1
|
Reiter S, Gordiy I, Kollmannsberger KL, Liu F, Thyrhaug E, Leister D, Warnan J, Hauer J, de Vivie-Riedle R. Molecular interactions of photosystem I and ZIF-8 in bio-nanohybrid materials. Phys Chem Chem Phys 2024; 26:23228-23239. [PMID: 39192757 DOI: 10.1039/d4cp03021d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
Bio-nanohybrid devices featuring natural photocatalysts bound to a nanostructure hold great promise in the search for sustainable energy conversion. One of the major challenges of integrating biological systems is protecting them against harsh environmental conditions while retaining, or ideally enhancing their photophysical properties. In this mainly computational work we investigate an assembly of cyanobacterial photosystem I (PS I) embedded in a metal-organic framework (MOF), namely the zeolitic imidazolate framework ZIF-8. This complex has been reported experimentally [Bennett et al., Nanoscale Adv., 2019, 1, 94] but so far the molecular interactions between PS I and the MOF remained elusive. We show via absorption spectroscopy that PS I remains intact throughout the encapsulation-release cycle. Molecular dynamics (MD) simulations further confirm that the encapsulation has no noticeable structural impact on the photosystem. However, the MOF building blocks frequently coordinate to the Mg2+ ions of chlorophylls in the periphery of the antenna complex. High-level quantum mechanical calculations reveal charge-transfer interactions, which affect the excitonic network and thereby may reversibly change the fluorescence properties of PS I. Nevertheless, our results highlight the stability of PS I in the MOF, as the reaction center remains unimpeded by the heterogeneous environment, paving the way for applications in the foreseeable future.
Collapse
Affiliation(s)
- Sebastian Reiter
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 11, 81377 Munich, Germany.
| | - Igor Gordiy
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 11, 81377 Munich, Germany.
| | - Kathrin L Kollmannsberger
- Chair of Inorganic and Metal-Organic Chemistry, Department of Chemistry and Catalysis Research Center (CRC), TUM School of Natural Sciences, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Feng Liu
- Faculty of Biology, Ludwig-Maximilians-Universität München, Großhaderner Str. 2-4, 82152 Planegg-Martinsried, Germany
| | - Erling Thyrhaug
- Professorship of Dynamic Spectroscopy, Department of Chemistry and Catalysis Research Center (CRC), TUM School of Natural Sciences, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany.
| | - Dario Leister
- Faculty of Biology, Ludwig-Maximilians-Universität München, Großhaderner Str. 2-4, 82152 Planegg-Martinsried, Germany
| | - Julien Warnan
- Chair of Inorganic and Metal-Organic Chemistry, Department of Chemistry and Catalysis Research Center (CRC), TUM School of Natural Sciences, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Jürgen Hauer
- Professorship of Dynamic Spectroscopy, Department of Chemistry and Catalysis Research Center (CRC), TUM School of Natural Sciences, Technical University of Munich, Lichtenbergstr. 4, 85748 Garching, Germany.
| | - Regina de Vivie-Riedle
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 11, 81377 Munich, Germany.
| |
Collapse
|
2
|
Montgomery TL, Wang Q, Mirza A, Dwyer D, Wu Q, Dowling CA, Martens JWS, Yang J, Krementsov DN, Mao-Draayer Y. Identification of commensal gut microbiota signatures as predictors of clinical severity and disease progression in multiple sclerosis. Sci Rep 2024; 14:15292. [PMID: 38961134 PMCID: PMC11222390 DOI: 10.1038/s41598-024-64369-x] [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: 12/21/2023] [Accepted: 06/07/2024] [Indexed: 07/05/2024] Open
Abstract
Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system and a leading cause of neurological disability in young adults. Clinical presentation and disease course are highly heterogeneous. Typically, disease progression occurs over time and is characterized by the gradual accumulation of disability. The risk of developing MS is driven by complex interactions between genetic and environmental factors, including the gut microbiome. How the commensal gut microbiota impacts disease severity and progression over time remains unknown. In a longitudinal study, disability status and associated clinical features in 58 MS patients were tracked over 4.2 ± 0.98 years, and the baseline fecal gut microbiome was characterized via 16S amplicon sequencing. Progressor status, defined as patients with an increase in Expanded Disability Status Scale (EDSS), were correlated with features of the gut microbiome to determine candidate microbiota associated with risk of MS disease progression. We found no overt differences in microbial community diversity and overall structure between MS patients exhibiting disease progression and non-progressors. However, a total of 41 bacterial species were associated with worsening disease, including a marked depletion in Akkermansia, Lachnospiraceae, and Oscillospiraceae, with an expansion of Alloprevotella, Prevotella-9, and Rhodospirillales. Analysis of the metabolic potential of the inferred metagenome from taxa associated with progression revealed enrichment in oxidative stress-inducing aerobic respiration at the expense of microbial vitamin K2 production (linked to Akkermansia), and a depletion in SCFA metabolism (linked to Oscillospiraceae). Further, as a proof of principle, statistical modeling demonstrated that microbiota composition and clinical features were sufficient to predict disease progression. Additionally, we found that constipation, a frequent gastrointestinal comorbidity among MS patients, exhibited a divergent microbial signature compared with progressor status. These results demonstrate a proof of principle for the utility of the gut microbiome for predicting disease progression in MS in a small well-defined cohort. Further, analysis of the inferred metagenome suggested that oxidative stress, vitamin K2, and SCFAs are associated with progression, warranting future functional validation and mechanistic study.
Collapse
Affiliation(s)
- Theresa L Montgomery
- Department of Biomedical and Health Sciences, University of Vermont, Burlington, VT, 05401, USA
| | - Qin Wang
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Ali Mirza
- Pharmacoepidemiology in Multiple Sclerosis Research Group, The University of British Columbia, Vancouver, BC, V6T 2B5, Canada
| | - Deanna Dwyer
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Qi Wu
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Catherine A Dowling
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Jacob W S Martens
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Jennifer Yang
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Dimitry N Krementsov
- Department of Biomedical and Health Sciences, University of Vermont, Burlington, VT, 05401, USA.
| | - Yang Mao-Draayer
- Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, 48109, USA.
- Autoimmunity Center of Excellence, Multiple Sclerosis Center of Excellence, Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA.
| |
Collapse
|
3
|
Elias E, Oliver TJ, Croce R. Oxygenic Photosynthesis in Far-Red Light: Strategies and Mechanisms. Annu Rev Phys Chem 2024; 75:231-256. [PMID: 38382567 DOI: 10.1146/annurev-physchem-090722-125847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Oxygenic photosynthesis, the process that converts light energy into chemical energy, is traditionally associated with the absorption of visible light by chlorophyll molecules. However, recent studies have revealed a growing number of organisms capable of using far-red light (700-800 nm) to drive oxygenic photosynthesis. This phenomenon challenges the conventional understanding of the limits of this process. In this review, we briefly introduce the organisms that exhibit far-red photosynthesis and explore the different strategies they employ to harvest far-red light. We discuss the modifications of photosynthetic complexes and their impact on the delivery of excitation energy to photochemical centers and on overall photochemical efficiency. Finally, we examine the solutions employed to drive electron transport and water oxidation using relatively low-energy photons. The findings discussed here not only expand our knowledge of the remarkable adaptation capacities of photosynthetic organisms but also offer insights into the potential for enhancing light capture in crops.
