1
|
Schaupp S, Arriaza-Gallardo FJ, Paczia N, Ataka K, Shima S. Acyl and CO Ligands in the [Fe]-Hydrogenase Cofactor Scramble upon Photolysis. Angew Chem Int Ed Engl 2024; 63:e202316478. [PMID: 38100251 DOI: 10.1002/anie.202316478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/15/2023] [Accepted: 12/15/2023] [Indexed: 12/17/2023]
Abstract
[Fe]-hydrogenase harbors the iron-guanylylpyridinol (FeGP) cofactor, in which the Fe(II) complex contains acyl-carbon, pyridinol-nitrogen, cysteine-thiolate and two CO as ligands. Irradiation with UV-A/blue light decomposes the FeGP cofactor to a 6-carboxymethyl-4-guanylyl-2-pyridone (GP) and other components. Previous in vitro biosynthesis experiments indicated that the acyl- and CO-ligands in the FeGP cofactor can scramble, but whether scrambling occurred during biosynthesis or photolysis was unclear. Here, we demonstrate that the [18 O1 -carboxy]-group of GP is incorporated into the FeGP cofactor by in vitro biosynthesis. MS/MS analysis of the 18 O-labeled FeGP cofactor revealed that the produced [18 O1 ]-acyl group is not exchanged with a CO ligand of the cofactor, indicating that the acyl and CO ligands are scrambled during photolysis rather than biosynthesis, which ruled out any biosynthesis mechanisms allowing acyl/CO ligands scrambling. Time-resolved infrared spectroscopy indicated that an acyl-Fe(CO)3 intermediate is formed during photolysis, in which scrambling of the CO and acyl ligands can occur. This finding also suggests that the light-excited FeGP cofactor has a higher affinity for external CO. These results contribute to our understanding of the biosynthesis and photosensitive properties of this unique H2 -activating natural complex.
Collapse
Affiliation(s)
- Sebastian Schaupp
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | | | - Nicole Paczia
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany)
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| |
Collapse
|
2
|
Arriaza-Gallardo FJ, Zheng YC, Gehl M, Nomura S, Fernandes-Queiroz JP, Shima S. [Fe]-Hydrogenase, Cofactor Biosynthesis and Engineering. Chembiochem 2023; 24:e202300330. [PMID: 37671838 DOI: 10.1002/cbic.202300330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 08/29/2023] [Accepted: 09/05/2023] [Indexed: 09/07/2023]
Abstract
[Fe]-hydrogenase catalyzes the heterolytic cleavage of H2 and reversible hydride transfer to methenyl-tetrahydromethanopterin. The iron-guanylylpyridinol (FeGP) cofactor is the prosthetic group of this enzyme, in which mononuclear Fe(II) is ligated with a pyridinol and two CO ligands. The pyridinol ligand fixes the iron by an acyl carbon and a pyridinol nitrogen. Biosynthetic proteins for this cofactor are encoded in the hmd co-occurring (hcg) genes. The function of HcgB, HcgC, HcgD, HcgE, and HcgF was studied by using structure-to-function analysis, which is based on the crystal structure of the proteins and subsequent enzyme assays. Recently, we reported the catalytic properties of HcgA and HcgG, novel radical S-adenosyl methionine enzymes, by using an in vitro biosynthesis assay. Here, we review the properties of [Fe]-hydrogenase and the FeGP cofactor, and the biosynthesis of the FeGP cofactor. Finally, we discuss the expected engineering of [Fe]-hydrogenase and the FeGP cofactor.
Collapse
Affiliation(s)
| | - Yu-Cong Zheng
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Manuel Gehl
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Shunsuke Nomura
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - J Pedro Fernandes-Queiroz
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| |
Collapse
|
3
|
Arriaza‐Gallardo FJ, Schaupp S, Zheng Y, Abdul‐Halim MF, Pan H, Kahnt J, Angelidou G, Paczia N, Hu X, Costa K, Shima S. The Function of Two Radical-SAM Enzymes, HcgA and HcgG, in the Biosynthesis of the [Fe]-Hydrogenase Cofactor. Angew Chem Int Ed Engl 2022; 61:e202213239. [PMID: 36264001 PMCID: PMC10100467 DOI: 10.1002/anie.202213239] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Indexed: 11/05/2022]
Abstract
In the biosynthesis of the iron-guanylylpyridinol (FeGP) cofactor, 6-carboxymethyl-5-methyl-4-hydroxy-2-pyridinol (1) is 3-methylated to form 2, then 4-guanylylated to form 3, and converted into the full cofactor. HcgA-G proteins catalyze the biosynthetic reactions. Herein, we report the function of two radical S-adenosyl methionine enzymes, HcgA and HcgG, as uncovered by in vitro complementation experiments and the use of purified enzymes. In vitro biosynthesis using the cell extract from the Methanococcus maripaludis ΔhcgA strain was complemented with HcgA or precursors 1, 2 or 3. The results suggested that HcgA catalyzes the biosynthetic reaction that forms 1. We demonstrated the formation of 1 by HcgA using the 3 kDa cell extract filtrate as the substrate. Biosynthesis in the ΔhcgG system was recovered by HcgG but not by 3, which indicated that HcgG catalyzes the reactions after the biosynthesis of 3. The data indicated that HcgG contributes to the formation of CO and completes biosynthesis of the FeGP cofactor.
Collapse
Affiliation(s)
| | - Sebastian Schaupp
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Yu‐Cong Zheng
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Mohd Farid Abdul‐Halim
- Department of Plant and Microbial BiologyUniversity of MinnesotaTwin Cities, St. PaulMinnesotaUSA
| | - Hui‐Jie Pan
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)ISIC-LSCI, BCH3305Lausanne1015Switzerland
| | - Jörg Kahnt
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Georgia Angelidou
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Nicole Paczia
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Xile Hu
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)ISIC-LSCI, BCH3305Lausanne1015Switzerland
| | - Kyle Costa
- Department of Plant and Microbial BiologyUniversity of MinnesotaTwin Cities, St. PaulMinnesotaUSA
| | - Seigo Shima
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| |
Collapse
|
4
|
Schaupp S, Arriaza‐Gallardo FJ, Pan H, Kahnt J, Angelidou G, Paczia N, Costa K, Hu X, Shima S. In Vitro Biosynthesis of the [Fe]-Hydrogenase Cofactor Verifies the Proposed Biosynthetic Precursors. Angew Chem Int Ed Engl 2022; 61:e202200994. [PMID: 35286742 PMCID: PMC9314073 DOI: 10.1002/anie.202200994] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Indexed: 02/06/2023]
Abstract
In the FeGP cofactor of [Fe]-hydrogenase, low-spin FeII is in complex with two CO ligands and a pyridinol derivative; the latter ligates the iron with a 6-acylmethyl substituent and the pyridinol nitrogen. A guanylylpyridinol derivative, 6-carboxymethyl-3,5-dimethyl-4-guanylyl-2-pyridinol (3), is produced by the decomposition of the FeGP cofactor under irradiation with UV-A/blue light and is also postulated to be a precursor of FeGP cofactor biosynthesis. HcgC and HcgB catalyze consecutive biosynthesis steps leading to 3. Here, we report an in vitro biosynthesis assay of the FeGP cofactor using the cell extract of the ΔhcgBΔhcgC strain of Methanococcus maripaludis, which does not biosynthesize 3. We chemically synthesized pyridinol precursors 1 and 2, and detected the production of the FeGP cofactor from 1, 2 and 3. These results indicated that 1, 2 and 3 are the precursors of the FeGP cofactor, and the carboxy group of 3 is converted to the acyl ligand.
