1
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Fereiro JA, Bendikov T, Herrmann A, Pecht I, Sheves M, Cahen D. Protein Orientation Defines Rectification of Electronic Current via Solid-State Junction of Entire Photosystem-1 Complex. J Phys Chem Lett 2023; 14:2973-2982. [PMID: 36940422 DOI: 10.1021/acs.jpclett.2c03700] [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: 06/18/2023]
Abstract
We demonstrate that the direction of current rectification via one of nature's most efficient light-harvesting systems, the photosystem 1 complex (PS1), can be controlled by its orientation on Au substrates. Molecular self-assembly of the PS1 complex using four different linkers with distinct functional head groups that interact by electrostatic and hydrogen bonds with different surface parts of the entire protein PS1 complex was used to tailor the PS1 orientation. We observe an orientation-dependent rectification in the current-voltage characteristics for linker/PS1 molecule junctions. Results of an earlier study using a surface two-site PS1 mutant complex having its orientation set by covalent binding to the Au substrate supports our conclusion. Current-voltage-temperature measurements on the linker/PS1 complex indicate off-resonant tunneling as the main electron transport mechanism. Our ultraviolet photoemission spectroscopy results highlight the importance of the protein orientation for the energy level alignment and provide insight into the charge transport mechanism via the PS1 transport chain.
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Affiliation(s)
- Jerry A Fereiro
- Department of Molecular Chemistry & Materials Science, Weizmann Inst. of Science, Rehovot 7610001, Israel
- School of Chemistry, Indian Inst. of Science Education & Research, Thiruvananthapuram 695551, Kerala, India
| | - Tatyana Bendikov
- Department of Chemical Research Support, Weizmann Inst. of Science, Rehovot 7610001, Israel
| | - Andreas Herrmann
- DWI - Leibniz-Institute for Interactive Materials, 52074 Aachen, Germany
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Israel Pecht
- Department of Immunology & Regenerative Biology, Weizmann Inst. of Science, Rehovot 7610001, Israel
| | - Mordechai Sheves
- Department of Molecular Chemistry & Materials Science, Weizmann Inst. of Science, Rehovot 7610001, Israel
| | - David Cahen
- Department of Molecular Chemistry & Materials Science, Weizmann Inst. of Science, Rehovot 7610001, Israel
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2
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Smolinski SL, Lubner CE, Guo Z, Artz JH, Brown KA, Mulder DW, King PW. The influence of electron utilization pathways on photosystem I photochemistry in Synechocystis sp. PCC 6803. RSC Adv 2022; 12:14655-14664. [PMID: 35702219 PMCID: PMC9109680 DOI: 10.1039/d2ra01295b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 05/06/2022] [Indexed: 01/24/2023] Open
Abstract
The capacity of cyanobacteria to adapt to highly dynamic photon flux and nutrient availability conditions results from controlled management and use of reducing power, and is a major contributing factor to the efficiency of photosynthesis in aquatic environments. The response to changing conditions includes modulating gene expression and protein-protein interactions that serve to adjust the use of electron flux and mechanisms that control photosynthetic electron transport (PET). In this regard, the photochemical activity of photosystem I (PSI) reaction centers can support balancing of cyclic (CEF) and linear electron flow (LEF), and the coupling of redox carriers for use by electron utilization pathways. Therefore, changes in the utilization of reducing power might be expected to result in compensating changes at PSI as a means to support balance of electron flux. To understand this functional relationship, we investigated the properties of PSI and its photochemical activity in cells that lack flavodiiron 1 catalyzed oxygen reduction activity (ORR1). In the absence of ORR1, the oxygen evolution and consumption rates declined together with a shift in the oligomeric form of PSI towards monomers. The effect of these changes on PSI energy and electron transfer properties was examined in isolated trimer and monomer fractions of PSI reaction centers. Collectively, the results demonstrate that PSI photochemistry is modulated through coordination with the depletion of electron demand in the absence of ORR1.
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Affiliation(s)
- Sharon L. Smolinski
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Carolyn E. Lubner
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Zhanjun Guo
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Jacob H. Artz
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Katherine A. Brown
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - David W. Mulder
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
| | - Paul W. King
- National Renewable Energy Laboratory15013 Denver West ParkwayGoldenCO80401USA
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3
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Bolychevtseva YV, Tropin IV, Stadnichuk IN. State 1 and State 2 in Photosynthetic Apparatus of Red Microalgae and Cyanobacteria. BIOCHEMISTRY. BIOKHIMIIA 2021; 86:1181-1191. [PMID: 34903149 DOI: 10.1134/s0006297921100023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/23/2021] [Accepted: 06/23/2021] [Indexed: 06/14/2023]
Abstract
Imbalanced light absorption by photosystem I (PSI) and photosystem II (PSII) in oxygenic phototrophs leads to changes in interaction of photosystems altering the linear electron flow. In plants and green algae, this imbalance is mitigated by a partial migration of the chlorophyll a/b containing light-harvesting antenna between the two photosystem core complexes. This migration is registered as fluorescence changes of the pigment apparatus and is termed the reverse transitions between States 1 and 2. By contrast, the molecular mechanism of State 1/2 transitions in phycobilisome (PBS)-containing photosynthetics, cyanobacteria and red algae, is still insufficiently understood. The suggested hypotheses - PBS movement along the surface of thylakoid membrane between PSI and PSII complexes, reversible PBS detachment from the dimeric PSII complex, and spillover - have some limitations as they do not fully explain the accumulated data. Here, we have recorded changes in the stationary fluorescence emission spectra of red algae and cyanobacteria in States 1/2 at room temperature, which allowed us to offer an explanation of the existing contradictions. The change of room temperature fluorescence of chlorophyll belonged to PSII was revealed, while the fluorescence of PBS associated with the PSII complexes remained during States 1/2 transitions at the stable level. Only the reversible dissociation of PBS from the monomeric PSI was revealed earlier which implied different degree of surface contact of PBS with the two photosystems. The detachment of PBS from the PSI corresponds to ferredoxin oxidation as electron carrier and the increase of cyclic electron transport in the pigment apparatus in State I.
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Affiliation(s)
- Yulia V Bolychevtseva
- Bach Institute of Biochemistry, Research Center of Biotechnology, Russian Academy of Sciences, Moscow, 119071, Russia.
| | - Ivan V Tropin
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - Igor N Stadnichuk
- Timiryasev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, 127726, Russia.
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4
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Çoruh O, Frank A, Tanaka H, Kawamoto A, El-Mohsnawy E, Kato T, Namba K, Gerle C, Nowaczyk MM, Kurisu G. Cryo-EM structure of a functional monomeric Photosystem I from Thermosynechococcus elongatus reveals red chlorophyll cluster. Commun Biol 2021; 4:304. [PMID: 33686186 PMCID: PMC7940658 DOI: 10.1038/s42003-021-01808-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 02/05/2021] [Indexed: 01/31/2023] Open
Abstract
A high-resolution structure of trimeric cyanobacterial Photosystem I (PSI) from Thermosynechococcus elongatus was reported as the first atomic model of PSI almost 20 years ago. However, the monomeric PSI structure has not yet been reported despite long-standing interest in its structure and extensive spectroscopic characterization of the loss of red chlorophylls upon monomerization. Here, we describe the structure of monomeric PSI from Thermosynechococcus elongatus BP-1. Comparison with the trimer structure gave detailed insights into monomerization-induced changes in both the central trimerization domain and the peripheral regions of the complex. Monomerization-induced loss of red chlorophylls is assigned to a cluster of chlorophylls adjacent to PsaX. Based on our findings, we propose a role of PsaX in the stabilization of red chlorophylls and that lipids of the surrounding membrane present a major source of thermal energy for uphill excitation energy transfer from red chlorophylls to P700.
