1
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Valetti F, Morra S, Barbieri L, Dezzani S, Ratto A, Catucci G, Sadeghi SJ, Gilardi G. Oxygen-resistant [FeFe]hydrogenases: new biocatalysis tools for clean energy and cascade reactions. Faraday Discuss 2024. [PMID: 38836410 DOI: 10.1039/d4fd00010b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
The use of enzymes to generate hydrogen, instead of using rare metal catalysts, is an exciting area of study in modern biochemistry and biotechnology, as well as biocatalysis driven by sustainable hydrogen. Thus far, the oxygen sensitivity of the fastest hydrogen-producing/exploiting enzymes, [FeFe]hydrogenases, has hindered their practical application, thereby restricting innovations mainly to their [NiFe]-based, albeit slower, counterparts. Recent exploration of the biodiversity of clostridial hydrogen-producing enzymes has yielded the isolation of representatives from a relatively understudied group. These enzymes possess an inherent defense mechanism against oxygen-induced damage. This discovery unveils fresh opportunities for applications such as electrode interfacing, biofuel cells, immobilization, and entrapment for enhanced stability in practical uses. Furthermore, it suggests potential combinations with cascade reactions for CO2 conversion or cofactor regeneration, like NADPH, facilitating product separation in biotechnological processes. This work provides an overview of this new class of biocatalysts, incorporating unpublished protein engineering strategies to further investigate the dynamic mechanism of oxygen protection and to address crucial details remaining elusive such as still unidentified switching hot-spots and their effects. Variants with improved kcat as well as chimeric versions with promising features to attain gain-of-function variants and applications in various biotechnological processes are also presented.
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Affiliation(s)
- Francesca Valetti
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
| | - Simone Morra
- Faculty of Engineering, University of Nottingham, Nottingham, UK
| | - Lisa Barbieri
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
- University School for Advanced Studies IUSS Pavia, Italy
| | - Sabrina Dezzani
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
- University School for Advanced Studies IUSS Pavia, Italy
| | - Alessandro Ratto
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
| | - Gianluca Catucci
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
| | - Sheila J Sadeghi
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
| | - Gianfranco Gilardi
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy.
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2
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Sidabras JW, Stripp ST. A personal account on 25 years of scientific literature on [FeFe]-hydrogenase. J Biol Inorg Chem 2023; 28:355-378. [PMID: 36856864 DOI: 10.1007/s00775-023-01992-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 01/25/2023] [Indexed: 03/02/2023]
Abstract
[FeFe]-hydrogenases are gas-processing metalloenzymes that catalyze H2 oxidation and proton reduction (H2 release) in microorganisms. Their high turnover frequencies and lack of electrical overpotential in the hydrogen conversion reaction has inspired generations of biologists, chemists, and physicists to explore the inner workings of [FeFe]-hydrogenase. Here, we revisit 25 years of scientific literature on [FeFe]-hydrogenase and propose a personal account on 'must-read' research papers and review article that will allow interested scientists to follow the recent discussions on catalytic mechanism, O2 sensitivity, and the in vivo synthesis of the active site cofactor with its biologically uncommon ligands carbon monoxide and cyanide. Focused on-but not restricted to-structural biology and molecular biophysics, we highlight future directions that may inspire young investigators to pursue a career in the exciting and competitive field of [FeFe]-hydrogenase research.
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Affiliation(s)
- Jason W Sidabras
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI, USA, 53226.
| | - Sven T Stripp
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany.
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3
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Karishma S, Saravanan A, Senthil Kumar P, Rangasamy G. Sustainable production of biohydrogen from algae biomass: Critical review on pretreatment methods, mechanism and challenges. BIORESOURCE TECHNOLOGY 2022; 366:128187. [PMID: 36309177 DOI: 10.1016/j.biortech.2022.128187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
The production of chemicals and energy from sustainable biomass with an important objective decreasing carbon impressions has recently become one of the key areas of attention. Algae biomass have been recognized and researched as a potential renewable biomass of biohydrogen production attributed to their limited multiplying time, fast growing qualities and ability of lipid accumulation. This review additionally envelops various key perspectives such as composition and properties of algae biomass and pretreatment strategies such as physical, chemical and biological methods adopted for the algae biomass. This review is mainly focused on pretreatment strategies which have been developed to enhance biohydrogen production. The present review deals with methods and mechanism, enzymes involved and factors influencing on biohydrogen production which help to grasp various bottlenecks, challenges and constraints. Finally, the significant progressions and economical perspective on improving biohydrogen yield because of the expansion of co-substrates and the current trends are examined.
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Affiliation(s)
- S Karishma
- Department of Sustainable Engineering, Institute of Biotechnology, Saveetha School of Engineering, SIMATS, Chennai 602105, India
| | - A Saravanan
- Department of Sustainable Engineering, Institute of Biotechnology, Saveetha School of Engineering, SIMATS, Chennai 602105, India
| | - P Senthil Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam 603110, Tamil Nadu, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam 603110, Tamil Nadu, India; School of Engineering, Lebanese American University, Byblos, Lebanon.
| | - Gayathri Rangasamy
- University Centre for Research and Development & Department of Civil Engineering, Chandigarh University, Gharuan, Mohali, Punjab 140413, India
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4
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Kisgeropoulos EC, Bharadwaj VS, Mulder DW, King PW. The Contribution of Proton-Donor pKa on Reactivity Profiles of [FeFe]-hydrogenases. Front Microbiol 2022; 13:903951. [PMID: 36246213 PMCID: PMC9563086 DOI: 10.3389/fmicb.2022.903951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 06/17/2022] [Indexed: 11/24/2022] Open
Abstract
The [FeFe]-hydrogenases are enzymes that catalyze the reversible activation of H2 coupled to the reduction-oxidation of electron carriers. Members of the different taxonomic groups of [FeFe]-hydrogenases display a wide range of preference, or bias, for H2 oxidation or H2 production reactions, despite sharing a common catalytic cofactor, or H-cluster. Identifying the properties that control reactivity remains an active area of investigation, and models have emerged that include diversity in the catalytic site coordination environments and compositions of electron transfer chains. The kinetics of proton-coupled electron transfer at the H-cluster might be expected to be a point of control of reactivity. To test this hypothesis, systematic changes were made to the conserved cysteine residue that functions in proton exchange with the H-cluster in the three model enzymes: CaI, CpII, and CrHydA1. CaI and CpII both employ electron transfer accessory clusters but differ in bias, whereas CrHydA1 lacks accessory clusters having only the H-cluster. Changing from cysteine to either serine (more basic) or aspartate (more acidic) modifies the sidechain pKa and thus the barrier for the proton exchange step. The reaction rates for H2 oxidation or H2 evolution were surveyed and measured for model [FeFe]-hydrogenases, and the results show that the initial proton-transfer step in [FeFe]-hydrogenase is tightly coupled to the control of reactivity; a change from cysteine to more basic serine favored H2 oxidation in all enzymes, whereas a change to more acidic aspartate caused a shift in preference toward H2 evolution. Overall, the changes in reactivity profiles were profound, spanning 105 in ratio of the H2 oxidation-to-H2 evolution rates. The fact that the change in reactivity follows a common trend implies that the effect of changing the proton-transfer residue pKa may also be framed as an effect on the scaling relationship between the H-cluster di(thiolmethyl)amine (DTMA) ligand pKa and E m values of the H-cluster. Experimental observations that support this relationship, and how it relates to catalytic function in [FeFe]-hydrogenases, are discussed.
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Affiliation(s)
| | | | | | - Paul W. King
- National Renewable Energy Lab, Biosciences Center, Golden, CO, United States
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5
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Senger M, Kernmayr T, Lorenzi M, Redman HJ, Berggren G. Hydride state accumulation in native [FeFe]-hydrogenase with the physiological reductant H2 supports its catalytic relevance. Chem Commun (Camb) 2022; 58:7184-7187. [PMID: 35670542 PMCID: PMC9219605 DOI: 10.1039/d2cc00671e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Small molecules in solution may interfere with mechanistic investigations, as they can affect the stability of catalytic states and produce off-cycle states that can be mistaken for catalytically relevant species. Here we show that the hydride state (Hhyd), a proposed central intermediate in the catalytic cycle of [FeFe]-hydrogenase, can be formed in wild-type [FeFe]-hydrogenases treated with H2 in absence of other, non-biological, reductants. Moreover, we reveal a new state with unclear role in catalysis induced by common low pH buffers. Studies of enzymatic catalysis often rely on non-biological reagents, which may affect catalytic intermediates and produce off-cycle states. Here the influence of buffer and reductant on key intermediates of [FeFe]-hydrogenase are explored.![]()
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Affiliation(s)
- Moritz Senger
- Department of Chemistry, Physical Chemistry, Uppsala University, 75120 Uppsala, Sweden.
| | - Tobias Kernmayr
- Department of Chemistry, Molecular Biomimetics, Uppsala University, 75120 Uppsala, Sweden.
| | - Marco Lorenzi
- Department of Chemistry, Molecular Biomimetics, Uppsala University, 75120 Uppsala, Sweden.
| | - Holly J Redman
- Department of Chemistry, Molecular Biomimetics, Uppsala University, 75120 Uppsala, Sweden.
| | - Gustav Berggren
- Department of Chemistry, Molecular Biomimetics, Uppsala University, 75120 Uppsala, Sweden.