Collapse
Affiliation(s)
- Sebastian Schaupp
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | | | - Hui‐jie Pan
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 33051015LausanneSwitzerland
| | - Jörg Kahnt
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Georgia Angelidou
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Nicole Paczia
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Kyle Costa
- Department of Plant and Microbial BiologyUniversity of MinnesotaTwin CitiesSt. Paul, MNUSA
| | - Xile Hu
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 33051015LausanneSwitzerland
| | - Seigo Shima
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| |
Collapse
|
5
|
Schaupp S, Arriaza‐Gallardo FJ, Pan H, Kahnt J, Angelidou G, Paczia N, Costa K, Hu X, Shima S. In Vitro Biosynthesis of the [Fe]‐Hydrogenase Cofactor Verifies the Proposed Biosynthetic Precursors. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sebastian Schaupp
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | | | - Hui‐jie Pan
- Laboratory of Inorganic Synthesis and Catalysis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 3305 1015 Lausanne Switzerland
| | - Jörg Kahnt
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Georgia Angelidou
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Nicole Paczia
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Kyle Costa
- Department of Plant and Microbial Biology University of Minnesota Twin Cities St. Paul, MN USA
| | - Xile Hu
- Laboratory of Inorganic Synthesis and Catalysis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 3305 1015 Lausanne Switzerland
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| |
Collapse
|
6
|
Crystal Structures of [Fe]-Hydrogenase from Methanolacinia paynteri Suggest a Path of the FeGP-Cofactor Incorporation Process. INORGANICS 2020. [DOI: 10.3390/inorganics8090050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
[Fe]-hydrogenase (Hmd) catalyzes the reversible heterolytic cleavage of H2, and hydride transfer to methenyl-tetrahydromethanopterin (methenyl-H4MPT+). The iron-guanylylpyridinol (FeGP) cofactor, the prosthetic group of Hmd, can be extracted from the holoenzyme and inserted back into the protein. Here, we report the crystal structure of an asymmetric homodimer of Hmd from Methanolacinia paynteri (pHmd), which was composed of one monomer in the open conformation with the FeGP cofactor (holo-form) and a second monomer in the closed conformation without the cofactor (apo-form). In addition, we report the symmetric pHmd-homodimer structure in complex with guanosine monophosphate (GMP) or guanylylpyridinol (GP), in which each ligand was bound to the protein, where the GMP moiety of the FeGP-cofactor is bound in the holo-form. Binding of GMP and GP modified the local protein structure but did not induce the open conformation. The amino-group of the Lys150 appears to interact with the 2-hydroxy group of pyridinol ring in the pHmd–GP complex, which is not the case in the structure of the pHmd–FeGP complex. Lys150Ala mutation decreased the reconstitution rate of the active enzyme with the FeGP cofactor at the physiological pH. These results suggest that Lys150 might be involved in the FeGP-cofactor incorporation into the Hmd protein in vivo.
Collapse
|
7
|
Shima S, Huang G, Wagner T, Ermler U. Structural Basis of Hydrogenotrophic Methanogenesis. Annu Rev Microbiol 2020; 74:713-733. [DOI: 10.1146/annurev-micro-011720-122807] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Most methanogenic archaea use the rudimentary hydrogenotrophic pathway—from CO2and H2to methane—as the terminal step of microbial biomass degradation in anoxic habitats. The barely exergonic process that just conserves sufficient energy for a modest lifestyle involves chemically challenging reactions catalyzed by complex enzyme machineries with unique metal-containing cofactors. The basic strategy of the methanogenic energy metabolism is to covalently bind C1species to the C1carriers methanofuran, tetrahydromethanopterin, and coenzyme M at different oxidation states. The four reduction reactions from CO2to methane involve one molybdopterin-based two-electron reduction, two coenzyme F420–based hydride transfers, and one coenzyme F430–based radical process. For energy conservation, one ion-gradient-forming methyl transfer reaction is sufficient, albeit supported by a sophisticated energy-coupling process termed flavin-based electron bifurcation for driving the endergonic CO2reduction and fixation. Here, we review the knowledge about the structure-based catalytic mechanism of each enzyme of hydrogenotrophic methanogenesis.
Collapse
Affiliation(s)
- Seigo Shima
- Max Planck Institute for Terrestrial Microbiology, 35043 Marburg, Germany
| | - Gangfeng Huang
- Max Planck Institute for Terrestrial Microbiology, 35043 Marburg, Germany
| | - Tristan Wagner
- Max Planck Institute for Marine Microbiology, 28359 Bremen, Germany
| | - Ulrich Ermler
- Max Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany
| |
Collapse
|
8
|
Fan Q, Neubauer P, Lenz O, Gimpel M. Heterologous Hydrogenase Overproduction Systems for Biotechnology-An Overview. Int J Mol Sci 2020; 21:E5890. [PMID: 32824336 PMCID: PMC7460606 DOI: 10.3390/ijms21165890] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/06/2020] [Accepted: 08/14/2020] [Indexed: 01/16/2023] Open
Abstract
Hydrogenases are complex metalloenzymes, showing tremendous potential as H2-converting redox catalysts for application in light-driven H2 production, enzymatic fuel cells and H2-driven cofactor regeneration. They catalyze the reversible oxidation of hydrogen into protons and electrons. The apo-enzymes are not active unless they are modified by a complicated post-translational maturation process that is responsible for the assembly and incorporation of the complex metal center. The catalytic center is usually easily inactivated by oxidation, and the separation and purification of the active protein is challenging. The understanding of the catalytic mechanisms progresses slowly, since the purification of the enzymes from their native hosts is often difficult, and in some case impossible. Over the past decades, only a limited number of studies report the homologous or heterologous production of high yields of hydrogenase. In this review, we emphasize recent discoveries that have greatly improved our understanding of microbial hydrogenases. We compare various heterologous hydrogenase production systems as well as in vitro hydrogenase maturation systems and discuss their perspectives for enhanced biohydrogen production. Additionally, activities of hydrogenases isolated from either recombinant organisms or in vivo/in vitro maturation approaches were systematically compared, and future perspectives for this research area are discussed.
