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Askari MJ, Kallick JD, McCrory CCL. Selective Reduction of Aqueous Nitrate to Ammonium with an Electropolymerized Chromium Molecular Catalyst. J Am Chem Soc 2024; 146:7439-7455. [PMID: 38465608 DOI: 10.1021/jacs.3c12783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Nitrate (NO3-) is a common nitrogen-containing contaminant in agricultural, industrial, and low-level nuclear wastewater that causes significant environmental damage. In this work, we report a bioinspired Cr-based molecular catalyst incorporated into a redox polymer that selectively and efficiently reduces aqueous NO3- to ammonium (NH4+), a desirable value-added fertilizer component and industrial precursor, at rates of ∼0.36 mmol NH4+ mgcat-1 h-1 with >90% Faradaic efficiency for NH4+. The NO3- reduction reaction occurs through a cascade catalysis mechanism involving the stepwise reduction of NO3- to NH4+ via observed NO2- and NH2OH intermediates. To our knowledge, this is one of the first examples of a molecular catalyst, homogeneous or heterogenized, that is reported to reduce aqueous NO3- to NH4+ with rates and Faradaic efficiencies comparable to those of state-of-the-art solid-state electrocatalysts. This work highlights a promising and previously unexplored area of electrocatalyst research using polymer-catalyst composites containing complexes with oxophilic transition metal active sites for electrochemical nitrate remediation with nutrient recovery.
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Affiliation(s)
- Maiko J Askari
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jeremy D Kallick
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Charles C L McCrory
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, Michigan 48109, United States
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2
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Westrop JP, Yadav P, Nolan PJ, Campbell KM, Singh R, Bone SE, Chan AH, Kohtz AJ, Pan D, Healy O, Bargar JR, Snow DD, Weber KA. Nitrate-Stimulated Release of Naturally Occurring Sedimentary Uranium. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:4354-4366. [PMID: 36848522 DOI: 10.1021/acs.est.2c07683] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Groundwater uranium (U) concentrations have been measured above the U.S. EPA maximum contaminant level (30 μg/L) in many U.S. aquifers, including in areas not associated with anthropogenic contamination by milling or mining. In addition to carbonate, nitrate has been correlated to uranium groundwater concentrations in two major U.S. aquifers. However, to date, direct evidence that nitrate mobilizes naturally occurring U from aquifer sediments has not been presented. Here, we demonstrate that the influx of high-nitrate porewater through High Plains alluvial aquifer silt sediments bearing naturally occurring U(IV) can stimulate a nitrate-reducing microbial community capable of catalyzing the oxidation and mobilization of U into the porewater. Microbial reduction of nitrate yielded nitrite, a reactive intermediate, which was further demonstrated to abiotically mobilize U from the reduced alluvial aquifer sediments. These results indicate that microbial activity, specifically nitrate reduction to nitrite, is one mechanism driving U mobilization from aquifer sediments in addition to previously described bicarbonate-driven desorption from mineral surfaces, such as Fe(III) oxides.
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Affiliation(s)
- Jeffrey P Westrop
- Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Pooja Yadav
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - P J Nolan
- Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Kate M Campbell
- Geology, Geophysics, and Geochemistry Science Center, Denver Federal Center, U.S. Geological Survey, Denver, Colorado 80225, United States
| | - Rajesh Singh
- Environmental Hydrology Division, National Institute of Hydrology, Roorkee 247667, India
| | - Sharon E Bone
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Alicia H Chan
- Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Anthony J Kohtz
- Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Donald Pan
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Olivia Healy
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - John R Bargar
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Daniel D Snow
- School of Natural Resources and Nebraska Water Center, Part of the Daugherty Water for Food Global Institute, Water Sciences Laboratory, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Karrie A Weber
- Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- Daugherty Water for Food Global Institute, University of Nebraska, Lincoln, Nebraska 68588, United States
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3
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Liu Y, Zhang Y, Huang Y, Niu J, Huang J, Peng X, Peng F. Spatial and temporal conversion of nitrogen using Arthrobacter sp. 24S4-2, a strain obtained from Antarctica. Front Microbiol 2023; 14:1040201. [PMID: 36876078 PMCID: PMC9975570 DOI: 10.3389/fmicb.2023.1040201] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 01/30/2023] [Indexed: 02/17/2023] Open
Abstract
According to average nucleotide identity (ANI) analysis of the complete genomes, strain 24S4-2 isolated from Antarctica is considered as a potential novel Arthrobacter species. Arthrobacter sp. 24S4-2 could grow and produce ammonium in nitrate or nitrite or even nitrogen free medium. Strain 24S4-2 was discovered to accumulate nitrate/nitrite and subsequently convert nitrate to nitrite intracellularly when incubated in a nitrate/nitrite medium. In nitrogen-free medium, strain 24S4-2 not only reduced the accumulated nitrite for growth, but also secreted ammonia to the extracellular under aerobic condition, which was thought to be linked to nitrite reductase genes nirB, nirD, and nasA by the transcriptome and RT-qPCR analysis. A membrane-like vesicle structure was detected in the cell of strain 24S4-2 by transmission electron microscopy, which was thought to be the site of intracellular nitrogen supply accumulation and conversion. This spatial and temporal conversion process of nitrogen source helps the strain maintain development in the absence of nitrogen supply or a harsh environment, which is part of its adaption strategy to the Antarctic environment. This process may also play an important ecological role, that other bacteria in the environment would benefit from its extracellular nitrogen source secretion and nitrite consumption characteristics.
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Affiliation(s)
- Yixuan Liu
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Yumin Zhang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China
| | - Yudi Huang
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Jingjing Niu
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Jun Huang
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Xiaoya Peng
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
| | - Fang Peng
- China Center for Type Culture Collection (CCTCC), College of Life Sciences, Wuhan University, Wuhan, China
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4
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González PJ, Rivas MG, Ferroni FM, Rizzi AC, Brondino CD. Electron transfer pathways and spin–spin interactions in Mo- and Cu-containing oxidoreductases. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Abstract
Transmembrane proteins involved in metabolic redox reactions and photosynthesis catalyse a plethora of key energy-conversion processes and are thus of great interest for bioelectrocatalysis-based applications. The development of membrane protein modified electrodes has made it possible to efficiently exchange electrons between proteins and electrodes, allowing mechanistic studies and potentially applications in biofuels generation and energy conversion. Here, we summarise the most common electrode modification and their characterisation techniques for membrane proteins involved in biofuels conversion and semi-artificial photosynthesis. We discuss the challenges of applications of membrane protein modified electrodes for bioelectrocatalysis and comment on emerging methods and future directions, including recent advances in membrane protein reconstitution strategies and the development of microbial electrosynthesis and whole-cell semi-artificial photosynthesis.
