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Utschig LM, Mulfort KL. Photosynthetic biohybrid systems for solar fuels catalysis. Chem Commun (Camb) 2024. [PMID: 39229971 DOI: 10.1039/d4cc00774c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2024]
Abstract
Photosynthetic reaction center (RC) proteins are finely tuned molecular systems optimized for solar energy conversion. RCs effectively capture and convert sunlight with near unity quantum efficiency utilizing light-induced directional electron transfer through a series of molecular cofactors embedded within the protein core to generate a long-lived charge separated state with a useable electrochemical potential. Of current interest are new strategies that couple RC chemistry to the direct synthesis of energy-rich compounds. This Feature Article highlights recent work from our lab on RC and RC-inspired hybrid systems that capture the Sun's energy and convert it to chemical energy in the form of H2, a carbon-neutral energy source derived from water. Biohybrids made from the Photosystem I (PSI) RC are among the best photocatalytic H2-producing protein hybrids to date. Targeted self-assembly strategies that couple abiotic catalysts to PSI translate to catalyst incorporation at intrinsic PSI sites within thylakoid membranes to achieve complete solar water-splitting systems. RC-inspired biohybrids interface synthetic photosensitizers and molecular catalysts with small proteins to create photocatalytic systems and enable the spectroscopic discernment of the structural features and electron transfer processes that underpin solar-driven proton reduction. In total, these studies showcase the incredible scientific opportunities photosynthetic biohybrid research provides for harnessing the optimal qualities of both artificial and natural photosynthetic systems and developing materials that capture, convert, and store solar energy as a fuel.
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Affiliation(s)
- Lisa M Utschig
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.
| | - Karen L Mulfort
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.
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2
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Rumbaugh TD, Gorka MJ, Baker CS, Golbeck JH, Silakov A. Light-induced H 2 generation in a photosystem I-O 2-tolerant [FeFe] hydrogenase nanoconstruct. Proc Natl Acad Sci U S A 2024; 121:e2400267121. [PMID: 39136990 PMCID: PMC11348241 DOI: 10.1073/pnas.2400267121] [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: 01/05/2024] [Accepted: 06/29/2024] [Indexed: 08/15/2024] Open
Abstract
The fusion of hydrogenases and photosynthetic reaction centers (RCs) has proven to be a promising strategy for the production of sustainable biofuels. Type I (iron-sulfur-containing) RCs, acting as photosensitizers, are capable of promoting electrons to a redox state that can be exploited by hydrogenases for the reduction of protons to dihydrogen (H2). While both [FeFe] and [NiFe] hydrogenases have been used successfully, they tend to be limited due to either O2 sensitivity, binding specificity, or H2 production rates. In this study, we fuse a peripheral (stromal) subunit of Photosystem I (PS I), PsaE, to an O2-tolerant [FeFe] hydrogenase from Clostridium beijerinckii using a flexible [GGS]4 linker group (CbHydA1-PsaE). We demonstrate that the CbHydA1 chimera can be synthetically activated in vitro to show bidirectional activity and that it can be quantitatively bound to a PS I variant lacking the PsaE subunit. When illuminated in an anaerobic environment, the nanoconstruct generates H2 at a rate of 84.9 ± 3.1 µmol H2 mgchl-1 h-1. Further, when prepared and illuminated in the presence of O2, the nanoconstruct retains the ability to generate H2, though at a diminished rate of 2.2 ± 0.5 µmol H2 mgchl-1 h-1. This demonstrates not only that PsaE is a promising scaffold for PS I-based nanoconstructs, but the use of an O2-tolerant [FeFe] hydrogenase opens the possibility for an in vivo H2 generating system that can function in the presence of O2.
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Affiliation(s)
- Tristen D Rumbaugh
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
| | - Michael J Gorka
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
| | - Carol S Baker
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802
| | - John H Golbeck
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802
| | - Alexey Silakov
- Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
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3
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Koník P, Skotnicová P, Gupta S, Tichý M, Sharma S, Komenda J, Sobotka R, Krynická V. The cyanobacterial FtsH4 protease controls accumulation of protein factors involved in the biogenesis of photosystem I. BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2024; 1865:149017. [PMID: 37827327 DOI: 10.1016/j.bbabio.2023.149017] [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: 05/30/2023] [Revised: 09/18/2023] [Accepted: 10/04/2023] [Indexed: 10/14/2023]
Abstract
Membrane-bound FtsH proteases are universally present in prokaryotes and in mitochondria and chloroplasts of eukaryotic cells. These metalloproteases are often critical for viability and play both protease and chaperone roles to maintain cellular homeostasis. In contrast to most bacteria bearing a single ftsH gene, cyanobacteria typically possess four FtsH proteases (FtsH1-4) forming heteromeric (FtsH1/3 and FtsH2/3) and homomeric (FtsH4) complexes. The functions and substrate repertoire of each complex are however poorly understood. To identify substrates of the FtsH4 protease complex we established a trapping assay in the cyanobacterium Synechocystis PCC 6803 utilizing a proteolytically inactivated trapFtsH4-His. Around 40 proteins were specifically enriched in trapFtsH4 pulldown when compared with the active FtsH4. As the list of putative FtsH4 substrates contained Ycf4 and Ycf37 assembly factors of Photosystem I (PSI), its core PsaB subunit and the IsiA chlorophyll-binding protein that associates with PSI during iron stress, we focused on these PSI-related proteins. Therefore, we analysed their degradation by FtsH4 in vivo in Synechocystis mutants and in vitro using purified substrates. The data confirmed that FtsH4 degrades Ycf4, Ycf37, IsiA, and also the individual PsaA and PsaB subunits in the unassembled state but not when assembled within the PSI complexes. A possible role of FtsH4 in the PSI life-cycle is discussed.
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Affiliation(s)
- Peter Koník
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic; Faculty of Science, University of South Bohemia, České Budějovice 370 05, Czech Republic
| | - Petra Skotnicová
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic
| | - Sadanand Gupta
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic; Faculty of Science, University of South Bohemia, České Budějovice 370 05, Czech Republic
| | - Martin Tichý
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic
| | - Surbhi Sharma
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic; Faculty of Science, University of South Bohemia, České Budějovice 370 05, Czech Republic
| | - Josef Komenda
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic
| | - Roman Sobotka
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic; Faculty of Science, University of South Bohemia, České Budějovice 370 05, Czech Republic
| | - Vendula Krynická
- Institute of Microbiology of the Czech Academy of Sciences, Centre Algatech, Třeboň 379 01, Czech Republic.
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Allan MG, Pichon T, McCune JA, Cavazza C, Le Goff A, Kühnel MF. Augmenting the Performance of Hydrogenase for Aerobic Photocatalytic Hydrogen Evolution via Solvent Tuning. Angew Chem Int Ed Engl 2023; 62:e202219176. [PMID: 36786366 PMCID: PMC10946759 DOI: 10.1002/anie.202219176] [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: 12/27/2022] [Revised: 02/08/2023] [Accepted: 02/10/2023] [Indexed: 02/15/2023]
Abstract
This work showcases the performance of [NiFeSe] hydrogenase from Desulfomicrobium baculatum for solar-driven hydrogen generation in a variety of organic-based deep eutectic solvents. Despite its well-known sensitivity towards air and organic solvents, the hydrogenase shows remarkable performance under an aerobic atmosphere in these solvents when paired with a TiO2 photocatalyst. Tuning the water content further increases hydrogen evolution activity to a TOF of 60±3 s-1 and quantum yield to 2.3±0.4 % under aerobic conditions, compared to a TOF of 4 s-1 in a purely aqueous solvent. Contrary to common belief, this work therefore demonstrates that placing natural hydrogenases into non-natural environments can enhance their intrinsic activity beyond their natural performance, paving the way for full water splitting using hydrogenases.
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Affiliation(s)
- Michael G. Allan
- Department of ChemistryFaculty of Science and EngineeringSwansea UniversitySingleton ParkSwanseaSA2 8PPWalesUK
| | - Thomas Pichon
- Univ. Grenoble AlpesCEACNRSIRIGCBM38000GrenobleFrance
| | - Jade A. McCune
- Melville Laboratory for Polymer SynthesisUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | | | - Alan Le Goff
- University Grenoble AlpesCNRSDCM UMR 5250F-38000GrenobleFrance
| | - Moritz F. Kühnel
- Department of ChemistryFaculty of Science and EngineeringSwansea UniversitySingleton ParkSwanseaSA2 8PPWalesUK
- Dept. Hydrogen Labs and Field TestsFraunhofer Institute for Wind Energy SystemsAm Haupttor, BC 431006237LeunaGermany
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5
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Leone L, Sgueglia G, La Gatta S, Chino M, Nastri F, Lombardi A. Enzymatic and Bioinspired Systems for Hydrogen Production. Int J Mol Sci 2023; 24:ijms24108605. [PMID: 37239950 DOI: 10.3390/ijms24108605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 04/30/2023] [Accepted: 05/08/2023] [Indexed: 05/28/2023] Open
Abstract
The extraordinary potential of hydrogen as a clean and sustainable fuel has sparked the interest of the scientific community to find environmentally friendly methods for its production. Biological catalysts are the most attractive solution, as they usually operate under mild conditions and do not produce carbon-containing byproducts. Hydrogenases promote reversible proton reduction to hydrogen in a variety of anoxic bacteria and algae, displaying unparallel catalytic performances. Attempts to use these sophisticated enzymes in scalable hydrogen production have been hampered by limitations associated with their production and stability. Inspired by nature, significant efforts have been made in the development of artificial systems able to promote the hydrogen evolution reaction, via either electrochemical or light-driven catalysis. Starting from small-molecule coordination compounds, peptide- and protein-based architectures have been constructed around the catalytic center with the aim of reproducing hydrogenase function into robust, efficient, and cost-effective catalysts. In this review, we first provide an overview of the structural and functional properties of hydrogenases, along with their integration in devices for hydrogen and energy production. Then, we describe the most recent advances in the development of homogeneous hydrogen evolution catalysts envisioned to mimic hydrogenases.