Collapse
Affiliation(s)
- Eduard Elias
- Department of Physics and Astronomy, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands;
| | - Thomas J Oliver
- Department of Physics and Astronomy, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands;
| | - Roberta Croce
- Department of Physics and Astronomy, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands;
| |
Collapse
|
4
|
Santabarbara S, Agostini A, Petrova AA, Bortolus M, Casazza AP, Carbonera D. Chlorophyll triplet states in thylakoid membranes of Acaryochloris marina. Evidence for a triplet state sitting on the photosystem I primary donor populated by intersystem crossing. PHOTOSYNTHESIS RESEARCH 2024; 159:133-152. [PMID: 37191762 DOI: 10.1007/s11120-023-01023-z] [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: 03/16/2023] [Accepted: 04/27/2023] [Indexed: 05/17/2023]
Abstract
Photo-induced triplet states in the thylakoid membranes isolated from the cyanobacterium Acaryocholoris marina, that harbours Chlorophyll (Chl) d as its main chromophore, have been investigated by Optically Detected Magnetic Resonance (ODMR) and time-resolved Electron Paramagnetic Resonance (TR-EPR). Thylakoids were subjected to treatments aimed at poising the redox state of the terminal electron transfer acceptors and donors of Photosystem II (PSII) and Photosystem I (PSI), respectively. Under ambient redox conditions, four Chl d triplet populations were detectable, identifiable by their characteristic zero field splitting parameters, after deconvolution of the Fluorescence Detected Magnetic Resonance (FDMR) spectra. Illumination in the presence of the redox mediator N,N,N',N'-Tetramethyl-p-phenylenediamine (TMPD) and sodium ascorbate at room temperature led to a redistribution of the triplet populations, with T3 (|D|= 0.0245 cm-1, |E|= 0.0042 cm-1) becoming dominant and increasing in intensity with respect to untreated samples. A second triplet population (T4, |D|= 0.0248 cm-1, |E|= 0.0040 cm-1) having an intensity ratio of about 1:4 with respect to T3 was also detectable after illumination in the presence of TMPD and ascorbate. The microwave-induced Triplet-minus-Singlet spectrum acquired at the maximum of the |D|-|E| transition (610 MHz) displays a broad minimum at 740 nm, accompanied by a set of complex spectral features that overall resemble, despite showing further fine spectral structure, the previously reported Triplet-minus-Singlet spectrum attributed to the recombination triplet of PSI reaction centre,3 P 740 [Schenderlein M, Çetin M, Barber J, et al. Spectroscopic studies of the chlorophyll d containing photosystem I from the cyanobacterium Acaryochloris marina. Biochim Biophys Acta 1777:1400-1408]. However, TR-EPR experiments indicate that this triplet displays an eaeaea electron spin polarisation pattern which is characteristic of triplet sublevels populated by intersystem crossing rather than recombination, for which an aeeaae polarisation pattern is expected instead. It is proposed that the observed triplet, which leads to the bleaching of the P740 singlet state, sits on the PSI reaction centre.
Collapse
Affiliation(s)
- Stefano Santabarbara
- Photosynthesis Research Unit, Centro Studi Sulla Biologia Cellulare e Molecolare delle Piante, Consiglio Nazionale Delle Ricerche, Via Celoria 26, 20133, Milan, Italy.
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, Via Bassini 15a, 20133, Milan, Italy.
| | - Alessandro Agostini
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, 35131, Padua, Italy
| | - Anastasia A Petrova
- Photosynthesis Research Unit, Centro Studi Sulla Biologia Cellulare e Molecolare delle Piante, Consiglio Nazionale Delle Ricerche, Via Celoria 26, 20133, Milan, Italy
- A. N. Belozersky Institute of Physical-Chemical Biology, Lomonosov Moscow State University, Leninskye Gory 1 Building 40, Moscow, Russia, 119992
| | - Marco Bortolus
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, 35131, Padua, Italy
| | - Anna Paola Casazza
- Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, Via Bassini 15a, 20133, Milan, Italy
| | - Donatella Carbonera
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, 35131, Padua, Italy.
| |
Collapse
|
5
|
Tikhonov AN. The cytochrome b 6f complex: plastoquinol oxidation and regulation of electron transport in chloroplasts. PHOTOSYNTHESIS RESEARCH 2024; 159:203-227. [PMID: 37369875 DOI: 10.1007/s11120-023-01034-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023]
Abstract
In oxygenic photosynthetic systems, the cytochrome b6f (Cytb6f) complex (plastoquinol:plastocyanin oxidoreductase) is a heart of the hub that provides connectivity between photosystems (PS) II and I. In this review, the structure and function of the Cytb6f complex are briefly outlined, being focused on the mechanisms of a bifurcated (two-electron) oxidation of plastoquinol (PQH2). In plant chloroplasts, under a wide range of experimental conditions (pH and temperature), a diffusion of PQH2 from PSII to the Cytb6f does not limit the intersystem electron transport. The overall rate of PQH2 turnover is determined mainly by the first step of the bifurcated oxidation of PQH2 at the catalytic site Qo, i.e., the reaction of electron transfer from PQH2 to the Fe2S2 cluster of the high-potential Rieske iron-sulfur protein (ISP). This point has been supported by the quantum chemical analysis of PQH2 oxidation within the framework of a model system including the Fe2S2 cluster of the ISP and surrounding amino acids, the low-potential heme b6L, Glu78 and 2,3,5-trimethylbenzoquinol (the tail-less analog of PQH2). Other structure-function relationships and mechanisms of electron transport regulation of oxygenic photosynthesis associated with the Cytb6f complex are briefly outlined: pH-dependent control of the intersystem electron transport and the regulatory balance between the operation of linear and cyclic electron transfer chains.
Collapse
Affiliation(s)
- Alexander N Tikhonov
- Department of Biophysics, Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russian Federation, 119991.
| |
Collapse
|
6
|
Montgomery TL, Wang Q, Mirza A, Dwyer D, Wu Q, Dowling CA, Martens JW, Yang J, Krementsov DN, Mao-Draayer Y. Identification of commensal gut microbiota signatures as predictors of clinical severity and disease progression in multiple sclerosis. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.06.26.23291875. [PMID: 37425956 PMCID: PMC10327224 DOI: 10.1101/2023.06.26.23291875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Background Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system and a leading cause of neurological disability in young adults. Clinical presentation and disease course are highly heterogeneous. Typically, disease progression occurs over time and is characterized by the gradual accumulation of disability. The risk of developing MS is driven by complex interactions between genetic and environmental factors, including the gut microbiome. How the commensal gut microbiota impacts disease severity and progression over time remains unknown. Methods In a longitudinal study, disability status and associated clinical features in 60 MS patients were tracked over 4.2 ± 0.97 years, and the baseline fecal gut microbiome was characterized via 16S amplicon sequencing. Progressor status, defined as patients with an increase in Expanded Disability Status Scale (EDSS), were correlated with features of the gut microbiome to determine candidate microbiota associated with risk of MS disease progression. Results We found no overt differences in microbial community diversity and overall structure between MS patients exhibiting disease progression and non-progressors. However, a total of 45 bacterial species were associated with worsening disease, including a marked depletion in Akkermansia , Lachnospiraceae, and Oscillospiraceae , with an expansion of Alloprevotella , Prevotella-9 , and Rhodospirillales . Analysis of the metabolic potential of the inferred metagenome from taxa associated with progression revealed a significant enrichment in oxidative stress-inducing aerobic respiration at the expense of microbial vitamin K 2 production (linked to Akkermansia ), and a depletion in SCFA metabolism (linked to Lachnospiraceae and Oscillospiraceae ). Further, statistical modeling demonstrated that microbiota composition and clinical features were sufficient to robustly predict disease progression. Additionally, we found that constipation, a frequent gastrointestinal comorbidity among MS patients, exhibited a divergent microbial signature compared with progressor status. Conclusions These results demonstrate the utility of the gut microbiome for predicting disease progression in MS. Further, analysis of the inferred metagenome revealed that oxidative stress, vitamin K 2 and SCFAs are associated with progression. Abstract Figure
Collapse
|
7
|
Yang Z, Wang J, Yin B, Liu W, Yin D, Shen J, Wang W, Li L, Guo X. Stimuli-Induced Subconformation Transformation of the PSI-LHCI Protein at Single-Molecule Resolution. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023:e2205945. [PMID: 37114832 DOI: 10.1002/advs.202205945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 04/11/2023] [Indexed: 06/19/2023]
Abstract
Photosynthesis is a very important process for the current biosphere which can maintain such a subtle and stable circulatory ecosystem on earth through the transformation of energy and substance. Even though been widely studied in various aspects, the physiological activities, such as intrinsic structural vibration and self-regulation process to stress of photosynthetic proteins, are still not in-depth resolved in real-time. Herein, utilizing silicon nanowire biosensors with ultrasensitive temporal and spatial resolution, real-time responses of a single photosystem I-light harvesting complex I (PSI-LHCI) supercomplex of Pisum sativum to various conditions, including gradient variations in temperature, illumination, and electric field, are recorded. Under different temperatures, there is a bi-state switch process associated with the intrinsic thermal vibration behavior. When the variations of illumination and the bias voltage are applied, two additional shoulder states, probably derived from the self-conformational adjustment, are observed. Based on real-time monitoring of the dynamic processes of the PSI-LHCI supercomplex under various conditions, it is successively testified to promising nanotechnology for protein profiling and biological functional integration in photosynthesis studies.