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Li Y, Go YK, Ooka H, He D, Jin F, Kim SH, Nakamura R. Enzyme Mimetic Active Intermediates for Nitrate Reduction in Neutral Aqueous Media. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002647] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Yamei Li
- Biofunctional Catalyst Research TeamRIKEN Center for Sustainable Resource Science (CSRS) 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Earth-Life Science Institute (ELSI)Tokyo Institute of Technology 2-12-1-IE-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
| | - Yoo Kyung Go
- Western Seoul CenterKorea Basic Science Institute (KBSI) Seoul 03759 Korea
| | - Hideshi Ooka
- Biofunctional Catalyst Research TeamRIKEN Center for Sustainable Resource Science (CSRS) 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Daoping He
- Biofunctional Catalyst Research TeamRIKEN Center for Sustainable Resource Science (CSRS) 2-1 Hirosawa Wako Saitama 351-0198 Japan
- School of Environmental Science and EngineeringState Key Lab of Metal Matrix CompositesShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Fangming Jin
- School of Environmental Science and EngineeringState Key Lab of Metal Matrix CompositesShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Sun Hee Kim
- Western Seoul CenterKorea Basic Science Institute (KBSI) Seoul 03759 Korea
| | - Ryuhei Nakamura
- Biofunctional Catalyst Research TeamRIKEN Center for Sustainable Resource Science (CSRS) 2-1 Hirosawa Wako Saitama 351-0198 Japan
- Earth-Life Science Institute (ELSI)Tokyo Institute of Technology 2-12-1-IE-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
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7
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Enzyme Mimetic Active Intermediates for Nitrate Reduction in Neutral Aqueous Media. Angew Chem Int Ed Engl 2020; 59:9744-9750. [DOI: 10.1002/anie.202002647] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Indexed: 11/07/2022]
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8
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9
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Ma S, Ludwig R. Direct Electron Transfer of Enzymes Facilitated by Cytochromes. ChemElectroChem 2019; 6:958-975. [PMID: 31008015 PMCID: PMC6472588 DOI: 10.1002/celc.201801256] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/12/2018] [Indexed: 01/03/2023]
Abstract
The direct electron transfer (DET) of enzymes has been utilized to develop biosensors and enzymatic biofuel cells on micro- and nanostructured electrodes. Whereas some enzymes exhibit direct electron transfer between their active-site cofactor and an electrode, other oxidoreductases depend on acquired cytochrome domains or cytochrome subunits as built-in redox mediators. The physiological function of these cytochromes is to transfer electrons between the active-site cofactor and a redox partner protein. The exchange of the natural electron acceptor/donor by an electrode has been demonstrated for several cytochrome carrying oxidoreductases. These multi-cofactor enzymes have been applied in third generation biosensors to detect glucose, lactate, and other analytes. This review investigates and classifies oxidoreductases with a cytochrome domain, enzyme complexes with a cytochrome subunit, and covers designed cytochrome fusion enzymes. The structurally and electrochemically best characterized proponents from each enzyme class carrying a cytochrome, that is, flavoenzymes, quinoenzymes, molybdenum-cofactor enzymes, iron-sulfur cluster enzymes, and multi-haem enzymes, are featured, and their biochemical, kinetic, and electrochemical properties are compared. The cytochromes molecular and functional properties as well as their contribution to the interdomain electron transfer (IET, between active-site and cytochrome) and DET (between cytochrome and electrode) with regard to the achieved current density is discussed. Protein design strategies for cytochrome-fused enzymes are reviewed and the limiting factors as well as strategies to overcome them are outlined.
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Affiliation(s)
- Su Ma
- Biocatalysis and Biosensing Laboratory Department of Food Science and TechnologyBOKU – University of Natural Resources and Life SciencesMuthgasse 181190ViennaAustria
| | - Roland Ludwig
- Biocatalysis and Biosensing Laboratory Department of Food Science and TechnologyBOKU – University of Natural Resources and Life SciencesMuthgasse 181190ViennaAustria
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10
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Zhang K, Zhou H, Hu P, Lu Q. The direct electrochemistry and bioelectrocatalysis of nitrate reductase at a gold nanoparticles/aminated graphene sheets modified glassy carbon electrode. RSC Adv 2019; 9:37207-37213. [PMID: 35542297 PMCID: PMC9075544 DOI: 10.1039/c9ra07082f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 11/07/2019] [Indexed: 12/20/2022] Open
Abstract
The aminated graphene sheets could immobilize nitrate reductase stably and control its orientation through electrostatic attractions, achieving its direct electrochemistry.
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Affiliation(s)
- Ke Zhang
- Institute of Environmental Medicine
- State Key Laboratory of Environment Health (Incubation)
- Key Laboratory of Environment and Health
- Ministry of Education
- Key Laboratory of Environment and Health (Wuhan)
| | - Hao Zhou
- Institute of Environmental Medicine
- State Key Laboratory of Environment Health (Incubation)
- Key Laboratory of Environment and Health
- Ministry of Education
- Key Laboratory of Environment and Health (Wuhan)
| | - Ping Hu
- Institute of Environmental Medicine
- State Key Laboratory of Environment Health (Incubation)
- Key Laboratory of Environment and Health
- Ministry of Education
- Key Laboratory of Environment and Health (Wuhan)
| | - Qing Lu
- Institute of Environmental Medicine
- State Key Laboratory of Environment Health (Incubation)
- Key Laboratory of Environment and Health
- Ministry of Education
- Key Laboratory of Environment and Health (Wuhan)
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11
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Maiocco SJ, Walker LM, Elliott SJ. Determining Redox Potentials of the Iron-Sulfur Clusters of the AdoMet Radical Enzyme Superfamily. Methods Enzymol 2018; 606:319-339. [PMID: 30097097 DOI: 10.1016/bs.mie.2018.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
While protein film electrochemistry (PFE) has proven to be an effective tool in the interrogation of redox cofactors and assessing the electrocatalytic activity of many different enzymes, recently it has been proven to be useful for the study of the redox potentials of the cofactors of AdoMet radical enzymes (AREs). In this chapter, we review the challenges and opportunities of examining the redox cofactors of AREs in a high level of detail, particularly for the deconvolution of redox potentials of multiple cofactors. We comment on how to best assess the electroactive nature of any given ARE, and we see that when applied well, PFE allows for not only determining redox potentials, but also determining proton-coupling and ligand-binding phenomena in the ARE superfamily.
