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Lagunes L, Briggs K, Martin-Holder P, Xu Z, Maurer D, Ghabra K, Deeds EJ. Modeling reveals the strength of weak interactions in stacked-ring assembly. Biophys J 2024; 123:1763-1780. [PMID: 38762753 PMCID: PMC11267433 DOI: 10.1016/j.bpj.2024.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 04/30/2024] [Accepted: 05/15/2024] [Indexed: 05/20/2024] Open
Abstract
Cells employ many large macromolecular machines for the execution and regulation of processes that are vital for cell and organismal viability. Interestingly, cells cannot synthesize these machines as functioning units. Instead, cells synthesize the molecular parts that must then assemble into the functional complex. Many important machines, including chaperones such as GroEL and proteases such as the proteasome, comprise protein rings that are stacked on top of one another. While there is some experimental data regarding how stacked-ring complexes such as the proteasome self-assemble, a comprehensive understanding of the dynamics of stacked-ring assembly is currently lacking. Here, we developed a mathematical model of stacked-trimer assembly and performed an analysis of the assembly of the stacked homomeric trimer, which is the simplest stacked-ring architecture. We found that stacked rings are particularly susceptible to a form of kinetic trapping that we term "deadlock," in which the system gets stuck in a state where there are many large intermediates that are not the fully assembled structure but that cannot productively react. When interaction affinities are uniformly strong, deadlock severely limits assembly yield. We thus predicted that stacked rings would avoid situations where all interfaces in the structure have high affinity. Analysis of available crystal structures indicated that indeed the majority-if not all-of stacked trimers do not contain uniformly strong interactions. Finally, to better understand the origins of deadlock, we developed a formal pathway analysis and showed that, when all the binding affinities are strong, many of the possible pathways are utilized. In contrast, optimal assembly strategies utilize only a small number of pathways. Our work suggests that deadlock is a critical factor influencing the evolution of macromolecular machines and provides general principles for understanding the self-assembly efficiency of existing machines.
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Affiliation(s)
- Leonila Lagunes
- Department of Integrative Biology and Physiology, UCLA, Los Angeles, California; Institute for Quantitative and Computational Biosciences, UCLA, Los Angeles, California
| | - Koan Briggs
- Department of Physics, University of Kansas, Lawrence, Kansas
| | - Paige Martin-Holder
- Department of Molecular Immunology, Microbiology and Genetics, UCLA, Los Angeles, California
| | - Zaikun Xu
- Center for Computational Biology, University of Kansas, Lawrence, Kansas
| | - Dustin Maurer
- Center for Computational Biology, University of Kansas, Lawrence, Kansas
| | - Karim Ghabra
- Computational and Systems Biology IDP, UCLA, Los Angeles, California
| | - Eric J Deeds
- Department of Integrative Biology and Physiology, UCLA, Los Angeles, California; Institute for Quantitative and Computational Biosciences, UCLA, Los Angeles, California; Center for Computational Biology, University of Kansas, Lawrence, Kansas.
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2
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Li L, Xie G, Dong P, Tang H, Wu L, Zhang L. Anticyanobacterial effect of p-coumaric acid on Limnothrix sp. determined by proteomic and metabolomic analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 926:171632. [PMID: 38471589 DOI: 10.1016/j.scitotenv.2024.171632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 02/23/2024] [Accepted: 03/08/2024] [Indexed: 03/14/2024]
Abstract
Regulating photosynthetic machinery is a powerful but challenging strategy for selectively inhibiting bloom-forming cyanobacteria, in which photosynthesis mainly occurs in thylakoids. P-coumaric acid (p-CA) has several biological properties, including free radical scavenging and antibacterial effects, and studies have shown that it can damage bacterial cell membranes, reduce chlorophyll a in cyanobacteria, and effectively inhibit algal growth at concentrations exceeding 0.127 g/L. Allelochemicals typically inhibit cyanobacteria by inhibiting photosynthesis; however, research on inhibiting harmful algae using phenolic acids has focused mainly on their inhibitory and toxic effects and metabolite levels, and the molecular mechanism by which p-CA inhibits photosynthesis remains unclear. Thus, we examined the effect of p-CA on the photosynthesis of Limnothrix sp. in detail. We found that p-CA inhibits algal growth and damages photosynthesis-related proteins in Limnothrix sp., reduces carotenoid and allophycocyanin levels, and diminishes the actual quantum yield of Photosystem II (PSII). Moreover, p-CA significantly altered algal cell membrane protein systems, and PSII loss resulting from p-CA exposure promoted reactive oxygen species production. It significantly altered algae cell membrane protein systems. Finally, p-CA was found to be environmentally nontoxic; 80 % of 48-h-old Daphnia magna larvae survived when exposed to 0.15 g/L p-CA. These findings provide insight into the mechanism of cyanobacterial inhibition by p-CA, providing a more practical approach to controlling harmful algal blooms.