Collapse
Affiliation(s)
- Zhiheng Yang
- State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing, 100871, P. R. China
| | - Jie Wang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, P. R. China
| | - Bing Yin
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing, 100871, P. R. China
| | - Wenzhe Liu
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing, 100871, P. R. China
| | - Dongbao Yin
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing, 100871, P. R. China
| | - Jianren Shen
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, P. R. China
| | - Wenda Wang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, P. R. China
| | - Lidong Li
- State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China
| | - Xuefeng Guo
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing, 100871, P. R. China
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin, 300350, P. R. China
| |
Collapse
|
8
|
Manoj KM, Bazhin NM, Jacob VD, Parashar A, Gideon DA, Manekkathodi A. Structure-function correlations and system dynamics in oxygenic photosynthesis: classical perspectives and murburn precepts. J Biomol Struct Dyn 2022; 40:10997-11023. [PMID: 34323659 DOI: 10.1080/07391102.2021.1953606] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
HIGHLIGHTS Contemporary beliefs on oxygenic photosynthesis are critiqued.Murburn model is suggested as an alternative explanation.In the new model, diffusible reactive species are the main protagonists.All pigments are deemed photo-redox active in the new stochastic mechanism.NADPH synthesis occurs via simple electron transfers, not via elaborate ETC.Oxygenesis is delocalized and not just centered at Mn-Complex.Energetics of murburn proposal for photophosphorylation is provided.The proposal ushers in a paradigm shift in photosynthesis research.
Collapse
Affiliation(s)
| | | | - Vivian David Jacob
- Satyamjayatu: The Science & Ethics Foundation, Kulappully, Kerala, India
| | - Abhinav Parashar
- Satyamjayatu: The Science & Ethics Foundation, Kulappully, Kerala, India
| | | | - Afsal Manekkathodi
- Satyamjayatu: The Science & Ethics Foundation, Kulappully, Kerala, India
| |
Collapse
|
9
|
Teodor AH, Monge S, Aguilar D, Tames A, Nunez R, Gonzalez E, Rodríguez JJM, Bergkamp JJ, Starbird R, Renugopalakrishnan V, Bruce BD, Villarreal C. PEDOT-Carbon Nanotube Counter Electrodes and Bipyridine Cobalt (II/III) Mediators as Universally Compatible Components in Bio-Sensitized Solar Cells Using Photosystem I and Bacteriorhodopsin. Int J Mol Sci 2022; 23:3865. [PMID: 35409224 PMCID: PMC8998335 DOI: 10.3390/ijms23073865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/26/2022] [Accepted: 03/27/2022] [Indexed: 02/04/2023] Open
Abstract
In nature, solar energy is captured by different types of light harvesting protein-pigment complexes. Two of these photoactivatable proteins are bacteriorhodopsin (bR), which utilizes a retinal moiety to function as a proton pump, and photosystem I (PSI), which uses a chlorophyll antenna to catalyze unidirectional electron transfer. Both PSI and bR are well characterized biochemically and have been integrated into solar photovoltaic (PV) devices built from sustainable materials. Both PSI and bR are some of the best performing photosensitizers in the bio-sensitized PV field, yet relatively little attention has been devoted to the development of more sustainable, biocompatible alternative counter electrodes and electrolytes for bio-sensitized solar cells. Careful selection of the electrolyte and counter electrode components is critical to designing bio-sensitized solar cells with more sustainable materials and improved device performance. This work explores the use of poly (3,4-ethylenedioxythiophene) (PEDOT) modified with multi-walled carbon nanotubes (PEDOT/CNT) as counter electrodes and aqueous-soluble bipyridine cobaltII/III complexes as direct redox mediators for both PSI and bR devices. We report a unique counter electrode and redox mediator system that can perform remarkably well for both bio-photosensitizers that have independently evolved over millions of years. The compatibility of disparate proteins with common mediators and counter electrodes may further the improvement of bio-sensitized PV design in a way that is more universally biocompatible for device outputs and longevity.
Collapse
Affiliation(s)
- Alexandra H. Teodor
- Graduate School of Genome Science and Technology, University of Tennessee at Knoxville, Knoxville, TN 37996, USA;
| | - Stephanie Monge
- Escuela de Ciencia e Ingeniería de Materiales, Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica; (S.M.); (D.A.); (A.T.)
- Centro de Investigación y Extensión en Ingeniería de Materiales (CIEMTEC), Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica
- Maestría Ingeniería en Dispositivos Médicos, Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica
| | - Dariana Aguilar
- Escuela de Ciencia e Ingeniería de Materiales, Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica; (S.M.); (D.A.); (A.T.)
- Centro de Investigación y Extensión en Ingeniería de Materiales (CIEMTEC), Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica
| | - Alexandra Tames
- Escuela de Ciencia e Ingeniería de Materiales, Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica; (S.M.); (D.A.); (A.T.)
- Centro de Investigación y Extensión en Ingeniería de Materiales (CIEMTEC), Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica
| | - Roger Nunez
- Department of Chemistry and Biochemistry, California State University Bakersfield, Bakersfield, CA 93311, USA; (R.N.); (E.G.); (J.J.B.)
| | - Elaine Gonzalez
- Department of Chemistry and Biochemistry, California State University Bakersfield, Bakersfield, CA 93311, USA; (R.N.); (E.G.); (J.J.B.)
| | | | - Jesse J. Bergkamp
- Department of Chemistry and Biochemistry, California State University Bakersfield, Bakersfield, CA 93311, USA; (R.N.); (E.G.); (J.J.B.)
| | - Ricardo Starbird
- Centro de Investigación y de Servicios Químicos y Microbiológicos (CEQIATEC), Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica;
- Escuela de Química, Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica
| | - Venkatesan Renugopalakrishnan
- Children’s Hospital, Harvard Medical School, 4 Blackfan Circle, Boston, MA 02115, USA;
- Department of Chemistry and Chemical Biology, Center for Renewable Energy Technology, Northeastern University, 317 Egan Center, Boston, MA 02138, USA
| | - Barry D. Bruce
- Department of Biochemistry, Cellular, and Molecular Biology, University of Tennessee at Knoxville, Knoxville, TN 37996, USA
- Chemical and Biomolecular Engineering Department, University of Tennessee at Knoxville, Knoxville, TN 37996, USA
| | - Claudia Villarreal
- Escuela de Ciencia e Ingeniería de Materiales, Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica; (S.M.); (D.A.); (A.T.)
- Centro de Investigación y Extensión en Ingeniería de Materiales (CIEMTEC), Instituto Tecnológico de Costa Rica, Cartago 30101, Costa Rica
| |
Collapse
|
10
|
López-Ortiz M, Zamora RA, Giannotti MI, Hu C, Croce R, Gorostiza P. Distance and Potential Dependence of Charge Transport Through the Reaction Center of Individual Photosynthetic Complexes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2104366. [PMID: 34874621 DOI: 10.1002/smll.202104366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 11/11/2021] [Indexed: 06/13/2023]
Abstract
Charge separation and transport through the reaction center of photosystem I (PSI) is an essential part of the photosynthetic electron transport chain. A strategy is developed to immobilize and orient PSI complexes on gold electrodes allowing to probe the complex's electron acceptor side, the chlorophyll special pair P700. Electrochemical scanning tunneling microscopy (ECSTM) imaging and current-distance spectroscopy of single protein complex shows lateral size in agreement with its known dimensions, and a PSI apparent height that depends on the probe potential revealing a gating effect in protein conductance. In current-distance spectroscopy, it is observed that the distance-decay constant of the current between PSI and the ECSTM probe depends on the sample and probe electrode potentials. The longest charge exchange distance (lowest distance-decay constant β) is observed at sample potential 0 mV/SSC (SSC: reference electrode silver/silver chloride) and probe potential 400 mV/SSC. These potentials correspond to hole injection into an electronic state that is available in the absence of illumination. It is proposed that a pair of tryptophan residues located at the interface between P700 and the solution and known to support the hydrophobic recognition of the PSI redox partner plastocyanin, may have an additional role as hole exchange mediator in charge transport through PSI.