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Affiliation(s)
| | - Lindsey M Walker
- Department of Chemistry, Boston University, Boston, MA, United States
| | - Sean J Elliott
- Department of Chemistry, Boston University, Boston, MA, United States.
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12
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Zanello P. Structure and electrochemistry of proteins harboring iron-sulfur clusters of different nuclearities. Part II. [4Fe-4S] and [3Fe-4S] iron-sulfur proteins. J Struct Biol 2018; 202:250-263. [DOI: 10.1016/j.jsb.2018.01.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 01/11/2018] [Accepted: 01/29/2018] [Indexed: 01/27/2023]
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13
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Milton RD, Minteer SD. Direct enzymatic bioelectrocatalysis: differentiating between myth and reality. J R Soc Interface 2017; 14:20170253. [PMID: 28637918 PMCID: PMC5493807 DOI: 10.1098/rsif.2017.0253] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 05/30/2017] [Indexed: 02/03/2023] Open
Abstract
Enzymatic bioelectrocatalysis is being increasingly exploited to better understand oxidoreductase enzymes, to develop minimalistic yet specific biosensor platforms, and to develop alternative energy conversion devices and bioelectrosynthetic devices for the production of energy and/or important chemical commodities. In some cases, these enzymes are able to electronically communicate with an appropriately designed electrode surface without the requirement of an electron mediator to shuttle electrons between the enzyme and electrode. This phenomenon has been termed direct electron transfer or direct bioelectrocatalysis. While many thorough studies have extensively investigated this fascinating feat, it is sometimes difficult to differentiate desirable enzymatic bioelectrocatalysis from electrocatalysis deriving from inactivated enzyme that may have also released its catalytic cofactor. This article will review direct bioelectrocatalysis of several oxidoreductases, with an emphasis on experiments that provide support for direct bioelectrocatalysis versus denatured enzyme or dissociated cofactor. Finally, this review will conclude with a series of proposed control experiments that could be adopted to discern successful direct electronic communication of an enzyme from its denatured counterpart.
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Affiliation(s)
- Ross D Milton
- Department of Chemistry, University of Utah, 315 S 1400 E, Room 2020, Salt Lake City, UT 84112, USA
| | - Shelley D Minteer
- Department of Chemistry, University of Utah, 315 S 1400 E, Room 2020, Salt Lake City, UT 84112, USA
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14
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Reeve HA, Ash PA, Park H, Huang A, Posidias M, Tomlinson C, Lenz O, Vincent KA. Enzymes as modular catalysts for redox half-reactions in H2-powered chemical synthesis: from biology to technology. Biochem J 2017; 474:215-230. [PMID: 28062838 PMCID: PMC5298933 DOI: 10.1042/bcj20160513] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/11/2016] [Accepted: 11/15/2016] [Indexed: 11/17/2022]
Abstract
The present study considers the ways in which redox enzyme modules are coupled in living cells for linking reductive and oxidative half-reactions, and then reviews examples in which this concept can be exploited technologically in applications of coupled enzyme pairs. We discuss many examples in which enzymes are interfaced with electronically conductive particles to build up heterogeneous catalytic systems in an approach which could be termed synthetic biochemistry We focus on reactions involving the H+/H2 redox couple catalysed by NiFe hydrogenase moieties in conjunction with other biocatalysed reactions to assemble systems directed towards synthesis of specialised chemicals, chemical building blocks or bio-derived fuel molecules. We review our work in which this approach is applied in designing enzyme-modified particles for H2-driven recycling of the nicotinamide cofactor NADH to provide a clean cofactor source for applications of NADH-dependent enzymes in chemical synthesis, presenting a combination of published and new work on these systems. We also consider related photobiocatalytic approaches for light-driven production of chemicals or H2 as a fuel. We emphasise the techniques available for understanding detailed catalytic properties of the enzymes responsible for individual redox half-reactions, and the importance of a fundamental understanding of the enzyme characteristics in enabling effective applications of redox biocatalysis.
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Affiliation(s)
- Holly A Reeve
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Philip A Ash
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - HyunSeo Park
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Ailun Huang
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Michalis Posidias
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Chloe Tomlinson
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Oliver Lenz
- Department of Chemistry, Technische Universität Berlin, Berlin 10623, Germany
| | - Kylie A Vincent
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K.
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15
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Milton RD, Minteer SD. Enzymatic Bioelectrosynthetic Ammonia Production: Recent Electrochemistry of Nitrogenase, Nitrate Reductase, and Nitrite Reductase. Chempluschem 2016; 82:513-521. [PMID: 31961593 DOI: 10.1002/cplu.201600442] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 10/19/2016] [Indexed: 11/06/2022]
Abstract
As an essential component of amino acids and nucleic acids, nitrogen (N) is a key element of life. For atmospheric (dinitrogen, N2 ) and environmental (nitrate and nitrite, NO3 - and NO2 - ) sources of N to be utilized in amino acid synthesis in various forms of life, it must first be reduced to ammonia (NH3 ). The Haber-Bosch process, in which N2 is reduced to NH3 at elevated temperature and pressure, represents a major NH3 production process that has had a great impact on the agricultural crop industry. This Minireview discusses the recent electrochemistry of three key enzymes of the global biogeochemical N cycle (nitrogenase, nitrate reductase, and nitrite reductase), in view of moving toward the creation of alternative NH3 production biotechnologies.