Collapse
Affiliation(s)
- Qin Fan
- Institute of Biotechnology, Technical University of Berlin, Ackerstraße 76, 13355 Berlin, Germany; (Q.F.); (P.N.)
| | - Peter Neubauer
- Institute of Biotechnology, Technical University of Berlin, Ackerstraße 76, 13355 Berlin, Germany; (Q.F.); (P.N.)
| | - Oliver Lenz
- Department of Chemistry, Technical University of Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany;
| | - Matthias Gimpel
- Institute of Biotechnology, Technical University of Berlin, Ackerstraße 76, 13355 Berlin, Germany; (Q.F.); (P.N.)
| |
Collapse
|
9
|
Methanogenesis involves direct hydride transfer from H2 to an organic substrate. Nat Rev Chem 2020; 4:213-221. [PMID: 37128042 DOI: 10.1038/s41570-020-0167-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/27/2020] [Indexed: 01/02/2023]
Abstract
Certain anaerobic microorganisms evolved a mechanism to use H2 as a reductant in their energy metabolisms. For these purposes, the microorganisms developed H2-activating enzymes, which are aspirational catalysts in a sustainable hydrogen economy. In the case of the hydrogenotrophic pathway performed by methanogenic archaea, 8e- are extracted from 4H2 and used as reducing equivalents to convert CO2 into CH4. Under standard cultivation conditions, these archaea express [NiFe]-hydrogenases, which are Ni-dependent and Fe-dependent enzymes and heterolytically cleave H2 into 2H+ and 2e-, the latter being supplied into the central metabolism. Under Ni-limiting conditions, F420-reducing [NiFe]-hydrogenases are downregulated and their functions are predominantly taken over by an upregulated [Fe]-hydrogenase. Unique in biology, this Fe-dependent hydrogenase cleaves H2 and directly transfers H- to an imidazolium-containing substrate. [Fe]-hydrogenase activates H2 at an Fe cofactor ligated by two CO molecules, an acyl group, a pyridinol N atom and a cysteine thiolate as the central constituent. This Fe centre has inspired chemists to not only design synthetic mimics to catalytically cleave H2 in solution but also for incorporation into apo-[Fe]-hydrogenase to give semi-synthetic proteins. This Perspective describes the enzymes involved in hydrogenotrophic methanogenesis, with a focus on those performing the reduction steps. Of these, we describe [Fe]-hydrogenases in detail and cover recent progress in their synthetic modelling.
Collapse
|
10
|
Albina P, Durban N, Bertron A, Albrecht A, Robinet JC, Erable B. Influence of Hydrogen Electron Donor, Alkaline pH, and High Nitrate Concentrations on Microbial Denitrification: A Review. Int J Mol Sci 2019; 20:ijms20205163. [PMID: 31635215 PMCID: PMC6834205 DOI: 10.3390/ijms20205163] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 10/02/2019] [Accepted: 10/15/2019] [Indexed: 12/25/2022] Open
Abstract
Bacterial respiration of nitrate is a natural process of nitrate reduction, which has been industrialized to treat anthropic nitrate pollution. This process, also known as “microbial denitrification”, is widely documented from the fundamental and engineering points of view for the enhancement of the removal of nitrate in wastewater. For this purpose, experiments are generally conducted with heterotrophic microbial metabolism, neutral pH and moderate nitrate concentrations (<50 mM). The present review focuses on a different approach as it aims to understand the effects of hydrogenotrophy, alkaline pH and high nitrate concentration on microbial denitrification. Hydrogen has a high energy content but its low solubility, 0.74 mM (1 atm, 30 °C), in aqueous medium limits its bioavailability, putting it at a kinetic disadvantage compared to more soluble organic compounds. For most bacteria, the optimal pH varies between 7.5 and 9.5. Outside this range, denitrification is slowed down and nitrite (NO2−) accumulates. Some alkaliphilic bacteria are able to express denitrifying activity at pH levels close to 12 thanks to specific adaptation and resistance mechanisms detailed in this manuscript, and some bacterial populations support nitrate concentrations in the range of several hundred mM to 1 M. A high concentration of nitrate generally leads to an accumulation of nitrite. Nitrite accumulation can inhibit bacterial activity and may be a cause of cell death.
Collapse
Affiliation(s)
- Pierre Albina
- Laboratoire Matériaux et Durabilité des Constructions, Université de Toulouse, UPS, INSA. 135, 7 avenue de Rangueil, 31077 Toulouse CEDEX 04, France.
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 31030 Toulouse, France.
| | - Nadège Durban
- Laboratoire Matériaux et Durabilité des Constructions, Université de Toulouse, UPS, INSA. 135, 7 avenue de Rangueil, 31077 Toulouse CEDEX 04, France.
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 31030 Toulouse, France.
| | - Alexandra Bertron
- Laboratoire Matériaux et Durabilité des Constructions, Université de Toulouse, UPS, INSA. 135, 7 avenue de Rangueil, 31077 Toulouse CEDEX 04, France.
| | - Achim Albrecht
- Andra (Agence nationale pour la gestion des déchets radioactifs), 92298 Châtenay-Malabry, France.
| | - Jean-Charles Robinet
- Andra (Agence nationale pour la gestion des déchets radioactifs), 92298 Châtenay-Malabry, France.
| | - Benjamin Erable
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 31030 Toulouse, France.
| |
Collapse
|
11
|
Borthakur B, Phukan AK. Can carbene decorated [FeFe]-hydrogenase model complexes catalytically produce dihydrogen? An insight from theory. Dalton Trans 2019; 48:11298-11307. [PMID: 31270518 DOI: 10.1039/c9dt01855g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclic alkyl amino carbene (CAAC) anchored [FeFe]-hydrogenase model complex featuring rotated conformation at one of the iron centers are found to be promising candidate for effective production of dihydrogen. A stepwise comparison of the complete mechanism using the CAAC stabilized model complex [1]0 has been performed with that of an experimentally isolated one ([2]0). Interestingly, the reduction events involved in the catalytic cycles are found to be more favorable than those previously reported for a similar experimentally known system. Furthermore, the computed ΔpKa values indicate that the distal iron center with a vacant coordination site is more basic compared to the amino nitrogen atom of the azadithiolate bridge. We also made an attempt to determine the oxidation states of the iron centers for the intermediates involved in the catalytic cycles on the basis of the computed Mössbauer isomer shift and Mulliken spin density values.