Collapse
Affiliation(s)
- Manuel López-Ortiz
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, Barcelona, 08028, Spain
- Network Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, 28029, Spain
| | - Ricardo A Zamora
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, Barcelona, 08028, Spain
- Network Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, 28029, Spain
| | - Marina Inés Giannotti
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, Barcelona, 08028, Spain
- Network Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, 28029, Spain
- Department of Materials Science and Physical Chemistry, University of Barcelona, Martí i Franquès 1-11, Barcelona, 08028, Spain
| | - Chen Hu
- Biophysics of PhotosynthesisDepartment of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, Amsterdam, 1081 HV, The Netherlands
| | - Roberta Croce
- Biophysics of PhotosynthesisDepartment of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, Amsterdam, 1081 HV, The Netherlands
| | - Pau Gorostiza
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, Barcelona, 08028, Spain
- Network Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, 28029, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, 08010, Spain
| |
Collapse
|
11
|
Gorka M, Baldansuren A, Malnati A, Gruszecki E, Golbeck JH, Lakshmi KV. Shedding Light on Primary Donors in Photosynthetic Reaction Centers. Front Microbiol 2021; 12:735666. [PMID: 34659164 PMCID: PMC8517396 DOI: 10.3389/fmicb.2021.735666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Accepted: 08/30/2021] [Indexed: 11/17/2022] Open
Abstract
Chlorophylls (Chl)s exist in a variety of flavors and are ubiquitous in both the energy and electron transfer processes of photosynthesis. The functions they perform often occur on the ultrafast (fs-ns) time scale and until recently, these have been difficult to measure in real time. Further, the complexity of the binding pockets and the resulting protein-matrix effects that alter the respective electronic properties have rendered theoretical modeling of these states difficult. Recent advances in experimental methodology, computational modeling, and emergence of new reaction center (RC) structures have renewed interest in these processes and allowed researchers to elucidate previously ambiguous functions of Chls and related pheophytins. This is complemented by a wealth of experimental data obtained from decades of prior research. Studying the electronic properties of Chl molecules has advanced our understanding of both the nature of the primary charge separation and subsequent electron transfer processes of RCs. In this review, we examine the structures of primary electron donors in Type I and Type II RCs in relation to the vast body of spectroscopic research that has been performed on them to date. Further, we present density functional theory calculations on each oxidized primary donor to study both their electronic properties and our ability to model experimental spectroscopic data. This allows us to directly compare the electronic properties of hetero- and homodimeric RCs.
Collapse
Affiliation(s)
- Michael Gorka
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, United States
| | - Amgalanbaatar Baldansuren
- Department of Chemistry and Chemical Biology and The Baruch ’60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Amanda Malnati
- Department of Chemistry and Chemical Biology and The Baruch ’60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Elijah Gruszecki
- Department of Chemistry and Chemical Biology and The Baruch ’60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - John H. Golbeck
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, United States
- Department of Chemistry, The Pennsylvania State University, University Park, PA, United States
| | - K. V. Lakshmi
- Department of Chemistry and Chemical Biology and The Baruch ’60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY, United States
| |
Collapse
|
12
|
In vivo electron donation from plastocyanin and cytochrome c 6 to PSI in Synechocystis sp. PCC6803. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2021; 1862:148449. [PMID: 34004195 DOI: 10.1016/j.bbabio.2021.148449] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 04/30/2021] [Accepted: 05/14/2021] [Indexed: 11/20/2022]
Abstract
Many cyanobacteria species can use both plastocyanin and cytochrome c6 as lumenal electron carriers to shuttle electrons from the cytochrome b6f to either photosystem I or the respiratory cytochrome c oxidase. In Synechocystis sp. PCC6803 placed in darkness, about 60% of the active PSI centres are bound to a reduced electron donor which is responsible for the fast re-reduction of P700in vivo after a single charge separation. Here, we show that both cytochrome c6 and plastocyanin can bind to PSI in the dark and participate to the fast phase of P700 reduction, but the fraction of pre-bound PSI is smaller in the case of cytochrome c6 than with plastocyanin. Because of the inter-connection of respiration and photosynthesis in cyanobacteria, the inhibition of the cytochrome c oxidase results in the over-reduction of the photosynthetic electron transfer chain in the dark that translates into a lag in the kinetics of P700 oxidation at the onset of light. We show that this is true both with plastocyanin and cytochrome c6, indicating that the partitioning of electron transport between respiration and photosynthesis is regulated in the same way independently of which of the two lumenal electron carriers is present, although the mechanisms of such regulation are yet to be understood.
Collapse
|
13
|
Teodor AH, Ooi EJ, Medina J, Alarcon M, Vaughn MD, Bruce BD, Bergkamp JJ. Aqueous-soluble bipyridine cobalt(ii/iii) complexes act as direct redox mediators in photosystem I-based biophotovoltaic devices. RSC Adv 2021; 11:10434-10450. [PMID: 35423559 PMCID: PMC8695705 DOI: 10.1039/d0ra10221k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 02/28/2021] [Indexed: 01/13/2023] Open
Abstract
Sustainable energy production is critical for meeting growing worldwide energy demands. Due to its stability and reduction potential, photosystem I (PSI) is attractive as the photosensitizer in biophotovoltaic devices. Herein, we characterize aqueous and organic solvent soluble synthetic bipyridine-based cobalt complexes as redox mediators for PSI-based biophotovoltaics applications. Cobalt-based complexes are not destructive to protein and have appropriate midpoint potentials for electron donation to PSI. We report on PSI stability in organic solvents commonly used in biophotovoltaics. We also show the effects of a mixed organic solvent phase on PSI reduction kinetics, slowing reduction rates approximately 8–38 fold as compared to fully aqueous systems, with implications for dye regeneration rates in PSI-based biophotovoltaics. Further, we show evidence of direct electron transfer from cobalt complexes to PSI. Finally, we report on photocurrent generation from Co mediator-PSI biophotovoltaic devices. Taken together, we discuss the development of novel Co complexes and our ability to fine-tune their characteristics via functional groups and counteranion choice to drive interaction with a biological electron acceptor on multiple levels from redox midpoints, spectral overlap, and solvent requirements, among others. This work suggests that fine-tuning of redox active species for interaction with a biological partner is possible for the creation and improvement of low cost, carbon-neutral energy production in the future. Sustainable energy production is critical for meeting growing worldwide energy demands.![]()
Collapse
Affiliation(s)
- Alexandra H Teodor
- Graduate School of Genome Science and Technology, University of Tennessee at Knoxville and Oak Ridge National Laboratory USA
| | - Eu-Jee Ooi
- Department of Chemistry and Biochemistry, California State University Bakersfield USA
| | - Jackeline Medina
- Department of Chemistry and Biochemistry, California State University Bakersfield USA
| | - Miguel Alarcon
- Department of Chemistry and Biochemistry, California State University Bakersfield USA
| | | | - Barry D Bruce
- Graduate School of Genome Science and Technology, University of Tennessee at Knoxville and Oak Ridge National Laboratory USA .,Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee at Knoxville USA.,Department of Chemical and Biomolecular Engineering, University of Tennessee at Knoxville USA
| | - Jesse J Bergkamp
- Department of Chemistry and Biochemistry, California State University Bakersfield USA
| |
Collapse
|
14
|
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.
Collapse
|
15
|
Khorobrykh S, Havurinne V, Mattila H, Tyystjärvi E. Oxygen and ROS in Photosynthesis. PLANTS (BASEL, SWITZERLAND) 2020; 9:E91. [PMID: 31936893 PMCID: PMC7020446 DOI: 10.3390/plants9010091] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 12/29/2019] [Accepted: 01/02/2020] [Indexed: 12/14/2022]
Abstract
Oxygen is a natural acceptor of electrons in the respiratory pathway of aerobic organisms and in many other biochemical reactions. Aerobic metabolism is always associated with the formation of reactive oxygen species (ROS). ROS may damage biomolecules but are also involved in regulatory functions of photosynthetic organisms. This review presents the main properties of ROS, the formation of ROS in the photosynthetic electron transport chain and in the stroma of chloroplasts, and ROS scavenging systems of thylakoid membrane and stroma. Effects of ROS on the photosynthetic apparatus and their roles in redox signaling are discussed.