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Affiliation(s)
- Ross D Milton
- Departments of Chemistry and Materials Science and Engineering, University of Utah, 315 S 1400 E, Room 2020, Salt Lake City, Utah, 84112, USA
| | - Shelley D Minteer
- Departments of Chemistry and Materials Science and Engineering, University of Utah, 315 S 1400 E, Room 2020, Salt Lake City, Utah, 84112, USA
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16
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Kalimuthu P, Ringel P, Kruse T, Bernhardt PV. Direct electrochemistry of nitrate reductase from the fungus Neurospora crassa. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1857:1506-1513. [DOI: 10.1016/j.bbabio.2016.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 04/01/2016] [Indexed: 01/08/2023]
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17
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Protein Electrochemistry: Questions and Answers. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2016; 158:1-41. [DOI: 10.1007/10_2015_5016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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18
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Abstract
Nitrate reduction to ammonia via nitrite occurs widely as an anabolic process through which bacteria, archaea, and plants can assimilate nitrate into cellular biomass. Escherichia coli and related enteric bacteria can couple the eight-electron reduction of nitrate to ammonium to growth by coupling the nitrate and nitrite reductases involved to energy-conserving respiratory electron transport systems. In global terms, the respiratory reduction of nitrate to ammonium dominates nitrate and nitrite reduction in many electron-rich environments such as anoxic marine sediments and sulfide-rich thermal vents, the human gastrointestinal tract, and the bodies of warm-blooded animals. This review reviews the regulation and enzymology of this process in E. coli and, where relevant detail is available, also in Salmonella and draws comparisons with and implications for the process in other bacteria where it is pertinent to do so. Fatty acids may be present in high levels in many of the natural environments of E. coli and Salmonella in which oxygen is limited but nitrate is available to support respiration. In E. coli, nitrate reduction in the periplasm involves the products of two seven-gene operons, napFDAGHBC, encoding the periplasmic nitrate reductase, and nrfABCDEFG, encoding the periplasmic nitrite reductase. No bacterium has yet been shown to couple a periplasmic nitrate reductase solely to the cytoplasmic nitrite reductase NirB. The cytoplasmic pathway for nitrate reduction to ammonia is restricted almost exclusively to a few groups of facultative anaerobic bacteria that encounter high concentrations of environmental nitrate.
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19
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Coelho C, Romão MJ. Structural and mechanistic insights on nitrate reductases. Protein Sci 2015; 24:1901-11. [PMID: 26362109 DOI: 10.1002/pro.2801] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 09/04/2015] [Indexed: 01/31/2023]
Abstract
Nitrate reductases (NR) belong to the DMSO reductase family of Mo-containing enzymes and perform key roles in the metabolism of the nitrogen cycle, reducing nitrate to nitrite. Due to variable cell location, structure and function, they have been divided into periplasmic (Nap), cytoplasmic, and membrane-bound (Nar) nitrate reductases. The first crystal structure obtained for a NR was that of the monomeric NapA from Desulfovibrio desulfuricans in 1999. Since then several new crystal structures were solved providing novel insights that led to the revision of the commonly accepted reaction mechanism for periplasmic nitrate reductases. The two crystal structures available for the NarGHI protein are from the same organism (Escherichia coli) and the combination with electrochemical and spectroscopic studies also lead to the proposal of a reaction mechanism for this group of enzymes. Here we present an overview on the current advances in structural and functional aspects of bacterial nitrate reductases, focusing on the mechanistic implications drawn from the crystallographic data.
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Affiliation(s)
- Catarina Coelho
- Departamento de Química, Faculdade de Ciências e Tecnologia, UCIBIO@REQUIMTE, Universidade Nova de Lisboa, Caparica, 2829-516, Portugal
| | - Maria João Romão
- Departamento de Química, Faculdade de Ciências e Tecnologia, UCIBIO@REQUIMTE, Universidade Nova de Lisboa, Caparica, 2829-516, Portugal
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20
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Wu SY, Rothery RA, Weiner JH. Pyranopterin Coordination Controls Molybdenum Electrochemistry in Escherichia coli Nitrate Reductase. J Biol Chem 2015; 290:25164-73. [PMID: 26297003 DOI: 10.1074/jbc.m115.665422] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Indexed: 11/06/2022] Open
Abstract
We test the hypothesis that pyranopterin (PPT) coordination plays a critical role in defining molybdenum active site redox chemistry and reactivity in the mononuclear molybdoenzymes. The molybdenum atom of Escherichia coli nitrate reductase A (NarGHI) is coordinated by two PPT-dithiolene chelates that are defined as proximal and distal based on their proximity to a [4Fe-4S] cluster known as FS0. We examined variants of two sets of residues involved in PPT coordination: (i) those interacting directly or indirectly with the pyran oxygen of the bicyclic distal PPT (NarG-Ser(719), NarG-His(1163), and NarG-His(1184)); and (ii) those involved in bridging the two PPTs and stabilizing the oxidation state of the proximal PPT (NarG-His(1092) and NarG-His(1098)). A S719A variant has essentially no effect on the overall Mo(VI/IV) reduction potential, whereas the H1163A and H1184A variants elicit large effects (ΔEm values of -88 and -36 mV, respectively). Ala variants of His(1092) and His(1098) also elicit large ΔEm values of -143 and -101 mV, respectively. An Arg variant of His(1092) elicits a small ΔEm of +18 mV on the Mo(VI/IV) reduction potential. There is a linear correlation between the molybdenum Em value and both enzyme activity and the ability to support anaerobic respiratory growth on nitrate. These data support a non-innocent role for the PPT moieties in controlling active site metal redox chemistry and catalysis.