Collapse
Affiliation(s)
- Bitupon Borthakur
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Assam, India.
| | - Ashwini K Phukan
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Assam, India.
| |
Collapse
|
12
|
|
13
|
Borthakur B, Vargas A, Phukan AK. A Computational Study of Carbene Ligand Stabilization of Biomimetic Models of the Rotated H
red
State of [FeFe]‐Hydrogenase. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Bitupon Borthakur
- Department of Chemical Sciences Tezpur University Napaam 784028 Assam India
| | - Alfredo Vargas
- Department of Chemistry, School of Life Sciences University of Sussex Brighton BN1 9QJ Sussex United Kingdom
| | - Ashwini K. Phukan
- Department of Chemical Sciences Tezpur University Napaam 784028 Assam India
| |
Collapse
|
14
|
Watanabe T, Wagner T, Huang G, Kahnt J, Ataka K, Ermler U, Shima S. The Bacterial [Fe]-Hydrogenase Paralog HmdII Uses Tetrahydrofolate Derivatives as Substrates. Angew Chem Int Ed Engl 2019; 58:3506-3510. [PMID: 30600878 DOI: 10.1002/anie.201813465] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Indexed: 11/11/2022]
Abstract
[Fe]-hydrogenase (Hmd) catalyzes the reversible hydrogenation of methenyl-tetrahydromethanopterin (methenyl-H4 MPT+ ) with H2 . H4 MPT is a C1-carrier of methanogenic archaea. One bacterial genus, Desulfurobacterium, contains putative genes for the Hmd paralog, termed HmdII, and the HcgA-G proteins. The latter are required for the biosynthesis of the prosthetic group of Hmd, the iron-guanylylpyridinol (FeGP) cofactor. This finding is intriguing because Hmd and HmdII strictly use H4 MPT derivatives that are absent in most bacteria. We identified the presence of the FeGP cofactor in D. thermolithotrophum. The bacterial HmdII reconstituted with the FeGP cofactor catalyzed the hydrogenation of derivatives of tetrahydrofolate, the bacterial C1-carrier, albeit with low enzymatic activities. The crystal structures show how Hmd recognizes tetrahydrofolate derivatives. These findings have an impact on future biotechnology by identifying a bacterial Hmd paralog.
Collapse
Affiliation(s)
- Tomohiro Watanabe
- Microbial Protein Structure Group, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| | - Tristan Wagner
- Microbial Protein Structure Group, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany.,Current address: Microbial Metabolism group, Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, 28359, Bremen, Germany
| | - Gangfeng Huang
- Microbial Protein Structure Group, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| | - Jörg Kahnt
- Mass Spectrometry and Proteomics Unit, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, 14195, Berlin, Germany
| | - Ulrich Ermler
- Department of Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, 60438, Frankfurt/Main, Germany
| | - Seigo Shima
- Microbial Protein Structure Group, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| |
Collapse
|
15
|
Watanabe T, Wagner T, Huang G, Kahnt J, Ataka K, Ermler U, Shima S. The Bacterial [Fe]-Hydrogenase Paralog HmdII Uses Tetrahydrofolate Derivatives as Substrates. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tomohiro Watanabe
- Microbial Protein Structure Group; Max Planck Institute for Terrestrial Microbiology; Karl-von-Frisch Straße 10 35043 Marburg Germany
| | - Tristan Wagner
- Microbial Protein Structure Group; Max Planck Institute for Terrestrial Microbiology; Karl-von-Frisch Straße 10 35043 Marburg Germany
- Current address: Microbial Metabolism group; Max Planck Institute for Marine Microbiology; Celsiusstrasse 1 28359 Bremen Germany
| | - Gangfeng Huang
- Microbial Protein Structure Group; Max Planck Institute for Terrestrial Microbiology; Karl-von-Frisch Straße 10 35043 Marburg Germany
| | - Jörg Kahnt
- Mass Spectrometry and Proteomics Unit; Max Planck Institute for Terrestrial Microbiology; Karl-von-Frisch Straße 10 35043 Marburg Germany
| | - Kenichi Ataka
- Department of Physics; Freie Universität Berlin; 14195 Berlin Germany
| | - Ulrich Ermler
- Department of Max-Planck-Institut für Biophysik; Max-von-Laue-Straße 3 60438 Frankfurt/Main Germany
| | - Seigo Shima
- Microbial Protein Structure Group; Max Planck Institute for Terrestrial Microbiology; Karl-von-Frisch Straße 10 35043 Marburg Germany
| |
Collapse
|
16
|
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.
Collapse
|
17
|
Wagner T, Huang G, Ermler U, Shima S. How [Fe]-Hydrogenase from Methanothermobacter is Protected Against Light and Oxidative Stress. Angew Chem Int Ed Engl 2018; 57:15056-15059. [PMID: 30207625 DOI: 10.1002/anie.201807203] [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: 06/22/2018] [Revised: 08/24/2018] [Indexed: 11/09/2022]
Abstract
[Fe]-hydrogenase (Hmd) catalyzes the reversible hydrogenation of methenyltetrahydromethanopterin (methenyl-H4 MPT+ ) with H2 . Hmd contains the iron-guanylylpyridinol (FeGP) cofactor, which is sensitive to light and oxidative stress. A natural protection mechanism is reported for Hmd based on structural and biophysical data. Hmd from Methanothermobacter marburgensis (mHmd) was found in a hexameric state, where an expanded oligomerization loop is detached from the dimer core and intrudes into the active site of a neighboring dimer. An aspartic acid residue from the loop ligates to FeII of the FeGP cofactor and thus blocks the postulated H2 -binding site. In solution, this enzyme is in a hexamer-to-dimer equilibrium. Lower enzyme concentrations, and the presence of methenyl-H4 MPT+ , shift the equilibrium toward the active dimer side. At higher enzyme concentrations-as present in the cell-the enzyme is predominantly in the inactive hexameric state and is thereby protected against light and oxidative stress.