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6
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Catalytic systems mimicking the [FeFe]-hydrogenase active site for visible-light-driven hydrogen production. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214172] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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7
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Shepard EM, Impano S, Duffus BR, Pagnier A, Duschene KS, Betz JN, Byer AS, Galambas A, McDaniel EC, Watts H, McGlynn SE, Peters JW, Broderick WE, Broderick JB. HydG, the "dangler" iron, and catalytic production of free CO and CN -: implications for [FeFe]-hydrogenase maturation. Dalton Trans 2021; 50:10405-10422. [PMID: 34240096 PMCID: PMC9154046 DOI: 10.1039/d1dt01359a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The organometallic H-cluster of the [FeFe]-hydrogenase consists of a [4Fe-4S] cubane bridged via a cysteinyl thiolate to a 2Fe subcluster ([2Fe]H) containing CO, CN-, and dithiomethylamine (DTMA) ligands. The H-cluster is synthesized by three dedicated maturation proteins: the radical SAM enzymes HydE and HydG synthesize the non-protein ligands, while the GTPase HydF serves as a scaffold for assembly of [2Fe]H prior to its delivery to the [FeFe]-hydrogenase containing the [4Fe-4S] cubane. HydG uses l-tyrosine as a substrate, cleaving it to produce p-cresol as well as the CO and CN- ligands to the H-cluster, although there is some question as to whether these are formed as free diatomics or as part of a [Fe(CO)2(CN)] synthon. Here we show that Clostridium acetobutylicum (C.a.) HydG catalyzes formation of multiple equivalents of free CO at rates comparable to those for CN- formation. Free CN- is also formed in excess molar equivalents over protein. A g = 8.9 EPR signal is observed for C.a. HydG reconstituted to load the 5th "dangler" iron of the auxiliary [4Fe-4S][FeCys] cluster and is assigned to this "dangler-loaded" cluster state. Free CO and CN- formation and the degree of activation of [FeFe]-hydrogenase all occur regardless of dangler loading, but are increased 10-35% in the dangler-loaded HydG; this indicates the dangler iron is not essential to this process but may affect relevant catalysis. During HydG turnover in the presence of myoglobin, the g = 8.9 signal remains unchanged, indicating that a [Fe(CO)2(CN)(Cys)] synthon is not formed at the dangler iron. Mutation of the only protein ligand to the dangler iron, H272, to alanine nearly completely abolishes both free CO formation and hydrogenase activation, however results show this is not due solely to the loss of the dangler iron. In experiments with wild type and H272A HydG, and with different degrees of dangler loading, we observe a consistent correlation between free CO/CN- formation and hydrogenase activation. Taken in full, our results point to free CO/CN-, but not an [Fe(CO)2(CN)(Cys)] synthon, as essential species in hydrogenase maturation.
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Affiliation(s)
- Eric M Shepard
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Stella Impano
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Benjamin R Duffus
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Adrien Pagnier
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Kaitlin S Duschene
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Jeremiah N Betz
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Amanda S Byer
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Amanda Galambas
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Elizabeth C McDaniel
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Hope Watts
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Shawn E McGlynn
- Earth-Life Science Institute, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - John W Peters
- Institute of Biological Chemistry, Washington State University, Pullman, WA 99163, USA
| | - William E Broderick
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
| | - Joan B Broderick
- Department of Chemistry & Biochemistry, Montana State University, Bozeman, MT 59717, USA.
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8
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Ghosh AC, Duboc C, Gennari M. Synergy between metals for small molecule activation: Enzymes and bio-inspired complexes. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213606] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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9
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Kleinhaus JT, Wittkamp F, Yadav S, Siegmund D, Apfel UP. [FeFe]-Hydrogenases: maturation and reactivity of enzymatic systems and overview of biomimetic models. Chem Soc Rev 2021; 50:1668-1784. [DOI: 10.1039/d0cs01089h] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
[FeFe]-hydrogenases recieved increasing interest in the last decades. This review summarises important findings regarding their enzymatic reactivity as well as inorganic models applied as electro- and photochemical catalysts.
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Affiliation(s)
| | | | - Shanika Yadav
- Inorganic Chemistry I
- Ruhr University Bochum
- 44801 Bochum
- Germany
| | - Daniel Siegmund
- Department of Electrosynthesis
- Fraunhofer UMSICHT
- 46047 Oberhausen
- Germany
| | - Ulf-Peter Apfel
- Inorganic Chemistry I
- Ruhr University Bochum
- 44801 Bochum
- Germany
- Department of Electrosynthesis
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10
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Land H, Senger M, Berggren G, Stripp ST. Current State of [FeFe]-Hydrogenase Research: Biodiversity and Spectroscopic Investigations. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01614] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Henrik Land
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala 75120, Sweden
| | - Moritz Senger
- Physical Chemistry, Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala 75120, Sweden
- Bioinorganic Spectroscopy, Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Gustav Berggren
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala 75120, Sweden
| | - Sven T. Stripp
- Bioinorganic Spectroscopy, Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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11
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Mészáros LS, Ceccaldi P, Lorenzi M, Redman HJ, Pfitzner E, Heberle J, Senger M, Stripp ST, Berggren G. Spectroscopic investigations under whole-cell conditions provide new insight into the metal hydride chemistry of [FeFe]-hydrogenase. Chem Sci 2020; 11:4608-4617. [PMID: 34122916 PMCID: PMC8159234 DOI: 10.1039/d0sc00512f] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Hydrogenases are among the fastest H2 evolving catalysts known to date and have been extensively studied under in vitro conditions. Here, we report the first mechanistic investigation of an [FeFe]-hydrogenase under whole-cell conditions. Functional [FeFe]-hydrogenase from the green alga Chlamydomonas reinhardtii is generated in genetically modified Escherichia coli cells by addition of a synthetic cofactor to the growth medium. The assembly and reactivity of the resulting semi-synthetic enzyme was monitored using whole-cell electron paramagnetic resonance and Fourier-transform Infrared difference spectroscopy as well as scattering scanning near-field optical microscopy. Through a combination of gas treatments, pH titrations, and isotope editing we were able to corroborate the formation of a number of proposed catalytic intermediates in living cells, supporting their physiological relevance. Moreover, a previously incompletely characterized catalytic intermediate is reported herein, attributed to the formation of a protonated metal hydride species.
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Affiliation(s)
- Lívia S Mészáros
- Molecular Biomimetics, Dept. of Chemistry - Ångström Laboratory, Uppsala University Lägerhyddsvägen 1 SE-75120 Uppsala Sweden
| | - Pierre Ceccaldi
- Molecular Biomimetics, Dept. of Chemistry - Ångström Laboratory, Uppsala University Lägerhyddsvägen 1 SE-75120 Uppsala Sweden
| | - Marco Lorenzi
- Molecular Biomimetics, Dept. of Chemistry - Ångström Laboratory, Uppsala University Lägerhyddsvägen 1 SE-75120 Uppsala Sweden
| | - Holly J Redman
- Molecular Biomimetics, Dept. of Chemistry - Ångström Laboratory, Uppsala University Lägerhyddsvägen 1 SE-75120 Uppsala Sweden
| | - Emanuel Pfitzner
- Institute of Experimental Physics, Experimental Molecular Biophysics, Freie Universität Berlin Arnimallee 14 Berlin DE-14195 Germany
| | - Joachim Heberle
- Institute of Experimental Physics, Experimental Molecular Biophysics, Freie Universität Berlin Arnimallee 14 Berlin DE-14195 Germany
| | - Moritz Senger
- Institute of Experimental Physics, Experimental Molecular Biophysics, Freie Universität Berlin Arnimallee 14 Berlin DE-14195 Germany
| | - Sven T Stripp
- Institute of Experimental Physics, Experimental Molecular Biophysics, Freie Universität Berlin Arnimallee 14 Berlin DE-14195 Germany
| | - Gustav Berggren
- Molecular Biomimetics, Dept. of Chemistry - Ångström Laboratory, Uppsala University Lägerhyddsvägen 1 SE-75120 Uppsala Sweden
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12
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Lorent C, Katz S, Duan J, Kulka CJ, Caserta G, Teutloff C, Yadav S, Apfel UP, Winkler M, Happe T, Horch M, Zebger I. Shedding Light on Proton and Electron Dynamics in [FeFe] Hydrogenases. J Am Chem Soc 2020; 142:5493-5497. [DOI: 10.1021/jacs.9b13075] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Christian Lorent
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Sagie Katz
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Jifu Duan
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr University Bochum, 44801 Bochum, Germany
| | - Catharina Julia Kulka
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Giorgio Caserta
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Christian Teutloff
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Shanika Yadav
- Inorganic Chemistry I, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
| | - Ulf-Peter Apfel
- Inorganic Chemistry I, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
- Department of Energy, Electrosynthesis Group, Fraunhofer UMSICHT, Osterfelder Straße 3, 46047 Oberhausen, Germany
| | - Martin Winkler
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr University Bochum, 44801 Bochum, Germany
| | - Thomas Happe
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr University Bochum, 44801 Bochum, Germany
| | - Marius Horch
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
- Department of Chemistry and York Biomedical Research Institute, University of York, Heslington, York, YO10 5DD, U.K
| | - Ingo Zebger
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
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13
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Utterback JK, Ruzicka JL, Keller HR, Pellows LM, Dukovic G. Electron Transfer from Semiconductor Nanocrystals to Redox Enzymes. Annu Rev Phys Chem 2020; 71:335-359. [PMID: 32074472 DOI: 10.1146/annurev-physchem-050317-014232] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This review summarizes progress in understanding electron transfer from photoexcited nanocrystals to redox enzymes. The combination of the light-harvesting properties of nanocrystals and the catalytic properties of redox enzymes has emerged as a versatile platform to drive a variety of enzyme-catalyzed reactions with light. Transfer of a photoexcited charge from a nanocrystal to an enzyme is a critical first step for these reactions. This process has been studied in depth in systems that combine Cd-chalcogenide nanocrystals with hydrogenases. The two components can be assembled in close proximity to enable direct interfacial electron transfer or integrated with redox mediators to transport charges. Time-resolved spectroscopy and kinetic modeling have been used to measure the rates and efficiencies of the electron transfer. Electron transfer has been described within the framework of Marcus theory, providing insights into the factors that can be used to control the photochemical activity of these biohybrid systems. The range of potential applications and reactions that can be achieved using nanocrystal-enzyme systems is expanding, and numerous fundamental and practical questions remain to be addressed.