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Affiliation(s)
- Orkun Çoruh
- Laboratory for Protein Crystallography, Institute for Protein Research, Osaka University, Suita, Osaka, Japan
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan
| | - Anna Frank
- Plant Biochemistry, Faculty of Biology and Biotechnology, Ruhr-University Bochum, Bochum, Germany
| | - Hideaki Tanaka
- Laboratory for Protein Crystallography, Institute for Protein Research, Osaka University, Suita, Osaka, Japan
| | - Akihiro Kawamoto
- Laboratory for Protein Crystallography, Institute for Protein Research, Osaka University, Suita, Osaka, Japan
| | - Eithar El-Mohsnawy
- Department of Botany and Microbiology, Faculty of Science, Kafrelsheikh University, Kafr Al Sheikh, Egypt
| | - Takayuki Kato
- Laboratory of CryoEM Structural Biology, Institute for Protein Research, Osaka University, Suita, Osaka, Japan
| | - Keiichi Namba
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan
- RIKEN Center for Biosystems Dynamics Research and SPring-8 Center, Suita, Osaka, Japan
- JEOL YOKOGUSHI Research Alliance Laboratories, Osaka University, Suita, Osaka, Japan
| | - Christoph Gerle
- Laboratory for Protein Crystallography, Institute for Protein Research, Osaka University, Suita, Osaka, Japan.
| | - Marc M Nowaczyk
- Plant Biochemistry, Faculty of Biology and Biotechnology, Ruhr-University Bochum, Bochum, Germany.
| | - Genji Kurisu
- Laboratory for Protein Crystallography, Institute for Protein Research, Osaka University, Suita, Osaka, Japan.
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan.
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5
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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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6
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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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7
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Stadnichuk IN, Novikova TM, Miniuk GS, Boichenko VA, Bolychevtseva YV, Gusev ES, Lukashev EP. Phycoerythrin Association with Photosystem II in the Cryptophyte Alga Rhodomonas salina. BIOCHEMISTRY (MOSCOW) 2020; 85:679-688. [PMID: 32586231 DOI: 10.1134/s000629792006005x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
# Deceased. Cryptophyte algae belong to a special group of oxygenic photosynthetic organisms containing pigment combination unique for plastids - phycobiliproteins and chlorophyll a/c-containing antenna. Despite the progress in investigation of morphological and ecological features, as well as genome-based systematics of cryptophytes, their photosynthetic apparatus remains poorly understood. The ratio of the photosystems (PS)s I and II is unknown and information on participation of the two antennal complexes in functions of the two photosystems is inconsistent. In the present work we demonstrated for the first time that the cryptophyte alga Rhodomonas salina had the PSI to PSII ratio in thylakoid membranes equal to 1 : 4, whereas this ratio in cyanobacteria and higher plants was known to be 3 : 1 and 1 : 1, respectively. Furthermore, it was established that contrary to the case of cyanobacteria the phycobiliprotein antenna represented by phycoerythrin-545 (PE-545) in R. salina was associated only with the PSII, which indicated specific spatial organization of these protein pigments within the thylakoids that did not facilitate interaction with the PSI.
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Affiliation(s)
- I N Stadnichuk
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, 127726, Russia.
| | - T M Novikova
- Bach Institute of Biochemistry, Research Center of Biotechnology, Russian Academy of Sciences, Moscow, 119071, Russia
| | - G S Miniuk
- Bach Institute of Biochemistry, Research Center of Biotechnology, Russian Academy of Sciences, Moscow, 119071, Russia
| | - V A Boichenko
- Institute of Fundamental Problems of Biology of the Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Yu V Bolychevtseva
- Kovalevski Institute of Biology of the Southern Seas, Russian Academy of Sciences, Sevastopol, 299011, Russia
| | - E S Gusev
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, 127726, Russia
| | - E P Lukashev
- Lomonosov Moscow State University, Faculty of Biology, Moscow, 119991, Russia
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8
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Krasilnikov PM, Zlenko DV, Stadnichuk IN. Rates and pathways of energy migration from the phycobilisome to the photosystem II and to the orange carotenoid protein in cyanobacteria. FEBS Lett 2019; 594:1145-1154. [PMID: 31799708 DOI: 10.1002/1873-3468.13709] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 11/27/2019] [Accepted: 11/28/2019] [Indexed: 02/01/2023]
Abstract
The phycobilisome (PBS) is the cyanobacterial antenna complex which transfers absorbed light energy to the photosystem II (PSII), while the excess energy is nonphotochemically quenched by interaction of the PBS with the orange carotenoid protein (OCP). Here, the molecular model of the PBS-PSII-OCP supercomplex was utilized to assess the resonance energy transfer from PBS to PSII and, using the excitonic theory, the transfer from PBS to OCP. Our estimates show that the effective energy migration from PBS to PSII is realized due to the existence of several transfer pathways from phycobilin chromophores of the PBS to the neighboring antennal chlorophyll molecules of the PSII. At the same time, the single binding site of photoactivated OCP and the PBS is sufficient to realize the quenching.
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Affiliation(s)
| | - Dmitry V Zlenko
- Faculty of Biology, M.V. Lomonosov State University, Moscow, Russia
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9
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Zheng L, Li Y, Li X, Zhong Q, Li N, Zhang K, Zhang Y, Chu H, Ma C, Li G, Zhao J, Gao N. Structural and functional insights into the tetrameric photosystem I from heterocyst-forming cyanobacteria. NATURE PLANTS 2019; 5:1087-1097. [PMID: 31595062 DOI: 10.1038/s41477-019-0525-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Accepted: 09/05/2019] [Indexed: 05/05/2023]
Abstract
Two large protein-cofactor complexes, photosystem I and photosystem II, are the central components of photosynthesis in the thylakoid membranes. Here, we report the 2.37-Å structure of a tetrameric photosystem I complex from a heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Four photosystem I monomers, organized in a dimer of dimer, form two distinct interfaces that are largely mediated by specifically orientated polar lipids, such as sulfoquinovosyl diacylglycerol. The structure depicts a more closely connected network of chlorophylls across monomer interfaces than those seen in trimeric PSI from thermophilic cyanobacteria, possibly allowing a more efficient energy transfer between monomers. Our physiological data also revealed a functional link of photosystem I oligomerization to cyclic electron flow and thylakoid membrane organization.
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Affiliation(s)
- Lvqin Zheng
- State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, School of Life Sciences, Peking University, Beijing, China
| | - Yanbing Li
- State Key Laboratory of Protein and Plant Genetic Engineering, School of Life Sciences, Peking University, Beijing, China
| | - Xiying Li
- State Key Laboratory of Protein and Plant Genetic Engineering, School of Life Sciences, Peking University, Beijing, China
| | - Qinglu Zhong
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Ningning Li
- State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, School of Life Sciences, Peking University, Beijing, China
| | - Kun Zhang
- State Key Laboratory of Protein and Plant Genetic Engineering, School of Life Sciences, Peking University, Beijing, China
| | - Yuebin Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Huiying Chu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Chengying Ma
- State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, School of Life Sciences, Peking University, Beijing, China
| | - Guohui Li
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
| | - Jindong Zhao
- State Key Laboratory of Protein and Plant Genetic Engineering, School of Life Sciences, Peking University, Beijing, China.
- Chinese Academy of Sciences Key Laboratory of Phycological Research, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China.
| | - Ning Gao
- State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, School of Life Sciences, Peking University, Beijing, China.