Collapse
Affiliation(s)
- Tristan Wagner
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| | - Gangfeng Huang
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, 60438, Frankfurt/Main, Germany
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Straße 10, 35043, Marburg, Germany
| |
Collapse
|
18
|
Wagner T, Huang G, Ermler U, Shima S. How [Fe]‐Hydrogenase from
Methanothermobacter
is Protected Against Light and Oxidative Stress. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tristan Wagner
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch Straße 10 35043 Marburg Germany
| | - Gangfeng Huang
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch Straße 10 35043 Marburg Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik Max-von-Laue-Straße 3 60438 Frankfurt/Main Germany
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch Straße 10 35043 Marburg Germany
| |
Collapse
|
19
|
Huang G, Wagner T, Ermler U, Bill E, Ataka K, Shima S. Dioxygen Sensitivity of [Fe]-Hydrogenase in the Presence of Reducing Substrates. Angew Chem Int Ed Engl 2018; 57:4917-4920. [PMID: 29462510 DOI: 10.1002/anie.201712293] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Indexed: 01/27/2023]
Abstract
Mono-iron hydrogenase ([Fe]-hydrogenase) reversibly catalyzes the transfer of a hydride ion from H2 to methenyltetrahydromethanopterin (methenyl-H4 MPT+ ) to form methylene-H4 MPT. Its iron guanylylpyridinol (FeGP) cofactor plays a key role in H2 activation. Evidence is presented for O2 sensitivity of [Fe]-hydrogenase under turnover conditions in the presence of reducing substrates, methylene-H4 MPT or methenyl-H4 MPT+ /H2 . Only then, H2 O2 is generated, which decomposes the FeGP cofactor; as demonstrated by spectroscopic analyses and the crystal structure of the deactivated enzyme. O2 reduction to H2 O2 requires a reductant, which can be a catalytic intermediate transiently formed during the [Fe]-hydrogenase reaction. The most probable candidate is an iron hydride species; its presence has already been predicted by theoretical studies of the catalytic reaction. The findings support predictions because the same type of reduction reaction is described for ruthenium hydride complexes that hydrogenate polar compounds.
Collapse
Affiliation(s)
- Gangfeng Huang
- Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Tristan Wagner
- Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, 60438, Frankfurt/Main, Germany
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion, 45470, Mülheim, Germany
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, Berlin, 14195, Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| |
Collapse
|
20
|
Huang G, Wagner T, Ermler U, Bill E, Ataka K, Shima S. Dioxygen Sensitivity of [Fe]-Hydrogenase in the Presence of Reducing Substrates. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712293] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Gangfeng Huang
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Tristan Wagner
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik; Max-von-Laue-Straße 3 60438 Frankfurt/Main Germany
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion; 45470 Mülheim Germany
| | - Kenichi Ataka
- Department of Physics; Freie Universität Berlin; Berlin 14195 Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| |
Collapse
|
21
|
Bai L, Wagner T, Xu T, Hu X, Ermler U, Shima S. A Water-Bridged H-Bonding Network Contributes to the Catalysis of the SAM-Dependent C-Methyltransferase HcgC. Angew Chem Int Ed Engl 2017; 56:10806-10809. [DOI: 10.1002/anie.201705605] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Indexed: 01/31/2023]
Affiliation(s)
- Liping Bai
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Tristan Wagner
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Tao Xu
- Institute of Chemical Science and Engineering; Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, BCH 3305; 1015 Lausanne Switzerland
| | - Xile Hu
- Institute of Chemical Science and Engineering; Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, BCH 3305; 1015 Lausanne Switzerland
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik; Max-von-Laue-Straße 3 60438 Frankfurt/Main Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| |
Collapse
|
22
|
Bai L, Wagner T, Xu T, Hu X, Ermler U, Shima S. A Water-Bridged H-Bonding Network Contributes to the Catalysis of the SAM-Dependent C-Methyltransferase HcgC. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705605] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Liping Bai
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Tristan Wagner
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Tao Xu
- Institute of Chemical Science and Engineering; Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, BCH 3305; 1015 Lausanne Switzerland
| | - Xile Hu
- Institute of Chemical Science and Engineering; Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, BCH 3305; 1015 Lausanne Switzerland
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik; Max-von-Laue-Straße 3 60438 Frankfurt/Main Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| |
Collapse
|
23
|
Zha GJ. Spin-forbidden CO binding to iron–sulfur cluster-free hydrogenase: A density functional study. J STRUCT CHEM+ 2017. [DOI: 10.1134/s0022476617020160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
24
|
Xie ZL, Durgaprasad G, Ali AK, Rose MJ. Substitution reactions of iron(ii) carbamoyl-thioether complexes related to mono-iron hydrogenase. Dalton Trans 2017; 46:10814-10829. [DOI: 10.1039/c7dt01696d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A C,N,S pincer complex has been synthesized for structural modeling of the organometallic active site of mono-[Fe] hydrogenase (HMD).
Collapse
Affiliation(s)
- Zhu-Lin Xie
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | | | - Azim K. Ali
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | - Michael J. Rose
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| |
Collapse
|
25
|
Bai L, Fujishiro T, Huang G, Koch J, Takabayashi A, Yokono M, Tanaka A, Xu T, Hu X, Ermler U, Shima S. Towards artificial methanogenesis: biosynthesis of the [Fe]-hydrogenase cofactor and characterization of the semi-synthetic hydrogenase. Faraday Discuss 2017; 198:37-58. [DOI: 10.1039/c6fd00209a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The greenhouse gas and energy carrier methane is produced on Earth mainly by methanogenic archaea. In the hydrogenotrophic methanogenic pathway the reduction of one CO2 to one methane molecule requires four molecules of H2 containing eight electrons. Four of the electrons from two H2 are supplied for reduction of an electron carrier F420, which is catalyzed by F420-reducing [NiFe]-hydrogenase under nickel-sufficient conditions. The same reaction is catalysed under nickel-limiting conditions by [Fe]-hydrogenase coupled with a reaction catalyzed by F420-dependent methylene tetrahydromethanopterin dehydrogenase. [Fe]-hydrogenase contains an iron-guanylylpyridinol (FeGP) cofactor for H2 activation at the active site. FeII of FeGP is coordinated to a pyridinol-nitrogen, an acyl-carbon, two CO and a cysteine-thiolate. We report here on comparative genomic analyses of biosynthetic genes of the FeGP cofactor, which are primarily located in a hmd-co-occurring (hcg) gene cluster. One of the gene products is HcgB which transfers the guanosine monophosphate (GMP) moiety from guanosine triphosphate (GTP) to a pyridinol precursor. Crystal structure analysis of HcgB from Methanococcus maripaludis and its complex with 6-carboxymethyl-3,5-dimethyl-4-hydroxy-2-pyridinol confirmed the physiological guanylyltransferase reaction. Furthermore, we tested the properties of semi-synthetic [Fe]-hydrogenases using the [Fe]-hydrogenase apoenzyme from several methanogenic archaea and a mimic of the FeGP cofactor. On the basis of the enzymatic reactions involved in the methanogenic pathway, we came up with an idea how the methanogenic pathway could be simplified to develop an artificial methanogenesis system.