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Affiliation(s)
- Linda Leone
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy
| | - Gianmattia Sgueglia
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy
| | - Salvatore La Gatta
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy
| | - Marco Chino
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy
| | - Flavia Nastri
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy
| | - Angela Lombardi
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy
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Wang P, Frank A, Zhao F, Nowaczyk MM, Conzuelo F, Schuhmann W. A biomimetic assembly of folded photosystem I monolayers for an improved light utilization in biophotovoltaic devices. Bioelectrochemistry 2023; 149:108288. [DOI: 10.1016/j.bioelechem.2022.108288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 10/03/2022] [Accepted: 10/05/2022] [Indexed: 12/04/2022]
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Pamu R, Khomami B, Mukherjee D. Observation of anomalous carotenoid and blind chlorophyll activations in photosystem I under synthetic membrane confinements. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183930. [PMID: 35398026 DOI: 10.1016/j.bbamem.2022.183930] [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: 08/02/2021] [Revised: 03/27/2022] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
The role of natural thylakoid membrane confinements in architecting the robust structural and electrochemical properties of PSI is not fully understood. Most PSI studies till date extract the proteins from their natural confinements that can lead to non-native conformations. Recently our group had successfully reconstituted PSI in synthetic lipid membranes using detergent-mediated liposome solubilizations. In this study, we investigate the alterations in chlorophylls and carotenoids interactions and reorganization in PSI based on spectral property changes induced by its confinement in anionic DPhPG and zwitterionic DPhPC phospholipid membranes. To this end, we employ a combination of absorption, fluorescence, and circular dichroism (CD) spectroscopic measurements. Our results indicate unique activation and alteration of photoresponses from the PSI carotenoid (Car) bands in PSI-DPhPG proteoliposomes that can tune the Excitation Energy Transfer (EET), otherwise absent in PSI at non-native environments. Specifically, we observe broadband light harvesting via enhanced absorption in the otherwise non-absorptive green region (500-580 nm) of the Chlorophylls (Chl) along with ~64% increase in the full-width half maximum of the Qy band (650-720 nm). The CD results indicate enhanced Chl-Chl and Chl-Car interactions along with conformational changes in protein secondary structures. Such distinct changes in the Car and Chl bands are not observed in PSI confined in DPhPC. The fundamental insights into membrane microenvironments tailoring PSI subunits reorganization and interactions provide novel strategies for tuning photoexcitation processes and rational designing of biotic-abiotic interfaces in PSI-based photoelectrochemical energy conversion systems.
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Affiliation(s)
- Ravi Pamu
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA
| | - Bamin Khomami
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA; Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA.
| | - Dibyendu Mukherjee
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA; Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3), University of Tennessee, Knoxville, TN 37996, USA; Sustainable Energy Education and Research Center (SEERC), University of Tennessee, Knoxville, TN 37996, USA.
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8
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Competition between intra-protein charge recombination and electron transfer outside photosystem I complexes used for photovoltaic applications. Photochem Photobiol Sci 2022; 21:319-336. [PMID: 35119621 DOI: 10.1007/s43630-022-00170-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 01/07/2022] [Indexed: 02/01/2023]
Abstract
Photosystem I (PSI) complexes isolated from three different species were electrodeposited on FTO conducting glass, forming a photoactive multilayer of the photo-electrode, for investigation of intricate electron transfer (ET) properties in such green hybrid nanosystems. The internal quantum efficiency of photo-electrochemical cells (PEC) containing the PSI-based photo-electrodes did not exceed ~ 0.5%. To reveal the reason for such a low efficiency of photocurrent generation, the temporal evolution of the transient concentration of the photo-oxidized primary electron donor, P+, was studied in aqueous suspensions of the PSI complexes by time-resolved absorption spectroscopy. The results of these measurements provided the information on: (1) completeness of charge separation in PSI reaction centers (RCs), (2) dynamics of internal charge recombination, and (3) efficiency of electron transfer from PSI to the electrolyte, which is the reaction competing with the internal charge recombination in the PSI RC. The efficiency of the full charge separation in the PSI complexes used for functionalization of the electrodes was ~ 90%, indicating that incomplete charge separation was not the main reason for the small yield of photocurrents. For the PSI particles isolated from a green alga Chlamydomonas reinhardtii, the probability of ET outside PSI was ~ 30-40%, whereas for their counterparts isolated from a cyanobacterium Synechocystis sp. PCC 6803 and a red alga Cyanidioschyzon merolae, it represented a mere ~ 4%. We conclude from the transient absorption data for the PSI biocatalysts in solution that the observed small photocurrent efficiency of ~ 0.5% for all the PECs analyzed in this study is likely due to: (1) limited efficiency of ET outside PSI, particularly in the case of PECs based on PSI from Synechocystis and C. merolae, and (2) the electrolyte-mediated electric short-circuiting in PSI particles forming the photoactive layer, particularly in the case of the C. reinhardtii PEC.
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Kim YJ, Hong H, Yun J, Kim SI, Jung HY, Ryu W. Photosynthetic Nanomaterial Hybrids for Bioelectricity and Renewable Energy Systems. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2005919. [PMID: 33236450 DOI: 10.1002/adma.202005919] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/08/2020] [Indexed: 06/11/2023]
Abstract
Harvesting solar energy in the form of electricity from the photosynthesis of plants, algal cells, and bacteria has been researched as the most environment-friendly renewable energy technology in the last decade. The primary challenge has been the engineering of electrochemical interfacing with photosynthetic apparatuses, organelles, or whole cells. However, with the aid of low-dimensional nanomaterials, there have been many advances, including enhanced photon absorption, increased generation of photosynthetic electrons (PEs), and more efficient transfer of PEs to electrodes. These advances have demonstrated the possibility for the technology to advance to a new level. In this article, the fundamentals of photosynthesis are introduced. How PE harvesting systems have improved concerning solar energy absorption, PE production, and PE collection by electrodes is discussed. The review focuses on how different kinds of nanomaterials are applied and function in interfacing with photosynthetic materials for enhanced PE harvesting. Finally, the review analyzes how the performance of PE harvesting and stand-alone systems have evolved so far and its future prospects.
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Affiliation(s)
- Yong Jae Kim
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - Hyeonaug Hong
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - JaeHyoung Yun
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - Seon Il Kim
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - Ho Yun Jung
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - WonHyoung Ryu
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
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Yamanoi Y, Nakae T, Nishihara H. Bio-organic-inorganic hybrid soft materials: photoelectric conversion systems based on photosystem I and II with molecular wires. CHEM LETT 2021. [DOI: 10.1246/cl.210111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yoshinori Yamanoi
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Toyotaka Nakae
- Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroshi Nishihara
- Research Center for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
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12
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Meyers A, Heilweil EJ, Stromberg CJ. Photodynamics of Asymmetric Di-Iron-Cyano Hydrogenases Examined by Time-Resolved Mid-Infrared Spectroscopy. J Phys Chem A 2021; 125:1413-1423. [PMID: 33567824 DOI: 10.1021/acs.jpca.0c08921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two anionic asymmetric Fe-Fe hydrogenase model compounds containing a single cyano (CN) and five carboxyl (CO) ligands, [Et4N][Fe2(μ-S2C3H6)(CO)5(CN)1] and [Et4N][Fe2(μ-S2C2H4)(CO)5(CN)1], dissolved in room-temperature acetonitrile, are examined. The molecular asymmetry affects the redox potentials of the central iron atoms, thus changing the photophysics and possible catalytic properties of the compounds. Femtosecond ultraviolet excitation with mid-infrared probe spectroscopy of the model compounds was employed to better understand the ultrafast dynamics of the enzyme-active site. Continuous ultraviolet lamp excitation with Fourier transform infrared (FTIR) spectroscopy was also used to explore stable product formation on the second timescale. For both model compounds, two timescales are observed; a 20-30 ps decay and the formation of a long-lived photoproduct. The picosecond decay is assigned to vibrational cooling and rotational dynamics, while the residual spectra remain for up to 300 ps, suggesting the formation of new photoproducts. Static FTIR spectroscopy yielded a different stable photoproduct than that observed on the ultrafast timescale. Density functional theory calculations simulated photoproducts for CO-loss and CN-loss isomers, and the resulting photoproduct spectra suggest that the picosecond transients arise from a complex mixture of isomerization after CO-loss, while dimerization and formation of a CN-containing Fe-CO-Fe bridged species are also considered.