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10
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Bolychevtseva YV, Terekhova IV, Shubin VV, Yurina NP. Thermostability of Photosystem I Trimers and Monomers from the Cyanobacterium Arthrospira platensis. APPL BIOCHEM MICRO+ 2019. [DOI: 10.1134/s0003683819030050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Zeaxanthin and echinenone modify the structure of photosystem I trimer in Synechocystis sp. PCC 6803. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:510-518. [DOI: 10.1016/j.bbabio.2017.05.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 04/27/2017] [Accepted: 05/01/2017] [Indexed: 01/26/2023]
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12
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Shubin VV, Terekhova IV, Bolychevtseva YV, El-Mohsnawy E, Rögner M, Mäntele W, Kopczak MJ, Džafić E. Thermostability of photosystem I trimers and monomers from the cyanobacterium Thermosynechococcus elongatus. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 179:17-22. [PMID: 28213141 DOI: 10.1016/j.saa.2017.02.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 01/30/2017] [Accepted: 02/04/2017] [Indexed: 06/06/2023]
Abstract
The performance of solar energy conversion into alternative energy sources in artificial systems highly depends on the thermostability of photosystem I (PSI) complexes Terasaki et al. (2007), Iwuchukwu et al. (2010), Kothe et al. (2013) . To assess the thermostability of PSI complexes from the thermophilic cyanobacterium Thermosynechococcus elongatus heating induced perturbations on the level of secondary structure of the proteins were studied. Changes were monitored by Fourier transform infrared (FT-IR) spectra in the mid-IR region upon slow heating (1°C per minute) of samples in D2O phosphate buffer (pD 7.4) from 20°C to 100°C. These spectra showed distinct changes in the Amide I region of PSI complexes as a function of the rising temperature. Absorbance at the Amide I maximum of PSI monomers (centered around 1653cm-1), gradually dropped in two temperature intervals, i.e. 60-75 and 80-90°C. In contrast, absorbance at the Amide I maximum of PSI trimers (around 1656cm-1) dropped only in one temperature interval 80-95°C. The thermal profile of the spectral shift of α-helices bands in the region 1656-1642cm-1 confirms the same two temperature intervals for PSI monomers and only one interval for trimers. Apparently, the observed absorbance changes at the Amide I maximum during heating of PSI monomers and trimers are caused by deformation and unfolding of α-helices. The absence of absorbance changes in the interval of 20-65°C in PSI trimers is probably caused by a greater stability of protein secondary structure as compared to that in monomers. Upon heating above 80°C a large part of α-helices both in trimers and monomers converts to unordered and aggregated structures. Spectral changes of PSI trimers and monomers heated up to 100°C are irreversible due to protein denaturation and non-specific aggregation of complexes leading to new absorption bands at 1618-1620cm-1. We propose that monomers shield the denaturation sensitive sides at the monomer/monomer interface within a trimer, making the oligomeric structure more stable against thermal stress.
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Affiliation(s)
- Vladimir V Shubin
- Baсh Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld.2, Leninsky Ave., Moscow 119071, Russia
| | - Irina V Terekhova
- Baсh Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld.2, Leninsky Ave., Moscow 119071, Russia.
| | - Yulia V Bolychevtseva
- Baсh Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 33, bld.2, Leninsky Ave., Moscow 119071, Russia
| | - Eithar El-Mohsnawy
- Biochemie der Pflanzen, Ruhr Universität Bochum, 44780 Bochum, Germany; Botany Department, Faculty of Science, Kafrelsheikh University, 33511 Kafrelsheikh, Egypt
| | - Matthias Rögner
- Biochemie der Pflanzen, Ruhr Universität Bochum, 44780 Bochum, Germany
| | - Werner Mäntele
- Institut für Biophysik, J.W. Goethe Universität Frankfurt, 60438 Frankfurt, Germany
| | - Marta J Kopczak
- Biochemie der Pflanzen, Ruhr Universität Bochum, 44780 Bochum, Germany
| | - Enela Džafić
- Institut für Biophysik, J.W. Goethe Universität Frankfurt, 60438 Frankfurt, Germany
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13
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Battchikova N, Angeleri M, Aro EM. Proteomic approaches in research of cyanobacterial photosynthesis. PHOTOSYNTHESIS RESEARCH 2015; 126:47-70. [PMID: 25359503 DOI: 10.1007/s11120-014-0050-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 10/18/2014] [Indexed: 05/03/2023]
Abstract
Oxygenic photosynthesis in cyanobacteria, algae, and plants is carried out by a fabulous pigment-protein machinery that is amazingly complicated in structure and function. Many different approaches have been undertaken to characterize the most important aspects of photosynthesis, and proteomics has become the essential component in this research. Here we describe various methods which have been used in proteomic research of cyanobacteria, and demonstrate how proteomics is implemented into on-going studies of photosynthesis in cyanobacterial cells.
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Affiliation(s)
- Natalia Battchikova
- Laboratory of Molecular Plant Biology, Department of Biochemistry, University of Turku, 20014, Turku, Finland.
| | - Martina Angeleri
- Laboratory of Molecular Plant Biology, Department of Biochemistry, University of Turku, 20014, Turku, Finland
| | - Eva-Mari Aro
- Laboratory of Molecular Plant Biology, Department of Biochemistry, University of Turku, 20014, Turku, Finland
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14
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Skandary S, Konrad A, Hussels M, Meixner AJ, Brecht M. Orientations between Red Antenna States of Photosystem I Monomers from Thermosynechococcus elongatus Revealed by Single-Molecule Spectroscopy. J Phys Chem B 2015. [DOI: 10.1021/acs.jpcb.5b04483] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sepideh Skandary
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Alexander Konrad
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Martin Hussels
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Alfred J. Meixner
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
| | - Marc Brecht
- IPTC
and Lisa+ Center, University of Tübingen, D-72076 Tübingen, Germany
- Zurich University of Applied Science (ZHAW), CH-8401 Winterthur, Switzerland
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15
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Karapetyan NV, Bolychevtseva YV, Yurina NP, Terekhova IV, Shubin VV, Brecht M. Long-wavelength chlorophylls in photosystem I of cyanobacteria: origin, localization, and functions. BIOCHEMISTRY (MOSCOW) 2014; 79:213-20. [PMID: 24821447 DOI: 10.1134/s0006297914030067] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The structural organization of photosystem I (PSI) complexes in cyanobacteria and the origin of the PSI antenna long-wavelength chlorophylls and their role in energy migration, charge separation, and dissipation of excess absorbed energy are discussed. The PSI complex in cyanobacterial membranes is organized preferentially as a trimer with the core antenna enriched with long-wavelength chlorophylls. The contents of long-wavelength chlorophylls and their spectral characteristics in PSI trimers and monomers are species-specific. Chlorophyll aggregates in PSI antenna are potential candidates for the role of the long-wavelength chlorophylls. The red-most chlorophylls in PSI trimers of the cyanobacteria Arthrospira platensis and Thermosynechococcus elongatus can be formed as a result of interaction of pigments peripherally localized on different monomeric complexes within the PSI trimers. Long-wavelength chlorophylls affect weakly energy equilibration within the heterogeneous PSI antenna, but they significantly delay energy trapping by P700. When the reaction center is open, energy absorbed by long-wavelength chlorophylls migrates to P700 at physiological temperatures, causing its oxidation. When the PSI reaction center is closed, the P700 cation radical or P700 triplet state (depending on the P700 redox state and the PSI acceptor side cofactors) efficiently quench the fluorescence of the long-wavelength chlorophylls of PSI and thus protect the complex against photodestruction.
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Affiliation(s)
- N V Karapetyan
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, 119071, Russia.
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16
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Kargul J, Janna Olmos JD, Krupnik T. Structure and function of photosystem I and its application in biomimetic solar-to-fuel systems. JOURNAL OF PLANT PHYSIOLOGY 2012; 169:1639-1653. [PMID: 22784471 DOI: 10.1016/j.jplph.2012.05.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 05/09/2012] [Accepted: 05/11/2012] [Indexed: 06/01/2023]
Abstract
Photosystem I (PSI) is one of the most efficient biological macromolecular complexes that converts solar energy into condensed energy of chemical bonds. Despite high structural complexity, PSI operates with a quantum yield close to 1.0 and to date, no man-made synthetic system approached this remarkable efficiency. This review highlights recent developments in dissecting molecular structure and function of the prokaryotic and eukaryotic PSI. It also overviews progress in the application of this complex as a natural photocathode for production of hydrogen within the biomimetic solar-to-fuel nanodevices.
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Affiliation(s)
- Joanna Kargul
- Department of Plant Molecular Physiology, University of Warsaw, ul. Miecznikowa 1, 02-096 Warsaw, Poland.