Collapse
Affiliation(s)
- Liping Bai
- Max-Planck-Institut für terrestrische Mikrobiologie
- 35043 Marburg
- Germany
| | - Takashi Fujishiro
- Max-Planck-Institut für terrestrische Mikrobiologie
- 35043 Marburg
- Germany
| | - Gangfeng Huang
- Max-Planck-Institut für terrestrische Mikrobiologie
- 35043 Marburg
- Germany
| | - Jürgen Koch
- Max-Planck-Institut für terrestrische Mikrobiologie
- 35043 Marburg
- Germany
| | - Atsushi Takabayashi
- The Institute of Low Temperature Science
- Hokkaido University
- Sapporo 060-0819
- Japan
| | - Makio Yokono
- The Institute of Low Temperature Science
- Hokkaido University
- Sapporo 060-0819
- Japan
| | - Ayumi Tanaka
- The Institute of Low Temperature Science
- Hokkaido University
- Sapporo 060-0819
- Japan
| | - Tao Xu
- Institute of Chemical Science and Engineering
- Ecole Polytechnique Fédérale de Lausanne (EPFL)
- 1015 Lausanne
- Switzerland
| | - Xile Hu
- Institute of Chemical Science and Engineering
- Ecole Polytechnique Fédérale de Lausanne (EPFL)
- 1015 Lausanne
- Switzerland
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik
- 60438 Frankfurt/Main
- Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie
- 35043 Marburg
- Germany
- PRESTO
- Japan, Science and Technology Agency (JST)
| |
Collapse
|
26
|
Shea MT, Walter ME, Duszenko N, Ducluzeau AL, Aldridge J, King SK, Buan NR. pNEB193-derived suicide plasmids for gene deletion and protein expression in the methane-producing archaeon, Methanosarcina acetivorans. Plasmid 2016; 84-85:27-35. [PMID: 26876941 DOI: 10.1016/j.plasmid.2016.02.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 02/10/2016] [Accepted: 02/10/2016] [Indexed: 10/22/2022]
Abstract
Gene deletion and protein expression are cornerstone procedures for studying metabolism in any organism, including methane-producing archaea (methanogens). Methanogens produce coenzymes and cofactors not found in most bacteria, therefore it is sometimes necessary to express and purify methanogen proteins from the natural host. Protein expression in the native organism is also useful when studying post-translational modifications and their effect on gene expression or enzyme activity. We have created several new suicide plasmids to complement existing genetic tools for use in the methanogen, Methanosarcina acetivorans. The new plasmids are derived from the commercially available Escherichia coli plasmid, pNEB193, and cannot replicate autonomously in methanogens. The designed plasmids facilitate markerless gene deletion, gene transcription, protein expression, and purification of proteins with cleavable affinity tags from the methanogen, M. acetivorans.
Collapse
Affiliation(s)
- Mitchell T Shea
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Mary E Walter
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Nikolas Duszenko
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Anne-Lise Ducluzeau
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Jared Aldridge
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Shannon K King
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Nicole R Buan
- Redox Biology Center, Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, United States.
| |
Collapse
|
27
|
Shima S, Chen D, Xu T, Wodrich MD, Fujishiro T, Schultz KM, Kahnt J, Ataka K, Hu X. Reconstitution of [Fe]-hydrogenase using model complexes. Nat Chem 2015; 7:995-1002. [DOI: 10.1038/nchem.2382] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 09/23/2015] [Indexed: 11/09/2022]
|
28
|
Hidese R, Ataka K, Bill E, Shima S. Cu I and H 2 O 2 Inactivate and Fe II Inhibits [Fe]-Hydrogenase at Very Low Concentrations. Chembiochem 2015; 16:1861-1865. [PMID: 26136368 DOI: 10.1002/cbic.201500318] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Indexed: 11/09/2022]
Abstract
[Fe]-Hydrogenase (Hmd) catalyzes reversible hydride transfer from H2 . It harbors an iron-guanylylpyridinol as a cofactor with an FeII that is ligated to one thiolate, two COs, one acyl-C, one pyridinol-N, and solvent. Here, we report that CuI and H2 O2 inactivate Hmd (half-maximal rates at 1 μM CuI and 20 μM H2 O2 ) and that FeII inhibits the enzyme with very high affinity (Ki =40 nM). Infrared and EPR studies together with competitive inhibition studies with isocyanide indicated that CuI exerts its inhibitory effect most probably by binding to the active site iron-thiolate ligand. Using the same methods, it was found that H2 O2 binds to the active-site iron at the solvent-binding site and oxidizes FeII to FeIII . Also it was shown that FeII reversibly binds away from the active site iron, with binding being competitive to the organic hydride acceptor; this inhibition is specific for FeII and is reminiscent of that for the [FeFe]-hydrogenase second iron, which specifically interacts with H2 .
Collapse
Affiliation(s)
- Ryota Hidese
- Max-Planck-Institute für terrestrische Mikrobiologie, Karl-von-Frisch-Strasse 10, 35043 Marburg (Germany)
| | - Kenichi Ataka
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany)
| | - Eckhard Bill
- Max Planck Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr (Germany)
| | - Seigo Shima
- Max-Planck-Institute für terrestrische Mikrobiologie, Karl-von-Frisch-Strasse 10, 35043 Marburg (Germany).,PRESTO, Japan Science and Technology Agency (JST), Saitama 332-0012 (Japan)
| |
Collapse
|
29
|
Najafian S, Zahedifar M. Antioxidant activity and essential oil composition of Satureja hortensis L. as influenced by sulfur fertilizer. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2015; 95:2404-8. [PMID: 25315247 DOI: 10.1002/jsfa.6959] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Revised: 09/25/2014] [Accepted: 10/12/2014] [Indexed: 05/27/2023]
Abstract
BACKGROUND The quantity and quality of essential oils in plants can be influenced by various factors, including genetic traits, agricultural practices and environmental conditions such as nutrient availability. Macronutrients such as sulfur (S) are among the major factors influencing plant growth and development. Therefore this study was carried out to determine the effect of S fertilization at three levels (0, 0.05 and 0.1 g S kg(-1) soil) on the essential oil composition and antioxidant activity of Satureja hortensis L. RESULTS Application of 0.05 g S kg(-1) soil increased the levels of α-terpinene, p-cymene, myrcene, α-thujene and α-pinene but decreased the level of γ-terpinene in the essential oil. This S application was most suitable for obtaining higher proportions of α-terpinene, p-cymene, myrcene, α-thujene and α-pinene, while application of 0.1 g S kg(-1) soil was preferable for carvacrol. γ-Terpinene was most abundant in the control. All extracts showed a considerable DPPH-inhibitory effect, with IC50 ranging from 0.720 g L(-1) in the control to 0.363 g L(-1) with application of 0.1 g S kg(-1) soil. The maximum antioxidant effect was observed with application of 0.1 g S kg(-1) soil. CONCLUSION The results revealed that the use of chemical fertilizers such as S could improve the antioxidant activity of plant extracts significantly. Studying the secondary plant metabolites, mainly essential oils, is an interesting research area, so further studies are recommended to determine the effect of chemical fertilizers on the composition and antioxidant activity of essential oils of other aromatic plants.