Collapse
Affiliation(s)
| | | | | | - Esa Tyystjärvi
- Department of Biochemistry/Molecular Plant Biology, University of Turku, FI-20014 Turku, Finland or (S.K.); (V.H.); (H.M.)
| |
Collapse
|
16
|
In situ spectroelectrochemical investigation of a biophotoelectrode based on photoreaction centers embedded in a redox hydrogel. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135190] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
17
|
Garoz‐Ruiz J, Perales‐Rondon JV, Heras A, Colina A. Spectroelectrochemical Sensing: Current Trends and Challenges. ELECTROANAL 2019. [DOI: 10.1002/elan.201900075] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jesus Garoz‐Ruiz
- Department of ChemistryUniversidad de Burgos Pza. Misael Bañuelos s/n E-09001 Burgos Spain
| | | | - Aranzazu Heras
- Department of ChemistryUniversidad de Burgos Pza. Misael Bañuelos s/n E-09001 Burgos Spain
| | - Alvaro Colina
- Department of ChemistryUniversidad de Burgos Pza. Misael Bañuelos s/n E-09001 Burgos Spain
| |
Collapse
|
18
|
Petrova AA, Trubitsin BV, Boskhomdzhieva BK, Semenov AY, Tikhonov AN. Cyclic electron transfer around Photosystem I mediated by 2,3-dichloro-1,4-naphtoquinone and ascorbate. FEBS Lett 2018; 592:2220-2226. [PMID: 29885280 DOI: 10.1002/1873-3468.13154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/03/2018] [Accepted: 06/05/2018] [Indexed: 11/07/2022]
Abstract
In this work, we investigated electron transport around the photosynthetic pigment-protein complex of Photosystem I (PS I) mediated by external high-potential electron carrier 2,3-dichloro-1,4-naphtoquinone (Cl2 NQ) and ascorbate. It has been demonstrated that the oxidized species of Cl2 NQ and ascorbate serve as intermediates capable of accepting electrons from the iron-sulfur cluster FX of PS I. Reduced species of Cl2 NQ and ascorbate are oxidized by photooxidized PS I primary donor P700+ and/or by molecular oxygen. We have found the synergistic effect of Cl2 NQ and ascorbate on the rate of P700+ reduction. Accelerated electron flow to P700+, observed in the presence of both Cl2 NQ and ascorbate, is explained by an increase in the reduced species of Cl2 NQ due to electron transfer from ascorbate.
Collapse
Affiliation(s)
- Anastasia A Petrova
- A.N. Belozersky Institute of Physical-Chemical Biology, M.V. Lomonosov Moscow State University, Russia
| | | | - Baina K Boskhomdzhieva
- A.N. Belozersky Institute of Physical-Chemical Biology, M.V. Lomonosov Moscow State University, Russia
| | - Alexey Yu Semenov
- A.N. Belozersky Institute of Physical-Chemical Biology, M.V. Lomonosov Moscow State University, Russia.,N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Alexander N Tikhonov
- Faculty of Physics, M.V. Lomonosov Moscow State University, Russia.,N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia
| |
Collapse
|
19
|
Mutations in algal and cyanobacterial Photosystem I that independently affect the yield of initial charge separation in the two electron transfer cofactor branches. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:42-55. [DOI: 10.1016/j.bbabio.2017.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 10/16/2017] [Accepted: 10/17/2017] [Indexed: 01/02/2023]
|
20
|
Garoz-Ruiz J, Guillen-Posteguillo C, Heras A, Colina A. Simplifying the assessment of parameters of electron-transfer reactions by using easy-to-use thin-layer spectroelectrochemistry devices. Electrochem commun 2018. [DOI: 10.1016/j.elecom.2017.11.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
|
21
|
Mignée C, Mutoh R, Krieger-Liszkay A, Kurisu G, Sétif P. Gallium ferredoxin as a tool to study the effects of ferredoxin binding to photosystem I without ferredoxin reduction. PHOTOSYNTHESIS RESEARCH 2017; 134:251-263. [PMID: 28205062 DOI: 10.1007/s11120-016-0332-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 12/27/2016] [Indexed: 06/06/2023]
Abstract
Reduction of ferredoxin by photosystem I (PSI) involves the [4Fe-4S] clusters FA and FB harbored by PsaC, with FB being the direct electron transfer partner of ferredoxin (Fd). Binding of the redox-inactive gallium ferredoxin to PSI was investigated by flash-absorption spectroscopy, studying both the P700+ decay and the reduction of the native iron Fd in the presence of FdGa. FdGa binding resulted in a faster recombination between P700+ and (FA, FB)-, a slower electron escape from (FA, FB)- to exogenous acceptors, and a decreased amount of intracomplex FdFe reduction, in accordance with competitive binding between FdFe and FdGa. [FdGa] titrations of these effects revealed that the dissociation constant for the PSI:FdGa complex is different whether (FA, FB) is oxidized or singly reduced. This difference in binding, together with the increase in the recombination rate, could both be attributed to a c. -30 mV shift of the midpoint potential of (FA, FB), considered as a single electron acceptor, due to FdGa binding. This effect of FdGa binding, which can be extrapolated to FdFe because of the highly similar structure and the identical charge of the two Fds, should help irreversibility of electron transfer within the PSI:Fd complex. The effect of Fd binding on the individual midpoint potentials of FA and FB is also discussed with respect to the possible consequences on intra-PSI electron transfer and on the escape process.
Collapse
Affiliation(s)
- Clara Mignée
- Institut de Biologie Intégrative de la Cellule (I2BC), IBITECS, CEA, CNRS, Univ. Paris-Saclay, F-91198, Gif-sur-Yvette cedex, France
| | - Risa Mutoh
- Institute for Protein Research, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Anja Krieger-Liszkay
- Institut de Biologie Intégrative de la Cellule (I2BC), IBITECS, CEA, CNRS, Univ. Paris-Saclay, F-91198, Gif-sur-Yvette cedex, France
| | - Genji Kurisu
- Institute for Protein Research, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Pierre Sétif
- Institut de Biologie Intégrative de la Cellule (I2BC), IBITECS, CEA, CNRS, Univ. Paris-Saclay, F-91198, Gif-sur-Yvette cedex, France.
| |
Collapse
|
22
|
Inverted-region electron transfer as a mechanism for enhancing photosynthetic solar energy conversion efficiency. Proc Natl Acad Sci U S A 2017; 114:9267-9272. [PMID: 28814630 DOI: 10.1073/pnas.1704855114] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
In all photosynthetic organisms, light energy is used to drive electrons from a donor chlorophyll species via a series of acceptors across a biological membrane. These light-induced electron-transfer processes display a remarkably high quantum efficiency, indicating a near-complete inhibition of unproductive charge recombination reactions. It has been suggested that unproductive charge recombination could be inhibited if the reaction occurs in the so-called inverted region. However, inverted-region electron transfer has never been demonstrated in any native photosynthetic system. Here we demonstrate that the unproductive charge recombination in native photosystem I photosynthetic reaction centers does occur in the inverted region, at both room and cryogenic temperatures. Computational modeling of light-induced electron-transfer processes in photosystem I demonstrate a marked decrease in photosynthetic quantum efficiency, from 98% to below 72%, if the unproductive charge recombination process does not occur in the inverted region. Inverted-region electron transfer is therefore demonstrated to be an important mechanism contributing to efficient solar energy conversion in photosystem I. Inverted-region electron transfer does not appear to be an important mechanism in other photosystems; it is likely because of the highly reducing nature of photosystem I, and the energetic requirements placed on the pigments to operate in such a regime, that the inverted-region electron transfer mechanism becomes important.