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17
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Gardian Z, Tichý J, Vácha F. Structure of PSI, PSII and antennae complexes from yellow-green alga Xanthonema debile. PHOTOSYNTHESIS RESEARCH 2011; 108:25-32. [PMID: 21455629 DOI: 10.1007/s11120-011-9647-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Accepted: 03/16/2011] [Indexed: 05/30/2023]
Abstract
Photosynthetic carbon fixation by Chromophytes is one of the significant components of a carbon cycle on the Earth. Their photosynthetic apparatus is different in pigment composition from that of green plants and algae. In this work we report structural maps of photosystem I, photosystem II and light harvesting antenna complexes isolated from a soil chromophytic alga Xanthonema debile (class Xanthophyceae). Electron microscopy of negatively stained preparations followed by single particle analysis revealed that the overall structure of Xanthophytes' PSI and PSII complexes is similar to that known from higher plants or algae. Averaged top-view projections of Xanthophytes' light harvesting antenna complexes (XLH) showed two groups of particles. Smaller ones that correspond to a trimeric form of XLH, bigger particles resemble higher oligomeric form of XLH.
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Affiliation(s)
- Zdenko Gardian
- Biology Centre ASCR, Branišovská 31, 370 05, České Budějovice, Czech Republic
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18
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Watanabe M, Kubota H, Wada H, Narikawa R, Ikeuchi M. Novel Supercomplex Organization of Photosystem I in Anabaena and Cyanophora paradoxa. ACTA ACUST UNITED AC 2010; 52:162-8. [DOI: 10.1093/pcp/pcq183] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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El-Mohsnawy E, Kopczak MJ, Schlodder E, Nowaczyk M, Meyer HE, Warscheid B, Karapetyan NV, Rögner M. Structure and function of intact photosystem 1 monomers from the cyanobacterium Thermosynechococcus elongatus. Biochemistry 2010; 49:4740-51. [PMID: 20359245 DOI: 10.1021/bi901807p] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Until now, the functional and structural characterization of monomeric photosystem 1 (PS1) complexes from Thermosynechococcus elongatus has been hampered by the lack of a fully intact PS1 preparation; for this reason, the three-dimensional crystal structure at 2.5 A resolution was determined with the trimeric PS1 complex [Jordan, P., et al. (2001) Nature 411 (6840), 909-917]. Here we show the possibility of isolating from this cyanobacterium the intact monomeric PS1 complex which preserves all subunits and the photochemical activity of the isolated trimeric complex. Moreover, the equilibrium between these complexes in the thylakoid membrane can be shifted by a high-salt treatment in favor of monomeric PS1 which can be quantitatively extracted below the phase transition temperature. Both monomers and trimers exhibit identical posttranslational modifications of their subunits and the same reaction centers but differ in the long-wavelength antenna chlorophylls. Their chlorophyll/P700 ratio (108 for the monomer and 112 for the trimer) is slightly higher than in the crystal structure, confirming mild preparation conditions. Interaction of antenna chlorophylls of the monomers within the trimer leads to a larger amount of long-wavelength chlorophylls, resulting in a higher photochemical activity of the trimers under red or far-red illumination. The dynamic equilibrium between monomers and trimers in the thylakoid membrane may indicate a transient monomer population in the course of biogenesis and could also be the basis for short-term adaptation of the cell to changing environmental conditions.
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20
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Kubota H, Sakurai I, Katayama K, Mizusawa N, Ohashi S, Kobayashi M, Zhang P, Aro EM, Wada H. Purification and characterization of photosystem I complex from Synechocystis sp. PCC 6803 by expressing histidine-tagged subunits. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1797:98-105. [PMID: 19751700 DOI: 10.1016/j.bbabio.2009.09.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 08/11/2009] [Accepted: 09/08/2009] [Indexed: 11/17/2022]
Abstract
We generated Synechocystis sp. PCC 6803 strains, designated F-His and J-His, which express histidine-tagged PsaF and PsaJ subunits, respectively, for simple purification of the photosystem I (PSI) complex. Six histidine residues were genetically added to the C-terminus of the PsaF subunit in F-His cells and the N-terminus of the PsaJ subunit in J-His cells. The histidine residues introduced had no apparent effect on photoautotrophic growth of the cells or the activity of PSI and PSII in thylakoid membranes. PSI complexes could be simply purified from the F-His and J-His cells by Ni2+-affinity column chromatography. When thylakoid membranes corresponding to 20 mg chlorophyll were used, PSI complexes corresponding to about 7 mg chlorophyll could be purified in both strains. The purified PSI complexes could be separated into monomers and trimers by ultracentrifugation in glycerol density gradient and high activity was recorded for trimers isolated from the F-His and J-His strains. Blue-Native PAGE and SDS-PAGE analysis of monomers and trimers indicated the existence of two distinct monomers with different subunit compositions and no contamination of PSI with other complexes, such as PSII and Cyt b(6)f. Further analysis of proteins and lipids in the purified PSI indicated the presence of novel proteins in the monomers and about six lipid molecules per monomer unit in the trimers. These results demonstrate that active PSI complexes can be simply purified from the constructed strains and the strains are very useful tools for analysis of PSI.
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Affiliation(s)
- Hisako Kubota
- Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan
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21
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Slavov C, El-Mohsnawy E, Rögner M, Holzwarth AR. Trapping kinetics in isolated cyanobacterial PS I complexes. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2008.12.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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Seelert H, Krause F. Preparative isolation of protein complexes and other bioparticles by elution from polyacrylamide gels. Electrophoresis 2008; 29:2617-36. [PMID: 18494038 DOI: 10.1002/elps.200800061] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Due to its unmatched resolution, gel electrophoresis is an indispensable tool for the analysis of diverse biomolecules. By adaptation of the electrophoretic conditions, even fragile protein complexes as parts of intracellular networks migrate through the gel matrix under sustainment of their integrity. If the thickness of such native gels is significantly increased compared to the analytical version, also high sample loads can be processed. However, the cage-like network obstructs an in-depth analysis for deciphering structure and function of protein complexes and other species. Consequently, the biomolecules have to be removed from the gel matrix into solution. Several approaches summarized in this review tackle this problem. While passive elution relies on diffusion processes, electroelution employs an electric field to force biomolecules out of the gel. An alternative procedure requires a special electrophoresis setup, the continuous elution device. In this apparatus, molecules migrate in the electric field until they leave the gel and were collected in a buffer stream. Successful isolation of diverse protein complexes like photosystems, ATP-dependent enzymes or active respiratory supercomplexes and some other bioparticles demonstrates the versatility of preparative electrophoresis. After liberating particles out of the gel cage, numerous applications are feasible. They include elucidation of the individual components up to high resolution structures of protein complexes. Therefore, preparative electrophoresis can complement standard purification methods and is in some cases superior to them.
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Affiliation(s)
- Holger Seelert
- Department of Chemistry, Physical Biochemistry, Technische Universität Darmstadt, Darmstadt, Germany.
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23
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Hydrogen ions directly regulating the oligomerization state of Photosystem I in intact Spirulina platensis cells. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s11434-008-0064-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Vacha F, Bumba L, Kaftan D, Vacha M. Microscopy and single molecule detection in photosynthesis. Micron 2005; 36:483-502. [PMID: 15951188 DOI: 10.1016/j.micron.2005.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Revised: 04/18/2005] [Accepted: 04/19/2005] [Indexed: 11/30/2022]
Abstract
Progress in various fields of microscopy techniques brought up enormous possibilities to study the photosynthesis down to the level of individual pigment-protein complexes. The aim of this review is to present recent developments in the photosynthesis research obtained using such highly advanced techniques. Three areas of microscopy techniques covering optical microscopy, electron microscopy and scanning probe microscopy are reviewed. Whereas the electron microscopy and scanning probe microscopy are used in photosynthesis mainly for structural studies of photosynthetic pigment-protein complexes, the optical microscopy is used also for functional studies.
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Affiliation(s)
- Frantisek Vacha
- Institute of Physical Biology, University of South Bohemia, Budejovice, Czech Republic.