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Affiliation(s)
- Lingzhi Li
- College of Environment and Ecology, Chongqing University, Chongqing 400044, China
| | - Gengxin Xie
- College of Environment and Ecology, Chongqing University, Chongqing 400044, China.
| | - Pan Dong
- School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Hui Tang
- College of Environment and Ecology, Chongqing University, Chongqing 400044, China
| | - Liping Wu
- College of Environment and Ecology, Chongqing University, Chongqing 400044, China
| | - Liang Zhang
- College of Environment and Ecology, Chongqing University, Chongqing 400044, China
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Bhattacharjee S, Arra S, Daidone I, Pantazis DA. Excitation landscape of the CP43 photosynthetic antenna complex from multiscale simulations. Chem Sci 2024; 15:7269-7284. [PMID: 38756808 PMCID: PMC11095388 DOI: 10.1039/d3sc06714a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 04/07/2024] [Indexed: 05/18/2024] Open
Abstract
Photosystem II (PSII), the principal enzyme of oxygenic photosynthesis, contains two integral light harvesting proteins (CP43 and CP47) that bind chlorophylls and carotenoids. The two intrinsic antennae play crucial roles in excitation energy transfer and photoprotection. CP43 interacts most closely with the reaction center of PSII, specifically with the branch of the reaction center (D1) that is responsible for primary charge separation and electron transfer. Deciphering the function of CP43 requires detailed atomic-level insights into the properties of the embedded pigments. To advance this goal, we employ a range of multiscale computational approaches to determine the site energies and excitonic profile of CP43 chlorophylls, using large all-atom models of a membrane-bound PSII monomer. In addition to time-dependent density functional theory (TD-DFT) used in the context of a quantum-mechanics/molecular-mechanics setup (QM/MM), we present a thorough analysis using the perturbed matrix method (PMM), which enables us to utilize information from long-timescale molecular dynamics simulations of native PSII-complexed CP43. The excited state energetics and excitonic couplings have both similarities and differences compared with previous experimental fits and theoretical calculations. Both static TD-DFT and dynamic PMM results indicate a layered distribution of site energies and reveal specific groups of chlorophylls that have shared contributions to low-energy excitations. Importantly, the contribution to the lowest energy exciton does not arise from the same chlorophylls at each system configuration, but rather changes as a function of conformational dynamics. An unexpected finding is the identification of a low-energy charge-transfer excited state within CP43 that involves a lumenal (C2) and the central (C10) chlorophyll of the complex. The results provide a refined basis for structure-based interpretation of spectroscopic observations and for further deciphering excitation energy transfer in oxygenic photosynthesis.
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Affiliation(s)
- Sinjini Bhattacharjee
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Srilatha Arra
- Department of Physical and Chemical Sciences, University of L'Aquila Via Vetoio (Coppito 1) 67010 L'Aquila Italy
| | - Isabella Daidone
- Department of Physical and Chemical Sciences, University of L'Aquila Via Vetoio (Coppito 1) 67010 L'Aquila Italy
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
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4
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Trotti J, Trapani I, Gulino F, Aceto M, Minio M, Gerotto C, Mica E, Valè G, Barbato R, Pagliano C. Physiological Responses to Salt Stress at the Seedling Stage in Wild ( Oryza rufipogon Griff.) and Cultivated ( Oryza sativa L.) Rice. PLANTS (BASEL, SWITZERLAND) 2024; 13:369. [PMID: 38337902 PMCID: PMC10857172 DOI: 10.3390/plants13030369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/05/2024] [Accepted: 01/24/2024] [Indexed: 02/12/2024]
Abstract
Domesticated rice Oryza sativa L. is a major staple food worldwide, and the cereal most sensitive to salinity. It originated from the wild ancestor Oryza rufipogon Griff., which was reported to possess superior salinity tolerance. Here, we examined the morpho-physiological responses to salinity stress (80 mM NaCl for 7 days) in seedlings of an O. rufipogon accession and two Italian O. sativa genotypes, Baldo (mildly tolerant) and Vialone Nano (sensitive). Under salt treatment, O. rufipogon showed the highest percentage of plants with no to moderate stress symptoms, displaying an unchanged shoot/root biomass ratio, the highest Na+ accumulation in roots, the lowest root and leaf Na+/K+ ratio, and highest leaf relative water content, leading to a better preservation of the plant architecture, ion homeostasis, and water status. Moreover, O. rufipogon preserved the overall leaf carbon to nitrogen balance and photosynthetic apparatus integrity. Conversely, Vialone Nano showed the lowest percentage of plants surviving after treatment, and displayed a higher reduction in the growth of shoots rather than roots, with leaves compromised in water and ionic balance, negatively affecting the photosynthetic performance (lowest performance index by JIP-test) and apparatus integrity. Baldo showed intermediate salt tolerance. Being O. rufipogon interfertile with O. sativa, it resulted a good candidate for pre-breeding towards salt-tolerant lines.