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Affiliation(s)
- James K Utterback
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, USA; , , .,Current affiliation: Department of Chemistry, University of California, Berkeley, California 94720, USA;
| | - Jesse L Ruzicka
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, USA; , ,
| | - Helena R Keller
- Materials Science and Engineering Program, University of Colorado Boulder, Boulder, Colorado 80309, USA;
| | - Lauren M Pellows
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, USA; , ,
| | - Gordana Dukovic
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, USA; , ,
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14
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Wang L, Gennari M, Barrozo A, Fize J, Philouze C, Demeshko S, Meyer F, Orio M, Artero V, Duboc C. Role of the Metal Ion in Bio-Inspired Hydrogenase Models: Investigation of a Homodinuclear FeFe Complex vs Its Heterodinuclear NiFe Analogue. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03212] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Lianke Wang
- Institutes of Physical Science and Information Technology, Anhui University, 230601 Hefei, Anhui, P. R. China
- Univ. Grenoble Alpes, UMR CNRS 5250, 38000 Grenoble, France
| | | | - Alexandre Barrozo
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France
| | - Jennifer Fize
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000 Grenoble, France
| | | | - Serhiy Demeshko
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Maylis Orio
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France
| | - Vincent Artero
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000 Grenoble, France
| | - Carole Duboc
- Univ. Grenoble Alpes, UMR CNRS 5250, 38000 Grenoble, France
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15
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Sanchez MLK, Sommer C, Reijerse E, Birrell JA, Lubitz W, Dyer RB. Investigating the Kinetic Competency of CrHydA1 [FeFe] Hydrogenase Intermediate States via Time-Resolved Infrared Spectroscopy. J Am Chem Soc 2019; 141:16064-16070. [DOI: 10.1021/jacs.9b08348] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Monica L. K. Sanchez
- Department of Chemistry, Emory University, Atlanta, Georgia 30030, United States
| | - Constanze Sommer
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Edward Reijerse
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - James A. Birrell
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - R. Brian Dyer
- Department of Chemistry, Emory University, Atlanta, Georgia 30030, United States
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16
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Németh B, Esmieu C, Redman HJ, Berggren G. Monitoring H-cluster assembly using a semi-synthetic HydF protein. Dalton Trans 2019; 48:5978-5986. [PMID: 30632592 PMCID: PMC6509880 DOI: 10.1039/c8dt04294b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 12/21/2018] [Indexed: 11/21/2022]
Abstract
The [FeFe] hydrogenase enzyme interconverts protons and molecular hydrogen with remarkable efficiency. The reaction is catalysed by a unique metallo-cofactor denoted as the H-cluster containing an organometallic dinuclear Fe component, the [2Fe] subsite. The HydF protein delivers a precursor of the [2Fe] subsite to the apo-[FeFe] hydrogenase, thus completing the H-cluster and activating the enzyme. Herein we generate a semi-synthetic form of HydF by loading it with a synthetic low valent dinuclear Fe complex. We show that this semi-synthetic protein is practically indistinguishable from the native protein, and utilize this form of HydF to explore the mechanism of H-cluster assembly. More specifically, we show that transfer of the precatalyst from HydF to the hydrogenase enzyme results in the release of CO, underscoring that the pre-catalyst is a four CO species when bound to HydF. Moreover, we propose that an electron transfer reaction occurs during H-cluster assembly, resulting in an oxidation of the [2Fe] subsite with concomitant reduction of the [4Fe4S] cluster present on the HydF protein.
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Affiliation(s)
- Brigitta Németh
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| | - Charlène Esmieu
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| | - Holly J. Redman
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| | - Gustav Berggren
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
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17
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Affiliation(s)
- Eric S. Wiedner
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999,
K2-57, Richland, Washington 99352, United States
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18
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Mebs S, Duan J, Wittkamp F, Stripp ST, Happe T, Apfel UP, Winkler M, Haumann M. Differential Protonation at the Catalytic Six-Iron Cofactor of [FeFe]-Hydrogenases Revealed by 57Fe Nuclear Resonance X-ray Scattering and Quantum Mechanics/Molecular Mechanics Analyses. Inorg Chem 2019; 58:4000-4013. [PMID: 30802044 DOI: 10.1021/acs.inorgchem.9b00100] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[FeFe]-hydrogenases are efficient biological hydrogen conversion catalysts and blueprints for technological fuel production. The relations between substrate interactions and electron/proton transfer events at their unique six-iron cofactor (H-cluster) need to be elucidated. The H-cluster comprises a four-iron cluster, [4Fe4S], linked to a diiron complex, [FeFe]. We combined 57Fe-specific X-ray nuclear resonance scattering experiments (NFS, nuclear forward scattering; NRVS, nuclear resonance vibrational spectroscopy) with quantum-mechanics/molecular-mechanics computations to study the [FeFe]-hydrogenase HYDA1 from a green alga. Selective 57Fe labeling at only [4Fe4S] or [FeFe], or at both subcomplexes was achieved by protein expression with a 57Fe salt and in vitro maturation with a synthetic diiron site precursor containing 57Fe. H-cluster states were populated under infrared spectroscopy control. NRVS spectral analyses facilitated assignment of the vibrational modes of the cofactor species. This approach revealed the H-cluster structure of the oxidized state (Hox) with a bridging carbon monoxide at [FeFe] and ligand rearrangement in the CO-inhibited state (Hox-CO). Protonation at a cysteine ligand of [4Fe4S] in the oxidized state occurring at low pH (HoxH) was indicated, in contrast to bridging hydride binding at [FeFe] in a one-electron reduced state (Hred). These findings are direct evidence for differential protonation either at the four-iron or diiron subcomplex of the H-cluster. NFS time-traces provided Mössbauer parameters such as the quadrupole splitting energy, which differ among cofactor states, thereby supporting selective protonation at either subcomplex. In combination with data for reduced states showing similar [4Fe4S] protonation as HoxH without (Hred') or with (Hhyd) a terminal hydride at [FeFe], our results imply that coordination geometry dynamics at the diiron site and proton-coupled electron transfer to either the four-iron or the diiron subcomplex discriminate catalytic and regulatory functions of [FeFe]-hydrogenases. We support a reaction cycle avoiding diiron site geometry changes during rapid H2 turnover.
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Affiliation(s)
| | | | | | | | | | - Ulf-Peter Apfel
- Fraunhofer UMSICHT , Osterfelder Straße 3 , 46047 Oberhausen , Germany
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19
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Abstract
Hydrogenases catalyze the simple yet important interconversion between H2 and protons and electrons. Found throughout prokaryotes, lower eukaryotes, and archaea, hydrogenases are used for a variety of redox and signaling purposes and are found in many different forms. This diverse group of metalloenzymes is divided into [NiFe], [FeFe], and [Fe] variants, based on the transition metal contents of their active sites. A wide array of biochemical and spectroscopic methods has been used to elucidate hydrogenases, and this along with a general description of the main enzyme types and catalytic mechanisms is discussed in this chapter.
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20
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Rana A, Kumar Das P, Mondal B, Dey S, Crouthers D, Dey A. Investigation of Bridgehead Effects on Reduction Potential in Alkyl and Aryl Azadithiolate‐Bridged (µ‐SCH
2
XCH
2
S) [Fe(CO)
3
]
2
Synthetic Analogues of [FeFe]‐H
2
ase Active Site. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Atanu Rana
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science 700032 Kolkata India
| | - Pradip Kumar Das
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science 700032 Kolkata India
| | - Biswajit Mondal
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science 700032 Kolkata India
| | - Subal Dey
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science 700032 Kolkata India
| | | | - Abhishek Dey
- Department of Inorganic Chemistry Indian Association for the Cultivation of Science 700032 Kolkata India
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21
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Scott AG, Szilagyi RK, Mulder DW, Ratzloff MW, Byer AS, King PW, Broderick WE, Shepard EM, Broderick JB. Compositional and structural insights into the nature of the H-cluster precursor on HydF. Dalton Trans 2018; 47:9521-9535. [PMID: 29964288 DOI: 10.1039/c8dt01654b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Assembly of an active [FeFe]-hydrogenase requires dedicated maturation enzymes that generate the active-site H-cluster: the radical SAM enzymes HydE and HydG synthesize the unusual non-protein ligands - carbon monoxide, cyanide, and dithiomethylamine - while the GTPase HydF serves as a scaffold for assembly of the 2Fe subcluster containing these ligands. In the current study, enzymatically cluster-loaded HydF ([2Fe]F) is produced by co-expression with HydE and HydG in an Escherichia coli host followed by isolation and examination by FTIR and EPR spectroscopy. FTIR reveals the presence of well-defined terminal CO and CN- ligands; however, unlike in the [FeFe]-hydrogenase, no bridging CO is observed. Exposure of this loaded HydF to exogenous CO or H2 produces no significant changes to the FTIR spectrum, indicating that, unlike in the [FeFe]-hydrogenase, the 2Fe cluster in loaded HydF is coordinatively saturated and relatively unreactive. EPR spectroscopy reveals the presence of both [4Fe-4S] and [2Fe-2S] clusters on this loaded HydF, but provides no direct evidence for these being linked to the [2Fe]F. Using the chemical reactivity and FTIR data, a large collection of computational models were evaluated. Their scaled quantum chemical vibrational spectra allowed us to score various [2Fe]F structures in terms of their ability to reproduce the diatomic stretching frequencies observed in the FTIR experimental spectra. Collectively, the results provide new insights that support the presence of a diamagnetic, but spin-polarized FeI-FeI oxidation state for the [2Fe]F precursor cluster that is coordinated by 4 CO and 2 CN- ligands, and bridged to an adjacent iron-sulfur cluster through one of the CN- ligands.