Collapse
Affiliation(s)
- Sharareh Najafian
- Department of Agriculture, Payame Noor University, PO Box 19395-3697, Tehran, Iran
| | - Maryam Zahedifar
- Department of Rangeland and Watershed Management, College of Agriculture and Natural Resources, Fasa University, Fasa, Iran
| |
Collapse
|
30
|
Li C, Fu Z, Zhang X, Liu Y, Wang Y. Theoretical study of iron acyl complexes modeling the active site of [Fe]-hydrogenase: Solvation effects play a significant role. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.04.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
31
|
Fujishiro T, Ataka K, Ermler U, Shima S. Towards a functional identification of catalytically inactive [Fe]-hydrogenase paralogs. FEBS J 2015; 282:3412-23. [PMID: 26094576 DOI: 10.1111/febs.13351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 06/15/2015] [Accepted: 06/17/2015] [Indexed: 11/29/2022]
Abstract
UNLABELLED [Fe]-hydrogenase (Hmd), an enzyme of the methanogenic energy metabolism, harbors an iron-guanylylpyridinol (FeGP) cofactor used for H2 cleavage. The generated hydride is transferred to methenyl-tetrahydromethanopterin (methenyl-H4MPT(+)). Most hydrogenotrophic methanogens contain the hmd-related genes hmdII and hmdIII. Their function is still elusive. We were able to reconstitute the HmdII holoenzyme of Methanocaldococcus jannaschii with recombinantly produced apoenzyme and the FeGP cofactor, which is a prerequisite for in vitro functional analysis. Infrared spectroscopic and X-ray structural data clearly indicated binding of the FeGP cofactor. Methylene-H4MPT binding was detectable in the significantly altered infrared spectra of the HmdII holoenzyme and in the HmdII apoenzyme-methylene-H4 MPT complex structure. The related binding mode of the FeGP cofactor and methenyl-H4MPT(+) compared with Hmd and their multiple contacts to the polypeptide highly suggest a biological role in HmdII. However, holo-HmdII did not catalyze the Hmd reaction, not even in a single turnover process, as demonstrated by kinetic measurements. The found inactivity can be rationalized by an increased contact area between the C- and N-terminal folding units in HmdII compared with in Hmd, which impairs the catalytically necessary open-to-close transition, and by an exchange of a crucial histidine to a tyrosine. Mainly based on the presented data, a function of HmdII as Hmd isoenzyme, H2 sensor, FeGP-cofactor storage protein and scaffold protein for FeGP-cofactor biosynthesis could be excluded. Inspired by the recently found binding of HmdII to aminoacyl-tRNA synthetases and tRNA, we tentatively consider HmdII as a regulatory protein for protein synthesis that senses the intracellular methylene-H4 MPT concentration. DATABASE Structural data are available in the Protein Data Bank under the accession numbers 4YT8; 4YT2; 4YT4 and 4YT5.
Collapse
Affiliation(s)
- Takashi Fujishiro
- Max-Planck-Institut für terrestrische Mikrobiologie, Marburg, Germany
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Frankfurt/Main, Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie, Marburg, Germany.,PRESTO, Japan Science and Technology Agency (JST), Saitama, Japan
| |
Collapse
|
32
|
Tsygankov AA, Khusnutdinova AN. Hydrogen in metabolism of purple bacteria and prospects of practical application. Microbiology (Reading) 2015. [DOI: 10.1134/s0026261715010154] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
33
|
Murray KA, Wodrich MD, Hu X, Corminboeuf C. Toward functional type III [Fe]-hydrogenase biomimics for H2 activation: insights from computation. Chemistry 2015; 21:3987-96. [PMID: 25649221 DOI: 10.1002/chem.201405619] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Indexed: 11/06/2022]
Abstract
The chemistry of [Fe]-hydrogenase has attracted significant interest due to its ability to activate molecular hydrogen. The intriguing properties of this enzyme have prompted the synthesis of numerous small molecule mimics aimed at activating H2. Despite considerable effort, a majority of these compounds remain nonfunctional for hydrogenation reactions. By using a recently synthesized model as an entry point, seven biomimetic complexes have been examined through DFT computations to probe the influence of ligand environment on the ability of a mimic to bind and split H2. One mimic, featuring a bidentate diphosphine group incorporating an internal nitrogen base, was found to have particularly attractive energetics, prompting a study of the role played by the proton/hydride acceptor necessary to complete the catalytic cycle. Computations revealed an experimentally accessible energetic pathway involving a benzaldehyde proton/hydride acceptor and the most promising catalyst.
Collapse
Affiliation(s)
- Kevin A Murray
- Laboratory for Computational Molecular Design, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland)
| | | | | | | |
Collapse
|
34
|
A novel CO-responsive transcriptional regulator and enhanced H2 production by an engineered Thermococcus onnurineus NA1 strain. Appl Environ Microbiol 2014; 81:1708-14. [PMID: 25548050 DOI: 10.1128/aem.03019-14] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Genome analysis revealed the existence of a putative transcriptional regulatory system governing CO metabolism in Thermococcus onnurineus NA1, a carboxydotrophic hydrogenogenic archaeon. The regulatory system is composed of CorQ with a 4-vinyl reductase domain and CorR with a DNA-binding domain of the LysR-type transcriptional regulator family in close proximity to the CO dehydrogenase (CODH) gene cluster. Homologous genes of the CorQR pair were also found in the genomes of Thermococcus species and "Candidatus Korarchaeum cryptofilum" OPF8. In-frame deletion of either corQ or corR caused a severe impairment in CO-dependent growth and H2 production. When corQ and corR deletion mutants were complemented by introducing the corQR genes under the control of a strong promoter, the mRNA and protein levels of the CODH gene were significantly increased in a ΔCorR strain complemented with integrated corQR (ΔCorR/corQR(↑)) compared with those in the wild-type strain. In addition, the ΔCorR/corQR(↑) strain exhibited a much higher H2 production rate (5.8-fold) than the wild-type strain in a bioreactor culture. The H2 production rate (191.9 mmol liter(-1) h(-1)) and the specific H2 production rate (249.6 mmol g(-1) h(-1)) of this strain were extremely high compared with those of CO-dependent H2-producing prokaryotes reported so far. These results suggest that the corQR genes encode a positive regulatory protein pair for the expression of a CODH gene cluster. The study also illustrates that manipulation of the transcriptional regulatory system can improve biological H2 production.