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Affiliation(s)
- Jacopo Trotti
- Department for Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant’Eusebio 5, 13100 Vercelli, Italy; (J.T.); (F.G.); (M.A.); (E.M.); (G.V.); (R.B.)
| | - Isabella Trapani
- Department of Science and Technological Innovation, University of Eastern Piedmont, Viale Teresa Michel 5, 15121 Alessandria, Italy
| | - Federica Gulino
- Department for Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant’Eusebio 5, 13100 Vercelli, Italy; (J.T.); (F.G.); (M.A.); (E.M.); (G.V.); (R.B.)
| | - Maurizio Aceto
- Department for Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant’Eusebio 5, 13100 Vercelli, Italy; (J.T.); (F.G.); (M.A.); (E.M.); (G.V.); (R.B.)
| | - Miles Minio
- Department of Life and Environmental Sciences, Marche Polytechnic University, Via Brecce Bianche, 60131 Ancona, Italy; (M.M.); (C.G.)
| | - Caterina Gerotto
- Department of Life and Environmental Sciences, Marche Polytechnic University, Via Brecce Bianche, 60131 Ancona, Italy; (M.M.); (C.G.)
| | - Erica Mica
- Department for Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant’Eusebio 5, 13100 Vercelli, Italy; (J.T.); (F.G.); (M.A.); (E.M.); (G.V.); (R.B.)
| | - Giampiero Valè
- Department for Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant’Eusebio 5, 13100 Vercelli, Italy; (J.T.); (F.G.); (M.A.); (E.M.); (G.V.); (R.B.)
| | - Roberto Barbato
- Department for Sustainable Development and Ecological Transition, University of Eastern Piedmont, Piazza Sant’Eusebio 5, 13100 Vercelli, Italy; (J.T.); (F.G.); (M.A.); (E.M.); (G.V.); (R.B.)
| | - Cristina Pagliano
- Department of Science and Technological Innovation, University of Eastern Piedmont, Viale Teresa Michel 5, 15121 Alessandria, Italy
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Krysiak S, Gotić M, Madej E, Moreno Maldonado AC, Goya GF, Spiridis N, Burda K. The effect of ultrafine WO 3 nanoparticles on the organization of thylakoids enriched in photosystem II and energy transfer in photosystem II complexes. Microsc Res Tech 2023; 86:1583-1598. [PMID: 37534550 DOI: 10.1002/jemt.24394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 08/04/2023]
Abstract
In this work, a new approach to construct self-assembled hybrid systems based on natural PSII-enriched thylakoid membranes (PSII BBY) is demonstrated. Superfine m-WO3 NPs (≈1-2 nm) are introduced into PSII BBY. Transmission electron microscopy (TEM) measurements showed that even the highest concentrations of NPs used did not degrade the PSII BBY membranes. Using atomic force microscopy (AFM), it is shown that the organization of PSII BBY depends strongly on the concentration of NPs applied. This proved that the superfine NPs can easily penetrate the thylakoid membrane and interact with its components. These changes are also related to the modified energy transfer between the external light-harvesting antennas and the PSII reaction center, shown by absorption and fluorescence experiments. The biohybrid system shows stability at pH 6.5, the native operating environment of PSII, so a high rate of O2 evolution is expected. In addition, the light-induced water-splitting process can be further stimulated by the direct interaction of superfine WO3 NPs with the donor and acceptor sides of PSII. The water-splitting activity and stability of this colloidal system are under investigation. RESEARCH HIGHLIGHTS: The phenomenon of the self-organization of a biohybrid system composed of thylakoid membranes enriched in photosystem II and superfine WO3 nanoparticles is studied using AFM and TEM. A strong dependence of the organization of PSII complexes within PSII BBY membranes on the concentration of NPs applied is observed. This observation turns out to be crucial to understand the complexity of the mechanism of the action of WO3 NPs on modifications of energy transfer from external antenna complexes to the PSII reaction center.