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Affiliation(s)
- Anna G Scott
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, USA.
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22
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Ratzloff MW, Artz JH, Mulder DW, Collins RT, Furtak TE, King PW. CO-Bridged H-Cluster Intermediates in the Catalytic Mechanism of [FeFe]-Hydrogenase CaI. J Am Chem Soc 2018; 140:7623-7628. [PMID: 29792026 DOI: 10.1021/jacs.8b03072] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The [FeFe]-hydrogenases ([FeFe] H2ases) catalyze reversible H2 activation at the H-cluster, which is composed of a [4Fe-4S]H subsite linked by a cysteine thiolate to a bridged, organometallic [2Fe-2S] ([2Fe]H) subsite. Profoundly different geometric models of the H-cluster redox states that orchestrate the electron/proton transfer steps of H2 bond activation have been proposed. We have examined this question in the [FeFe] H2ase I from Clostridium acetobutylicum (CaI) by Fourier-transform infrared (FTIR) spectroscopy with temperature annealing and H/D isotope exchange to identify the relevant redox states and define catalytic transitions. One-electron reduction of Hox led to formation of HredH+ ([4Fe-4S]H2+-FeI-FeI) and Hred' ([4Fe-4S]H1+-FeII-FeI), with both states characterized by low frequency μ-CO IR modes consistent with a fully bridged [2Fe]H. Similar μ-CO IR modes were also identified for HredH+ of the [FeFe] H2ase from Chlamydomonas reinhardtii (CrHydA1). The CaI proton-transfer variant C298S showed enrichment of an H/D isotope-sensitive μ-CO mode, a component of the hydride bound H-cluster IR signal, Hhyd. Equilibrating CaI with increasing amounts of NaDT, and probed at cryogenic temperatures, showed HredH+ was converted to Hhyd. Over an increasing temperature range from 10 to 260 K catalytic turnover led to loss of Hhyd and appearance of Hox, consistent with enzymatic turnover and H2 formation. The results show for CaI that the μ-CO of [2Fe]H remains bridging for all of the "Hred" states and that HredH+ is on pathway to Hhyd and H2 evolution in the catalytic mechanism. These results provide a blueprint for designing small molecule catalytic analogs.
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Affiliation(s)
- Michael W Ratzloff
- Biosciences Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Jacob H Artz
- Biosciences Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - David W Mulder
- Biosciences Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Reuben T Collins
- Physics Department , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Thomas E Furtak
- Physics Department , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Paul W King
- Biosciences Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
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23
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Del Barrio M, Sensi M, Fradale L, Bruschi M, Greco C, de Gioia L, Bertini L, Fourmond V, Léger C. Interaction of the H-Cluster of FeFe Hydrogenase with Halides. J Am Chem Soc 2018; 140:5485-5492. [PMID: 29590528 DOI: 10.1021/jacs.8b01414] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
FeFe hydrogenases catalyze H2 oxidation and production using an "H-cluster", where two Fe ions are bound by an aza-dithiolate (adt) ligand. Various hypotheses have been proposed (by us and others) to explain that the enzyme reversibly inactivates under oxidizing, anaerobic conditions: intramolecular binding of the N atom of adt, formation of the so-called "Hox/inact" state or nonproductive binding of H2 to isomers of the H-cluster. Here, we show that none of the above explains the new finding that the anaerobic, oxidative, H2-dependent reversible inactivation is strictly dependent on the presence of Cl- or Br-. We provide experimental evidence that chloride uncompetitively inhibits the enzyme: it reversibly binds to catalytic intermediates of H2 oxidation (but not to the resting "Hox" state), after which oxidation locks the active site into a stable, saturated, inactive form, the structure of which is proposed here based on DFT calculations. The halides interact with the amine group of the H-cluster but do not directly bind to iron. It should be possible to stabilize the inhibited state in amounts compatible with spectroscopic investigations to explore further this unexpected reactivity of the H-cluster of hydrogenase.
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Affiliation(s)
- Melisa Del Barrio
- Aix Marseille Université , CNRS, Bioénergétique et Ingénierie des Protéines , Marseille , France
| | - Matteo Sensi
- Aix Marseille Université , CNRS, Bioénergétique et Ingénierie des Protéines , Marseille , France
| | - Laura Fradale
- Aix Marseille Université , CNRS, Bioénergétique et Ingénierie des Protéines , Marseille , France
| | - Maurizio Bruschi
- Department of Earth and Environmental Sciences , University of Milano-Bicocca , 20126 Milan , Italy
| | - Claudio Greco
- Department of Earth and Environmental Sciences , University of Milano-Bicocca , 20126 Milan , Italy
| | - Luca de Gioia
- Department of Biotechnologies and Biosciences , University of Milano-Bicocca , 20126 Milan , Italy
| | - Luca Bertini
- Department of Biotechnologies and Biosciences , University of Milano-Bicocca , 20126 Milan , Italy
| | - Vincent Fourmond
- Aix Marseille Université , CNRS, Bioénergétique et Ingénierie des Protéines , Marseille , France
| | - Christophe Léger
- Aix Marseille Université , CNRS, Bioénergétique et Ingénierie des Protéines , Marseille , France
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24
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Mészáros LS, Németh B, Esmieu C, Ceccaldi P, Berggren G. In Vivo EPR Characterization of Semi-Synthetic [FeFe] Hydrogenases. Angew Chem Int Ed Engl 2018; 57:2596-2599. [PMID: 29334424 PMCID: PMC6282530 DOI: 10.1002/anie.201710740] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 12/18/2018] [Indexed: 01/18/2023]
Abstract
EPR spectroscopy reveals the formation of two different semi-synthetic hydrogenases in vivo. [FeFe] hydrogenases are metalloenzymes that catalyze the interconversion of molecular hydrogen and protons. The reaction is catalyzed by the H-cluster, consisting of a canonical iron-sulfur cluster and an organometallic [2Fe] subsite. It was recently shown that the enzyme can be reconstituted with synthetic cofactors mimicking the composition of the [2Fe] subsite, resulting in semi-synthetic hydrogenases. Herein, we employ EPR spectroscopy to monitor the formation of two such semi-synthetic enzymes in whole cells. The study provides the first spectroscopic characterization of semi-synthetic hydrogenases in vivo, and the observation of two different oxidized states of the H-cluster under intracellular conditions. Moreover, these findings underscore how synthetic chemistry can be a powerful tool for manipulation and examination of the hydrogenase enzyme under in vivo conditions.
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Affiliation(s)
- Lívia S. Mészáros
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Brigitta Németh
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Charlène Esmieu
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Pierre Ceccaldi
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Gustav Berggren
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
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25
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Senger M, Mebs S, Duan J, Shulenina O, Laun K, Kertess L, Wittkamp F, Apfel UP, Happe T, Winkler M, Haumann M, Stripp ST. Protonation/reduction dynamics at the [4Fe-4S] cluster of the hydrogen-forming cofactor in [FeFe]-hydrogenases. Phys Chem Chem Phys 2018; 20:3128-3140. [PMID: 28884175 DOI: 10.1039/c7cp04757f] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The [FeFe]-hydrogenases of bacteria and algae are the most efficient hydrogen conversion catalysts in nature. Their active-site cofactor (H-cluster) comprises a [4Fe-4S] cluster linked to a unique diiron site that binds three carbon monoxide (CO) and two cyanide (CN-) ligands. Understanding microbial hydrogen conversion requires elucidation of the interplay of proton and electron transfer events at the H-cluster. We performed real-time spectroscopy on [FeFe]-hydrogenase protein films under controlled variation of atmospheric gas composition, sample pH, and reductant concentration. Attenuated total reflection Fourier-transform infrared spectroscopy was used to monitor shifts of the CO/CN- vibrational bands in response to redox and protonation changes. Three different [FeFe]-hydrogenases and several protein and cofactor variants were compared, including element and isotopic exchange studies. A protonated equivalent (HoxH) of the oxidized state (Hox) was found, which preferentially accumulated at acidic pH and under reducing conditions. We show that the one-electron reduced state Hred' represents an intrinsically protonated species. Interestingly, the formation of HoxH and Hred' was independent of the established proton pathway to the diiron site. Quantum chemical calculations of the respective CO/CN- infrared band patterns favored a cysteine ligand of the [4Fe-4S] cluster as the protonation site in HoxH and Hred'. We propose that proton-coupled electron transfer facilitates reduction of the [4Fe-4S] cluster and prevents premature formation of a hydride at the catalytic diiron site. Our findings imply that protonation events both at the [4Fe-4S] cluster and at the diiron site of the H-cluster are important in the hydrogen conversion reaction of [FeFe]-hydrogenases.
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Affiliation(s)
- Moritz Senger
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany.
| | - Stefan Mebs
- Department of Physics, Biophysics of Metalloenzymes, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
| | - Jifu Duan
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum, 44801 Bochum, Germany.
| | - Olga Shulenina
- Faculty of Physics, St. Petersburg State University, 198504 St. Petersburg, Russian Federation
| | - Konstantin Laun
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany.
| | - Leonie Kertess
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum, 44801 Bochum, Germany.
| | - Florian Wittkamp
- Faculty of Chemistry and Biochemistry, Inorganic Chemistry I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Ulf-Peter Apfel
- Faculty of Chemistry and Biochemistry, Inorganic Chemistry I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Thomas Happe
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum, 44801 Bochum, Germany.
| | - Martin Winkler
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum, 44801 Bochum, Germany.
| | - Michael Haumann
- Department of Physics, Biophysics of Metalloenzymes, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
| | - Sven T Stripp
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany.
