonium chloride and sodium dodecyl sulfate have been chosen as sample toxins, the cytotoxicities of which have been evaluated and compared to values reported in the literature. Similar values have been reported using colorimetric assays; however, the simplicity of this electrochemical assay can, in principle, open the way to miniaturization onto lab-on-chip devices and its incorporation into tiered-testing approaches for cytotoxicity assessment.
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Affiliation(s)
- Mehdi Rahimi
- Department of Chemistry and Biochemistry, University of Waterloo, Waterloo, ON, Canada.
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13
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Heiskanen A, Coman V, Kostesha N, Sabourin D, Haslett N, Baronian K, Gorton L, Dufva M, Emnéus J. Bioelectrochemical probing of intracellular redox processes in living yeast cells—application of redox polymer wiring in a microfluidic environment. Anal Bioanal Chem 2013; 405:3847-58. [DOI: 10.1007/s00216-013-6709-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2012] [Revised: 12/10/2012] [Accepted: 01/09/2013] [Indexed: 01/13/2023]
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Tsai H, Tsai SH, Deng HW, Bor Fuh C. Assessment of Cell Viability Using the Chronoamperometric Method Based on Screen-Printed Electrodes. ELECTROANAL 2012. [DOI: 10.1002/elan.201200397] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Rawson FJ, Gross AJ, Garrett DJ, Downard AJ, Baronian K. Mediated electrochemical detection of electron transfer from the outer surface of the cell wall of Saccharomyces cerevisiae. Electrochem commun 2012. [DOI: 10.1016/j.elecom.2011.11.030] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Bongard RD, Myers CR, Lindemer BJ, Baumgardt S, Gonzalez FJ, Merker MP. Coenzyme Q(1) as a probe for mitochondrial complex I activity in the intact perfused hyperoxia-exposed wild-type and Nqo1-null mouse lung. Am J Physiol Lung Cell Mol Physiol 2012; 302:L949-58. [PMID: 22268123 DOI: 10.1152/ajplung.00251.2011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Previous studies showed that coenzyme Q(1) (CoQ(1)) reduction on passage through the rat pulmonary circulation was catalyzed by NAD(P)H:quinone oxidoreductase 1 (NQO1) and mitochondrial complex I, but that NQO1 genotype was not a factor in CoQ(1) reduction on passage through the mouse lung. The aim of the present study was to evaluate the complex I contribution to CoQ(1) reduction in the isolated perfused wild-type (NQO1(+/+)) and Nqo1-null (NQO1(-)/(-)) mouse lung. CoQ(1) reduction was measured as the steady-state pulmonary venous CoQ(1) hydroquinone (CoQ(1)H(2)) efflux rate during infusion of CoQ(1) into the pulmonary arterial inflow. CoQ(1)H(2) efflux rates during infusion of 50 μM CoQ(1) were not significantly different for NQO1(+/+) and NQO1(-/-) lungs (0.80 ± 0.03 and 0.68 ± 0.07 μmol·min(-1)·g lung dry wt(-1), respectively, P > 0.05). The mitochondrial complex I inhibitor rotenone depressed CoQ(1)H(2) efflux rates for both genotypes (0.19 ± 0.08 and 0.08 ± 0.04 μmol·min(-1)·g lung dry wt(-1) for NQO1(+/+) and NQO1(-/-), respectively, P < 0.05). Exposure of mice to 100% O(2) for 48 h also depressed CoQ(1)H(2) efflux rates in NQO1(+/+) and NQO1(-/-) lungs (0.43 ± 0.03 and 0.11 ± 0.04 μmol·min(-1)·g lung dry wt(-1), respectively, P < 0.05 by ANOVA). The impact of rotenone or hyperoxia on CoQ(1) redox metabolism could not be attributed to effects on lung wet-to-dry weight ratios, perfusion pressures, perfused surface areas, or total venous effluent CoQ(1) recoveries, the latter measured by spectrophotometry or mass spectrometry. Complex I activity in mitochondria-enriched lung fractions was depressed in hyperoxia-exposed lungs for both genotypes. This study provides new evidence for the potential utility of CoQ(1) as a nondestructive indicator of the impact of pharmacological or pathological exposures on complex I activity in the intact perfused mouse lung.