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25
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Domonkos I, Malec P, Sallai A, Kovács L, Itoh K, Shen G, Ughy B, Bogos B, Sakurai I, Kis M, Strzalka K, Wada H, Itoh S, Farkas T, Gombos Z. Phosphatidylglycerol is essential for oligomerization of photosystem I reaction center. PLANT PHYSIOLOGY 2004; 134:1471-8. [PMID: 15064373 PMCID: PMC419823 DOI: 10.1104/pp.103.037754] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Our earlier studies with the pgsA mutant of Synechocystis PCC6803 demonstrated the important role of phosphatidylglycerol (PG) in PSII dimer formation and in electron transport between the primary and secondary electron-accepting plastoquinones of PSII. Using a long-term depletion of PG from pgsA mutant cells, we could induce a decrease not only in PSII but also in PSI activity. Simultaneously with the decrease in PSI activity, dramatic structural changes of the PSI complex were detected. A 21-d PG depletion resulted in the degradation of PSI trimers and concomitant accumulation of monomer PSI. The analyses of PSI particles isolated by MonoQ chromatography showed that, following the 21-d depletion, PSI trimers were no longer detectable in the thylakoid membranes. Immunoblot analyses revealed that the PSI monomers accumulating in the PG-depleted mutant cells do not contain PsaL, the protein subunit thought to be responsible for the trimer formation. Nevertheless, the trimeric structure of PSI reaction center could be restored by readdition of PG, even in the presence of the protein synthesis inhibitor lincomycin, indicating that free PsaL was present in thylakoid membranes following the 21-d PG depletion. Our data suggest an indispensable role for PG in the PsaL-mediated assembly of the PSI reaction center.
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Affiliation(s)
- Ildikó Domonkos
- Institute of Plant Biology, Biological Research Center of the Hungarian Academy of Sciences, H-6701 Szeged, Hungary.
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26
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Silva P, Thompson E, Bailey S, Kruse O, Mullineaux CW, Robinson C, Mann NH, Nixon PJ. FtsH is involved in the early stages of repair of photosystem II in Synechocystis sp PCC 6803. THE PLANT CELL 2003; 15:2152-64. [PMID: 12953117 PMCID: PMC181337 DOI: 10.1105/tpc.012609] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2003] [Accepted: 07/10/2003] [Indexed: 05/18/2023]
Abstract
When plants, algae, and cyanobacteria are exposed to excessive light, especially in combination with other environmental stress conditions such as extreme temperatures, their photosynthetic performance declines. A major cause of this photoinhibition is the light-induced irreversible photodamage to the photosystem II (PSII) complex responsible for photosynthetic oxygen evolution. A repair cycle operates to selectively replace a damaged D1 subunit within PSII with a newly synthesized copy followed by the light-driven reactivation of the complex. Net loss of PSII activity occurs (photoinhibition) when the rate of damage exceeds the rate of repair. The identities of the chaperones and proteases involved in the replacement of D1 in vivo remain uncertain. Here, we show that one of the four members of the FtsH family of proteases (cyanobase designation slr0228) found in the cyanobacterium Synechocystis sp PCC 6803 is important for the repair of PSII and is vital for preventing chronic photoinhibition. Therefore, the ftsH gene family is not functionally redundant with respect to the repair of PSII in this organism. Our data also indicate that FtsH binds directly to PSII, is involved in the early steps of D1 degradation, and is not restricted to the removal of D1 fragments. These results, together with the recent analysis of ftsH mutants of Arabidopsis, highlight the critical role played by FtsH proteases in the removal of damaged D1 from the membrane and the maintenance of PSII activity in vivo.
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Affiliation(s)
- Paulo Silva
- Department of Biological Sciences, Imperial College London, South Kensington Campus SW7 2AZ, United Kingdom
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27
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Bibby TS, Nield J, Barber J. Iron deficiency induces the formation of an antenna ring around trimeric photosystem I in cyanobacteria. Nature 2001; 412:743-5. [PMID: 11507643 DOI: 10.1038/35089098] [Citation(s) in RCA: 304] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Although iron is the fourth most abundant element in the Earth's crust, its concentration in the aquatic ecosystems-particularly the open oceans-is sufficiently low to limit photosynthetic activity and phytoplankton growth. Cyanobacteria, a major class of phytoplankton, respond to iron deficiency by expressing the 'iron-stress-induced' gene, isiA(ref. 3). The protein encoded by this gene has an amino-acid sequence that shows significant homology with one of the chlorophyll a-binding proteins (CP43) of photosystem II (PSII). The precise function of the CP43-like protein, here called CP43', has not been elucidated, although there have been many suggestions. Here we show that CP43' associates with photosystem I (PSI) to form a complex that consists of a ring of 18 CP43' molecules around a PSI trimer. This significantly increases the size of the light-harvesting system of PSI. The utilization of a PSII-like protein as an extra antenna for PSI emphasises the flexibility of cyanobacterial light-harvesting systems, and seems to be a strategy which compensates for the lowering of phycobilisome and PSI levels in response to iron deficiency.
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Affiliation(s)
- T S Bibby
- Wolfson Laboratories, Department of Biological Sciences, Imperial College of Science, Technology & Medicine, London, UK
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28
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Tucker DL, Sherman LA. Analysis of chlorophyll-protein complexes from the cyanobacterium Cyanothece sp. ATCC 51142 by non-denaturing gel electrophoresis. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1468:150-60. [PMID: 11018660 DOI: 10.1016/s0005-2736(00)00263-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The unicellular diazotrophic cyanobacterium, Cyanothece sp. ATCC 51142 temporally separates N(2) fixation from photosynthesis. We are analyzing the mechanism by which photosynthesis is down-regulated so that O(2) evolution is minimized during N(2) fixation. Previous results suggested changes in photosynthesis that are mediated through the redox poise of the plastoquinone pool (a process involving state transitions, in which the redistribution of excitation energy between the two photosystems helps to optimize photosynthetic yield) and the oligomerization state of the photosystems. Our working hypothesis was that the regulation of photosynthesis involved changes in the oligomerization of the photosystems. To analyze this hypothesis, we utilized a low-ionic strength, non-denaturing gel electrophoresis system to study the Chl-protein complexes. We determined that PSI is mostly trimeric, whereas PSII appears mainly as monomers. We demonstrated that most of the Chl-protein complexes in Cyanothece sp. remained constant throughout the diurnal cycle, except for the transient accumulation of a Chl-protein complex (band C) which appeared only during the late light period. Based on the size of this complex, band C represents either an interaction of PSI and PSII or a PSII dimer. These results provide support for the dynamic nature of the photosystems with respect to the diurnal cycle.
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Affiliation(s)
- D L Tucker
- Department of Botany and Microbiology, University of Oklahoma, Norman, OK 73019, USA
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29
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Karapetyan NV, Holzwarth AR, Rögner M. The photosystem I trimer of cyanobacteria: molecular organization, excitation dynamics and physiological significance. FEBS Lett 1999; 460:395-400. [PMID: 10556505 DOI: 10.1016/s0014-5793(99)01352-6] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The photosystem I complex organized in cyanobacterial membranes preferentially in trimeric form participates in electron transport and is also involved in dissipation of excess energy thus protecting the complex against photodamage. A small number of longwave chlorophylls in the core antenna of photosystem I are not located in the close vicinity of P700, but at the periphery, and increase the absorption cross-section substantially. The picosecond fluorescence kinetics of trimers resolved the fastest energy transfer components reflecting the equilibration processes in the core antenna at different redox states of P700. Excitation kinetics in the photosystem I bulk antenna is nearly trap-limited, whereas excitation trapping from longwave chlorophyll pools is diffusion-limited and occurs via the bulk antenna. Charge separation in the photosystem I reaction center is the fastest of all known reaction centers.
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Affiliation(s)
- N V Karapetyan
- A.N. Bakh Institute of Biochemistry, Russian Academy of Sciences, 117071, Moscow, Russia.