Collapse
|
23
|
Nguyen K, Vaughn M, Frymier P, Bruce BD. In vitro kinetics of P 700+ reduction of Thermosynechococcus elongatus trimeric Photosystem I complexes by recombinant cytochrome c 6 using a Joliot-type LED spectrophotometer. PHOTOSYNTHESIS RESEARCH 2017; 131:79-91. [PMID: 27738959 DOI: 10.1007/s11120-016-0300-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 08/11/2016] [Indexed: 06/06/2023]
Abstract
The reduction rate of photo-oxidized Photosystem I (PSI) with various natural and artificial electron donors have been well studied by transient absorption spectroscopy. The electron transfer rate from various donors to P700+ has been measured for a wide range of photosynthetic organisms encompassing cyanobacteria, algae, and plants. PSI can be a limiting component due to tedious extraction and purification methods required for this membrane protein. In this report, we have determined the in vivo, intracellular cytochrome c 6 (cyt c 6)/PSI ratio in Thermosynechococcus elongatus (T.e.) using quantitative Western blot analysis. This information permitted the determination of P700+ reduction kinetics via recombinant cyt c 6 in a physiologically relevant ratio (cyt c 6: PSI) with a Joliot-type, LED-driven, pump-probe spectrophotometer. Dilute PSI samples were tested under varying cyt c 6 concentration, temperature, pH, and ionic strength, each of which shows similar trends to the reported literature utilizing much higher PSI concentrations with laser-based spectrophotometer. Our results do however indicate kinetic differences between actinic light sources (laser vs. LED), and we have attempted to resolve these effects by varying our LED light intensity and duration. The standardized configuration of this spectrophotometer will also allow a more uniform kinetic analysis of samples in different laboratories. We can conclude that our findings from the LED-based system display an added total protein concentration effect due to multiple turnover events of P700+ reduction by cyt c 6 during the longer illumination regime.
Collapse
Affiliation(s)
- Khoa Nguyen
- Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, 37996, USA
| | - Michael Vaughn
- Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, 37996, USA
- Department of Chemistry, Arizona State University, Tempe, AZ, 85287, USA
| | - Paul Frymier
- Department of Biomolecular and Chemical Engineering, University of Tennessee, Knoxville, TN, 37996, USA
- Sustainable Energy and Education Research Center, University of Tennessee, Knoxville, TN, 37996, USA
- Bredesen Center for Interdisciplinary Education and Research, University of Tennessee, Knoxville, TN, 37996, USA
| | - Barry D Bruce
- Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee, Knoxville, TN, 37996, USA.
- Department of Biomolecular and Chemical Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
- Sustainable Energy and Education Research Center, University of Tennessee, Knoxville, TN, 37996, USA.
- Bredesen Center for Interdisciplinary Education and Research, University of Tennessee, Knoxville, TN, 37996, USA.
| |
Collapse
|
24
|
|
25
|
Makita H, Hastings G. Modeling electron transfer in photosystem I. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2016; 1857:723-33. [DOI: 10.1016/j.bbabio.2016.03.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/13/2016] [Accepted: 03/15/2016] [Indexed: 11/26/2022]
|
26
|
Stieger KR, Ciornii D, Kölsch A, Hejazi M, Lokstein H, Feifel SC, Zouni A, Lisdat F. Engineering of supramolecular photoactive protein architectures: the defined co-assembly of photosystem I and cytochrome c using a nanoscaled DNA-matrix. NANOSCALE 2016; 8:10695-705. [PMID: 27150202 DOI: 10.1039/c6nr00097e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The engineering of renewable and sustainable protein-based light-to-energy converting systems is an emerging field of research. Here, we report on the development of supramolecular light-harvesting electrodes, consisting of the redox protein cytochrome c working as a molecular scaffold as well as a conductive wiring network and photosystem I as a photo-functional matrix element. Both proteins form complexes in solution, which in turn can be adsorbed on thiol-modified gold electrodes through a self-assembly mechanism. To overcome the limited stability of self-grown assemblies, DNA, a natural polyelectrolyte, is used as a further building block for the construction of a photo-active 3D architecture. DNA acts as a structural matrix element holding larger protein amounts and thus remarkably improving the maximum photocurrent and electrode stability. On investigating the photophysical properties, this system demonstrates that effective electron pathways have been created.
Collapse
Affiliation(s)
- Kai R Stieger
- Technical University of Applied Sciences Wildau, Institute of Applied Life Sciences, Biosystems Technology, Hochschulring 1, 15745 Wildau, Germany.
| | - Dmitri Ciornii
- Technical University of Applied Sciences Wildau, Institute of Applied Life Sciences, Biosystems Technology, Hochschulring 1, 15745 Wildau, Germany.
| | - Adrian Kölsch
- Humboldt-University of Berlin, Institute of Biology, Biochemistry and Structural Biology, Unter den Linden 6, 10099 Berlin, Germany
| | - Mahdi Hejazi
- Humboldt-University of Berlin, Institute of Biology, Biochemistry and Structural Biology, Unter den Linden 6, 10099 Berlin, Germany
| | - Heiko Lokstein
- University of Glasgow, Glasgow Biomedical Research Centre, Institute for Molecular, Cell & Systems Biology, 120 University Place, Glasgow, G12 8TA, Scotland, UK
| | - Sven C Feifel
- Technical University of Applied Sciences Wildau, Institute of Applied Life Sciences, Biosystems Technology, Hochschulring 1, 15745 Wildau, Germany.
| | - Athina Zouni
- Humboldt-University of Berlin, Institute of Biology, Biochemistry and Structural Biology, Unter den Linden 6, 10099 Berlin, Germany
| | - Fred Lisdat
- Technical University of Applied Sciences Wildau, Institute of Applied Life Sciences, Biosystems Technology, Hochschulring 1, 15745 Wildau, Germany.
| |
Collapse
|
27
|
Castañeda Ocampo OE, Gordiichuk P, Catarci S, Gautier DA, Herrmann A, Chiechi RC. Mechanism of Orientation-Dependent Asymmetric Charge Transport in Tunneling Junctions Comprising Photosystem I. J Am Chem Soc 2015; 137:8419-27. [PMID: 26057523 PMCID: PMC4558993 DOI: 10.1021/jacs.5b01241] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recently, photoactive proteins have gained a lot of attention due to their incorporation into bioinspired (photo)electrochemical and solar cells. This paper describes the measurement of the asymmetry of current transport of self-assembled monolayers (SAMs) of the entire photosystem I (PSI) protein complex (not the isolated reaction center, RCI), on two different "director SAMs" supported by ultraflat Au substrates. The director SAMs induce the preferential orientation of PSI, which manifest as asymmetry in tunneling charge-transport. We measured the oriented SAMs of PSI using eutectic Ga-In (EGaIn), a large-area technique, and conducting probe atomic force microscopy (CP-AFM), a single-complex technique, and determined that the transport properties are comparable. By varying the temperatures at which the measurements were performed, we found that there is no measurable dependence of the current on temperature from ±0.1 to ±1.0 V bias, and thus, we suggest tunneling as the mechanism for transport; there are no thermally activated (e.g., hopping) processes. Therefore, it is likely that relaxation in the electron transport chain is not responsible for the asymmetry in the conductance of SAMs of PSI complexes in these junctions, which we ascribe instead to the presence of a large, net dipole moment present in PSI.
Collapse
Affiliation(s)
- Olga E Castañeda Ocampo
- †Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.,‡Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Pavlo Gordiichuk
- ‡Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Stefano Catarci
- ‡Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Daniel A Gautier
- ‡Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Andreas Herrmann
- ‡Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Ryan C Chiechi
- †Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.,‡Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| |
Collapse
|
28
|
Kosugi M, Shizuma R, Moriyama Y, Koike H, Fukunaga Y, Takeuchi A, Uesugi K, Suzuki Y, Imura S, Kudoh S, Miyazawa A, Kashino Y, Satoh K. Ideal osmotic spaces for chlorobionts or cyanobionts are differentially realized by lichenized fungi. PLANT PHYSIOLOGY 2014; 166:337-48. [PMID: 25056923 PMCID: PMC4149719 DOI: 10.1104/pp.113.232942] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Lichens result from symbioses between a fungus and either a green alga or a cyanobacterium. They are known to exhibit extreme desiccation tolerance. We investigated the mechanism that makes photobionts biologically active under severe desiccation using green algal lichens (chlorolichens), cyanobacterial lichens (cyanolichens), a cephalodia-possessing lichen composed of green algal and cyanobacterial parts within the same thallus, a green algal photobiont, an aerial green alga, and a terrestrial cyanobacterium. The photosynthetic response to dehydration by the cyanolichen was almost the same as that of the terrestrial cyanobacterium but was more sensitive than that of the chlorolichen or the chlorobiont. Different responses to dehydration were closely related to cellular osmolarity; osmolarity was comparable between the cyanolichen and a cyanobacterium as well as between a chlorolichen and a green alga. In the cephalodium-possessing lichen, osmolarity and the effect of dehydration on cephalodia were similar to those exhibited by cyanolichens. The green algal part response was similar to those exhibited by chlorolichens. Through the analysis of cellular osmolarity, it was clearly shown that photobionts retain their original properties as free-living organisms even after lichenization.