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Affiliation(s)
- S Krysiak
- Faculty of Physics and Applied Computer Science, AGH - University of Krakow, Krakow, Poland
| | - M Gotić
- Division of Materials Physics, Ruđer Bošković Institute, Zagreb, Croatia
| | - E Madej
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow, Poland
| | - A C Moreno Maldonado
- Condensed Matter Physics Department and Instituto de Nanociencia y Materiales de Aragón, Universidad de Zaragoza, Zaragoza, Spain
| | - G F Goya
- Condensed Matter Physics Department and Instituto de Nanociencia y Materiales de Aragón, Universidad de Zaragoza, Zaragoza, Spain
| | - N Spiridis
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow, Poland
| | - K Burda
- Faculty of Physics and Applied Computer Science, AGH - University of Krakow, Krakow, Poland
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6
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Zhang M, Rao Y, Chen X, Shi Y, Wei C, Wang X, Wang L, Xie C, Pan C, Chen J. Function verification of a chlorophyll a/b binding protein gene through a newly established tobacco rattle virus-induced gene silencing system in Kandelia obovata. FRONTIERS IN PLANT SCIENCE 2023; 14:1245555. [PMID: 37854114 PMCID: PMC10579580 DOI: 10.3389/fpls.2023.1245555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 09/06/2023] [Indexed: 10/20/2023]
Abstract
As an important mangrove species, Kandelia obovata plays an irreplaceable role in the coastal ecosystem. However, due to a lack of genetic technology, there is limited research on its functional genes. As such, establishing an efficient and rapid functional verification system is particularly important. In this study,tobacco rattle virus (TRV) and the phytoene desaturase gene KoPDS were used as the vector and target gene, respectively, to establish a virus-induced gene silencing system (VIGS) in K. obovata. Besides, the system was also used to verify the role of a Chlorophyll a/b binding protein (Cab) gene KoCAB in leaf carbon sequestration of K. obovata. RNA-Seq and qRT-PCR showed that the highest gene-silencing efficiency could reach 90% after 10 days of inoculation and maintain above 80% after 15 days, which was achieved with resuspension buffer at pH 5.8 and Agrobacterium culture at OD600 of 0.4-0.6. Taken together, the TRV-mediated VIGS system established herein is the first genetic analysis tool for mangroves, which may greatly impel functional genomics studies in mangrove plants.
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Affiliation(s)
- Mingxiong Zhang
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
- College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuhui Rao
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Xiaofeng Chen
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Yunrui Shi
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Chonglong Wei
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Xianfeng Wang
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Lu Wang
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
- Technology Innovation Center for Monitoringand Restoration Engineering of Ecological Fragile Zonein Southeast China, Ministry of Natural Resources, Fuzhou, China
| | - Chengjin Xie
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
- College of Environment and Safety Engineering, Fuzhou University, Fuzhou, China
| | - Chenglang Pan
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
- Technology Innovation Center for Monitoringand Restoration Engineering of Ecological Fragile Zonein Southeast China, Ministry of Natural Resources, Fuzhou, China
| | - Jianming Chen
- Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, China
- Technology Innovation Center for Monitoringand Restoration Engineering of Ecological Fragile Zonein Southeast China, Ministry of Natural Resources, Fuzhou, China
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7
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Song Y, Liu W, Wang Z, He S, Jia W, Shen Y, Sun Y, Xu Y, Wang H, Shang W. Effect of Different Monochromatic LEDs on the Environmental Adaptability of Spathiphyllum floribundum and Chrysanthemum morifolium. PLANTS (BASEL, SWITZERLAND) 2023; 12:2964. [PMID: 37631175 PMCID: PMC10459178 DOI: 10.3390/plants12162964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/13/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023]
Abstract
Light-emitting diodes (LEDs) can be programmed to provide specialized light sources and spectra for plant growth. UV-A (397.6 nm), blue (460.6 nm), green (520.7 nm), and red (661.9 nm) LED light sources were used to study the effects of different monochromatic lights on the growth, antioxidant system, and photosynthetic characteristics of Spathiphyllum floribundum 'Tian Jiao' (a shade-loving species) and Chrysanthemum morifolium 'Huang Xiu Qiu' (a sun-loving species). This research revealed that green and blue light could enhance the morphological indicators, Chl a/b, photosynthetic electron transfer chain performance, and photosystem activity of S. floribundum, blue and red light could enhance the solution protein, Chl a, and photosynthetic electron transfer chain performance of C. morifolium, red and UV-A light viewed the highest SOD and CAT activities of S. floribundum (275.56 U·min·g-1; 148.33 U·min·g-1) and C. morifolium (587.03 U·min·g-1; 98.33 U·min·g-1), respectively. Blue and green light were more suitable for the growth and development of the shade-loving plant S. floribundum, while red and blue light were more suitable for the sun-loving plant C. morifolium. UV-A light could be used for their stress research. The research revealed the different adaptation mechanism of different plants to light environmental conditions.