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30
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Kruip J, Karapetyan NV, Terekhova IV, Rögner M. In vitro oligomerization of a membrane protein complex. liposome-based reconstitution of trimeric photosystem I from isolated monomers. J Biol Chem 1999; 274:18181-8. [PMID: 10373417 DOI: 10.1074/jbc.274.26.18181] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Many membrane proteins can be isolated in different oligomeric forms. Photosystem I (PSI), for example, exists in cyanobacteria either as a monomeric or as a trimeric complex. Neither the factors responsible for the specific trimerization process nor its biological role are known at present. In the filamentous cyanobacterium Spirulina platensis, trimers in contrast to monomers show chlorophyll fluorescence emission at 760 nm. To investigate the oligomerization process as well as the nature of the long wavelength chlorophylls, we describe here an in vitro reconstitution procedure to assemble trimeric PS I from isolated purified PS I monomers. Monomers (and trimers) were extracted from S. platensis with n-dodecyl beta-D-maltoside and further purified by perfusion chromatography steps. The isolated complexes had the same polypeptide composition as other cyanobacteria (PsaA-PsaF and PsaI-PsaM), as determined from high resolution gels and immunoblotting. They were incorporated into proteoliposomes, which had been prepared by the detergent absorption method, starting from a phosphatidylcholine:phosphatidic acid mixture solubilized by octylglucoside. After the addition of monomeric PS I (lipid:chlorophyll, 25:1), octylglucoside was gradually removed by the stepwise addition of Biobeads. The 77 K fluorescence emission spectrum of these proteoliposomes displays a long wavelength emission at 760 nm that is characteristic of PS I trimers, which indicates for the first time the successful in vitro reconstitution of PS I trimers. In addition, a high performance liquid chromatography analysis of complexes extracted from these proteoliposomes confirms the formation of structural trimers. We also could show with this system 1) that at least one of the stromal subunits PsaC, -D, and -E is necessary for trimer formation and 2) that the extreme long wavelength emitting chlorophyll is formed as a result of trimer formation.
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Affiliation(s)
- J Kruip
- Faculty of Biology, Plant Biochemistry, Ruhr-University Bochum, D-44780 Bochum, Germany
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31
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Hippler M, Drepper F, Rochaix JD, Mühlenhoff U. Insertion of the N-terminal part of PsaF from Chlamydomonas reinhardtii into photosystem I from Synechococcus elongatus enables efficient binding of algal plastocyanin and cytochrome c6. J Biol Chem 1999; 274:4180-8. [PMID: 9933614 DOI: 10.1074/jbc.274.7.4180] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A strain of the cyanobacterium Synechococcus elongatus was generated that expresses a hybrid version of the photosystem I subunit PsaF consisting of the first 83 amino acids of PsaF from the green alga Chlamydomonas reinhardtii fused to the C-terminal portion of PsaF from S. elongatus. The corresponding modified gene was introduced into the genome of the psaF-deletion strain FK2 by cointegration with an antibiotic resistance gene. The transformants express a new PsaF subunit similar in size to PsaF from C. reinhardtii that is assembled into photosystem I (PSI). Hybrid PSI complexes isolated from these strains show an increase by 2 or 3 orders of magnitude in the rate of P700(+) reduction by C. reinhardtii cytochrome c6 or plastocyanin in 30% of the complexes as compared with wild type cyanobacterial PSI. The corresponding optimum second-order rate constants (k2 = 4.0 and 1.7 x 10(7) M1 s1 for cytochrome c6 and plastocyanin) are similar to those of PSI from C. reinhardtii. The remaining complexes are reduced at a slow rate similar to that observed with wild type PSI from S. elongatus and the algal donors. At high concentrations of C. reinhardtii cytochrome c6, a fast first-order kinetic component (t(1)/(2) = 4 microseconds) is revealed, indicative of intramolecular electron transfer within a complex between the hybrid PSI and cytochrome c6. This first-order phase is characteristic for P700(+) reduction by cytochrome c6 or plastocyanin in algae and higher plants. However, a similar fast phase is not detected for plastocyanin. Cross-linking studies show that, in contrast to PSI from wild type S. elongatus, the chimeric PsaF of PSI from the transformed strain cross-links to cytochrome c6 or plastocyanin with a similar efficiency as PsaF from C. reinhardtii PSI. Our data indicate that development of a eukaryotic type of reaction mechanism for binding and electron transfer between PSI and its electron donors required structural changes in both PSI and cytochrome c6 or plastocyanin.
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Affiliation(s)
- M Hippler
- Department of Molecular Biology and Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland
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Kamlowski A, Zech SG, Fromme P, Bittl R, Lubitz W, Witt HT, Stehlik D. The Radical Pair State in Photosystem I Single Crystals: Orientation Dependence of the Transient Spin-Polarized EPR Spectra. J Phys Chem B 1998. [DOI: 10.1021/jp9817022] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andreas Kamlowski
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Stephan G. Zech
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Petra Fromme
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Robert Bittl
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Wolfgang Lubitz
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Horst T. Witt
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Dietmar Stehlik
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, and Max-Volmer-Institut für Biophysikalische Chemie und Biochemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
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Fromme P, Witt HT. Improved isolation and crystallization of photosystem I for structural analysis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1998. [DOI: 10.1016/s0005-2728(98)00059-0] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pålsson LO, Flemming C, Gobets B, van Grondelle R, Dekker JP, Schlodder E. Energy transfer and charge separation in photosystem I: P700 oxidation upon selective excitation of the long-wavelength antenna chlorophylls of Synechococcus elongatus. Biophys J 1998; 74:2611-22. [PMID: 9591685 PMCID: PMC1299601 DOI: 10.1016/s0006-3495(98)77967-6] [Citation(s) in RCA: 128] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Photosystem I of the cyanobacterium Synechococcus elongatus contains two spectral pools of chlorophylls called C-708 and C-719 that absorb at longer wavelengths than the primary electron donor P700. We investigated the relative quantum yields of photochemical charge separation and fluorescence as a function of excitation wavelength and temperature in trimeric and monomeric photosystem I complexes of this cyanobacterium. The monomeric complexes are characterized by a reduced content of the C-719 spectral form. At room temperature, an analysis of the wavelength dependence of P700 oxidation indicated that all absorbed light, even of wavelengths of up to 750 nm, has the same probability of resulting in a stable P700 photooxidation. Upon cooling from 295 K to 5 K, the nonselectively excited steady-state emission increased by 11- and 16-fold in the trimeric and monomeric complexes, respectively, whereas the quantum yield of P700 oxidation decreased 2.2- and 1.7-fold. Fluorescence excitation spectra at 5 K indicate that the fluorescence quantum yield further increases upon scanning of the excitation wavelength from 690 nm to 710 nm, whereas the quantum yield of P700 oxidation decreases significantly upon excitation at wavelengths longer than 700 nm. Based on these findings, we conclude that at 5 K the excited state is not equilibrated over the antenna before charge separation occurs, and that approximately 50% of the excitations reach P700 before they become irreversibly trapped on one of the long-wavelength antenna pigments. Possible spatial organizations of the long-wavelength antenna pigments in the three-dimensional structure of photosystem I are discussed.