Collapse
|
35
|
Byer AS, Shepard EM, Peters JW, Broderick JB. Radical S-adenosyl-L-methionine chemistry in the synthesis of hydrogenase and nitrogenase metal cofactors. J Biol Chem 2014; 290:3987-94. [PMID: 25477518 DOI: 10.1074/jbc.r114.578161] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Nitrogenase, [FeFe]-hydrogenase, and [Fe]-hydrogenase enzymes perform catalysis at metal cofactors with biologically unusual non-protein ligands. The FeMo cofactor of nitrogenase has a MoFe7S9 cluster with a central carbon, whereas the H-cluster of [FeFe]-hydrogenase contains a 2Fe subcluster coordinated by cyanide and CO ligands as well as dithiomethylamine; the [Fe]-hydrogenase cofactor has CO and guanylylpyridinol ligands at a mononuclear iron site. Intriguingly, radical S-adenosyl-L-methionine enzymes are vital for the assembly of all three of these diverse cofactors. This minireview presents and discusses the current state of knowledge of the radical S-adenosylmethionine enzymes required for synthesis of these remarkable metal cofactors.
Collapse
Affiliation(s)
- Amanda S Byer
- From the Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - Eric M Shepard
- From the Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - John W Peters
- From the Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - Joan B Broderick
- From the Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| |
Collapse
|
36
|
|
37
|
Affiliation(s)
- Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Hideaki Ogata
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Olaf Rüdiger
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Edward Reijerse
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| |
Collapse
|
38
|
Tamura H, Salomone-Stagni M, Fujishiro T, Warkentin E, Meyer-Klaucke W, Ermler U, Shima S. Crystal Structures of [Fe]-Hydrogenase in Complex with Inhibitory Isocyanides: Implications for the H2-Activation Site. Angew Chem Int Ed Engl 2013; 52:9656-9. [DOI: 10.1002/anie.201305089] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Indexed: 01/08/2023]
|
39
|
Crystal Structures of [Fe]-Hydrogenase in Complex with Inhibitory Isocyanides: Implications for the H2-Activation Site. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305089] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
40
|
Lie TJ, Costa KC, Pak D, Sakesan V, Leigh JA. Phenotypic evidence that the function of the [Fe]-hydrogenase Hmd inMethanococcus maripaludisrequires sevenhcg(hmdco-occurring genes) but nothmdII. FEMS Microbiol Lett 2013; 343:156-60. [DOI: 10.1111/1574-6968.12141] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 03/21/2013] [Accepted: 03/22/2013] [Indexed: 11/28/2022] Open
Affiliation(s)
- Thomas J. Lie
- Department of Microbiology; University of Washington; Seattle; WA; USA
| | - Kyle C. Costa
- Department of Microbiology; University of Washington; Seattle; WA; USA
| | - Daniel Pak
- Department of Microbiology; University of Washington; Seattle; WA; USA
| | - Varun Sakesan
- Department of Microbiology; University of Washington; Seattle; WA; USA
| | - John A. Leigh
- Department of Microbiology; University of Washington; Seattle; WA; USA
| |
Collapse
|
41
|
Schultz KM, Chen D, Hu X. [Fe]-Hydrogenase and Models that Contain IronAcyl Ligation. Chem Asian J 2013; 8:1068-75. [DOI: 10.1002/asia.201300232] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Indexed: 11/06/2022]
|
42
|
Wodrich MD, Hu X. Electronic Elements Governing the Binding of Small Molecules to a [Fe]-Hydrogenase Mimic. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300081] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
43
|
|
44
|
Oza JP, Sowers KR, Perona JJ. Linking energy production and protein synthesis in hydrogenotrophic methanogens. Biochemistry 2012; 51:2378-89. [PMID: 22401293 DOI: 10.1021/bi300106p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydrogenotrophic methanogens possessing the hydrogen-dependent dehydrogenase Hmd also encode paralogs of this protein whose function is poorly understood. Here we present biochemical evidence that the two inactive Hmd paralogs of Methanocaldococcus jannaschii, HmdII and HmdIII, form binary and ternary complexes with several components of the protein translation apparatus. HmdII and HmdIII, but not the active dehydrogenase Hmd, bind with micromolar binding affinities to a number of tRNAs and form ternary complexes with tRNA(Pro) and prolyl-tRNA synthetase (ProRS). Fluorescence spectroscopy experiments also suggest that binding of HmdII and ProRS involves distinct binding determinants on the tRNA. These biochemical data suggest the possibility of a regulatory link between energy production and protein translation pathways that may allow a rapid cellular response to altered environmental conditions.
Collapse
Affiliation(s)
- Javin P Oza
- Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara, Santa Barbara, California 93106-9510, United States
| | | | | |
Collapse
|
45
|
Schick M, Xie X, Ataka K, Kahnt J, Linne U, Shima S. Biosynthesis of the Iron-Guanylylpyridinol Cofactor of [Fe]-Hydrogenase in Methanogenic Archaea as Elucidated by Stable-Isotope Labeling. J Am Chem Soc 2012; 134:3271-80. [DOI: 10.1021/ja211594m] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Michael Schick
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Strasse 10, 35043 Marburg, Germany
| | - Xiulan Xie
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein Strasse, 35032 Marburg, Germany
| | - Kenichi Ataka
- Department of Physics, Freie-Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Jörg Kahnt
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Strasse 10, 35043 Marburg, Germany
| | - Uwe Linne
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein Strasse, 35032 Marburg, Germany
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch Strasse 10, 35043 Marburg, Germany
- PRESTO, Japan Science and Technology Agency (JST), Honcho, Kawaguchi, Saitama 332-0012, Japan
| |
Collapse
|
46
|
Chen D, Scopelliti R, Hu X. Reversible Protonation of a Thiolate Ligand in an [Fe]-Hydrogenase Model Complex. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107634] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
47
|
Chen D, Scopelliti R, Hu X. Reversible Protonation of a Thiolate Ligand in an [Fe]-Hydrogenase Model Complex. Angew Chem Int Ed Engl 2012; 51:1919-21. [DOI: 10.1002/anie.201107634] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2011] [Indexed: 11/07/2022]
|
48
|
Shima S, Schick M, Kahnt J, Ataka K, Steinbach K, Linne U. Evidence for acyl–iron ligation in the active site of [Fe]-hydrogenase provided by mass spectrometry and infrared spectroscopy. Dalton Trans 2012; 41:767-71. [DOI: 10.1039/c1dt11093d] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
49
|
|
50
|
Chen D, Scopelliti R, Hu X. A Five-Coordinate Iron Center in the Active Site of [Fe]-Hydrogenase: Hints from a Model Study. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100201] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|