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Affiliation(s)
- Amber Meyers
- Department of Chemistry and Physics, Hood College, Frederick, Maryland 21701-8524, United States
| | - Edwin J Heilweil
- Nanoscale Device Characterization Division, Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, United States
| | - Christopher J Stromberg
- Department of Chemistry and Physics, Hood College, Frederick, Maryland 21701-8524, United States
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Wang P, Frank A, Zhao F, Szczesny J, Junqueira JRC, Zacarias S, Ruff A, Nowaczyk MM, Pereira IAC, Rögner M, Conzuelo F, Schuhmann W. Gemischte Photosystem‐I‐Monoschichten ermöglichen einen verbesserten anisotropen Elektronenfluss in Biophotovoltaik‐Systemen durch Unterdrückung elektrischer Kurzschlüsse. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202008958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Panpan Wang
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Anna Frank
- Plant Biochemistry Faculty of Biology and Biotechnology Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Fangyuan Zhao
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Julian Szczesny
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - João R. C. Junqueira
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Sónia Zacarias
- Instituto de Tecnologia Química e Biológica António Xavier Universidade Nova de Lisboa Oeiras 2780-157 Portugal
| | - Adrian Ruff
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
- PPG (Deutschland) Business Support GmbH PPG Packaging Coatings EMEA Erlenbrunnenstraße 20 72411 Bodelshausen Deutschland
| | - Marc M. Nowaczyk
- Plant Biochemistry Faculty of Biology and Biotechnology Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Inês A. C. Pereira
- Instituto de Tecnologia Química e Biológica António Xavier Universidade Nova de Lisboa Oeiras 2780-157 Portugal
| | - Matthias Rögner
- Plant Biochemistry Faculty of Biology and Biotechnology Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Felipe Conzuelo
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
| | - Wolfgang Schuhmann
- Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 44780 Bochum Deutschland
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14
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Wang P, Frank A, Zhao F, Szczesny J, Junqueira JRC, Zacarias S, Ruff A, Nowaczyk MM, Pereira IAC, Rögner M, Conzuelo F, Schuhmann W. Closing the Gap for Electronic Short-Circuiting: Photosystem I Mixed Monolayers Enable Improved Anisotropic Electron Flow in Biophotovoltaic Devices. Angew Chem Int Ed Engl 2021; 60:2000-2006. [PMID: 33075190 PMCID: PMC7894356 DOI: 10.1002/anie.202008958] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 10/15/2020] [Indexed: 11/10/2022]
Abstract
Well-defined assemblies of photosynthetic protein complexes are required for an optimal performance of semi-artificial energy conversion devices, capable of providing unidirectional electron flow when light-harvesting proteins are interfaced with electrode surfaces. We present mixed photosystem I (PSI) monolayers constituted of native cyanobacterial PSI trimers in combination with isolated PSI monomers from the same organism. The resulting compact arrangement ensures a high density of photoactive protein complexes per unit area, providing the basis to effectively minimize short-circuiting processes that typically limit the performance of PSI-based bioelectrodes. The PSI film is further interfaced with redox polymers for optimal electron transfer, enabling highly efficient light-induced photocurrent generation. Coupling of the photocathode with a [NiFeSe]-hydrogenase confirms the possibility to realize light-induced H2 evolution.
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Affiliation(s)
- Panpan Wang
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Anna Frank
- Plant BiochemistryFaculty of Biology and BiotechnologyRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Fangyuan Zhao
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Julian Szczesny
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - João R. C. Junqueira
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Sónia Zacarias
- Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeiras2780-157Portugal
| | - Adrian Ruff
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
- Present Address: PPG (Deutschland) Business Support GmbHPPG Packaging Coatings EMEAErlenbrunnenstrasse 2072411BodelshausenGermany
| | - Marc M. Nowaczyk
- Plant BiochemistryFaculty of Biology and BiotechnologyRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Inês A. C. Pereira
- Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeiras2780-157Portugal
| | - Matthias Rögner
- Plant BiochemistryFaculty of Biology and BiotechnologyRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Felipe Conzuelo
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
| | - Wolfgang Schuhmann
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstrasse 15044780BochumGermany
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15
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Abstract
Transmembrane proteins involved in metabolic redox reactions and photosynthesis catalyse a plethora of key energy-conversion processes and are thus of great interest for bioelectrocatalysis-based applications. The development of membrane protein modified electrodes has made it possible to efficiently exchange electrons between proteins and electrodes, allowing mechanistic studies and potentially applications in biofuels generation and energy conversion. Here, we summarise the most common electrode modification and their characterisation techniques for membrane proteins involved in biofuels conversion and semi-artificial photosynthesis. We discuss the challenges of applications of membrane protein modified electrodes for bioelectrocatalysis and comment on emerging methods and future directions, including recent advances in membrane protein reconstitution strategies and the development of microbial electrosynthesis and whole-cell semi-artificial photosynthesis.
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16
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Dumele O, Chen J, Passarelli JV, Stupp SI. Supramolecular Energy Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1907247. [PMID: 32162428 DOI: 10.1002/adma.201907247] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 01/17/2020] [Indexed: 06/10/2023]
Abstract
Self-assembly is a bioinspired strategy to craft materials for renewable and clean energy technologies. In plants, the alignment and assembly of the light-harvesting protein machinery in the green leaf optimize the ability to efficiently convert light from the sun to form chemical bonds. In artificial systems, strategies based on self-assembly using noncovalent interactions offer the possibility to mimic this functional correlation among molecules to optimize photocatalysis, photovoltaics, and energy storage. One of the long-term objectives of the field described here as supramolecular energy materials is to learn how to design soft materials containing light-harvesting assemblies and catalysts to generate fuels and useful chemicals. Supramolecular energy materials also hold great potential in the design of systems for photovoltaics in which intermolecular interactions in self-assembled structures, for example, in electron donor and acceptor phases, maximize charge transport and avoid exciton recombination. Possible pathways to integrate organic and inorganic structures by templating strategies and electrodeposition to create materials relevant to energy challenges including photoconductors and supercapacitors are also described. The final topic discussed is the synthesis of hybrid perovskites in which organic molecules are used to modify both structure and functions, which may include chemical stability, photovoltaics, and light emission.
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Affiliation(s)
- Oliver Dumele
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA
| | - Jiahao Chen
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - James V Passarelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Samuel I Stupp
- Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
- Department of Medicine, Northwestern University, Chicago, IL, 60611, USA
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60208, USA
- Simpson Querrey Institute, Northwestern University, Chicago, IL, 60611, USA
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17
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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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18
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Gorka M, Golbeck JH. Generating dihydrogen by tethering an [FeFe]hydrogenase via a molecular wire to the A 1A/A 1B sites of photosystem I. PHOTOSYNTHESIS RESEARCH 2020; 143:155-163. [PMID: 31673863 DOI: 10.1007/s11120-019-00685-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 10/15/2019] [Indexed: 06/10/2023]
Abstract
Photosystem I complexes from the menB deletion mutant of Synechocystis sp. PCC 6803 were previously wired to a Pt nanoparticle via a molecular wire consisting of 15-(3-methyl-1,4-naphthoquinone-2-yl)]pentadecyl sulfide. In the presence of a sacrificial electron donor and an electron transport mediator, the PS I-NQ(CH2)15S-Pt nanoconstruct generated dihydrogen at a rate of 44.3 µmol of H2 mg Chl-1 h-1 during illumination at pH 8.3. The menB deletion strain contains an interruption in the biosynthetic pathway of phylloquinone, which results in the presence of a displaceable plastoquinone-9 in the A1A/A1B sites. The synthesized quinone contains a headgroup identical to the native phylloquinone along with a 15-carbon long tail that is terminated in a thiol. The thiol on the molecular wire is used to bind the Pt nanoparticle. In this short communication, we replaced the Pt nanoparticle with an [FeFe]H2ase variant from Clostridium acetobutylicum that contains an exposed iron on the distal [4Fe-4S] cluster afforded by mutating the surface exposed Cys97 residue to Gly. The thiol on the molecular wire is then used to coordinate the corner iron atom of the iron-sulfur cluster. When all three components are combined and illuminated in the presence of a sacrificial electron donor and an electron transport mediator, the PS I-NQ(CH2)15S-[FeFe]H2ase nanoconstruct generated dihydrogen at a rate of 50.3 ± 9.96 μmol of H2 mg Chl-1 h-1 during illumination at pH 8.3. This successful in vitro experiment sets the stage for assembling a PS I-NQ(CH2)15S-[FeFe]H2ase nanoconstruct in vivo in the menB mutant of Synechocystis sp. PCC 6803.
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Affiliation(s)
- Michael Gorka
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, 16802, USA
| | - John H Golbeck
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, 16802, USA.
- Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA.
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, S328 Frear Building, University Park, PA, 16802, USA.
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19
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Walters KA, Golbeck JH. Designing a modified clostridial 2[4Fe-4S] ferredoxin as a redox coupler to directly link photosystem I with a Pt nanoparticle. PHOTOSYNTHESIS RESEARCH 2020; 143:165-181. [PMID: 31643016 DOI: 10.1007/s11120-019-00679-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 10/01/2019] [Indexed: 06/10/2023]
Abstract
A methodology previously developed in our laboratory utilized an aliphatic hydrocarbon terminated by thiol groups to tether two redox proteins, i.e., the [4Fe-4S] cluster FB of photosystem I (PS I) and the distal [4Fe-4S] cluster of a [FeFe]-hydrogenase, to create a biohybrid dihydrogen-generating complex. These studies guided the design of a modified 2[4Fe-4S] cluster ferredoxin from Clostridium pasteurianum (CpFd) containing two externally facing cysteine residues in close proximity to each [4Fe-4S] cluster that replaces the aliphatic hydrocarbon dithiol tether. The advantage of using a protein is the potential to create a coupled dihydrogen-generating system in vivo. The wild-type CpFdWT and variants CpFdS11C/D40C, CpFdP20C/P49C, CpFdD7S/D36S, CpFdS11C/D40C/D7S/D36S and CpFdP20C/P49C/D7S/D36S were expressed in Escherichia coli and found to contain ~ 8 Fe and ~ 8 S atoms. The absorption spectra of the wild-type and CpFd variants displayed a peak centered at ~ 390 nm characteristic of a S → Fe charge transfer band that diminishes upon reduction with Na-dithionite. Low-temperature X-band EPR studies of the Na-dithionite-reduced wild-type and CpFd variants showed a complex spectrum indicative of two magnetically coupled [4Fe-4S]1+ clusters. EPR-monitored redox titrations of CpFdWT, CpFdD7S/D36S, CpFdS11C/D40C, CpFdP20C/P49C, CpFdS11C/D40C/D7S/D36S and CpFdP20C/P49C/D7S/D36S revealed redox potentials of - 412 ± 8 mV, - 395 ± 4 mV, - 408 ± 7 mV, - 426 ± 11 mV, - 384 ± 4 mV and - 423 ± 4 mV, respectively. The in vitro PS I-CpFdS11C/D40C/D7S/D36S-Pt nanoparticle complex was the highest performer, generating dihydrogen at a rate of 3.25 μmol H2 mg Chl-1 h-1 or 278.8 mol H2 mol PS I-1 h-1 under continuous illumination.