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Affiliation(s)
- L O Pålsson
- Department of Physics and Astronomy, Institute of Molecular Biological Sciences, Vrije Universiteit, Amsterdam, The Netherlands
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35
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Tsiotis G, Hager-Braun C, Wolpensinger B, Engel A, Hauska G. Structural analysis of the photosynthetic reaction center from the green sulfur bacterium Chlorobium tepidum. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1997. [DOI: 10.1016/s0005-2728(97)00073-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Schubert WD, Klukas O, Krauss N, Saenger W, Fromme P, Witt HT. Photosystem I of Synechococcus elongatus at 4 A resolution: comprehensive structure analysis. J Mol Biol 1997; 272:741-69. [PMID: 9368655 DOI: 10.1006/jmbi.1997.1269] [Citation(s) in RCA: 224] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
An improved structural model of the photosystem I complex from the thermophilic cyanobacterium Synechococcus elongatus is described at 4 A resolution. This represents the most complete model of a photosystem presently available, uniting both a photosynthetic reaction centre domain and a core antenna system. Most constituent elements of the electron transfer system have been located and their relative centre-to-centre distances determined at an accuracy of approximately 1 A. These include three pseudosymmetric pairs of Chla and three iron-sulphur centres, FX, FA and FB. The first pair, a Chla dimer, has been assigned to the primary electron donor P700. One or both Chla of the second pair, eC2 and eC'2, presumably functionally link P700 to the corresponding Chla of the third pair, eC3 and eC'3, which is assumed to constitute the spectroscopically-identified primary electron acceptor(s), A0, of PSI. A likely location of the subsequent phylloquinone electron acceptor, QK, in relation to the properties of the spectroscopically identified electron acceptor A1 is discussed. The positions of a total of 89 Chla, 83 of which constitute the core antenna system, are presented. The maximal centre-to-centre distance between antenna Chla is < or = 16 A; 81 Chla are grouped into four clusters comprising 21, 23, 17 and 20 Chla, respectively. Two "connecting" Chla are positioned to structurally (and possibly functionally) link the Chla of the core antenna to those of the electron transfer system. Thus the second and third Chla pairs of the electron transfer system may have a dual function both in energy transfer and electron transport. A total of 34 transmembrane and nine surface alpha-helices have been identified and assigned to the 11 subunits of the PSI complex. The connectivity of the nine C-terminal (seven transmembrane, two "surface") alpha-helices of each of the large core subunits PsaA and PsaB is described. The assignment of the amino acid sequence to the transmembrane alpha-helices is proposed and likely residues involved in co-ordinating the Chla of the electron transfer system discussed.
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Affiliation(s)
- W D Schubert
- Institut für Kristallographie, Freie Universität Berlin, Germany
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Cladera J, Rigaud JL, Bottin H, Duñach M. Functional reconstitution of photosystem I reaction center from cyanobacterium Synechocystis sp PCC6803 into liposomes using a new reconstitution procedure. J Bioenerg Biomembr 1996; 28:503-15. [PMID: 8953382 DOI: 10.1007/bf02110440] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Photosystem I reaction center from the cyanobacterium Synechocystis sp PCC6803 was reconstituted into phosphatidylcholine/phosphatidic acid liposomes. Liposomes prepared by reversephase evaporation were treated with various amounts of different detergents and protein incorporation was analyzed at each step of the solubilization process. After detergent removal the activities of the resulting proteoliposomes were measured. The most efficient reconstitution was obtained by insertion of the protein complex into preformed liposomes destabilized by saturating amounts of octylglucoside. In the presence of N-methylphenazonium methosulfate and ascorbic acid, liposomes containing the reaction center catalyzed a light-dependent net H+ uptake as measured by the 9-aminoacridine fluorescence quenching and the pH meter. An important benefit of the new reconstitution procedure is that it produces a homogeneous population of large-size proteoliposomes with a low ionic permeability and with a majority inwardly directed H+ transport activity. In optimal conditions, a light-induced delta pH of about 1.8 units could be sustained at 20 degrees C in the presence of valinomycin. In the absence of valinomycin, a "back-pressure" effect of an electrical transmembrane potential decreased both the rate and the extent of the H+ transport. The reaction center was also co-reconstituted with F0F1 H(+)-ATPases from chloroplasts and from the thermophilic bacterium, PS3. The co-reconstituted system was shown to catalyze a light-dependent phosphorylation which could only be measured in the presence of a high concentration of PSI (low lipid/PSI ratios) while no delta pH could be detected.
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Affiliation(s)
- J Cladera
- Department de Bioquímica i Biologia Molecular, Universitat Autonoma de Barcelona, Bellaterra, Spain
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Krauss N, Schubert WD, Klukas O, Fromme P, Witt HT, Saenger W. Photosystem I at 4 A resolution represents the first structural model of a joint photosynthetic reaction centre and core antenna system. NATURE STRUCTURAL BIOLOGY 1996; 3:965-73. [PMID: 8901876 DOI: 10.1038/nsb1196-965] [Citation(s) in RCA: 287] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The 4 A X-ray structure model of trimeric photosystem I of the cyanobacterium Synechococcus elongatus reveals 31 transmembrane, nine surface and three stromal alpha-helices per monomer, assigned to the 11 protein subunits: PsaA and PsaB are related by a pseudo two-fold axis normal to the membrane plane, along which the electron transfer pigments are arranged. 65 antenna chlorophyll a (Chl a) molecules separated by < or = 16 A form an oval, clustered net continuous with the electron transfer chain through the second and third Chl a pairs of the electron transfer system. This suggests a dual role for these Chl a both in excitation energy and electron transfer. The architecture of the protein core indicates quinone and iron-sulphur type reaction centres to have a common ancestor.
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Affiliation(s)
- N Krauss
- Institut für Kristallographie, Freie Universität Berlin, Germany
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Turconi S, Kruip J, Schweitzer G, Rögner M, Holzwarth AR. A comparative fluorescence kinetics study of Photosystem I monomers and trimers from Synechocystis PCC 6803. PHOTOSYNTHESIS RESEARCH 1996; 49:263-268. [PMID: 24271704 DOI: 10.1007/bf00034787] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/1995] [Accepted: 07/30/1996] [Indexed: 06/02/2023]
Abstract
Picosecond time-resolved fluorescence measurements have been performed as a function of emission wavelengths in order to investigate the possible functional differences between monomeric and trimeric Photosystem I (PS I) particles from a cyanobacterium Synechocystis. Applying global analysis, four kinetic components were found necessary to describe the fluorescecne decay for both monomers and trimers of PS I. The lifetimes and spectra of the respective components are quite similar, indicating that they can be attributed to identical processes in both the monomers and trimers. It is concluded that both forms of PS I are capable of efficient energy transfer and charge separation, in agreement with a physiological role of both forms. Small differences in the fluorescence decays are discussed in terms of a slightly higher ratio of red emitting pigments per reaction centre in trimers of PS I. A comparison to Synechococcus PS I particles reveals the higher red chlorophyll content of the latter.
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Affiliation(s)
- S Turconi
- Max-Planck-Institut für Strahlenchemie, Stiftstr. 34-36, D-45470, Mülheim a. d. Ruhr, Germany
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40
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Mühlenhoff U, Chauvat F. Gene transfer and manipulation in the thermophilic cyanobacterium Synechococcus elongatus. MOLECULAR & GENERAL GENETICS : MGG 1996; 252:93-100. [PMID: 8804408 DOI: 10.1007/bf02173209] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
DNA can be introduced into the thermophilic cyanobacterium Synechococcus elongatus by electroporation or conjugation. Its genome can be readily manipulated through integrative transformation or by using promiscuous RSF1010-derived plasmids that can be transferred unaltered between Escherichia coli and Synechococcus elongatus. These vectors can therefore be used for in vivo studies of cyanobacterial proteins in both mesophilic and thermophilic cyanobacterial backgrounds. As a preliminary step towards the analysis of structure-function relationships of photosystem I (PSI) from this thermophile, the genes encoding the PSI subunits PsaF, PsaL, and PsaK were inactivated and shown to be non-essential in S. elongatus. In addition, PSI reaction centres were extracted from a psaL- strain exclusively as monomeric complexes.