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Affiliation(s)
- Yinglong Song
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Weichao Liu
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Zheng Wang
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Songlin He
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
- School of Horticulture Landscape Architecture, Henan Institute of Science and Technology, Xinxiang 453003, China;
| | - Wenqing Jia
- School of Horticulture Landscape Architecture, Henan Institute of Science and Technology, Xinxiang 453003, China;
| | - Yuxiao Shen
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Yuke Sun
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Yufeng Xu
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Hongwei Wang
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
| | - Wenqian Shang
- Zhengzhou Key Laboratory for Research and Development of Regional Plants, College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China; (Y.S.); (W.L.); (Z.W.); (Y.S.); (Y.S.); (Y.X.); (H.W.)
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8
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Lambertz J, Meier-Credo J, Kucher S, Bordignon E, Langer JD, Nowaczyk MM. Isolation of a novel heterodimeric PSII complex via strep-tagged PsbO. BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2023; 1864:148953. [PMID: 36572329 DOI: 10.1016/j.bbabio.2022.148953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 11/28/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
The multi-subunit membrane protein complex photosystem II (PSII) catalyzes the light-driven oxidation of water and with this the initial step of photosynthetic electron transport in plants, algae, and cyanobacteria. Its biogenesis is coordinated by a network of auxiliary proteins that facilitate the stepwise assembly of individual subunits and cofactors, forming various intermediate complexes until fully functional mature PSII is present at the end of the process. In the current study, we purified PSII complexes from a mutant line of the thermophilic cyanobacterium Thermosynechococcus vestitus BP-1 in which the extrinsic subunit PsbO, characteristic for active PSII, was fused with an N-terminal Twin-Strep-tag. Three distinct PSII complexes were separated by ion-exchange chromatography after the initial affinity purification. Two complexes differ in their oligomeric state (monomeric and dimeric) but share the typical subunit composition of mature PSII. They are characterized by the very high oxygen evolving activity of approx. 6000 μmol O2·(mg Chl·h)-1. Analysis of the third (heterodimeric) PSII complex revealed lower oxygen evolving activity of approx. 3000 μmol O2·(mg Chl·h)-1 and a manganese content of 2.7 (±0.2) per reaction center compared to 3.7 (±0.2) of fully active PSII. Mass spectrometry and time-resolved fluorescence spectroscopy further indicated that PsbO is partially replaced by Psb27 in this PSII fraction, thus implying a role of this complex in PSII repair.
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Affiliation(s)
- Jan Lambertz
- Plant Biochemistry, Faculty of Biology and Biotechnology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Jakob Meier-Credo
- Proteomics, Max Planck Institute of Biophysics, Max-von-Laue-Str. 3, 60438 Frankfurt am Main, Germany
| | - Svetlana Kucher
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Enrica Bordignon
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany; Department of Physical Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva, Switzerland(1)
| | - Julian D Langer
- Proteomics, Max Planck Institute of Biophysics, Max-von-Laue-Str. 3, 60438 Frankfurt am Main, Germany; Proteomics, Max Planck Institute for Brain Research, Max-von-Laue-Str. 4, 60438 Frankfurt am Main, Germany
| | - Marc M Nowaczyk
- Plant Biochemistry, Faculty of Biology and Biotechnology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany; Department of Biochemistry, University of Rostock, Albert-Einstein-Str. 3, 18059 Rostock, Germany(1).