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26
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Mészáros LS, Németh B, Esmieu C, Ceccaldi P, Berggren G. In Vivo EPR Characterization of Semi-Synthetic [FeFe] Hydrogenases. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201710740] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lívia S. Mészáros
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Brigitta Németh
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Charlène Esmieu
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Pierre Ceccaldi
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Gustav Berggren
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
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27
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Rumpel S, Ravera E, Sommer C, Reijerse E, Farès C, Luchinat C, Lubitz W. 1H NMR Spectroscopy of [FeFe] Hydrogenase: Insight into the Electronic Structure of the Active Site. J Am Chem Soc 2018; 140:131-134. [PMID: 29211457 PMCID: PMC5765528 DOI: 10.1021/jacs.7b11196] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The [FeFe] hydrogenase
HydA1 from Chlamydomonas reinhardtii has been studied
using 1H NMR spectroscopy identifying
the paramagnetically shifted 1H resonances associated with
both the [4Fe-4S]H and the
[2Fe]H subclusters of the active site “H-cluster”.
The signal pattern of the unmaturated HydA1 containing only [4Fe-4S]H is reminiscent of bacterial-type ferredoxins. The spectra
of maturated HydA1, with a complete H-cluster in the active Hox and the CO-inhibited Hox–CO state, reveal
additional upfield and downfield shifted 1H resonances
originating from the four methylene protons of the azadithiolate ligand
in the [2Fe]H subsite. The two axial protons are affected
by positive spin density, while the two equatorial protons experience
negative spin density. These protons can be used as important probes
sensing the effects of ligand-binding to the catalytic site of the
H-cluster.
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Affiliation(s)
- Sigrun Rumpel
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Enrico Ravera
- Department of Chemistry "Ugo Schiff" and Magnetic Resonance Center (CERM), University of Florence and Interuniversity Consortium for Magnetic Resonance of Metallo Proteins (CIRMMP) , Via L. Sacconi 6, 50019 Sesto Fiorentino, Italy
| | - Constanze Sommer
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Edward Reijerse
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Christophe Farès
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Claudio Luchinat
- Department of Chemistry "Ugo Schiff" and Magnetic Resonance Center (CERM), University of Florence and Interuniversity Consortium for Magnetic Resonance of Metallo Proteins (CIRMMP) , Via L. Sacconi 6, 50019 Sesto Fiorentino, Italy
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
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28
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29
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Mebs S, Kositzki R, Duan J, Kertess L, Senger M, Wittkamp F, Apfel UP, Happe T, Stripp ST, Winkler M, Haumann M. Hydrogen and oxygen trapping at the H-cluster of [FeFe]-hydrogenase revealed by site-selective spectroscopy and QM/MM calculations. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:28-41. [DOI: 10.1016/j.bbabio.2017.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 08/31/2017] [Accepted: 09/13/2017] [Indexed: 12/11/2022]
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30
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Senger M, Laun K, Wittkamp F, Duan J, Haumann M, Happe T, Winkler M, Apfel UP, Stripp ST. Protonengekoppelte Reduktion des katalytischen [4Fe-4S]-Zentrums in [FeFe]-Hydrogenasen. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709910] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Moritz Senger
- Fakultät für Physik; Freie Universität Berlin; Arnimallee 14 1495 Berlin Deutschland
| | - Konstantin Laun
- Fakultät für Physik; Freie Universität Berlin; Arnimallee 14 1495 Berlin Deutschland
| | - Florian Wittkamp
- Fakultät für Chemie und Biochemie; Ruhr-Universität Bochum; Universitätstraße 150 44801 Bochum Deutschland
| | - Jifu Duan
- Fakultät für Biologie und Biotechnologie; Ruhr-Universität Bochum; Universitätsstraße 150 44801 Bochum Deutschland
| | - Michael Haumann
- Fakultät für Physik; Freie Universität Berlin; Arnimallee 14 1495 Berlin Deutschland
| | - Thomas Happe
- Fakultät für Biologie und Biotechnologie; Ruhr-Universität Bochum; Universitätsstraße 150 44801 Bochum Deutschland
| | - Martin Winkler
- Fakultät für Biologie und Biotechnologie; Ruhr-Universität Bochum; Universitätsstraße 150 44801 Bochum Deutschland
| | - Ulf-Peter Apfel
- Fakultät für Chemie und Biochemie; Ruhr-Universität Bochum; Universitätstraße 150 44801 Bochum Deutschland
| | - Sven T. Stripp
- Fakultät für Physik; Freie Universität Berlin; Arnimallee 14 1495 Berlin Deutschland
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31
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Senger M, Laun K, Wittkamp F, Duan J, Haumann M, Happe T, Winkler M, Apfel UP, Stripp ST. Proton-Coupled Reduction of the Catalytic [4Fe-4S] Cluster in [FeFe]-Hydrogenases. Angew Chem Int Ed Engl 2017; 56:16503-16506. [PMID: 29072356 DOI: 10.1002/anie.201709910] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 10/23/2017] [Indexed: 12/25/2022]
Abstract
In nature, [FeFe]-hydrogenases catalyze the uptake and release of molecular hydrogen (H2 ) at a unique iron-sulfur cofactor. The absence of an electrochemical overpotential in the H2 release reaction makes [FeFe]-hydrogenases a prime example of efficient biocatalysis. However, the molecular details of hydrogen turnover are not yet fully understood. Herein, we characterize the initial one-electron reduction of [FeFe]-hydrogenases by infrared spectroscopy and electrochemistry and present evidence for proton-coupled electron transport during the formation of the reduced state Hred'. Charge compensation stabilizes the excess electron at the [4Fe-4S] cluster and maintains a conservative configuration of the diiron site. The role of Hred' in hydrogen turnover and possible implications on the catalytic mechanism are discussed. We propose that regulation of the electronic properties in the periphery of metal cofactors is key to orchestrating multielectron processes.
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Affiliation(s)
- Moritz Senger
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 1495, Berlin, Germany
| | - Konstantin Laun
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 1495, Berlin, Germany
| | - Florian Wittkamp
- Faculty of Chemistry and Biochemistry, Ruhr-Universität Bochum, Universitätstrasse 150, 44801, Bochum, Germany
| | - Jifu Duan
- Faculty of Biology and Biotechnology, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801, Bochum, Germany
| | - Michael Haumann
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 1495, Berlin, Germany
| | - Thomas Happe
- Faculty of Biology and Biotechnology, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801, Bochum, Germany
| | - Martin Winkler
- Faculty of Biology and Biotechnology, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801, Bochum, Germany
| | - Ulf-Peter Apfel
- Faculty of Chemistry and Biochemistry, Ruhr-Universität Bochum, Universitätstrasse 150, 44801, Bochum, Germany
| | - Sven T Stripp
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 1495, Berlin, Germany
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32
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Sensi M, Baffert C, Fradale L, Gauquelin C, Soucaille P, Meynial-Salles I, Bottin H, de Gioia L, Bruschi M, Fourmond V, Léger C, Bertini L. Photoinhibition of FeFe Hydrogenase. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02252] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Matteo Sensi
- Aix Marseille University, CNRS, BIP UMR 7281, 13402 CEDEX 20 Marseille, France
- Department
of Biotechnologies and Biosciences, University of Milano-Bicocca, Piazza
della Scienza 2, 20126 Milan, Italy
| | - Carole Baffert
- Aix Marseille University, CNRS, BIP UMR 7281, 13402 CEDEX 20 Marseille, France
| | - Laura Fradale
- Aix Marseille University, CNRS, BIP UMR 7281, 13402 CEDEX 20 Marseille, France
| | - Charles Gauquelin
- Université de Toulouse, INSA, UPS, INP, LISBP, INRA:UMR792,135
CNRS:UMR 5504, Avenue
de Rangueil, 31077 Toulouse, France
| | - Philippe Soucaille
- Université de Toulouse, INSA, UPS, INP, LISBP, INRA:UMR792,135
CNRS:UMR 5504, Avenue
de Rangueil, 31077 Toulouse, France
| | - Isabelle Meynial-Salles
- Université de Toulouse, INSA, UPS, INP, LISBP, INRA:UMR792,135
CNRS:UMR 5504, Avenue
de Rangueil, 31077 Toulouse, France
| | - Hervé Bottin
- Institut
de Biologie Intégrative de la Cellule (I2BC), Institut Frédéric
Joliot, CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, F-91198 CEDEX Gif-Sur-Yvette, France
| | - Luca de Gioia
- Department
of Biotechnologies and Biosciences, University of Milano-Bicocca, Piazza
della Scienza 2, 20126 Milan, Italy
| | - Maurizio Bruschi
- Department
of Earth and Environmental Sciences, Milano-Bicocca University, Piazza della
Scienza 1, 20126 Milan, Italy
- Department
of Biotechnologies and Biosciences, University of Milano-Bicocca, Piazza
della Scienza 2, 20126 Milan, Italy
| | - Vincent Fourmond
- Aix Marseille University, CNRS, BIP UMR 7281, 13402 CEDEX 20 Marseille, France
| | - Christophe Léger
- Aix Marseille University, CNRS, BIP UMR 7281, 13402 CEDEX 20 Marseille, France
| | - Luca Bertini
- Department
of Biotechnologies and Biosciences, University of Milano-Bicocca, Piazza
della Scienza 2, 20126 Milan, Italy
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33
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Ratzloff MW, Wilker MB, Mulder DW, Lubner CE, Hamby H, Brown KA, Dukovic G, King PW. Activation Thermodynamics and H/D Kinetic Isotope Effect of the Hox to HredH+ Transition in [FeFe] Hydrogenase. J Am Chem Soc 2017; 139:12879-12882. [DOI: 10.1021/jacs.7b04216] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Michael W. Ratzloff
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Molly B. Wilker
- Department
of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - David W. Mulder
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Carolyn E. Lubner
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Hayden Hamby
- Department
of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Katherine A. Brown
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Gordana Dukovic
- Department
of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Paul W. King
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
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34
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Mebs S, Senger M, Duan J, Wittkamp F, Apfel UP, Happe T, Winkler M, Stripp ST, Haumann M. Bridging Hydride at Reduced H-Cluster Species in [FeFe]-Hydrogenases Revealed by Infrared Spectroscopy, Isotope Editing, and Quantum Chemistry. J Am Chem Soc 2017; 139:12157-12160. [PMID: 28825810 DOI: 10.1021/jacs.7b07548] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
[FeFe]-Hydrogenases contain a H2-converting cofactor (H-cluster) in which a canonical [4Fe-4S] cluster is linked to a unique diiron site with three carbon monoxide (CO) and two cyanide (CN-) ligands (e.g., in the oxidized state, Hox). There has been much debate whether reduction and hydrogen binding may result in alternative rotamer structures of the diiron site in a single (Hred) or double (Hsred) reduced H-cluster species. We employed infrared spectro-electrochemistry and site-selective isotope editing to monitor the CO/CN- stretching vibrations in [FeFe]-hydrogenase HYDA1 from Chlamydomonas reinhardtii. Density functional theory calculations yielded vibrational modes of the diatomic ligands for conceivable H-cluster structures. Correlation analysis of experimental and computational IR spectra has facilitated an assignment of Hred and Hsred to structures with a bridging hydride at the diiron site. Pronounced ligand rotation during μH binding seems to exclude Hred and Hsred as catalytic intermediates. Only states with a conservative H-cluster geometry featuring a μCO ligand are likely involved in rapid H2 turnover.