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Affiliation(s)
- Robert D Bongard
- Medical College of Wisconsin, Zablocki VAMC, Milwaukee, WI 53295, USA
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Nagamine K, Takahashi Y, Ino K, Shiku H, Matsue T. Influence of Tip Size on Single Yeast Cell Imaging Using Scanning Electrochemical Microscopy. ELECTROANAL 2011. [DOI: 10.1002/elan.201000595] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Monitoring of Cellular Dynamics with Electrochemical Detection Techniques. MODERN ASPECTS OF ELECTROCHEMISTRY 2011. [DOI: 10.1007/978-1-4614-0347-0_1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Kostesha N, Willquist K, Emneus J, van Niel EWJ. Probing the redox metabolism in the strictly anaerobic, extremely thermophilic, hydrogen-producing Caldicellulosiruptor saccharolyticus using amperometry. Extremophiles 2010; 15:77-87. [PMID: 21132340 DOI: 10.1007/s00792-010-0341-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Accepted: 11/12/2010] [Indexed: 10/18/2022]
Abstract
Changes in the redox metabolism in the anaerobic, extremely thermophilic, hydrogen-forming bacterium Caldicellulosiruptor saccharolyticus were probed for the first time in vivo using mediated amperometry with ferricyanide as a thermotolerant external mediator. Clear differences in the intracellular electron flow were observed when cells were supplied with different carbon sources. A higher electrochemical response was detected when cells were supplied with xylose than with sucrose or glucose. Moreover, using the mediated electrochemical method, it was possible to detect differences in the electron flow between cells harvested in the exponential and stationary growth phases. The electron flow of C. saccharolyticus was dependent on the NADH- and reduced ferredoxin generation flux and the competitive behavior of cytosolic and membrane-associated oxidoreductases. Sodium oxamate was used to inhibit the NADH-dependent lactate dehydrogenase, upon which more NADH was directed to membrane-associated enzymes for ferricyanide reduction, leading to a higher electrochemical signal. The method is noninvasive and the results presented here demonstrate that this method can be used to accurately detect changes in the intracellular electron flow and to probe redox enzyme properties of a strictly anaerobic thermophile in vivo.
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Affiliation(s)
- Natalie Kostesha
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads 345 East, 2800 Kgs. Lyngby, Denmark.
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Kostesha NV, Almeida JRM, Heiskanen AR, Gorwa-Grauslund MF, Hahn-Hägerdal B, Emnéus J. Electrochemical probing of in vivo 5-hydroxymethyl furfural reduction in Saccharomyces cerevisiae. Anal Chem 2010; 81:9896-901. [PMID: 19925001 DOI: 10.1021/ac901402m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, mediated amperometry was used to evaluate whether differences in intracellular nicotinamide adenine dinucleotide (phosphate) (NAD(P)H) level could be observed between a genetically modified Saccharomyces cerevisiae strain, engineered for NADPH dependent 5-hydroxymethyl-2-furaldehyde (HMF) reduction, and its control strain. Cells overexpressing the alcohol dehydrogenase 6 gene (ADH6 strain) and cells carrying the corresponding control plasmid (control strain) were each immobilized on Au-microelectrodes. The real-time dynamics of NAD(P)H availability in the two strains, preincubated with HMF, was probed using the menadione-ferricyanide double mediator system. A lower intracellular NADPH level as the consequence of more effective HMF reduction was observed for the ADH6 strain both with and without added glucose, which increases the overall cellular NADPH level. The mediated amperometric signal during real-time monitoring of the concentration dependent HMF reduction in living cells could be translated into the cellular enzyme kinetic parameters: K(M,cell)(app), V(MAX), k(cat,cell), and k(cat,cell)/K)M,cell)(app). The results indicated that the overexpression of the ADH6 gene gave a 68% decrease in K(M,cell)(app) and 42% increase in V(MAX), resulting in a 4-fold increase in k(cat,cell)/K(M,cell)(app). These results demonstrate that the mediated amperometric method is useful for monitoring the short-term dynamics of NAD(P)H variations and determining cellular enzyme kinetic parameters in S. cerevisiae cells.
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Affiliation(s)
- Natalie V Kostesha
- Department of Applied Microbiology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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Kostesha N, Heiskanen A, Spégel C, Hahn-Hägerdal B, Gorwa-Grauslund MF, Emnéus J. Real-time detection of cofactor availability in genetically modified living Saccharomyces cerevisiae cells — Simultaneous probing of different geno- and phenotypes. Bioelectrochemistry 2009; 76:180-8. [DOI: 10.1016/j.bioelechem.2009.02.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2008] [Revised: 02/23/2009] [Accepted: 02/27/2009] [Indexed: 10/21/2022]
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