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Affiliation(s)
- Sheng-Yi Wu
- From the Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Richard A Rothery
- From the Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Joel H Weiner
- From the Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
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Ceccaldi P, Rendon J, Léger C, Toci R, Guigliarelli B, Magalon A, Grimaldi S, Fourmond V. Reductive activation of E. coli respiratory nitrate reductase. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1847:1055-63. [PMID: 26073890 DOI: 10.1016/j.bbabio.2015.06.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/01/2015] [Accepted: 06/07/2015] [Indexed: 11/25/2022]
Abstract
Over the past decades, a number of authors have reported the presence of inactive species in as-prepared samples of members of the Mo/W-bisPGD enzyme family. This greatly complicated the spectroscopic studies of these enzymes, since it is impossible to discriminate between active and inactive species on the basis of the spectroscopic signatures alone. Escherichia coli nitrate reductase A (NarGHI) is a member of the Mo/W-bisPGD family that allows anaerobic respiration using nitrate as terminal electron acceptor. Here, using protein film voltammetry on NarGH films, we show that the enzyme is purified in a functionally heterogeneous form that contains between 20 and 40% of inactive species that activate the first time they are reduced. This activation proceeds in two steps: a non-redox reversible reaction followed by an irreversible reduction. By carefully correlating electrochemical and EPR spectroscopic data, we show that neither the two major Mo(V) signals nor those of the two FeS clusters that are the closest to the Mo center are associated with the two inactive species. We also conclusively exclude the possibility that the major "low-pH" and "high-pH" Mo(V) EPR signatures correspond to species in acid-base equilibrium.
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Affiliation(s)
- Pierre Ceccaldi
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - Julia Rendon
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - Christophe Léger
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - René Toci
- Aix-Marseille Université, CNRS, LCB UMR 7283, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - Bruno Guigliarelli
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - Axel Magalon
- Aix-Marseille Université, CNRS, LCB UMR 7283, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - Stéphane Grimaldi
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France
| | - Vincent Fourmond
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, F-13402 Marseille cedex 20, France.
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Duca M, Weeks JR, Fedor JG, Weiner JH, Vincent KA. Combining Noble Metals and Enzymes for Relay Cascade Electrocatalysis of Nitrate Reduction to Ammonia at Neutral pH. ChemElectroChem 2015. [DOI: 10.1002/celc.201500166] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Sparacino-Watkins C, Stolz JF, Basu P. Nitrate and periplasmic nitrate reductases. Chem Soc Rev 2014; 43:676-706. [PMID: 24141308 DOI: 10.1039/c3cs60249d] [Citation(s) in RCA: 186] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The nitrate anion is a simple, abundant and relatively stable species, yet plays a significant role in global cycling of nitrogen, global climate change, and human health. Although it has been known for quite some time that nitrate is an important species environmentally, recent studies have identified potential medical applications. In this respect the nitrate anion remains an enigmatic species that promises to offer exciting science in years to come. Many bacteria readily reduce nitrate to nitrite via nitrate reductases. Classified into three distinct types--periplasmic nitrate reductase (Nap), respiratory nitrate reductase (Nar) and assimilatory nitrate reductase (Nas), they are defined by their cellular location, operon organization and active site structure. Of these, Nap proteins are the focus of this review. Despite similarities in the catalytic and spectroscopic properties Nap from different Proteobacteria are phylogenetically distinct. This review has two major sections: in the first section, nitrate in the nitrogen cycle and human health, taxonomy of nitrate reductases, assimilatory and dissimilatory nitrate reduction, cellular locations of nitrate reductases, structural and redox chemistry are discussed. The second section focuses on the features of periplasmic nitrate reductase where the catalytic subunit of the Nap and its kinetic properties, auxiliary Nap proteins, operon structure and phylogenetic relationships are discussed.
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Affiliation(s)
- Russ Hille
- Department of Biochemistry, University of California, Riverside, Riverside, California 92521, United States
| | - James Hall
- Department of Biochemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Partha Basu
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
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Hexter SV, Esterle TF, Armstrong FA. A unified model for surface electrocatalysis based on observations with enzymes. Phys Chem Chem Phys 2014; 16:11822-33. [DOI: 10.1039/c3cp55230f] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Kalimuthu P, Fischer-Schrader K, Schwarz G, Bernhardt PV. Mediated Electrochemistry of Nitrate Reductase from Arabidopsis thaliana. J Phys Chem B 2013; 117:7569-77. [DOI: 10.1021/jp404076w] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Palraj Kalimuthu
- School of Chemistry and Molecular
Biosciences, University of Queensland,
Brisbane, 4072, Australia
| | - Katrin Fischer-Schrader
- Institute of Biochemistry, Department of Chemistry & Center for Molecular Medicine, Cologne University, Zülpicherstr. 47, 50674 Köln, Germany
| | - Günter Schwarz
- Institute of Biochemistry, Department of Chemistry & Center for Molecular Medicine, Cologne University, Zülpicherstr. 47, 50674 Köln, Germany
| | - Paul V. Bernhardt
- School of Chemistry and Molecular
Biosciences, University of Queensland,
Brisbane, 4072, Australia
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27
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Induced peroxidase activity of haem containing nitrate reductases revealed by protein film electrochemistry. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.01.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Eick M, Stöhr C. Denitrification by plant roots? New aspects of plant plasma membrane-bound nitrate reductase. PROTOPLASMA 2012; 249:909-918. [PMID: 22160216 DOI: 10.1007/s00709-011-0355-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 11/17/2011] [Indexed: 05/31/2023]
Abstract
A specific form of plasma membrane-bound nitrate reductase in plants is restricted to roots. Two peptides originated from plasma membrane integral proteins isolated from Hordeum vulgare have been assigned as homologues to the subunit NarH of respiratory nitrate reductase of Escherichia coli. Corresponding sequences have been detected for predicted proteins of Populus trichocarpa with high degree of identities for the subunits NarH (75%) and NarG (65%), however, with less accordance for the subunit NarI. These findings coincide with biochemical properties, particularly in regard to the electron donors menadione and succinate. Together with the root-specific and plasma membrane-bound nitrite/NO reductase, nitric oxide is produced under hypoxic conditions in the presence of nitrate. In this context, a possible function in nitrate respiration of plant roots and an involvement of plants in denitrification processes are discussed.