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Affiliation(s)
- Karim A Walters
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, S328 Frear Building, University Park, PA, 16802, USA
| | - John H Golbeck
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, S328 Frear Building, University Park, PA, 16802, USA.
- Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA.
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20
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Brown KA, King PW. Coupling biology to synthetic nanomaterials for semi-artificial photosynthesis. PHOTOSYNTHESIS RESEARCH 2020; 143:193-203. [PMID: 31641988 DOI: 10.1007/s11120-019-00670-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 09/04/2019] [Indexed: 06/10/2023]
Abstract
Biohybrid artificial photosynthesis aims to combine the advantages of biological specificity with a range of synthetic nanomaterials to create innovative semi-synthetic systems for solar-to-chemical conversion. Biological systems utilize highly efficient molecular catalysts for reduction-oxidation reactions. They can operate with minimal overpotentials while selectively channeling reductant energy into specific transformation chemistries and product forming pathways. Nanomaterials can be synthesized to have efficient light-absorption capacity and tuneability of charge separation by manipulation of surface chemistries and bulk compositions. These complementary aspects have been combined in a variety of ways, for example, where biological light-harvesting complexes function as antenna for nanoparticle catalysts or where nanoparticles function as light capture, charge separation components for coupling to chemical conversion by redox enzymes and whole cells. The synthetic diversity that is possible with biohybrids is still being explored. The progress arising from creative approaches is generating new model systems to inspire scale-up technologies and generate understanding of the fundamental mechanisms that control energy conversion at the molecular scale. These efforts are leading to discoveries of essential design principles that can enable the development of scalable artificial photosynthesis systems.
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Affiliation(s)
| | - Paul W King
- National Renewable Energy Laboratory, Golden, CO, 80402, USA
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21
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Brahmachari U, Pokkuluri PR, Tiede DM, Niklas J, Poluektov OG, Mulfort KL, Utschig LM. Interprotein electron transfer biohybrid system for photocatalytic H 2 production. PHOTOSYNTHESIS RESEARCH 2020; 143:183-192. [PMID: 31925629 DOI: 10.1007/s11120-019-00705-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 12/23/2019] [Indexed: 05/18/2023]
Abstract
Worldwide there is a large research investment in developing solar fuel systems as clean and sustainable sources of energy. The fundamental mechanisms of natural photosynthesis can provide a source of inspiration for these studies. Photosynthetic reaction center (RC) proteins capture and convert light energy into chemical energy that is ultimately used to drive oxygenic water-splitting and carbon fixation. For the light energy to be used, the RC communicates with other donor/acceptor components via a sophisticated electron transfer scheme that includes electron transfer reactions between soluble and membrane bound proteins. Herein, we reengineer an inherent interprotein electron transfer pathway in a natural photosynthetic system to make it photocatalytic for aqueous H2 production. The native electron shuttle protein ferredoxin (Fd) is used as a scaffold for binding of a ruthenium photosensitizer and H2 catalytic function is imparted to its partner protein, ferredoxin-NADP+-reductase (FNR), by attachment of cobaloxime molecules. We find that this 2-protein biohybrid system produces H2 in aqueous solutions via light-induced interprotein electron transfer reactions (TON > 2500 H2/FNR), providing insight about using native protein-protein interactions as a method for fuel generation.
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Affiliation(s)
- Udita Brahmachari
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - P Raj Pokkuluri
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - David M Tiede
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Jens Niklas
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Oleg G Poluektov
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Karen L Mulfort
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Lisa M Utschig
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA.
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22
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Fang X, Kalathil S, Reisner E. Semi-biological approaches to solar-to-chemical conversion. Chem Soc Rev 2020; 49:4926-4952. [DOI: 10.1039/c9cs00496c] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This review provides an overview of the cross-disciplinary field of semi-artificial photosynthesis, which combines strengths of biocatalysis and artificial photosynthesis to develop new concepts and approaches for solar-to-chemical conversion.
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Affiliation(s)
- Xin Fang
- Department of Chemistry
- University of Cambridge
- Cambridge CB2 1EW
- UK
| | - Shafeer Kalathil
- Department of Chemistry
- University of Cambridge
- Cambridge CB2 1EW
- UK
| | - Erwin Reisner
- Department of Chemistry
- University of Cambridge
- Cambridge CB2 1EW
- UK
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23
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Utschig LM, Soltau SR, Mulfort KL, Niklas J, Poluektov OG. Z-scheme solar water splitting via self-assembly of photosystem I-catalyst hybrids in thylakoid membranes. Chem Sci 2018; 9:8504-8512. [PMID: 30568774 PMCID: PMC6256728 DOI: 10.1039/c8sc02841a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 10/20/2018] [Indexed: 01/01/2023] Open
Abstract
Nature's solar energy converters, the Photosystem I (PSI) and Photosystem II (PSII) reaction center proteins, flawlessly manage photon capture and conversion processes in plants, algae, and cyanobacteria to drive oxygenic water-splitting and carbon fixation. Herein, we utilize the native photosynthetic Z-scheme electron transport chain to drive hydrogen production from thylakoid membranes by directional electron transport to abiotic catalysts bound at the stromal end of PSI. Pt-nanoparticles readily self-assemble with PSI in spinach and cyanobacterial membranes as evidenced by light-driven H2 production in the presence of a mediating electron shuttle protein and the sacrificial electron donor sodium ascorbate. EPR characterization confirms placement of the Pt-nanoparticles on the acceptor end of PSI. In the absence of sacrificial reductant, H2 production at PSI occurs via coupling to light-induced PSII O2 evolution as confirmed by correlation of catalytic activity to the presence or absence of the PSII inhibitor DCMU. To create a more sustainable system, first-row transition metal molecular cobaloxime and nickel diphosphine catalysts were found to perform photocatalysis when bound in situ to cyanobacterial thylakoid membranes. Thus, the self-assembly of abiotic catalysts with photosynthetic membranes demonstrates a tenable method for accomplishing solar overall water splitting to generate H2, a renewable and clean fuel. This work benchmarks a significant advance toward improving photosynthetic efficiency for solar fuel production.
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Affiliation(s)
- Lisa M Utschig
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA .
| | - Sarah R Soltau
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA .
| | - Karen L Mulfort
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA .
| | - Jens Niklas
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA .
| | - Oleg G Poluektov
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA .
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24
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Walters KA, Golbeck JH. Expression, purification and characterization of an active C491G variant of ferredoxin sulfite reductase from Synechococcus elongatus PCC 7942. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:1096-1107. [PMID: 29959913 DOI: 10.1016/j.bbabio.2018.06.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 06/22/2018] [Accepted: 06/26/2018] [Indexed: 10/28/2022]
Abstract
Recently developed molecular wire technology takes advantage of [4Fe-4S] clusters that are ligated by at least one surface exposed Cys residue. Mutagenesis of this Cys residue to a Gly opens an exchangeable coordination site to a corner iron atom that can be chemically rescued by an external thiolate ligand. This ligand can be subsequently displaced by mass action using a dithiol molecular wire to tether two redox active proteins. We intend to apply this technique to tethering Photosystem I to ferredoxin sulfite reductase (FdSiR), an enzyme that catalyzes the six-electron reduction of sulfite to hydrogen sulfite and nitrite to ammonia. The enzyme contains a [4Fe-4S]2+/1+ cluster and a siroheme active site. FdSiRWT and an FdSiRC491G variant were cloned from Synechococcus elongatus PCC 7942 and expressed along with the cysG gene from Salmonella typhimurium using the pCDFDuet plasmid. UV/Vis absorbance spectra of both FdSiRWT and the FdSiRC491G variant displayed characteristic peaks at 278, 392 (Soret), 585 (α) and 714 nm (charge transfer band), and 278, 394 (Soret), 587 (α) and 714 nm (charge transfer band) respectively. Both enzymes in their as-isolated forms displayed an EPR spectrum characteristic of an S = 5/2 high spin heme. When reduced, both enzymes exhibited the signal of a low spin S = 1/2 [4Fe-4S]1+ cluster. The FdSiRWT and FdSiRC491G variant both showed activity using reduced methyl viologen and Synechococcus elongatus PCC 7942 ferredoxin 1 (Fd1) as electron donors. Based on these results, the FdSIRC491G variant should be a suitable candidate for wiring to Photosystem I.
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Affiliation(s)
- Karim A Walters
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, United States
| | - John H Golbeck
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, United States; Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States.
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25
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Stromberg CJ, Heilweil EJ. Ultrafast Photodynamics of Cyano-Functionalized [FeFe] Hydrogenase Model Compounds. J Phys Chem A 2018; 122:4023-4030. [PMID: 29652502 PMCID: PMC6051340 DOI: 10.1021/acs.jpca.8b00661] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[FeFe] hydrogenases are efficient enzymes that produce hydrogen gas under mild conditions. Synthetic model compounds containing all CO or mixed CO/PMe3 ligands were previously studied by us and others with ultrafast ultraviolet or visible pump-infrared probe spectroscopy in an effort to better understand the function and interactions of the active site with light. Studies of anionic species containing cyano groups, which more closely match the biological active site, have been elusive. In this work, two model compounds dissolved in room-temperature acetonitrile solution were examined: [Fe2(μ-S2C3H6)(CO)4(CN)2]2- (1) and [Fe2(μ-S2C2H4)(CO)4(CN)2]2- (2). These species exhibit long-lived transient signals consistent with loss of one CO ligand with potential isomerization of newly formed ground electronic state photoproducts, as previously observed with all-CO and CO/PMe3-containing models. We find no evidence for fast (ca. 150 ps) relaxation seen in the all-CO and CO/PMe3 compounds because of the absence of the metal-to-metal charge transfer band in the cyano-functionalized models. These results indicate that incorporation of cyano ligands may significantly alter the electronic properties and photoproducts produced immediately after photoexcitation, which may influence the catalytic activity of model compounds when attached to photosensitizers.