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Affiliation(s)
- Stefan Mebs
- Department of Physics, Biophysics of Metalloenzymes, Freie Universität Berlin , 14195 Berlin, Germany
| | - Moritz Senger
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin , 14195 Berlin, Germany
| | - Jifu Duan
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum , 44801 Bochum, Germany
| | - Florian Wittkamp
- Faculty of Chemistry and Biochemistry, Bioinorganic Chemistry, Ruhr-Universität Bochum , 44801 Bochum, Germany
| | - Ulf-Peter Apfel
- Faculty of Chemistry and Biochemistry, Bioinorganic Chemistry, Ruhr-Universität Bochum , 44801 Bochum, Germany
| | - Thomas Happe
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum , 44801 Bochum, Germany
| | - Martin Winkler
- Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr-Universität Bochum , 44801 Bochum, Germany
| | - Sven T Stripp
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin , 14195 Berlin, Germany
| | - Michael Haumann
- Department of Physics, Biophysics of Metalloenzymes, Freie Universität Berlin , 14195 Berlin, Germany
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35
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Artz JH, Mulder DW, Ratzloff MW, Lubner CE, Zadvornyy OA, LeVan AX, Williams SG, Adams MWW, Jones AK, King PW, Peters JW. Reduction Potentials of [FeFe]-Hydrogenase Accessory Iron-Sulfur Clusters Provide Insights into the Energetics of Proton Reduction Catalysis. J Am Chem Soc 2017. [PMID: 28635269 DOI: 10.1021/jacs.7b02099] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
An [FeFe]-hydrogenase from Clostridium pasteurianum, CpI, is a model system for biological H2 activation. In addition to the catalytic H-cluster, CpI contains four accessory iron-sulfur [FeS] clusters in a branched series that transfer electrons to and from the active site. In this work, potentiometric titrations have been employed in combination with electron paramagnetic resonance (EPR) spectroscopy at defined electrochemical potentials to gain insights into the role of the accessory clusters in catalysis. EPR spectra collected over a range of potentials were deconvoluted into individual components attributable to the accessory [FeS] clusters and the active site H-cluster, and reduction potentials for each cluster were determined. The data suggest a large degree of magnetic coupling between the clusters. The distal [4Fe-4S] cluster is shown to have a lower reduction potential (∼ < -450 mV) than the other clusters, and molecular docking experiments indicate that the physiological electron donor, ferredoxin (Fd), most favorably interacts with this cluster. The low reduction potential of the distal [4Fe-4S] cluster thermodynamically restricts the Fdox/Fdred ratio at which CpI can operate, consistent with the role of CpI in recycling Fdred that accumulates during fermentation. Subsequent electron transfer through the additional accessory [FeS] clusters to the H-cluster is thermodynamically favorable.
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Affiliation(s)
- Jacob H Artz
- Institute of Biological Chemistry, Washington State University , 258 Clark Hall, Pullman, Washington 99163, United States
| | - David W Mulder
- Biosciences Center, National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Michael W Ratzloff
- Biosciences Center, National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Carolyn E Lubner
- Biosciences Center, National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Oleg A Zadvornyy
- Institute of Biological Chemistry, Washington State University , 258 Clark Hall, Pullman, Washington 99163, United States
| | - Axl X LeVan
- Department of Chemistry and Biochemistry, Montana State University , 224 Chemistry and Biochemistry Building, Bozeman, Montana 59717, United States
| | - S Garrett Williams
- School of Molecular Sciences, Arizona State University , P.O. Box 871604, Tempe, Arizona 85287, United States
| | - Michael W W Adams
- B216B Life Sciences Complex, Department of Biochemistry, The University of Georgia , Athens, Georgia 30602, United States
| | - Anne K Jones
- School of Molecular Sciences, Arizona State University , P.O. Box 871604, Tempe, Arizona 85287, United States
| | - Paul W King
- Biosciences Center, National Renewable Energy Laboratory , 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - John W Peters
- Institute of Biological Chemistry, Washington State University , 258 Clark Hall, Pullman, Washington 99163, United States
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36
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Zhang X, Zhang T, Li B, Zhang G, Hai L, Ma X, Wu W, Jiang S. Effect of the Terminal Ligands of [FeFe]-Hydrogenase Model Complexes on Proton Reduction Properties and Catalytic Hydroxylation of Benzene. ChemistrySelect 2017. [DOI: 10.1002/slct.201700394] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Xia Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
| | - Tianyong Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
| | - Bin Li
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
| | - Guanghui Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Li Hai
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Xiaoyuan Ma
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Wubin Wu
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Shuang Jiang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
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37
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Greene BL, Schut GJ, Adams MWW, Dyer RB. Pre-Steady-State Kinetics of Catalytic Intermediates of an [FeFe]-Hydrogenase. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03276] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Brandon L. Greene
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Gerrit J. Schut
- Department
of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, United States
| | - Michael W. W. Adams
- Department
of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, United States
| | - R. Brian Dyer
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
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38
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Mulder DW, Guo Y, Ratzloff MW, King PW. Identification of a Catalytic Iron-Hydride at the H-Cluster of [FeFe]-Hydrogenase. J Am Chem Soc 2016; 139:83-86. [PMID: 27973768 DOI: 10.1021/jacs.6b11409] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Hydrogenases couple electrochemical potential to the reversible chemical transformation of H2 and protons, yet the reaction mechanism and composition of intermediates are not fully understood. In this Communication we describe the biophysical properties of a hydride-bound state (Hhyd) of the [FeFe]-hydrogenase from Chlamydomonas reinhardtii. The catalytic H-cluster of [FeFe]-hydrogenase consists of a [4Fe-4S] subcluster ([4Fe-4S]H) linked by a cysteine thiol to an azadithiolate-bridged 2Fe subcluster ([2Fe]H) with CO and CN- ligands. Mössbauer analysis and density functional theory (DFT) calculations show that Hhyd consists of a reduced [4Fe-4S]H+ coupled to a diferrous [2Fe]H with a terminally bound Fe-hydride. The existence of the Fe-hydride in Hhyd was demonstrated by an unusually low Mössbauer isomer shift of the distal Fe of the [2Fe]H subcluster. A DFT model of Hhyd shows that the Fe-hydride is part of a H-bonding network with the nearby bridging azadithiolate to facilitate fast proton exchange and catalytic turnover.
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Affiliation(s)
- David W Mulder
- Biosciences Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States
| | - Yisong Guo
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Michael W Ratzloff
- Biosciences Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States
| | - Paul W King
- Biosciences Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States
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39
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Morra S, Valetti F, Gilardi G. [FeFe]-hydrogenases as biocatalysts in bio-hydrogen production. RENDICONTI LINCEI 2016. [DOI: 10.1007/s12210-016-0584-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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40
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Katz S, Noth J, Horch M, Shafaat HS, Happe T, Hildebrandt P, Zebger I. Vibrational spectroscopy reveals the initial steps of biological hydrogen evolution. Chem Sci 2016; 7:6746-6752. [PMID: 28451119 PMCID: PMC5355867 DOI: 10.1039/c6sc01098a] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 06/29/2016] [Indexed: 12/30/2022] Open
Abstract
[FeFe] hydrogenases are biocatalytic model systems for the exploitation and investigation of catalytic hydrogen evolution. Here, we used vibrational spectroscopic techniques to characterize, in detail, redox transformations of the [FeFe] and [4Fe4S] sub-sites of the catalytic centre (H-cluster) in a monomeric [FeFe] hydrogenase. Through the application of low-temperature resonance Raman spectroscopy, we discovered a novel metastable intermediate that is characterized by an oxidized [FeIFeII] centre and a reduced [4Fe4S]1+ cluster. Based on this unusual configuration, this species is assigned to the first, deprotonated H-cluster intermediate of the [FeFe] hydrogenase catalytic cycle. Providing insights into the sequence of initial reaction steps, the identification of this species represents a key finding towards the mechanistic understanding of biological hydrogen evolution.