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Affiliation(s)
- Manuela Eick
- Institut für Botanik, Ernst-Moritz-Arndt-Universität, Grimmer Strasse 88, 17487, Greifswald, Germany
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Substrate-dependent modulation of the enzymatic catalytic activity: reduction of nitrate, chlorate and perchlorate by respiratory nitrate reductase from Marinobacter hydrocarbonoclasticus 617. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1072-82. [PMID: 22561116 DOI: 10.1016/j.bbabio.2012.04.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 03/23/2012] [Accepted: 04/17/2012] [Indexed: 10/28/2022]
Abstract
The respiratory nitrate reductase complex (NarGHI) from Marinobacter hydrocarbonoclasticus 617 (Mh, formerly Pseudomonas nautica 617) catalyzes the reduction of nitrate to nitrite. This reaction is the first step of the denitrification pathway and is coupled to the quinone pool oxidation and proton translocation to the periplasm, which generates the proton motive force needed for ATP synthesis. The Mh NarGH water-soluble heterodimer has been purified and the kinetic and redox properties have been studied through in-solution enzyme kinetics, protein film voltammetry and spectropotentiometric redox titration. The kinetic parameters of Mh NarGH toward substrates and inhibitors are consistent with those reported for other respiratory nitrate reductases. Protein film voltammetry showed that at least two catalytically distinct forms of the enzyme, which depend on the applied potential, are responsible for substrate reduction. These two forms are affected differentially by the oxidizing substrate, as well as by pH and inhibitors. A new model for the potential dependence of the catalytic efficiency of Nars is proposed.
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Abstract
The molybdenum cofactor is composed of a molybdenum coordinated by one or two rather complicated ligands known as either molybdopterin or pyranopterin. Pterin is one of a large family of bicyclic N-heterocycles called pteridines. Such molecules are widely found in Nature, having various forms to perform a variety of biological functions. This article describes the basic nomenclature of pterin, their biological roles, structure, chemical synthesis and redox reactivity. In addition, the biosynthesis of pterins and current models of the molybdenum cofactor are discussed.
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Affiliation(s)
- Partha Basu
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282, United States
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Abstract
Bacterial cellular metabolism is renowned for its metabolic diversity and adaptability. However, certain environments present particular challenges. Aerobic metabolism of highly reduced carbon substrates by soil bacteria such as Paracoccus pantotrophus presents one such challenge since it may result in excessive electron delivery to the respiratory redox chain when compared with the availability of terminal oxidant, O2. The level of a periplasmic ubiquinol-dependent nitrate reductase, NAP, is up-regulated in the presence of highly reduced carbon substrates. NAP oxidizes ubiquinol at the periplasmic face of the cytoplasmic membrane and reduces nitrate in the periplasm. Thus its activity counteracts the accumulation of excess reducing equivalents in ubiquinol, thereby maintaining the redox poise of the ubiquinone/ubiquinol pool without contributing to the protonmotive force across the cytoplasmic membrane. Although P. pantotrophus NapAB shows a high level of substrate specificity towards nitrate, the enzyme has also been reported to reduce selenate in spectrophotometric solution assays. This transaction draws on our current knowledge concerning the bacterial respiratory nitrate reductases and extends the application of PFE (protein film electrochemistry) to resolve and quantify the selenate reductase activity of NapAB.
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Bernhardt PV. Exploiting the versatility and selectivity of Mo enzymes with electrochemistry. Chem Commun (Camb) 2011; 47:1663-73. [DOI: 10.1039/c0cc03681a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rapson TD, Kappler U, Hanson GR, Bernhardt PV. Short circuiting a sulfite oxidising enzyme with direct electrochemistry: Active site substitutions and their effect on catalysis and electron transfer. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1807:108-18. [DOI: 10.1016/j.bbabio.2010.09.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 09/06/2010] [Accepted: 09/15/2010] [Indexed: 10/19/2022]
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Fourmond V, Burlat B, Dementin S, Sabaty M, Arnoux P, Étienne É, Guigliarelli B, Bertrand P, Pignol D, Léger C. Dependence of Catalytic Activity on Driving Force in Solution Assays and Protein Film Voltammetry: Insights from the Comparison of Nitrate Reductase Mutants. Biochemistry 2010; 49:2424-32. [DOI: 10.1021/bi902140e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vincent Fourmond
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Bénédicte Burlat
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Sébastien Dementin
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Monique Sabaty
- Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, 13108 Saint-Paul-lez-Durance, France, and Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, and Aix-Marseille Université, 13108 Saint-Paul-lez-Durance, France
| | - Pascal Arnoux
- Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, 13108 Saint-Paul-lez-Durance, France, and Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, and Aix-Marseille Université, 13108 Saint-Paul-lez-Durance, France
| | - Émilien Étienne
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Bruno Guigliarelli
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Patrick Bertrand
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - David Pignol
- Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, 13108 Saint-Paul-lez-Durance, France, and Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, and Aix-Marseille Université, 13108 Saint-Paul-lez-Durance, France
| | - Christophe Léger
- Centre National de la Recherche Scientifique, UPR 9036, Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, and Aix-Marseille Université, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
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Fourmond V, Sabaty M, Arnoux P, Bertrand P, Pignol D, Léger C. Reassessing the Strategies for Trapping Catalytic Intermediates during Nitrate Reductase Turnover. J Phys Chem B 2010; 114:3341-7. [DOI: 10.1021/jp911443y] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Vincent Fourmond
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Centre National de la Recherche Scientifique, UPR 9036, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, F-13108 Saint-Paul-lez-Durance, France, Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, 13108 Saint-Paul-lez-Durance, France, and Aix-Marseille
| | - Monique Sabaty
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Centre National de la Recherche Scientifique, UPR 9036, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, F-13108 Saint-Paul-lez-Durance, France, Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, 13108 Saint-Paul-lez-Durance, France, and Aix-Marseille
| | - Pascal Arnoux
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Centre National de la Recherche Scientifique, UPR 9036, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, F-13108 Saint-Paul-lez-Durance, France, Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, 13108 Saint-Paul-lez-Durance, France, and Aix-Marseille
| | - Patrick Bertrand
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Centre National de la Recherche Scientifique, UPR 9036, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, F-13108 Saint-Paul-lez-Durance, France, Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, 13108 Saint-Paul-lez-Durance, France, and Aix-Marseille
| | - David Pignol
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Centre National de la Recherche Scientifique, UPR 9036, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, F-13108 Saint-Paul-lez-Durance, France, Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, 13108 Saint-Paul-lez-Durance, France, and Aix-Marseille
| | - Christophe Léger
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Centre National de la Recherche Scientifique, UPR 9036, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Laboratoire de Bioénergétique Cellulaire, Commissariat à l’Energie Atomique, DSV, IBEB, F-13108 Saint-Paul-lez-Durance, France, Centre National de la Recherche Scientifique, UMR 6191, Biologie Végétale et Microbiologie Environnementale, 13108 Saint-Paul-lez-Durance, France, and Aix-Marseille
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Affiliation(s)
- Victor Rosca
- Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands
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Abstract
Quinone oxidoreductases are a class of membrane enzymes that catalyse the oxidation or reduction of membrane-bound quinols/quinones. The conversion of quinone/quinol by these enzymes is difficult to study because of the hydrophobic nature of the enzymes and their substrates. We describe some biochemical properties of quinones and quinone oxidoreductases and then look in more detail at two model membranes that can be used to study quinone oxidoreductases in a native-like membrane environment with their native lipophilic quinone substrates. The results obtained with these model membranes are compared with classical enzyme assays that use water-soluble quinone analogues.