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9
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Zhong Z, Wu Y, Zhang P, Hu G, Fu D, Yu G, Tong H. Transcriptomic Analysis Reveals Panicle Heterosis in an Elite Hybrid Rice ZZY10 and Its Parental Lines. PLANTS (BASEL, SWITZERLAND) 2023; 12:1309. [PMID: 36987003 PMCID: PMC10059593 DOI: 10.3390/plants12061309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 03/10/2023] [Accepted: 03/12/2023] [Indexed: 06/19/2023]
Abstract
Heterosis is the phenomenon in which some hybrid traits are superior to those of their parents. Most studies have analyzed the heterosis of agronomic traits of crops; however, heterosis of the panicles can improve yield and is important for crop breeding. Therefore, a systematic study of panicle heterosis is needed, especially during the reproductive stage. RNA sequencing (RNA Seq) and transcriptome analysis are suitable for further study of heterosis. Using the Illumina Nova Seq platform, the transcriptome of ZhongZheYou 10 (ZZY10), an elite rice hybrid, the maintainer line ZhongZhe B (ZZB), and the restorer line Z7-10 were analyzed at the heading date in Hangzhou, 2022. 581 million high-quality short reads were obtained by sequencing and were aligned against the Nipponbare reference genome. A total of 9000 differential expression genes were found between the hybrids and their parents (DGHP). Of the DGHP, 60.71% were up-regulated and 39.29% were down-regulated in the hybrid. Comparative transcriptome analysis revealed that 5235 and 3765 DGHP were between ZZY10 and ZhongZhe B and between ZZY10 and Z7-10, respectively. This result is consistent with the transcriptome profile of ZZY10 and was similar to Z7-10. The expression patterns of DGHP mainly exhibited over-dominance, under-dominance, and additivity. Among the DGHP-involved GO terms, pathways such as photosynthesis, DNA integration, cell wall modification, thylakoid, and photosystem were significant. 21 DGHP, which were involved in photosynthesis, and 17 random DGHP were selected for qRT-PCR validation. The up-regulated PsbQ and down-regulated subunits of PSI and PSII and photosynthetic electron transport in the photosynthesis pathway were observed in our study. Extensive transcriptome data were obtained by RNA-Seq, providing a comprehensive overview of panicle transcriptomes at the heading stage in a heterotic hybrid.
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Affiliation(s)
- Zhengzheng Zhong
- State Key Laboratory of Rice Biology and Breeding, China National Rice Research Institute, Hangzhou 311400, China
| | - Yawen Wu
- State Key Laboratory of Rice Biology and Breeding, China National Rice Research Institute, Hangzhou 311400, China
| | - Peng Zhang
- State Key Laboratory of Rice Biology and Breeding, China National Rice Research Institute, Hangzhou 311400, China
| | - Guocheng Hu
- State Key Laboratory of Rice Biology and Breeding, China National Rice Research Institute, Hangzhou 311400, China
| | - Dong Fu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Guoping Yu
- National Nanfan Research Institute, Chinese Academy of Agricultural Sciences, Sanya 572025, China
| | - Hanhua Tong
- State Key Laboratory of Rice Biology and Breeding, China National Rice Research Institute, Hangzhou 311400, China
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10
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Jiang X, Zhou W, Wang H, You J, Liu W, Zhang M. TMT-Based Proteomic Analysis of Continuous Cropping Response in Codonopsis tangshen Oliv. Life (Basel) 2023; 13:life13030765. [PMID: 36983920 PMCID: PMC10052164 DOI: 10.3390/life13030765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 03/16/2023] Open
Abstract
The growth and development of Codonopsis tangshen, an important herb used in Chinese traditional medicine, have been seriously affected by continuous cropping obstacles. Therefore, understanding the molecular responses of C. tangshen to continuous cropping is imperative to improve its resistance to continuous cropping obstacles. Here, physiological and biochemical results showed that the levels of chlorophyll and malonaldehyde (MDA) were higher in the continuous cropping (LZ) group compared with those of the non-continuous cropping (FLZ) group, while superoxide dismutase (SOD) content was lower in the LZ group than in the FLZ group. Tandem mass tag (TMT)-based proteomic analysis was performed to investigate the response mechanism to continuous cropping obstacles in C. tangshen. A total of 70 differentially expressed proteins (DEPs) were significantly involved in relevant pathways, including photosynthesis, oxidative phosphorylation, ribosome activity, and secondary metabolites. The results suggest that these DEPs in C. tangshen might play a critical role in response to continuous cropping. These findings could provide scientific basis for improving C. tangshen’s resistance to continuous cropping obstacles.