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Affiliation(s)
- S Katz
- Institut für Chemie , Technische Universitaet Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany . ;
| | - J Noth
- Fakultaet für Biologie und Biotechnologie , Lehrstuhl für Biochemie der Pflanzen , AG Photobiotechnologie , Ruhr-Universitaet Bochum , Universitaetsstrasse 150 , D-44801 Bochum , Germany
| | - M Horch
- Institut für Chemie , Technische Universitaet Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany . ;
| | - H S Shafaat
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstraße 34-36 , D-45470 , Muelheim an der Ruhr , Germany
| | - T Happe
- Fakultaet für Biologie und Biotechnologie , Lehrstuhl für Biochemie der Pflanzen , AG Photobiotechnologie , Ruhr-Universitaet Bochum , Universitaetsstrasse 150 , D-44801 Bochum , Germany
| | - P Hildebrandt
- Institut für Chemie , Technische Universitaet Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany . ;
| | - I Zebger
- Institut für Chemie , Technische Universitaet Berlin , Strasse des 17. Juni 135 , D-10623 Berlin , Germany . ;
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41
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Stepwise isotope editing of [FeFe]-hydrogenases exposes cofactor dynamics. Proc Natl Acad Sci U S A 2016; 113:8454-9. [PMID: 27432985 DOI: 10.1073/pnas.1606178113] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The six-iron cofactor of [FeFe]-hydrogenases (H-cluster) is the most efficient H2-forming catalyst in nature. It comprises a diiron active site with three carbon monoxide (CO) and two cyanide (CN(-)) ligands in the active oxidized state (Hox) and one additional CO ligand in the inhibited state (Hox-CO). The diatomic ligands are sensitive reporter groups for structural changes of the cofactor. Their vibrational dynamics were monitored by real-time attenuated total reflection Fourier-transform infrared spectroscopy. Combination of (13)CO gas exposure, blue or red light irradiation, and controlled hydration of three different [FeFe]-hydrogenase proteins produced 8 Hox and 16 Hox-CO species with all possible isotopic exchange patterns. Extensive density functional theory calculations revealed the vibrational mode couplings of the carbonyl ligands and uniquely assigned each infrared spectrum to a specific labeling pattern. For Hox-CO, agreement between experimental and calculated infrared frequencies improved by up to one order of magnitude for an apical CN(-) at the distal iron ion of the cofactor as opposed to an apical CO. For Hox, two equally probable isomers with partially rotated ligands were suggested. Interconversion between these structures implies dynamic ligand reorientation at the H-cluster. Our experimental protocol for site-selective (13)CO isotope editing combined with computational species assignment opens new perspectives for characterization of functional intermediates in the catalytic cycle.
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42
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Caserta G, Adamska-Venkatesh A, Pecqueur L, Atta M, Artero V, Roy S, Reijerse E, Lubitz W, Fontecave M. Chemical assembly of multiple metal cofactors: The heterologously expressed multidomain [FeFe]-hydrogenase from Megasphaera elsdenii. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1857:1734-1740. [PMID: 27421233 DOI: 10.1016/j.bbabio.2016.07.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 07/03/2016] [Accepted: 07/10/2016] [Indexed: 10/21/2022]
Abstract
[FeFe]-hydrogenases are unique and fascinating enzymes catalyzing the reversible reduction of protons into hydrogen. These metalloenzymes display extremely large catalytic reaction rates at very low overpotential values and are, therefore, studied as potential catalysts for bioelectrodes of electrolyzers and fuel cells. Since they contain multiple metal cofactors whose biosynthesis depends on complex protein machineries, their preparation is difficult. As a consequence still few have been purified to homogeneity allowing spectroscopic and structural characterization. As part of a program aiming at getting easy access to new hydrogenases we report here a methodology based on a purely chemical assembly of their metal cofactors. This methodology is applied to the preparation and characterization of the hydrogenase from the fermentative anaerobic rumen bacterium Megasphaera elsdenii, which has only been incompletely characterized in the past.
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Affiliation(s)
- Giorgio Caserta
- Laboratoire de Chimie des Processus Biologiques, Collège de France, Université Pierre et Marie Curie, CNRS UMR 8229, 11 place Marcelin Berthelot, 75005 Paris, France
| | | | - Ludovic Pecqueur
- Laboratoire de Chimie des Processus Biologiques, Collège de France, Université Pierre et Marie Curie, CNRS UMR 8229, 11 place Marcelin Berthelot, 75005 Paris, France
| | - Mohamed Atta
- Laboratoire de Chimie et Biologie des Métaux, Université Grenoble Alpes, CEA/BIG, CNRS, 17 rue des martyrs, 38000 Grenoble, France
| | - Vincent Artero
- Laboratoire de Chimie et Biologie des Métaux, Université Grenoble Alpes, CEA/BIG, CNRS, 17 rue des martyrs, 38000 Grenoble, France
| | - Souvik Roy
- Laboratoire de Chimie et Biologie des Métaux, Université Grenoble Alpes, CEA/BIG, CNRS, 17 rue des martyrs, 38000 Grenoble, France
| | - Edward Reijerse
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques, Collège de France, Université Pierre et Marie Curie, CNRS UMR 8229, 11 place Marcelin Berthelot, 75005 Paris, France.
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43
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Liu YC, Chu KT, Huang YL, Hsu CH, Lee GH, Tseng MC, Chiang MH. Protonation/Reduction of Carbonyl-Rich Diiron Complexes and the Direct Observation of Triprotonated Species: Insights into the Electrocatalytic Mechanism of Hydrogen Formation. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02646] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu-Chiao Liu
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Kai-Ti Chu
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
- Molecular
Science and Technology Program, TIGP, Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
- Department
of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Yi-Lan Huang
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Cheng-Huey Hsu
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Gene-Hsiang Lee
- Instrumentation
Center, National Taiwan University, Taipei 106, Taiwan
| | - Mei-Chun Tseng
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Ming-Hsi Chiang
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
- Molecular
Science and Technology Program, TIGP, Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
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44
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Morra S, Maurelli S, Chiesa M, Mulder DW, Ratzloff MW, Giamello E, King PW, Gilardi G, Valetti F. The effect of a C298D mutation in CaHydA [FeFe]-hydrogenase: Insights into the protein-metal cluster interaction by EPR and FTIR spectroscopic investigation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1857:98-106. [PMID: 26482707 DOI: 10.1016/j.bbabio.2015.10.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 10/01/2015] [Accepted: 10/15/2015] [Indexed: 01/17/2023]
Abstract
A conserved cysteine located in the signature motif of the catalytic center (H-cluster) of [FeFe]-hydrogenases functions in proton transfer. This residue corresponds to C298 in Clostridium acetobutylicum CaHydA. Despite the chemical and structural difference, the mutant C298D retains fast catalytic activity, while replacement with any other amino acid causes significant activity loss. Given the proximity of C298 to the H-cluster, the effect of the C298D mutation on the catalytic center was studied by continuous wave (CW) and pulse electron paramagnetic resonance (EPR) and by Fourier transform infrared (FTIR) spectroscopies. Comparison of the C298D mutant with the wild type CaHydA by CW and pulse EPR showed that the electronic structure of the center is not altered. FTIR spectroscopy confirmed that absorption peak values observed in the mutant are virtually identical to those observed in the wild type, indicating that the H-cluster is not generally affected by the mutation. Significant differences were observed only in the inhibited state Hox-CO: the vibrational modes assigned to the COexo and Fed-CO in this state are shifted to lower values in C298D, suggesting different interaction of these ligands with the protein moiety when C298 is changed to D298. More relevant to the catalytic cycle, the redox equilibrium between the Hox and Hred states is modified by the mutation, causing a prevalence of the oxidized state. This work highlights how the interactions between the protein environment and the H-cluster, a dynamic closely interconnected system, can be engineered and studied in the perspective of designing bio-inspired catalysts and mimics.
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Affiliation(s)
- Simone Morra
- Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy
| | - Sara Maurelli
- Department of Chemistry, University of Torino, Torino 10133, Italy
| | - Mario Chiesa
- Department of Chemistry, University of Torino, Torino 10133, Italy
| | - David W Mulder
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO 80401, USA
| | - Michael W Ratzloff
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO 80401, USA
| | - Elio Giamello
- Department of Chemistry, University of Torino, Torino 10133, Italy
| | - Paul W King
- Biosciences Center, National Renewable Energy Laboratory, Golden, CO 80401, USA
| | - Gianfranco Gilardi
- Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy
| | - Francesca Valetti
- Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy.
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Morra S, Cordara A, Gilardi G, Valetti F. Atypical effect of temperature tuning on the insertion of the catalytic iron-sulfur center in a recombinant [FeFe]-hydrogenase. Protein Sci 2015; 24:2090-4. [PMID: 26362685 DOI: 10.1002/pro.2805] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 09/08/2015] [Accepted: 09/11/2015] [Indexed: 01/04/2023]
Abstract
The expression of recombinant [FeFe]-hydrogenases is an important step for the production of large amount of these enzymes for their exploitation in biotechnology and for the characterization of the protein-metal cofactor interactions. The correct assembly of the organometallic catalytic site, named H-cluster, requires a dedicated set of maturases that must be coexpressed in the microbial hosts or used for in vitro assembly of the active enzymes. In this work, the effect of the post-induction temperature on the recombinant expression of CaHydA [FeFe]-hydrogenase in E. coli is investigated. The results show a peculiar behavior: the enzyme expression is maximum at lower temperatures (20°C), while the specific activity of the purified CaHydA is higher at higher temperature (30°C), as a consequence of improved protein folding and active site incorporation.