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Affiliation(s)
- Sophie A. Weiss
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
| | - Lars J. C. Jeuken
- Centre for Self Organising Molecular Systems, University of Leeds, Leeds, LS2 9JT, UK
- Institute of Membrane and Systems Biology, University of Leeds, Leeds, LS2 9JT, UK
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ZHANG HN, GUO ZY, GAI PP. Research Progress in Protein Film Voltammetry. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2009. [DOI: 10.1016/s1872-2040(08)60093-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Majumdar A, Pal K, Sarkar S. Necessity of fine tuning in Mo(iv) bis(dithiolene) complexes to warrant nitrate reduction. Dalton Trans 2009:1927-38. [DOI: 10.1039/b815436h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chen KI, McEwan AG, Bernhardt PV. Mediated electrochemistry of dimethyl sulfoxide reductase from Rhodobacter capsulatus. J Biol Inorg Chem 2008; 14:409-19. [DOI: 10.1007/s00775-008-0458-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Accepted: 11/26/2008] [Indexed: 11/29/2022]
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Microbial biofilm voltammetry: direct electrochemical characterization of catalytic electrode-attached biofilms. Appl Environ Microbiol 2008; 74:7329-37. [PMID: 18849456 DOI: 10.1128/aem.00177-08] [Citation(s) in RCA: 260] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
While electrochemical characterization of enzymes immobilized on electrodes has become common, there is still a need for reliable quantitative methods for study of electron transfer between living cells and conductive surfaces. This work describes growth of thin (<20 microm) Geobacter sulfurreducens biofilms on polished glassy carbon electrodes, using stirred three-electrode anaerobic bioreactors controlled by potentiostats and nondestructive voltammetry techniques for characterization of viable biofilms. Routine in vivo analysis of electron transfer between bacterial cells and electrodes was performed, providing insight into the main redox-active species participating in electron transfer to electrodes. At low scan rates, cyclic voltammetry revealed catalytic electron transfer between cells and the electrode, similar to what has been observed for pure enzymes attached to electrodes under continuous turnover conditions. Differential pulse voltammetry and electrochemical impedance spectroscopy also revealed features that were consistent with electron transfer being mediated by an adsorbed catalyst. Multiple redox-active species were detected, revealing complexity at the outer surfaces of this bacterium. These techniques provide the basis for cataloging quantifiable, defined electron transfer phenotypes as a function of potential, electrode material, growth phase, and culture conditions and provide a framework for comparisons with other species or communities.
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Direct catalytic electrochemistry of sulfite dehydrogenase: Mechanistic insights and contrasts with related Mo enzymes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2008; 1777:1319-25. [DOI: 10.1016/j.bbabio.2008.06.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 06/06/2008] [Accepted: 06/06/2008] [Indexed: 11/21/2022]
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Léger C, Bertrand P. Direct Electrochemistry of Redox Enzymes as a Tool for Mechanistic Studies. Chem Rev 2008; 108:2379-438. [DOI: 10.1021/cr0680742] [Citation(s) in RCA: 594] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Srikanth S, Marsili E, Flickinger MC, Bond DR. Electrochemical characterization of Geobacter sulfurreducens cells immobilized on graphite paper electrodes. Biotechnol Bioeng 2008; 99:1065-73. [PMID: 17929324 DOI: 10.1002/bit.21671] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bacteria able to transfer electrons to conductive surfaces are of interest as catalysts in microbial fuel cells, as well as in bioprocessing, bioremediation, and corrosion. New procedures for immobilization of Geobacter sulfurreducens on graphite electrodes are described that allow routine, repeatable electrochemical analysis of cell-electrode interactions. Immediately after immobilizing G. sulfurreducens on electrodes, electrical current was obtained without addition of exogenous electron shuttles or electroactive polymers. Voltammetry and impedance analysis of pectin-immobilized bacteria transferring electrons to electrode surfaces could also be performed. Cyclic voltammetry of immobilized cells revealed voltage-dependent catalytic current similar to what is commonly observed with adsorbed enzymes, with catalytic waves centered at -0.15 V (vs. SHE). Electrodes maintained at +0.25 V (vs. SHE) initially produced 0.52 A/m(2) in the presence of acetate as the electron donor. Electrical Impedance Spectroscopy of coatings was also consistent with a catalytic mechanism, controlled by charge transfer rate. When electrodes were maintained at an oxidizing potential for 24 h, electron transfer to electrodes increased to 1.75 A/m(2). These observations of electron transfer by pectin-entrapped G. sulfurreducens appear to reflect native mechanisms used for respiration. The ability of washed G. sulfurreducens cells to immediately produce electrical current was consistent with the external surface of this bacterium possessing a pathway linking oxidative metabolism to extracellular electron transfer. This electrochemical activity of pectin-immobilized bacteria illustrates a strategy for preparation of catalytic electrodes and study of Geobacter under defined conditions.