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Affiliation(s)
- U Mühlenhoff
- Biologisches Institut II, Universität Freiburg, Germany
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41
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Bald D, Kruip J, Rögner M. Supramolecular architecture of cyanobacterial thylakoid membranes: How is the phycobilisome connected with the photosystems? PHOTOSYNTHESIS RESEARCH 1996; 49:103-18. [PMID: 24271608 DOI: 10.1007/bf00117661] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/1996] [Accepted: 06/25/1996] [Indexed: 05/06/2023]
Abstract
Cyanobacteria, as the most simple organisms to perform oxygenic photosynthesis differ from higher plants especially with respect to the thylakoid membrane structure and the antenna system used to capture light energy. Cyanobacterial antenna systems, the phycobilisomes (PBS), have been shown to be associated with Photosystem 2 (PS 2) at the cytoplasmic side, forming a PS 2-PBS-supercomplex, the structure of which is not well understood. Based on structural data of PBS and PS 2, a model for such a supercomplex is presented. Its key features are the PS 2 dimer as prerequisite for formation of the supercomplex and the antiparallel orientation of PBS-cores and the two PS 2 monomers which form the 'contact area' within the supercomplex. Possible consequences for the formation of 'superstructures' (PS 2-PBS rows) within the thylakoid membrane under so-called 'state 1' conditions are discussed. As there are also indications for specific functional connections of PBS with Photosystem 1 (PS 1) under so-called 'state 2' conditions, we show a model which reconciles the need for a structural interaction between PBS and PS 1 with the difference in structural symmetry (2-fold rotational symmetry of PBS-cores, 3-fold rotational symmetry of trimeric PS 1). Finally, the process of dynamic coupling and uncoupling of PBS to PS 1 and PS 2, based on the presented models, shows analogies to mechanisms for the regulation of photosynthetic electron flow in higher plants-despite the very different organization of their thylakoid membranes in comparison to cyanobacteria.
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Affiliation(s)
- D Bald
- Institute of Botany, University of Münster, Schlossgarten 3, D-48149, Münster, Germany
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42
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Käβ H, Fromme P, Lubitz W. Quadrupole parameters of nitrogen nuclei in the cation radical P700.+ determined by ESEEM of single crystals of phtosystem I. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00533-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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43
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Fromme P, Witt H, Schubert WD, Klukas O, Saenger W, Krauβ N. Structure of Photosystem I at 4.5 Å resolution: a short review including evolutionary aspects. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1996. [DOI: 10.1016/0005-2728(96)00053-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Jekow P, Fromme P, Witt HT, Saenger W. Photosystem I from Synechococcus elongatus: preparation and crystallization of monomers with varying subunit compositions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1995. [DOI: 10.1016/0005-2728(94)00201-f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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45
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Structure of Photosystem I: Suggestions on the docking sites for plastocyanin, ferredoxin and the coordination of P700. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1994. [DOI: 10.1016/0005-2728(94)90092-2] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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46
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Kruip J, Bald D, Boekema E, Rögner M. Evidence for the existence of trimeric and monomeric Photosystem I complexes in thylakoid membranes from cyanobacteria. PHOTOSYNTHESIS RESEARCH 1994; 40:279-286. [PMID: 24309946 DOI: 10.1007/bf00034777] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/1993] [Accepted: 02/22/1994] [Indexed: 06/02/2023]
Abstract
In cyanobacteria, solubilization of thylakoid membranes by detergents yields both monomeric and trimeric Photosystem I (PS I) complexes in variable amounts. We present evidence for the existence of both monomeric and trimeric PS I in cyanobacterial thylakoid membranes with the oligomeric state depending 'in vitro' on the ion concentration. At low salt concentrations (i.e.≤10 mM MgSO4) PS I is mainly extracted as a trimer from these membranes and at high salt concentrations (i.e.≥150 mM MgSO4) nearly exclusively as a monomer, irrespective of the type of salt used (i.e. mono- or bivalent ions) and the temperature (i.e. 4°C or 20°C). Once solubilized, the PS I trimer is stable over a wide range of ion concentrations (i.e. beyond 0.5 M). A model is presented which suggests a monomer-oligomer equilibrium of PS I, but also of PS II and the cyt. b6/f-complex in the cyanobacterial thylakoid membrane. The possible physiological role of this equilibrium in the regulation of state transitions is discussed.
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Affiliation(s)
- J Kruip
- Institute of Botany, University of Münster, Schlossgarten 3, D-48149, Münster, Germany
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48
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Kerfeld CA, Yeates TO, Thornber JP. Biochemical and spectroscopic characterization of the reaction center-LH1 complex and the carotenoid-containing B820 subunit of Chromatium purpuratum. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1185:193-202. [PMID: 8167136 DOI: 10.1016/0005-2728(94)90210-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Two complexes, the reaction center light-harvesting complex 1 (RC-LH1) and the B820 subunit of the LH1, have been isolated and characterized from the purple-sulfur photosynthetic bacterium Chromatium purpuratum. The RC-LH1 consists of the B870 antenna and a P-870 RC with an associated tetraheme cytochrome. This complex can be further fractionated to yield the B820 subunit of the LH1. The C. purpuratum B820 subunit is the first isolated from a purple-sulfur bacterium. It is also the first that retains its carotenoid absorption properties. CD spectra in the Qy region of bacteriochlorophyll a in both the RC-LH1 and the B820 subunit are bathochromically shifted as compared to other such complexes. Comparison of the sequence of the LH1 beta polypeptide to other LH1 beta s reveals the presence of additional aromatic amino acids in the vicinity of both of the conserved histidines in the C. purpuratum beta polypeptide. The CD spectra of these C. purpuratum pigment-protein complexes can be interpreted in terms of exciton interaction between bacteriochlorophylls in the B820 subunit of the LH1 and in the B870, with additional spectral characteristics arising from interactions of the pigments with their protein environment.
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Affiliation(s)
- C A Kerfeld
- Department of Biology, University of California, Los Angeles 90024-1570
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49
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Boekema EJ, Boonstra AF, Dekker JP, Rögner M. Electron microscopic structural analysis of Photosystem I, Photosystem II, and the cytochrome b6/f complex from green plants and cyanobacteria. J Bioenerg Biomembr 1994; 26:17-29. [PMID: 8027020 DOI: 10.1007/bf00763217] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Electron microscopy (EM) in combination with image analysis is a powerful technique to study protein structure at low- and high resolution. Since electron micrographs of biological objects are very noisy, substantial improvement of image quality can be obtained by averaging individual projections. Crystallographic and noncrystallographic averaging methods are available and have been applied to study projections of the large protein complexes embedded in photosynthetic membranes from cyanobacteria and higher plants. Results of EM on monomeric and trimeric Photosystem I complexes, on monomeric and dimeric Photosystem II complexes, and on the monomeric cytochrome b6/f complex are discussed.
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Affiliation(s)
- E J Boekema
- BIOSON Research Institute, University of Groningen, The Netherlands
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50
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Lüneberg J, Fromme P, Jekow P, Schlodder E. Spectroscopic characterization of PS I core complexes from thermophilic Synechococcus sp. Identical reoxidation kinetics of A1- before and after removal of the iron-sulfur-clusters FA and FB. FEBS Lett 1994; 338:197-202. [PMID: 8307180 DOI: 10.1016/0014-5793(94)80364-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Monomeric and trimeric PS I complexes missing the three stromal subunits E,C and D (termed PS I core complexes) were prepared from the thermophilic cyanobacterium Synechococcus sp. by incubation with urea. The subunits E,C and D are sequentially removed. In the monomeric PS I the subunit C is removed with a half life of approx. 5 min. This is about eight times faster than in the trimeric PS I complex. In parallel with the removal of the FA/B containing subunit C the reduction kinetics of P700+ changed from a half life of about 25 ms to about 750 microseconds. The partner of P700+ in the 750 microseconds charge recombination was identified to be FX by the difference spectrum of this phase. There are some minor differences in the spectra of trimeric and monomeric PS I core complexes. At 77K the forward electron transfer from A1- to FX is blocked in the major fraction of the PS I core complexes and P700+ A1- recombines with a half life of about 220 microseconds. In the remaining fraction P700+FX- is formed and decays with a half life of approx. 10 ms at 77 K. The kinetics of the forward electron transfer from A1- to the iron-sulfur-clusters was measured in the native PS I and the corresponding core complexes. The reoxidation kinetics of A1- are identical in both cases (t1/2 = 180 ns). We conclude that FX is an obligatory intermediate in the normal forward electron transfer.
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Affiliation(s)
- J Lüneberg
- Max-Volmer-Institut für Biophysikalische und Physikalische Chemie, Technische Universität Berlin, Germany
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