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Affiliation(s)
- Simone Morra
- Department of Life Sciences and Systems Biology, University of Torino, via Accademia Albertina 13, Torino, 10123, Italy
| | - Alessandro Cordara
- Department of Life Sciences and Systems Biology, University of Torino, via Accademia Albertina 13, Torino, 10123, Italy
| | - Gianfranco Gilardi
- Department of Life Sciences and Systems Biology, University of Torino, via Accademia Albertina 13, Torino, 10123, Italy
| | - Francesca Valetti
- Department of Life Sciences and Systems Biology, University of Torino, via Accademia Albertina 13, Torino, 10123, Italy
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Ghirardi ML. Implementation of photobiological H2 production: the O 2 sensitivity of hydrogenases. PHOTOSYNTHESIS RESEARCH 2015; 125:383-93. [PMID: 26022106 DOI: 10.1007/s11120-015-0158-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 05/13/2015] [Indexed: 05/10/2023]
Abstract
The search for the ultimate carbon-free fuel has intensified in recent years, with a major focus on photoproduction of H2. Biological sources of H2 include oxygenic photosynthetic green algae and cyanobacteria, both of which contain hydrogenase enzymes. Although algal and cyanobacterial hydrogenases perform the same enzymatic reaction through metallo-clusters, their hydrogenases have evolved separately, are expressed differently (transcription of algal hydrogenases is anaerobically induced, while bacterial hydrogenases are constitutively expressed), and display different sensitivity to O2 inactivation. Among various physiological factors, the sensitivity of hydrogenases to O2 has been one of the major factors preventing implementation of biological systems for commercial production of renewable H2. This review addresses recent strategies aimed at engineering increased O2 tolerance into hydrogenases (as of now mainly unsuccessful), as well as towards the development of methods to bypass the O2 sensitivity of hydrogenases (successful but still yielding low solar conversion efficiencies). The author concludes with a description of current approaches from various laboratories to incorporate multiple genetic traits into either algae or cyanobacteria to jointly address limiting factors other than the hydrogenase O2 sensitivity and achieve more sustained H2 photoproduction activity.
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Affiliation(s)
- Maria L Ghirardi
- National Renewable Energy Laboratory, 15013 Denver West Pkway, Golden, CO, 80401, USA,
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Rauchfuss TB. Diiron azadithiolates as models for the [FeFe]-hydrogenase active site and paradigm for the role of the second coordination sphere. Acc Chem Res 2015; 48:2107-16. [PMID: 26079848 DOI: 10.1021/acs.accounts.5b00177] [Citation(s) in RCA: 212] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The [FeFe] hydrogenases (H2ases) catalyze the redox reaction that interconverts protons and H2. This area of biocatalysis has attracted attention because the metal-based chemistry is unusual, and the reactions have practical implications. The active site consists of a [4Fe-4S] cluster bridged to a [Fe2(μ-dithiolate)(CN)2(CO)3](z) center (z = 1- and 2-). The dithiolate cofactor is [HN(CH2S)2](2-), called the azadithiolate ([adt(H)](2-)). Although many derivatives of Fe2(SR)2(CO)6-xLx are electrocatalysts for the hydrogen evolution reaction (HER), most operate by slow nonbiomimetic pathways. Biomimetic hydrogenogenesis is thought to involve intermediates, wherein the hydride substrate is adjacent to the amine of the adt(H), being bonded to only one Fe center. Formation of terminal hydride complexes is favored when the diiron carbonyl models contain azadithiolate. Although unstable in the free state, the adt cofactor is stable once it is affixed to the Fe2 center. It can be prepared by alkylation of Fe2(SH)2(CO)6 with formaldehyde in the presence of ammonia (to give adt(H) derivatives) or amines (to give adt(R) derivatives). Weak acids protonate Fe2(adt(R))(CO)2(PR3)4 to give terminal hydrido (term-H) complexes. In contrast, protonation of the related 1,3-propanedithiolate (pdt(2-)) complexes Fe2(pdt)(CO)2(PR3)4 requires strong acids. The amine in the azadithiolate is a kinetically fast base, relaying protons to and from the iron, which is a kinetically slow base. The crystal structure of the doubly protonated model [(term-H)Fe2(Hadt(H))(CO)2(dppv)2](2+) confirms the presence of both ammonium and terminal hydrido centers, which interact through a dihydrogen bond (dppv = cis-C2H2(PPh2)2). DFT calculations indicate that this H---H interaction is sensitive to the counterions and is strengthened upon reduction of the diiron center. For the monoprotonated models, the hydride [(term-H)Fe2(adt(H))(CO)2(dppv)2](+) exists in equilibrium with the ammonium tautomer [Fe2(Hadt(H))(CO)2(dppv)2](+). Both [(term-H)Fe2(Hadt(H))(CO)2(dppv)2](2+) and [(term-H)Fe2(adt(H))(CO)2(dppv)2](+) are highly active electrocatalysts for HER. Catalysis is initiated by reduction of the diferrous center, which induces coupling of the protic ammonium center and the hydride ligand. In contrast, the propanedithiolate [(term-H)Fe2(pdt)(CO)2(dppv)2](+) is a poor electrocatalyst for HER. Oxidation of H2 has been demonstrated, starting with models for the oxidized state ("Hox"), for example, [Fe2(adt(H))(CO)3(dppv)(PMe3)](+). Featuring a distorted Fe(II)Fe(I) center, this Hox model reacts slowly with high pressures of H2 to give [(μ-H)Fe2(adt(H))(CO)3(dppv)(PMe3)](+). Highlighting the role of the proton relay, the propanedithiolate [Fe2(pdt)(CO)3(dppv)(PMe3)](+) is unreactive toward H2. The Hox-model + H2 reaction is accelerated in the presence of ferrocenium salts, which simulate the role of the attached [4Fe-4S] cluster. The redox-complemented complex [Fe2(adt(Bn))(CO)3(dppv)(FcP*)](n+) catalyzes both proton reduction and hydrogen oxidation (FcP* = (C5Me5)Fe(C5Me4CH2PEt2)).
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Affiliation(s)
- Thomas B. Rauchfuss
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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48
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Morra S, Mongili B, Maurelli S, Gilardi G, Valetti F. Isolation and characterization of a new [FeFe]-hydrogenase from Clostridium perfringens. Biotechnol Appl Biochem 2015; 63:305-11. [PMID: 25851509 DOI: 10.1002/bab.1382] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 04/07/2015] [Indexed: 12/23/2022]
Abstract
This paper reports the first characterization of an [FeFe]-hydrogenase from a Clostridium perfringens strain previously isolated in our laboratory from a pilot-scale bio-hydrogen plant that efficiently produces H2 from waste biomasses. On the basis of sequence analysis, the enzyme is a monomer formed by four domains hosting various iron-sulfur centres involved in electron transfer and the catalytic center H-cluster. After recombinant expression in Escherichia coli, the purified protein catalyzes H2 evolution at high rate of 1645 ± 16 s(-1) . The optimal conditions for catalysis are in the pH range 6.5-8.0 and at the temperature of 50 °C. EPR spectroscopy showed that the H-cluster of the oxidized enzyme displays a spectrum coherent with the Hox state, whereas the CO-inhibited enzyme has a spectrum coherent with the Hox -CO state. FTIR spectroscopy showed that the purified enzyme is composed of a mixture of redox states, with a prevalence of the Hox ; upon reduction with H2 , vibrational modes assigned to the Hred state were more abundant, whereas binding of exogenous CO resulted in a spectrum assigned to the Hox -CO state. The spectroscopic features observed are similar to those of the [FeFe]-hydrogenases class, but relevant differences were observed given the different protein environment hosting the H-cluster.
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Affiliation(s)
- Simone Morra
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy
| | - Beatrice Mongili
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy
| | - Sara Maurelli
- Department of Chemistry, University of Torino, Torino, Italy
| | - Gianfranco Gilardi
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy
| | - Francesca Valetti
- Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy
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49
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Bachmeier A, Esselborn J, Hexter SV, Krämer T, Klein K, Happe T, McGrady JE, Myers WK, Armstrong FA. How Formaldehyde Inhibits Hydrogen Evolution by [FeFe]-Hydrogenases: Determination by ¹³C ENDOR of Direct Fe-C Coordination and Order of Electron and Proton Transfers. J Am Chem Soc 2015; 137:5381-9. [PMID: 25871921 DOI: 10.1021/ja513074m] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Formaldehyde (HCHO), a strong electrophile and a rapid and reversible inhibitor of hydrogen production by [FeFe]-hydrogenases, is used to identify the point in the catalytic cycle at which a highly reactive metal-hydrido species is formed. Investigations of the reaction of Chlamydomonas reinhardtii [FeFe]-hydrogenase with formaldehyde using pulsed-EPR techniques including electron-nuclear double resonance spectroscopy establish that formaldehyde binds close to the active site. Density functional theory calculations support an inhibited super-reduced state having a short Fe-(13)C bond in the 2Fe subsite. The adduct forms when HCHO is available to compete with H(+) transfer to a vacant, nucleophilic Fe site: had H(+) transfer already occurred, the reaction of HCHO with the Fe-hydrido species would lead to methanol, release of which is not detected. Instead, Fe-bound formaldehyde is a metal-hydrido mimic, a locked, inhibited form analogous to that in which two electrons and only one proton have transferred to the H-cluster. The results provide strong support for a mechanism in which the fastest pathway for H2 evolution involves two consecutive proton transfer steps to the H-cluster following transfer of a second electron to the active site.
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Affiliation(s)
- Andreas Bachmeier
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Julian Esselborn
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Suzannah V Hexter
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Tobias Krämer
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Kathrin Klein
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Thomas Happe
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - John E McGrady
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - William K Myers
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Fraser A Armstrong
- †Inorganic Chemistry Laboratory and ‡Centre for Advanced Electron Spin Resonance, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom.,§Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie and ∥Lehrstuhl für Anorganische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany
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50
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Li CG, Xue F, Cui MJ, Shang JY. Benzoate-functionalized diiron propanedithiolate complexes with mono- and di-phosphine ligands as catalysts for reduction of protons. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1026812] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Chang-Gong Li
- College of Chemistry & Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, PR China
| | - Feng Xue
- College of Chemistry & Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, PR China
| | - Mao-Jin Cui
- College of Chemistry & Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, PR China
| | - Jing-Yan Shang
- College of Chemistry & Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, PR China
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