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Affiliation(s)
- Shweta Srikanth
- Department of Microbiology, BioTechnology Institute, University of Minnesota, 140 Gortner, 1479 Gortner Ave, St. Paul, Minnesota 55108, USA
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Gates AJ, Richardson DJ, Butt JN. Voltammetric characterization of the aerobic energy-dissipating nitrate reductase of Paracoccus pantotrophus: exploring the activity of a redox-balancing enzyme as a function of electrochemical potential. Biochem J 2008; 409:159-68. [PMID: 17900239 DOI: 10.1042/bj20071088] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Paracoccus pantotrophus expresses two nitrate reductases associated with respiratory electron transport, termed NapABC and NarGHI. Both enzymes derive electrons from ubiquinol to reduce nitrate to nitrite. However, while NarGHI harnesses the energy of the quinol/nitrate couple to generate a transmembrane proton gradient, NapABC dissipates the energy associated with these reducing equivalents. In the present paper we explore the nitrate reductase activity of purified NapAB as a function of electrochemical potential, substrate concentration and pH using protein film voltammetry. Nitrate reduction by NapAB is shown to occur at potentials below approx. 0.1 V at pH 7. These are lower potentials than required for NarGH nitrate reduction. The potentials required for Nap nitrate reduction are also likely to require ubiquinol/ubiquinone ratios higher than are needed to activate the H(+)-pumping oxidases expressed during aerobic growth where Nap levels are maximal. Thus the operational potentials of P. pantotrophus NapAB are consistent with a productive role in redox balancing. A Michaelis constant (K(M)) of approx. 45 muM was determined for NapAB nitrate reduction at pH 7. This is in line with studies on intact cells where nitrate reduction by Nap was described by a Monod constant (K(S)) of less than 15 muM. The voltammetric studies also disclosed maximal NapAB activity in a narrow window of potential. This behaviour is resistant to change of pH, nitrate concentration and inhibitor concentration and its possible mechanistic origins are discussed.
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Affiliation(s)
- Andrew J Gates
- Centre for Metalloprotein Spectroscopy and Biology, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
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Vincent KA, Li X, Blanford CF, Belsey NA, Weiner JH, Armstrong FA. Enzymatic catalysis on conducting graphite particles. Nat Chem Biol 2007; 3:761-2. [DOI: 10.1038/nchembio.2007.47] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2007] [Accepted: 09/14/2007] [Indexed: 11/10/2022]
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Neupane KP, Gearty K, Francis A, Shearer J. Probing Variable Axial Ligation in Nickel Superoxide Dismutase Utilizing Metallopeptide-Based Models: Insight into the Superoxide Disproportionation Mechanism. J Am Chem Soc 2007; 129:14605-18. [PMID: 17985883 DOI: 10.1021/ja0731625] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kosh P. Neupane
- Contribution from the Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557
| | - Kristie Gearty
- Contribution from the Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557
| | - Ashish Francis
- Contribution from the Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557
| | - Jason Shearer
- Contribution from the Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557
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Bertrand P, Frangioni B, Dementin S, Sabaty M, Arnoux P, Guigliarelli B, Pignol D, Léger C. Effects of Slow Substrate Binding and Release in Redox Enzymes: Theory and Application to Periplasmic Nitrate Reductase. J Phys Chem B 2007; 111:10300-11. [PMID: 17676894 DOI: 10.1021/jp074340j] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
For redox enzymes, the technique called protein film voltammetry makes it possible to determine the entire profile of activity against driving force by having the enzyme exchanging directly electrons with the rotating-disc electrode onto which it is adsorbed. Both the potential location of the catalytic response and its detailed shape report on the sequence of catalytic events, electron transfers and chemical steps, but the models that have been used so far to decipher this signal lack generality. For example, it was often proposed that substrate binding to multiple redox states of the active site may explain that turnover is greater in a certain window of electrode potential, but no fully analytical treatment has been given. Here, we derive (i) the general current equation for the case of reversible substrate binding to any redox states of a two-electron active site (as exemplified by flavins and Mo cofactors), (ii) the quantitative conditions for an extremum in activity to occur, and (iii) the expressions from which the substrate-concentration dependence of the catalytic potential can be interpreted to learn about the kinetics of substrate binding and how this affects the reduction potential of the active site. Not only does slow substrate binding and release make the catalytic wave shape highly complex, but we also show that it can have important consequences which will escape detection in traditional experiments: the position of the wave (this is the driving force that is required to elicit catalysis) departs from the reduction potential of the active site even at the lowest substrate concentration, and this deviation may be large if substrate binding is irreversible. This occurs in the reductive half-cycle of periplasmic nitrate reductase where irreversibility lowers the driving force required to reduce the active site under turnover conditions and favors intramolecular electron transfer from the proximal [4Fe4S]+ cluster to the active site Mo(V).
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Affiliation(s)
- Patrick Bertrand
- Laboratoire de Bioénergétique et Ingénierie des Protéines, CNRS UPR 9036, IBSM, France
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de Groot MT, Merkx M, Koper MTM. Evidence for heme release in layer-by-layer assemblies of myoglobin and polystyrenesulfonate on pyrolitic graphite. J Biol Inorg Chem 2007; 12:761-6. [PMID: 17410384 DOI: 10.1007/s00775-007-0228-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Accepted: 03/12/2007] [Indexed: 11/24/2022]
Abstract
Layer-by-layer assemblies of myoglobin and polystyrenesulfonate (PSS) on pyrolitic graphite have been investigated with the goal of determining the origin of the voltammetric response of these films. From the similar midpoint potential, coverage and electron transfer behavior compared with those of adsorbed free heme, it was concluded that the observed voltammetric peak is due to heme adsorbed at the electrode surface. This suggests that the interactions between the pyrolitic graphite electrode, PSS and myoglobin can result in heme release from the protein followed by heme adsorption on the electrode.
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Affiliation(s)
- Matheus T de Groot
- Laboratory of Inorganic Chemistry and Catalysis, Schuit Institute of Catalysis, 5600 MB Eindhoven, The Netherlands.
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