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Affiliation(s)
- Christopher J. Stromberg
- Department of Chemistry and Physics, Hood College, 401 Rosemont Avenue, Frederick, Maryland 21701-8524, United States
| | - Edwin J. Heilweil
- Engineering Physics Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8443 United States
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26
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Pérez AA, Ferlez BH, Applegate AM, Walters K, He Z, Shen G, Golbeck JH, Bryant DA. Presence of a [3Fe-4S] cluster in a PsaC variant as a functional component of the photosystem I electron transfer chain in Synechococcus sp. PCC 7002. PHOTOSYNTHESIS RESEARCH 2018; 136:31-48. [PMID: 28916964 DOI: 10.1007/s11120-017-0437-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 08/23/2017] [Indexed: 06/07/2023]
Abstract
A site-directed C14G mutation was introduced into the stromal PsaC subunit of Synechococcus sp. strain PCC 7002 in vivo in order to introduce an exchangeable coordination site into the terminal FB [4Fe-4S] cluster of Photosystem I (PSI). Using an engineered PSI-less strain (psaAB deletion), psaC was deleted and replaced with recombinant versions controlled by a strong promoter, and the psaAB deletion was complemented. Modified PSI accumulated at lower levels in this strain and supported slower photoautotrophic growth than wild type. As-isolated PSI complexes containing PsaCC14G showed resonances with g values of 2.038 and 2.007 characteristic of a [3Fe-4S]1+ cluster. When the PSI complexes were illuminated at 15 K, these resonances partially disappeared and two new sets of resonances appeared. The majority set had g values of 2.05, 1.95, and 1.85, characteristic of FA-, and the minority set had g values of 2.11, 1.90, and 1.88 from FB' in the modified site. The S = 1/2 spin state of the latter implied the presence of a thiolate as the terminal ligand. The [3Fe-4S] clusters could be partially reconstituted with iron, producing a larger population of [4Fe-4S] clusters. Rates of flavodoxin reduction were identical in PSI complexes isolated from wild type and the PsaCC14G variant strain; this implied equivalent capacity for forward electron transfer in PSI complexes that contained [3Fe-4S] and [4Fe-4S] clusters. The development of this cyanobacterial strain is a first step toward translation of in vitro PSI-based biosolar molecular wire systems in vivo and provides new insights into the formation of Fe/S clusters.
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Affiliation(s)
- Adam A Pérez
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY, 40202, USA
| | - Bryan H Ferlez
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
- Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI, 28824, USA
| | - Amanda M Applegate
- Department of Chemistry, The Pennsylvania State University, University Park, PA, USA
- Musculoskeletal Transplant Foundation, Jessup, PA, 18434, USA
| | - Karim Walters
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
| | - Zhihui He
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
| | - Gaozhong Shen
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA
| | - John H Golbeck
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA.
- Department of Chemistry, The Pennsylvania State University, University Park, PA, USA.
| | - Donald A Bryant
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA.
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT, USA.
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27
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Pamu R, Sandireddy VP, Kalyanaraman R, Khomami B, Mukherjee D. Plasmon-Enhanced Photocurrent from Photosystem I Assembled on Ag Nanopyramids. J Phys Chem Lett 2018; 9:970-977. [PMID: 29405719 DOI: 10.1021/acs.jpclett.7b03255] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Plasmonic metal nanostructures have been known to tune optoelectronic properties of fluorophores. Here, we report the first-ever experimental observation of plasmon-induced photocurrent enhancements from Photosystem I (PSI) immobilized on Fischer patterns of silver nanopyramids (Ag-NP). To this end, the plasmonic peaks of Ag-NP were tuned to match the PSI absorption peaks at ∼450 and ∼680 nm wavelengths. Specifically, the plasmon-enhanced photocurrents indicate enhancement factors of ∼6.5 and ∼5.8 as compared to PSI assembly on planar Ag substrates for nominal excitation wavelengths of 660 and 470 nm, respectively. The comparable enhancement factors from both 470 and 660 nm excitations, in spite of a significantly weaker plasmon absorption peak at ∼450 nm for the Ag-NP structures, can be rationalized by previously reported excessive plasmon-induced fluorescence emission losses from PSI in the red region as compared to the blue region of the excitation wavelengths.
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Affiliation(s)
- Ravi Pamu
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - V Prasad Sandireddy
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Ramki Kalyanaraman
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Bamin Khomami
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Dibyendu Mukherjee
- Department of Mechanical, Aerospace, and Biomedical Engineering; ‡Department of Chemical and Biomolecular Engineering; §Department of Material Science and Engineering; ∥Nano-BioMaterials Laboratory for Energy, Energetics & Environment (nbml-E3); ⊥Sustainable Energy Education and Research Center (SEERC), University of Tennessee , Knoxville, Tennessee 37996, United States
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28
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Meyer RL, Zhandosova AD, Biser TM, Heilweil EJ, Stromberg CJ. Photochemical Dynamics of a Trimethyl-Phosphine Derivatized [FeFe]-Hydrogenase Model Compound. Chem Phys 2018; 512. [PMID: 30983684 DOI: 10.1016/j.chemphys.2017.12.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Though there have been many studies on photosensitizers coupled to model complexes of the [FeFe]-hydrogenases, few have looked at how the models react upon exposure to light. To extract photoreaction information, ultrafast time-resolved UV/visible pump, IR probe spectroscopy was performed on Fe2(μ-S2C2H4)(CO)4(PMe3)2 (2b) dissolved in heptane and acetonitrile and the photochemical dynamics were determined. Excitation with 532 and 355 nm light produces bleaches and new absorptions that decay to half their original intensity with time constants of 300 ± 120 ps and 380 ± 210 ps in heptane and acetonitrile, respectively. These features persist to the microsecond timescale. The dynamics of 2b are assigned to formation of an initial set of photoproducts, which were a mixture of excited-state tricarbonyl isomers. These isomers decay into another set of long-lived photoproducts in which approximately half the excited-state tricarbonyl isomers recombine with CO to form another complex mixture of tricarbonyl and tetracarbonyl isomers.
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Affiliation(s)
- Rachel L Meyer
- Department of Chemistry and Physics, Hood College, 401 Rosemont Ave., Frederick, MD, 21701-8524, USA.,Department of Chemistry, University of Rochester, RC Box 270216, Rochester, NY 14627
| | - Annette D Zhandosova
- Department of Chemistry and Physics, Hood College, 401 Rosemont Ave., Frederick, MD, 21701-8524, USA.,Touro College of Osteopathic Medicine, 230 West 125 St., New York, NY 10027
| | - Tara M Biser
- Department of Chemistry and Physics, Hood College, 401 Rosemont Ave., Frederick, MD, 21701-8524, USA.,Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe St., Baltimore, MD 21205
| | - Edwin J Heilweil
- Radiation Physics Division, Physical Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8443, USA
| | - Christopher J Stromberg
- Department of Chemistry and Physics, Hood College, 401 Rosemont Ave., Frederick, MD, 21701-8524, USA
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29
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Ashraf I, Konrad A, Lokstein H, Skandary S, Metzger M, Djouda JM, Maurer T, Adam PM, Meixner AJ, Brecht M. Temperature dependence of metal-enhanced fluorescence of photosystem I from Thermosynechococcus elongatus. NANOSCALE 2017; 9:4196-4204. [PMID: 28287218 DOI: 10.1039/c6nr08762k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the temperature dependence of metal-enhanced fluorescence (MEF) of individual photosystem I (PSI) complexes from Thermosynechococcus elongatus (T. elongatus) coupled to gold nanoparticles (AuNPs). A strong temperature dependence of shape and intensity of the emission spectra is observed when PSI is coupled to AuNPs. For each temperature, the enhancement factor (EF) is calculated by comparing the intensity of individual AuNP-coupled PSI to the mean intensity of 'uncoupled' PSI. At cryogenic temperature (1.6 K) the average EF was 4.3-fold. Upon increasing the temperature to 250 K the EF increases to 84-fold. Single complexes show even higher EFs up to 441.0-fold. At increasing temperatures the different spectral pools of PSI from T. elongatus become distinguishable. These pools are affected differently by the plasmonic interactions and show different enhancements. The remarkable increase of the EFs is explained by a rate model including the temperature dependence of the fluorescence yield of PSI and the spectral overlap between absorption and emission spectra of AuNPs and PSI, respectively.
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Affiliation(s)
- Imran Ashraf
- IPTC and LISA+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
| | - Alexander Konrad
- IPTC and LISA+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
| | - Heiko Lokstein
- Department of Chemical Physics and Optics, Charles University, Ke Karlovu 3, 12116 Prague, Czech Republic
| | - Sepideh Skandary
- IPTC and LISA+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
| | - Michael Metzger
- IPTC and LISA+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
| | - Joseph M Djouda
- Laboratory of Nanotechnology, Instrumentation and Optics, University of Technology of Troyes, 12 rue Marie Curie, 10004 Troyes, France
| | - Thomas Maurer
- Laboratory of Nanotechnology, Instrumentation and Optics, University of Technology of Troyes, 12 rue Marie Curie, 10004 Troyes, France
| | - Pierre M Adam
- Laboratory of Nanotechnology, Instrumentation and Optics, University of Technology of Troyes, 12 rue Marie Curie, 10004 Troyes, France
| | - Alfred J Meixner
- IPTC and LISA+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
| | - Marc Brecht
- IPTC and LISA+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
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30
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Raeeszadeh-Sarmazdeh M, Parthasarathy R, Boder ET. Fine-tuning sortase-mediated immobilization of protein layers on surfaces using sequential deprotection and coupling. Biotechnol Prog 2017; 33:824-831. [PMID: 28218499 DOI: 10.1002/btpr.2449] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 02/08/2017] [Indexed: 12/23/2022]
Abstract
Increasing interest in protein immobilization on surfaces has heightened the need for techniques enabling layer-by-layer protein attachment. Here, we report a technique for controlling enzyme-mediated immobilization of layers of protein on the surface using a genetically encoded protecting group. An enterokinase-cleavable peptide sequence was inserted at the N-terminus of bifunctional fluorescent proteins containing Sortase A substrate recognition tags at both ends to control Sortase A-mediated protein immobilization on the surface layer-by-layer. Efficient, sequential immobilization of a second layer of protein using Sortase A required removal of the N-terminal protecting group, suggesting the method enables multilayer synthesis using cyclic deprotection and coupling steps. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:824-831, 2017.