Collapse
Affiliation(s)
- Makiko Kosugi
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Ryoko Shizuma
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Yufu Moriyama
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Hiroyuki Koike
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Yuko Fukunaga
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Akihisa Takeuchi
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Kentaro Uesugi
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Yoshio Suzuki
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Satoshi Imura
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Sakae Kudoh
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Atsuo Miyazawa
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Yasuhiro Kashino
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| | - Kazuhiko Satoh
- Graduate School of Life Science, University of Hyogo, Kamigohri, Ako-gun, Hyogo 678-1297, Japan (M.K., R.S., Y.M., H.K., Y.F., A.M., Y.K., K.S.);Research and Utilization Division, Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan (A.T., K.U., Y.S.);National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.); andDepartment of Polar Science, Graduate University for Advanced Studies, Tachikawa, Tokyo 190-8518, Japan (S.I., S.K.)
| |
Collapse
|
29
|
Tikhonov AN. The cytochrome b6f complex at the crossroad of photosynthetic electron transport pathways. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 81:163-83. [PMID: 24485217 DOI: 10.1016/j.plaphy.2013.12.011] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 12/11/2013] [Indexed: 05/03/2023]
Abstract
Regulation of photosynthetic electron transport at the level of the cytochrome b6f complex provides efficient performance of the chloroplast electron transport chain (ETC). In this review, after brief overview of the structural organization of the chloroplast ETC, the consideration of the problem of electron transport control is focused on the plastoquinone (PQ) turnover and its interaction with the b6f complex. The data available show that the rates of plastoquinol (PQH2) formation in PSII and its diffusion to the b6f complex do not limit the overall rate of electron transfer between photosystem II (PSII) and photosystem I (PSI). Analysis of experimental and theoretical data demonstrates that the rate-limiting step in the intersystem chain of electron transport is determined by PQH2 oxidation at the Qo-site of the b6f complex, which is accompanied by the proton release into the thylakoid lumen. The acidification of the lumen causes deceleration of PQH2 oxidation, thus impeding the intersystem electron transport. Two other mechanisms of regulation of the intersystem electron transport have been considered: (i) "state transitions" associated with the light-induced redistribution of solar energy between PSI and PSII, and (ii) redistribution of electron fluxes between alternative pathways (noncyclic electron transport and cyclic electron flow around PSI).
Collapse
|
30
|
Gordiichuk PI, Wetzelaer GJAH, Rimmerman D, Gruszka A, de Vries JW, Saller M, Gautier DA, Catarci S, Pesce D, Richter S, Blom PWM, Herrmann A. Solid-state biophotovoltaic cells containing photosystem I. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:4863-9. [PMID: 24862686 DOI: 10.1002/adma.201401135] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 04/17/2014] [Indexed: 05/20/2023]
Abstract
The large multiprotein complex, photosystem I (PSI), which is at the heart of light-dependent reactions in photosynthesis, is integrated as the active component in a solid-state organic photovoltaic cell. These experiments demonstrate that photoactive megadalton protein complexes are compatible with solution processing of organic-semiconductor materials and operate in a dry non-natural environment that is very different from the biological membrane.
Collapse
Affiliation(s)
- Pavlo I Gordiichuk
- Polymer Chemistry and Bioengineering Group, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Kashey TS, Cowgill JB, McConnell MD, Flores M, Redding KE. Expression and characterization of cytochrome c553 from Heliobacterium modesticaldum. PHOTOSYNTHESIS RESEARCH 2014; 120:291-299. [PMID: 24557489 DOI: 10.1007/s11120-014-9982-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Accepted: 02/05/2014] [Indexed: 06/03/2023]
Abstract
Cytochrome c553 of Heliobacterium modesticaldum is the donor to P800 (+), the primary electron donor of the heliobacterial reaction center (HbRC). It is a membrane-anchored 14-kDa cytochrome that accomplishes electron transfer from the cytochrome bc complex to the HbRC. The petJ gene encoding cyt c 553 was cloned and expressed in Escherichia coli with a hexahistidine tag replacing the lipid attachment site to create a soluble donor that could be made in a preparative scale. The recombinant cytochrome had spectral characteristics typical of a c-type cytochrome, including an asymmetric α-band, and a slightly red-shifted Soret band when reduced. The EPR spectrum of the oxidized protein was characteristic of a low-spin cytochrome. The midpoint potential of the recombinant cytochrome was +217 ± 10 mV. The interaction between soluble recombinant cytochrome c 553 and the HbRC was also studied. Re-reduction of photooxidized P800 (+) was accelerated by addition of reduced cytochrome c 553. The kinetics were characteristic of a bimolecular reaction with a second order rate of 1.53 × 10(4) M(-1) s(-1) at room temperature. The rate manifested a steep temperature dependence, with a calculated activation energy of 91 kJ mol(-1), similar to that of the native protein in Heliobacillus gestii cells. These data demonstrate that the recombinant soluble cytochrome is comparable to the native protein, and likely lacks a discrete electrostatic binding site on the HbRC.
Collapse
Affiliation(s)
- Trevor S Kashey
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287-1604, USA
| | | | | | | | | |
Collapse
|
32
|
Aussel L, Pierrel F, Loiseau L, Lombard M, Fontecave M, Barras F. Biosynthesis and physiology of coenzyme Q in bacteria. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1837:1004-11. [PMID: 24480387 DOI: 10.1016/j.bbabio.2014.01.015] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 01/23/2014] [Accepted: 01/24/2014] [Indexed: 11/24/2022]
Abstract
Ubiquinone, also called coenzyme Q, is a lipid subject to oxido-reduction cycles. It functions in the respiratory electron transport chain and plays a pivotal role in energy generating processes. In this review, we focus on the biosynthetic pathway and physiological role of ubiquinone in bacteria. We present the studies which, within a period of five decades, led to the identification and characterization of the genes named ubi and involved in ubiquinone production in Escherichia coli. When available, the structures of the corresponding enzymes are shown and their biological function is detailed. The phenotypes observed in mutants deficient in ubiquinone biosynthesis are presented, either in model bacteria or in pathogens. A particular attention is given to the role of ubiquinone in respiration, modulation of two-component activity and bacterial virulence. This article is part of a Special Issue entitled: 18th European Bioenergetic Conference.
Collapse
Affiliation(s)
- Laurent Aussel
- Laboratoire de Chimie Bactérienne, UMR 7283 Aix-Marseille Université - CNRS, Institut de Microbiologie de la Méditerranée, 31 Chemin Joseph Aiguier 13009 Marseille, France
| | - Fabien Pierrel
- Laboratoire de Chimie et Biologie des Métaux, UMR 5249 CEA - Université Grenoble I - CNRS, 17 Rue des Martyrs, 38054 Grenoble Cedex France
| | - Laurent Loiseau
- Laboratoire de Chimie Bactérienne, UMR 7283 Aix-Marseille Université - CNRS, Institut de Microbiologie de la Méditerranée, 31 Chemin Joseph Aiguier 13009 Marseille, France
| | - Murielle Lombard
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, UPMC, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05 France
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques, UMR 8229 CNRS, UPMC, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05 France
| | - Frédéric Barras
- Laboratoire de Chimie Bactérienne, UMR 7283 Aix-Marseille Université - CNRS, Institut de Microbiologie de la Méditerranée, 31 Chemin Joseph Aiguier 13009 Marseille, France.