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Affiliation(s)
| | | | - Eric T Boder
- Dept. of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996
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31
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Puig S, Ganigué R, Batlle-Vilanova P, Balaguer MD, Bañeras L, Colprim J. Tracking bio-hydrogen-mediated production of commodity chemicals from carbon dioxide and renewable electricity. BIORESOURCE TECHNOLOGY 2017; 228:201-209. [PMID: 28063363 DOI: 10.1016/j.biortech.2016.12.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 12/08/2016] [Accepted: 12/09/2016] [Indexed: 05/28/2023]
Abstract
This study reveals that reduction of carbon dioxide (CO2) to commodity chemicals can be functionally compartmentalized in bioelectrochemical systems. In the present example, a syntrophic consortium composed by H2-producers (Rhodobacter sp.) in the biofilm is combined with carboxidotrophic Clostridium species, mainly found in the bulk liquid. The performance of these H2-mediated electricity-driven systems could be tracked by the activity of a biological H2 sensory protein identified at cathode potentials between -0.2V and -0.3V vs SHE. This seems to point out that such signal is not strain specific, but could be detected in any organism containing hydrogenases. Thus, the findings of this work open the door to the development of a biosensor application or soft sensors for monitoring such systems.
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Affiliation(s)
- Sebastià Puig
- LEQUIA, Institute of the Environment, University of Girona, Campus de Montilivi, Carrer Maria Aurèlia Capmany, 69, E-17003 Girona, Catalonia, Spain.
| | - Ramon Ganigué
- LEQUIA, Institute of the Environment, University of Girona, Campus de Montilivi, Carrer Maria Aurèlia Capmany, 69, E-17003 Girona, Catalonia, Spain; Centre of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Pau Batlle-Vilanova
- LEQUIA, Institute of the Environment, University of Girona, Campus de Montilivi, Carrer Maria Aurèlia Capmany, 69, E-17003 Girona, Catalonia, Spain; Department of Innovation and Technology, FCC Aqualia, Balmes Street, 36, 6th Floor, 08007 Barcelona, Spain
| | - M Dolors Balaguer
- LEQUIA, Institute of the Environment, University of Girona, Campus de Montilivi, Carrer Maria Aurèlia Capmany, 69, E-17003 Girona, Catalonia, Spain
| | - Lluís Bañeras
- Molecular Microbial Ecology Group, Institute of Aquatic Ecology, University of Girona, E-17071 Girona, Spain
| | - Jesús Colprim
- LEQUIA, Institute of the Environment, University of Girona, Campus de Montilivi, Carrer Maria Aurèlia Capmany, 69, E-17003 Girona, Catalonia, Spain
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32
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Reeve HA, Ash PA, Park H, Huang A, Posidias M, Tomlinson C, Lenz O, Vincent KA. Enzymes as modular catalysts for redox half-reactions in H2-powered chemical synthesis: from biology to technology. Biochem J 2017; 474:215-230. [PMID: 28062838 PMCID: PMC5298933 DOI: 10.1042/bcj20160513] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/11/2016] [Accepted: 11/15/2016] [Indexed: 11/17/2022]
Abstract
The present study considers the ways in which redox enzyme modules are coupled in living cells for linking reductive and oxidative half-reactions, and then reviews examples in which this concept can be exploited technologically in applications of coupled enzyme pairs. We discuss many examples in which enzymes are interfaced with electronically conductive particles to build up heterogeneous catalytic systems in an approach which could be termed synthetic biochemistry We focus on reactions involving the H+/H2 redox couple catalysed by NiFe hydrogenase moieties in conjunction with other biocatalysed reactions to assemble systems directed towards synthesis of specialised chemicals, chemical building blocks or bio-derived fuel molecules. We review our work in which this approach is applied in designing enzyme-modified particles for H2-driven recycling of the nicotinamide cofactor NADH to provide a clean cofactor source for applications of NADH-dependent enzymes in chemical synthesis, presenting a combination of published and new work on these systems. We also consider related photobiocatalytic approaches for light-driven production of chemicals or H2 as a fuel. We emphasise the techniques available for understanding detailed catalytic properties of the enzymes responsible for individual redox half-reactions, and the importance of a fundamental understanding of the enzyme characteristics in enabling effective applications of redox biocatalysis.
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Affiliation(s)
- Holly A Reeve
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Philip A Ash
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - HyunSeo Park
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Ailun Huang
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Michalis Posidias
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Chloe Tomlinson
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K
| | - Oliver Lenz
- Department of Chemistry, Technische Universität Berlin, Berlin 10623, Germany
| | - Kylie A Vincent
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, U.K.
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33
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Yang S, Robinson MT, Mwambutsa F, Cliffel DE, Jennings G. Effect of Cross-linking on the Performance and Stability of Photocatalytic Photosystem I Films. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.059] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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34
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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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35
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Soltau SR, Dahlberg PD, Niklas J, Poluektov OG, Mulfort KL, Utschig LM. Ru-protein-Co biohybrids designed for solar hydrogen production: understanding electron transfer pathways related to photocatalytic function. Chem Sci 2016; 7:7068-7078. [PMID: 28451142 PMCID: PMC5355951 DOI: 10.1039/c6sc03121h] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 08/05/2016] [Indexed: 12/12/2022] Open
Abstract
Two ruthenium-protein-cobaloxime biohybrids produce photocatalytic hydrogen through different catalytic pathways characterized by EPR and transient optical spectroscopies.
A series of Ru–protein–Co biohybrids have been prepared using the electron transfer proteins ferredoxin (Fd) and flavodoxin (Fld) as scaffolds for photocatalytic hydrogen production. The light-generated charge separation within these hybrids has been monitored by transient optical and electron paramagnetic resonance spectroscopies. Two distinct electron transfer pathways are observed. The Ru–Fd–Co biohybrid produces up to 650 turnovers of H2 utilizing an oxidative quenching mechanism for Ru(ii)* and a sequential electron transfer pathway via the native [2Fe–2S] cluster to generate a Ru(iii)–Fd–Co(i) charge separated state that lasts for ∼6 ms. In contrast, a direct electron transfer pathway occurs for the Ru–ApoFld–Co biohybrid, which lacks an internal electron relay, generating Ru(i)–ApoFld–Co(i) charge separated state that persists for ∼800 μs and produces 85 turnovers of H2 by a reductive quenching mechanism for Ru(ii)*. This work demonstrates the utility of protein architectures for linking donor and catalytic function via direct or sequential electron transfer pathways to enable stabilized charge separation which facilitates photocatalysis for solar fuel production.
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Affiliation(s)
- Sarah R Soltau
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA . ; Tel: +1-630-252-3544
| | - Peter D Dahlberg
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA . ; Tel: +1-630-252-3544.,Graduate Program in Biophysics , The University of Chicago , Chicago , IL 60637 , USA
| | - Jens Niklas
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA . ; Tel: +1-630-252-3544
| | - Oleg G Poluektov
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA . ; Tel: +1-630-252-3544
| | - Karen L Mulfort
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA . ; Tel: +1-630-252-3544
| | - Lisa M Utschig
- Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL 60439 , USA . ; Tel: +1-630-252-3544
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36
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Abstract
Photosynthetic reaction center (RC) proteins convert incident solar energy to chemical energy through a network of molecular cofactors which have been evolutionarily tuned to couple efficient light-harvesting, directional electron transfer, and long-lived charge separation with secondary reaction sequences. These molecular cofactors are embedded within a complex protein environment which precisely positions each cofactor in optimal geometries along efficient electron transfer pathways with localized protein environments facilitating sequential and accumulative charge transfer. By contrast, it is difficult to approach a similar level of structural complexity in synthetic architectures for solar energy conversion. However, by using appropriate self-assembly strategies, we anticipate that molecular modules, which are independently synthesized and optimized for either light-harvesting or redox catalysis, can be organized into spatial arrangements that functionally mimic natural photosynthesis. In this Account, we describe a modular approach to new structural designs for artificial photosynthesis which is largely inspired by photosynthetic RC proteins. We focus on recent work from our lab which uses molecular modules for light-harvesting or proton reduction catalysis in different coordination geometries and different platforms, spanning from discrete supramolecular assemblies to molecule-nanoparticle hybrids to protein-based biohybrids. Molecular modules are particularly amenable to high-resolution characterization of the ground and excited state of each module using a variety of physical techniques; such spectroscopic interrogation helps our understanding of primary artificial photosynthetic mechanisms. In particular, we discuss the use of transient optical spectroscopy, EPR, and X-ray scattering techniques to elucidate dynamic structural behavior and light-induced kinetics and the impact on photocatalytic mechanism. Two different coordination geometries of supramolecular photocatalyst based on the [Ru(bpy)3](2+) (bpy = 2,2'-bipyridine) light-harvesting module with cobaloxime-based catalyst module are compared, with progress in stabilizing photoinduced charge separation identified. These same modules embedded in the small electron transfer protein ferredoxin exhibit much longer charge-separation, enabled by stepwise electron transfer through the native [2Fe-2S] cofactor. We anticipate that the use of interchangeable, molecular modules which can interact in different coordination geometries or within entirely different structural platforms will provide important fundamental insights into the effect of environment on parameters such as electron transfer and charge separation, and ultimately drive more efficient designs for artificial photosynthesis.
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Affiliation(s)
- Karen L. Mulfort
- Division of Chemical Sciences
and Engineering, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Lisa M. Utschig
- Division of Chemical Sciences
and Engineering, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
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37
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Harris BJ, Cheng X, Frymier P. Structure and Function of Photosystem I–[FeFe] Hydrogenase Protein Fusions: An All-Atom Molecular Dynamics Study. J Phys Chem B 2016; 120:599-609. [DOI: 10.1021/acs.jpcb.5b07812] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bradley J. Harris
- College
of Engineering and Computer Science, University of Tennessee, Chattanooga, Tennessee 37403, United States
| | - Xiaolin Cheng
- Center for
Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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38
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Applegate AM, Lubner CE, Knörzer P, Happe T, Golbeck JH. Quantum yield measurements of light-induced H₂ generation in a photosystem I-[FeFe]-H₂ase nanoconstruct. PHOTOSYNTHESIS RESEARCH 2016; 127:5-11. [PMID: 25527460 DOI: 10.1007/s11120-014-0064-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 12/01/2014] [Indexed: 06/04/2023]
Abstract
The quantum yield for light-induced H2 generation was measured for a previously optimized bio-hybrid cytochrome c 6-crosslinked PSI(C13G)-1,8-octanedithiol-[FeFe]-H2ase(C97G) (PSI-H2ase) nanoconstruct. The theoretical quantum yield for the PSI-H2ase nanoconstruct is 0.50 molecules of H2 per photon absorbed, which equates to a requirement of two photons per H2 generated. Illumination of the PSI-H2ase nanoconstruct with visible light between 400 and 700 nm resulted in an average quantum yield of 0.10-0.15 molecules of H2 per photon absorbed, which equates to a requirement of 6.7-10 photons per H2 generated. A possible reason for the difference between the theoretical and experimental quantum yield is the occurrence of non-productive PSI(C13G)-1,8-octanedithiol-PSIC13G (PSI-PSI) conjugates, which would absorb light without generating H2. Assuming the thiol-Fe coupling is equally efficient at producing PSI-PSI conjugates as well as in producing PSI-H2ase nanoconstructs, the theoretical quantum yield would decrease to 0.167 molecules of H2 per photon absorbed, which equates to 6 photons per H2 generated. This value is close to the range of measured values in the current study. A strategy that purifies the PSI-H2ase nanoconstructs from the unproductive PSI-PSI conjugates or that incorporates different chemistries on the PSI and [FeFe]-H2ase enzyme sites could potentially allow the PSI-H2ase nanoconstruct to approach the expected theoretical quantum yield for light-induced H2 generation.
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Affiliation(s)
- Amanda M Applegate
- Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Carolyn E Lubner
- Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Philipp Knörzer
- Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie, Ruhr-Universität Bochum, 44780, Bochum, Germany
| | - Thomas Happe
- Lehrstuhl für Biochemie der Pflanzen, AG Photobiotechnologie, Ruhr-Universität Bochum, 44780, Bochum, Germany
| | - John H Golbeck
- Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA.
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, 16802, USA.
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39
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Gordiichuk PI, Rimmerman D, Paul A, Gautier DA, Gruszka A, Saller M, de Vries JW, Wetzelaer GJAH, Manca M, Gomulya W, Matmor M, Gloukhikh E, Loznik M, Ashkenasy N, Blom PWM, Rögner M, Loi MA, Richter S, Herrmann A. Filling the Green Gap of a Megadalton Photosystem I Complex by Conjugation of Organic Dyes. Bioconjug Chem 2015; 27:36-41. [DOI: 10.1021/acs.bioconjchem.5b00583] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Dolev Rimmerman
- The
Bio and Molecular Electronics Group, Department of Materials Science
and Engineering, Faculty of Engineering and University Center for
Nano Science and Nanotechnology, Tel Aviv University, Tel-Aviv, 69978, Israel
| | | | | | | | | | | | | | | | | | - Maayan Matmor
- Department
of Materials Engineering and the Ilze Katz Institute for Nanoscale
Science and Technology, Ben Gurion University of the Negev, Beer-Sheva, Israel
| | - Ekaterina Gloukhikh
- The
Bio and Molecular Electronics Group, Department of Materials Science
and Engineering, Faculty of Engineering and University Center for
Nano Science and Nanotechnology, Tel Aviv University, Tel-Aviv, 69978, Israel
| | | | - Nurit Ashkenasy
- Department
of Materials Engineering and the Ilze Katz Institute for Nanoscale
Science and Technology, Ben Gurion University of the Negev, Beer-Sheva, Israel
| | - Paul W. M. Blom
- Molecular
Electronics Group, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Matthias Rögner
- Plant Biochemistry, Ruhr University Bochum, D-44780 Bochum, Germany
| | | | - Shachar Richter
- The
Bio and Molecular Electronics Group, Department of Materials Science
and Engineering, Faculty of Engineering and University Center for
Nano Science and Nanotechnology, Tel Aviv University, Tel-Aviv, 69978, Israel
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40
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Hydrogen production at high Faradaic efficiency by a bio-electrode based on TiO2 adsorption of a new [FeFe]-hydrogenase from Clostridium perfringens. Bioelectrochemistry 2015; 106:258-62. [DOI: 10.1016/j.bioelechem.2015.08.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 08/05/2015] [Accepted: 08/07/2015] [Indexed: 11/20/2022]
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41
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Weingarten AS, Kazantsev RV, Palmer LC, Fairfield DJ, Koltonow AR, Stupp SI. Supramolecular Packing Controls H₂ Photocatalysis in Chromophore Amphiphile Hydrogels. J Am Chem Soc 2015; 137:15241-6. [PMID: 26593389 PMCID: PMC4676032 DOI: 10.1021/jacs.5b10027] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
Light harvesting supramolecular assemblies
are potentially useful
structures as components of solar-to-fuel conversion materials. The
development of these functional constructs requires an understanding
of optimal packing modes for chromophores. We investigated here assembly
in water and the photocatalytic function of perylene monoimide chromophore
amphiphiles with different alkyl linker lengths separating their hydrophobic
core and the hydrophilic carboxylate headgroup. We found that these
chromophore amphiphiles (CAs) self-assemble into charged nanostructures
of increasing aspect ratio as the linker length is increased. The
addition of salt to screen the charged nanostructures induced the
formation of hydrogels and led to internal crystallization within
some of the nanostructures. For linker lengths up to seven methylenes,
the CAs were found to pack into 2D crystalline unit cells within ribbon-shaped
nanostructures, whereas the nine methylene CAs assembled into long
nanofibers without crystalline molecular packing. At the same time,
the different molecular packing arrangements after charge screening
led to different absorbance spectra, despite the identical electronic
properties of all PMI amphiphiles. While the crystalline CAs formed
electronically coupled H-aggregates, only CAs with intermediate linker
lengths showed evidence of high intermolecular orbital overlap. Photocatalytic
hydrogen production using a nickel-based catalyst was observed in
all hydrogels, with the highest turnovers observed for CA gels having
intermediate linker lengths. We conclude that the improved photocatalytic
performance of the hydrogels formed by supramolecular assemblies of
the intermediate linker CA molecules likely arises from improved exciton
splitting efficiencies due to their higher orbital overlap.
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Affiliation(s)
- Adam S Weingarten
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208, United States
| | - Roman V Kazantsev
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208, United States
| | - Liam C Palmer
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Simpson Querrey Institute for BioNanotechnology, Northwestern University , Chicago, Illinois 60611, United States
| | - Daniel J Fairfield
- Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Andrew R Koltonow
- Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Samuel I Stupp
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208, United States.,Simpson Querrey Institute for BioNanotechnology, Northwestern University , Chicago, Illinois 60611, United States.,Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States.,Department of Medicine, Northwestern University , Chicago, Illinois 60611, United States.,Department of Biomedical Engineering, Northwestern University , Evanston, Illinois 60208, United States
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42
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Gorka M, Perez A, Baker CS, Ferlez B, van der Est A, Bryant DA, Golbeck JH. Electron transfer from the A1A and A1B sites to a tethered Pt nanoparticle requires the FeS clusters for suppression of the recombination channel. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 152:325-34. [DOI: 10.1016/j.jphotobiol.2015.08.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 08/09/2015] [Accepted: 08/13/2015] [Indexed: 11/17/2022]
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43
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Effects of Irregular Bimetallic Nanostructures on the Optical Properties of Photosystem I from Thermosynechococcus elongatus. PHOTONICS 2015. [DOI: 10.3390/photonics2030838] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Caputo CA, Wang L, Beranek R, Reisner E. Carbon nitride-TiO 2 hybrid modified with hydrogenase for visible light driven hydrogen production. Chem Sci 2015; 6:5690-5694. [PMID: 28757952 PMCID: PMC5512016 DOI: 10.1039/c5sc02017d] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 06/29/2015] [Indexed: 01/18/2023] Open
Abstract
A system consisting of a [NiFeSe]-hydrogenase (H2ase) grafted on the surface of a TiO2 nanoparticle modified with polyheptazine carbon nitride polymer, melon (CN x ) is reported. This semi-biological assembly shows a turnover number (TON) of more than 5.8 × 105 mol H2 (mol H2ase)-1 after 72 h in a sacrificial electron donor solution at pH 6 during solar AM 1.5 G irradiation. An external quantum efficiency up to 4.8% for photon-to-hydrogen conversion was achieved under irradiation with monochromatic light. The CN x -TiO2-H2ase construct was also active under UV-free solar light irradiation (λ > 420 nm), where it showed a substantially higher activity than TiO2-H2ase and CN x -H2ase due, in part, to the formation of a CN x -TiO2 charge transfer complex and highly productive electron transfer to the H2ase. The CN x -TiO2-H2ase system sets a new benchmark for photocatalytic H2 production with a H2ase immobilised on a noble- and toxic-metal free light absorber in terms of visible light utilisation and stability.