| |
Collapse
|
33
|
Nguyen K, Bruce BD. Growing green electricity: progress and strategies for use of photosystem I for sustainable photovoltaic energy conversion. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1837:1553-66. [PMID: 24388916 DOI: 10.1016/j.bbabio.2013.12.013] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 12/17/2013] [Accepted: 12/25/2013] [Indexed: 10/25/2022]
Abstract
Oxygenic photosynthesis is driven via sequential action of Photosystem II (PSII) and (PSI)reaction centers via the Z-scheme. Both of these pigment-membrane protein complexes are found in cyanobacteria, algae, and plants. Unlike PSII, PSI is remarkably stable and does not undergo limiting photo-damage. This stability, as well as other fundamental structural differences, makes PSI the most attractive reaction centers for applied photosynthetic applications. These applied applications exploit the efficient light harvesting and high quantum yield of PSI where the isolated PSI particles are redeployed providing electrons directly as a photocurrent or, via a coupled catalyst to yield H₂. Recent advances in molecular genetics, synthetic biology, and nanotechnology have merged to allow PSI to be integrated into a myriad of biohybrid devices. In photocurrent producing devices, PSI has been immobilized onto various electrode substrates with a continuously evolving toolkit of strategies and novel reagents. However, these innovative yet highly variable designs make it difficult to identify the rate-limiting steps and/or components that function as bottlenecks in PSI-biohybrid devices. In this study we aim to highlight these recent advances with a focus on identifying the similarities and differences in electrode surfaces, immobilization/orientation strategies, and artificial redox mediators. Collectively this work has been able to maintain an annual increase in photocurrent density (Acm⁻²) of ~10-fold over the past decade. The potential drawbacks and attractive features of some of these schemes are also discussed with their feasibility on a large-scale. As an environmentally benign and renewable resource, PSI may provide a new sustainable source of bioenergy. This article is part of a special issue entitled: photosynthesis research for sustainability: keys to produce clean energy.
Collapse
Affiliation(s)
- Khoa Nguyen
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA
| | - Barry D Bruce
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA; Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA; Bredesen Center for Interdisciplinary Research and Education, University of Tennessee, Knoxville, TN 37996, USA.
| |
Collapse
|
34
|
Hartmann V, Kothe T, Pöller S, El-Mohsnawy E, Nowaczyk MM, Plumeré N, Schuhmann W, Rögner M. Redox hydrogels with adjusted redox potential for improved efficiency in Z-scheme inspired biophotovoltaic cells. Phys Chem Chem Phys 2014; 16:11936-41. [DOI: 10.1039/c4cp00380b] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
35
|
Sharma P, Stagge S, Bekker M, Bettenbrock K, Hellingwerf KJ. Kinase activity of ArcB from Escherichia coli is subject to regulation by both ubiquinone and demethylmenaquinone. PLoS One 2013; 8:e75412. [PMID: 24116043 PMCID: PMC3792059 DOI: 10.1371/journal.pone.0075412] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 08/14/2013] [Indexed: 01/15/2023] Open
Abstract
Expression of the catabolic network in Escherichia coli is predominantly regulated, via oxygen availability, by the two-component system ArcBA. It has been shown that the kinase activity of ArcB is controlled by the redox state of two critical pairs of cysteines in dimers of the ArcB sensory kinase. Among the cellular components that control the redox state of these cysteines of ArcB are the quinones from the cytoplasmic membrane of the cell, which function in ‘respiratory’ electron transfer. This study is an effort to understand how the redox state of the quinone pool(s) is sensed by the cell via the ArcB kinase. We report the relationship between growth, quinone content, ubiquinone redox state, the level of ArcA phosphorylation, and the level of ArcA-dependent gene expression, in a number of mutants of E. coli with specific alterations in their set of quinones, under a range of physiological conditions. Our results provide experimental evidence for a previously formulated hypothesis that not only ubiquinone, but also demethylmenaquinone, can inactivate kinase activity of ArcB. Also, in a mutant strain that only contains demethylmenaquinone, the extent of ArcA phosphorylation can be modulated by the oxygen supply rate, which shows that demethylmenaquinone can also inactivate ArcB in its oxidized form. Furthermore, in batch cultures of a strain that contains ubiquinone as its only quinone species, we observed that the ArcA phosphorylation level closely followed the redox state of the ubiquinone/ubiquinol pool, much more strictly than it does in the wild type strain. Therefore, at low rates of oxygen supply in the wild type strain, the activity of ArcB may be inhibited by demethylmenaquinone, in spite of the fact that the ubiquinones are present in the ubiquinol form.
Collapse
Affiliation(s)
- Poonam Sharma
- Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, University of Amsterdam, and Netherlands Institute for Systems Biology, Amsterdam, the Netherlands
| | - Stefan Stagge
- MPI für Dynamik Komplexer Technischer Systeme, Experimentelle Systembiologie, Magdeburg, Germany
| | - Martijn Bekker
- Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, University of Amsterdam, and Netherlands Institute for Systems Biology, Amsterdam, the Netherlands
| | - Katja Bettenbrock
- MPI für Dynamik Komplexer Technischer Systeme, Experimentelle Systembiologie, Magdeburg, Germany
| | - Klaas J. Hellingwerf
- Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, University of Amsterdam, and Netherlands Institute for Systems Biology, Amsterdam, the Netherlands
- * E-mail:
| |
Collapse
|
36
|
Sharma P, Teixeira de Mattos MJ, Hellingwerf KJ, Bekker M. On the function of the various quinone species in Escherichia coli. FEBS J 2012; 279:3364-73. [PMID: 22521170 DOI: 10.1111/j.1742-4658.2012.08608.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The respiratory chain of Escherichia coli contains three quinones. Menaquinone and demethylmenaquinone have low midpoint potentials and are involved in anaerobic respiration, while ubiquinone, which has a high midpoint potential, is involved in aerobic and nitrate respiration. Here, we report that demethylmenaquinone plays a role not only in trimethylaminooxide-, dimethylsulfoxide- and fumarate-dependent respiration, but also in aerobic respiration. Furthermore, we demonstrate that demethylmenaquinone serves as an electron acceptor for oxidation of succinate to fumarate, and that all three quinol oxidases of E. coli accept electrons from this naphtoquinone derivative.
Collapse
Affiliation(s)
- Poonam Sharma
- Molecular Microbial Physiology group, Swammerdam Institute for Life Sciences, University of Amsterdam, The Netherlands
| | | | | | | |
Collapse
|
37
|
Saito K, Ishikita H. Cationic state distribution over the P700 chlorophyll pair in photosystem I. Biophys J 2012; 101:2018-25. [PMID: 22004756 DOI: 10.1016/j.bpj.2011.09.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 09/01/2011] [Accepted: 09/08/2011] [Indexed: 10/16/2022] Open
Abstract
The primary electron donor P700 in photosystem I is composed of two chlorophylls, P(A) and P(B). P700 forms the cationic [P(A)/P(B)](•+) state as a result of light-induced electron transfer. We obtained a P(A)(•+)/P(B)(•+) ratio of 28:72 and a spin distribution of 22:78 for the entire PSI protein-pigment complex. By considering the influence of the protein components on the redox potential for one-electron oxidation of P(A)/P(B) monomers, we found that the following three factors significantly contributed to a large P(B)(•+) population relative to P(A)(•+): 1), Thr-A743 forming a H-bond with P(A); 2), P(A) as a chlorophyll a epimer; and 3), a conserved PsaA/PsaB pair, the Arg-A750/Ser-B734 residue. In addition, 4), the methyl-ester groups of the accessory chlorophylls A(-1A)/A(-1B) significantly stabilized the cationic [P(A)/P(B)](•+) state and 5), the methyl-ester group orientations were completely different in A(-1A) and A(-1B) as seen in the crystal structure. When the methyl-ester group was rotated, the spin-density distribution over P(A)/P(B) ranged from 22:78 to 15:85.
Collapse
Affiliation(s)
- Keisuke Saito
- Career-Path Promotion Unit for Young Life Scientists, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | | |
Collapse
|
38
|
KATO Y, TSUJII M, WATANABE T. Photoelectrochemical Behavior of Photosystem I Complex in the Presence of a Viologen as Mediator at SnO2 Electrode. ELECTROCHEMISTRY 2011. [DOI: 10.5796/electrochemistry.79.845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|