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Affiliation(s)
- Christine A Caputo
- Christian Doppler Laboratory for Sustainable SynGas Chemistry , Department of Chemistry , Cambridge University , Lensfied Road , Cambridge CB2 1EW , UK . ; http://www-reisner.ch.cam.ac.uk
| | - Lidong Wang
- Faculty of Chemistry and Biochemistry , Ruhr-Universität Bochum , Universitätsstraße 150 , 44780 Bochum , Germany
| | - Radim Beranek
- Faculty of Chemistry and Biochemistry , Ruhr-Universität Bochum , Universitätsstraße 150 , 44780 Bochum , Germany
| | - Erwin Reisner
- Christian Doppler Laboratory for Sustainable SynGas Chemistry , Department of Chemistry , Cambridge University , Lensfied Road , Cambridge CB2 1EW , UK . ; http://www-reisner.ch.cam.ac.uk
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Yan H, Catania C, Bazan GC. Membrane-intercalating conjugated oligoelectrolytes: impact on bioelectrochemical systems. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:2958-2973. [PMID: 25846107 DOI: 10.1002/adma.201500487] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Indexed: 06/04/2023]
Abstract
Conjugated oligoelectrolytes (COEs), molecules that are defined by a π-delocalized backbone and terminal ionic pendant groups, have been previously demonstrated to effectively reduce charge-injection/extraction barriers at metal/organic interfaces in thin-film organic-electronic devices. Recent studies demonstrate a spontaneous affinity of certain COEs to intercalate into, and align within, lipid bilayers in an ordered orientation, thereby allowing modification of membrane properties and the functions of microbes in bioelectrochemical and photosynthetic systems. Several reports have provided evidence of enhanced current generation and bioproduction. Mechanistic approaches suggest that COEs influence microbial extracellular electron transport to abiotic electrode surfaces via more than one proposed pathway, including direct electron transfer and meditated electron transfer. Molecular dynamics simulations as a function of molecular structure suggest that insertion of cationic COEs results in membrane thinning as the lipid phosphate head groups are drawn toward the center of the bilayer. Since variations in molecular structures, especially the length of the conjugated backbone, distribution of ionic groups, and hydrophobic substitutions, show an effect on their antimicrobial properties, preferential cell localization, and microbial selection, it is promising to further design novel membrane-intercalating molecules based on COEs for practical applications, including energy generation, environmental remediation, and antimicrobial treatment.
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Affiliation(s)
- Hengjing Yan
- Department of Chemistry and Biochemistry, Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Chelsea Catania
- Department of Materials, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Guillermo C Bazan
- Department of Chemistry and Biochemistry, Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
- Department of Materials, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
- King Abdulaziz University, Jeddah, Saudi Arabia
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46
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Work VH, Melnicki MR, Hill EA, Davies FK, Kucek LA, Beliaev AS, Posewitz MC. Lauric Acid Production in a Glycogen-Less Strain of Synechococcus sp. PCC 7002. Front Bioeng Biotechnol 2015; 3:48. [PMID: 25964950 PMCID: PMC4408914 DOI: 10.3389/fbioe.2015.00048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 03/25/2015] [Indexed: 12/04/2022] Open
Abstract
The cyanobacterium Synechococcus sp. Pasteur culture collection 7002 was genetically engineered to synthesize biofuel-compatible medium-chain fatty acids (FAs) during photoautotrophic growth. Expression of a heterologous lauroyl-acyl carrier protein (C12:0-ACP) thioesterase with concurrent deletion of the endogenous putative acyl-ACP synthetase led to secretion of transesterifiable C12:0 FA in CO2-supplemented batch cultures. When grown at steady state over a range of light intensities in a light-emitting diode turbidostat photobioreactor, the C12-secreting mutant exhibited a modest reduction in growth rate and increased O2 evolution relative to the wild-type (WT). Inhibition of (i) glycogen synthesis by deletion of the glgC-encoded ADP-glucose pyrophosphorylase (AGPase) and (ii) protein synthesis by nitrogen deprivation were investigated as potential mechanisms for metabolite redistribution to increase FA synthesis. Deletion of AGPase led to a 10-fold decrease in reducing carbohydrates and secretion of organic acids during nitrogen deprivation consistent with an energy spilling phenotype. When the carbohydrate-deficient background (ΔglgC) was modified for C12 secretion, no increase in C12 was achieved during nutrient replete growth, and no C12 was recovered from any strain upon nitrogen deprivation under the conditions used. At steady state, the growth rate of the ΔglgC strain saturated at a lower light intensity than the WT, but O2 evolution was not compromised and became increasingly decoupled from growth rate with rising irradiance. Photophysiological properties of the ΔglgC strain suggest energy dissipation from photosystem II and reconfiguration of electron flow at the level of the plastoquinone pool.
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Affiliation(s)
- Victoria H. Work
- Civil and Environmental Engineering Division, Colorado School of Mines, Golden, CO, USA
| | - Matthew R. Melnicki
- Microbiology Group, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Eric A. Hill
- Microbiology Group, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Fiona K. Davies
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO, USA
| | - Leo A. Kucek
- Microbiology Group, Pacific Northwest National Laboratory, Richland, WA, USA
| | | | - Matthew C. Posewitz
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO, USA
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47
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Fukuzumi S. Artificial photosynthetic systems for production of hydrogen. Curr Opin Chem Biol 2015; 25:18-26. [DOI: 10.1016/j.cbpa.2014.12.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Revised: 11/29/2014] [Accepted: 12/02/2014] [Indexed: 11/28/2022]
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48
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Shah VB, Henson WR, Chadha TS, Lakin G, Liu H, Blankenship RE, Biswas P. Linker-free deposition and adhesion of Photosystem I onto nanostructured TiO2 for biohybrid photoelectrochemical cells. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1675-1682. [PMID: 25540979 DOI: 10.1021/la503776b] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Photosystem I (PSI) from oxygenic photosynthetic organisms is an attractive sensitizer for nano-biohybrid solar cells as it has a combined light-harvesting and reaction center in one protein complex and operates at a quantum yield close to one in biological systems. Using a linker-free deposition technique enabled by an electrospray system, PSI was coupled to 1-D nanostructured titanium dioxide thin films to fabricate an electrode for a photoelectrochemical cell. After deposition, the surfactant in the PSI aggregate was dissolved in the surfactant-free electrolyte, ensuring that partly hydrophobic PSI was not resuspended and stayed in contact with titanium dioxide. A maximum current density of 4.15 mA cm(-2) was measured after 10 min of electrospray deposition, and this is the highest current density reported so far for PSI-based photoelectrochemical cells. The high current is attributed to 1D nanostructure of titanium dioxide and orientation of the PSI onto the surface, which allows easy transfer of electrons.
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Affiliation(s)
- Vivek B Shah
- Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental and Chemical Engineering, ‡Departments of Biology and Chemistry, and §Photosynthetic Antenna Research Center, Washington University in St. Louis , St. Louis, Missouri 63130, United States
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49
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Le RK, Raeeszadeh-Sarmazdeh M, Boder ET, Frymier PD. Sortase-mediated ligation of PsaE-modified photosystem I from Synechocystis sp. PCC 6803 to a conductive surface for enhanced photocurrent production on a gold electrode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1180-1188. [PMID: 25535846 DOI: 10.1021/la5031284] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Sortase-mediated ligation was used to attach the photosystem I (PSI) complex from Synechocystis sp. PCC 6803 in a preferential orientation to enhance photoinduced electron flow to a conductive gold surface. Ideally, this method can result in a uniform monolayer of protein, covalently bound unidirectionally to the electrode surface. The exposed C-termini of the psaE subunits of the PSI trimer were targeted to contain an LPETG-sortase recognition sequence to increase noncompeting electron transfer by uniformly orienting the PSI stromal side proximal to the surface. Surface characterization with atomic force microscopy suggested that monolayer formation and optimal surface coverage occurred when the gold surfaces were incubated with peptide at 100 to 500 μM concentrations. When photochronoamperometry with potassium ferrocyanide and ferricyanide as redox mediators was used, photocurrents in the range of 100 to 200 nA/cm(2) were produced, which is an improvement over other attachment techniques for photosystem monolayers that produce approximately 100 nA/cm(2) or less. This work demonstrated that sortase-mediated ligation aided in the control of PSI orientation on modified gold surfaces with a distribution of 94% stromal side proximal and 6% lumenal side proximal to the surface for current-producing PSI.
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Affiliation(s)
- Rosemary K Le
- Department of Chemical and Biomolecular Engineering, ‡Institute for Biomedical Engineering, and §Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee-Knoxville , Knoxville, Tennessee 37966-2200, United States
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50
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Utschig LM, Soltau SR, Tiede DM. Light-driven hydrogen production from Photosystem I-catalyst hybrids. Curr Opin Chem Biol 2014; 25:1-8. [PMID: 25500176 DOI: 10.1016/j.cbpa.2014.11.019] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 11/20/2014] [Accepted: 11/23/2014] [Indexed: 11/26/2022]
Abstract
Solar energy conversion of water into environmentally clean fuels, such as hydrogen, offers one of the best long-term solutions for meeting future global energy needs. In photosynthesis, high quantum yield charge separation is achieved by a series of rapid, photoinitiated electron transfer steps that take place in proteins called reaction centers (RCs). Of current interest are new strategies that couple RC photochemistry to the direct synthesis of energy-rich molecules, offering opportunities to more directly tune the products of photosynthesis and potentially to increase solar energy conversion capacity. Innovative designs link RC photochemistry with synthetic molecular catalysts to create earth abundant biohybrid complexes that use light to rapidly produce hydrogen from water.
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Affiliation(s)
- Lisa M Utschig
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, United States.
| | - Sarah R Soltau
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, United States
| | - David M Tiede
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, United States
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