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Affiliation(s)
- Xiaogang Jiang
- Key Laboratory of Biology and Cultivation of Herb Medicine, Ministry of Agriculture and Rural Affairs, Institute of Chinese Herbal Medicines, Hubei Academy of Agricultural Sciences, Enshi 445000, China
| | - Wuxian Zhou
- Key Laboratory of Biology and Cultivation of Herb Medicine, Ministry of Agriculture and Rural Affairs, Institute of Chinese Herbal Medicines, Hubei Academy of Agricultural Sciences, Enshi 445000, China
| | - Hua Wang
- Key Laboratory of Biology and Cultivation of Herb Medicine, Ministry of Agriculture and Rural Affairs, Institute of Chinese Herbal Medicines, Hubei Academy of Agricultural Sciences, Enshi 445000, China
| | - Jinwen You
- Key Laboratory of Biology and Cultivation of Herb Medicine, Ministry of Agriculture and Rural Affairs, Institute of Chinese Herbal Medicines, Hubei Academy of Agricultural Sciences, Enshi 445000, China
| | - Wenlu Liu
- Agricultural and Rural Bureau of Enshi Tujia and Miao Autonomous Prefecture, Enshi 445000, China
| | - Meide Zhang
- Key Laboratory of Biology and Cultivation of Herb Medicine, Ministry of Agriculture and Rural Affairs, Institute of Chinese Herbal Medicines, Hubei Academy of Agricultural Sciences, Enshi 445000, China
- Correspondence: ; Tel.: +86-139-9776-7016
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11
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cKMT1 is a new lysine methyltransferase that methylates the ferredoxin-NADP(+) oxidoreductase (FNR) and regulates energy transfer in cyanobacteria. Mol Cell Proteomics 2023; 22:100521. [PMID: 36858286 PMCID: PMC10090440 DOI: 10.1016/j.mcpro.2023.100521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 02/20/2023] [Accepted: 02/24/2023] [Indexed: 03/03/2023] Open
Abstract
Lysine methylation is a conserved and dynamic regulatory post-translational modification performed by lysine methyltransferases (KMTs). KMTs catalyze the transfer of mono-, di-, or tri-methyl groups to substrate proteins and play a critical regulatory role in all domains of life. To date, only one KMT has been identified in cyanobacteria. Here, we tested all of the predicted KMTs in the cyanobacterium Synechocystis sp. PCC 6803 (Synechocystis), and we biochemically characterized sll1526 that we termed cKMT1 (cyanobacterial lysine methyltransferase 1), and determined that it can catalyze lysine methylation both in vivo and in vitro. Loss of cKMT1 alters photosynthetic electron transfer in Synechocystis. We analyzed cKMT1-regulated methylation sites in Synechocystis using a timsTOF Pro instrument. We identified 305 class I lysine methylation sites within 232 proteins, and of these, 80 methylation sites in 58 proteins were hypomethylated in ΔcKMT1 cells. We further demonstrated that cKMT1 could methylate ferredoxin-NADP(+) oxidoreductase (FNR) and its potential sites of action on FNR were identified. Amino acid residues H118 and Y219 were identified as key residues in the putative active site of cKMT1 as indicated by structure simulation, site-directed mutagenesis, and KMT activity measurement. Using mutations that mimic the unmethylated forms of FNR, we demonstrated that the inability to methylate K139 residues results in a decrease in the redox activity of FNR and affects energy transfer in Synechocystis. Together, our study identified a new KMT in Synechocystis and elucidated a methylation-mediated molecular mechanism catalyzed by cKMT1 for the regulation of energy transfer in cyanobacteria.
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12
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Mao R, Zhang H, Bie L, Liu LN, Gao J. Million-atom molecular dynamics simulations reveal the interfacial interactions and assembly of plant PSII-LHCII supercomplex. RSC Adv 2023; 13:6699-6712. [PMID: 36860540 PMCID: PMC9969236 DOI: 10.1039/d2ra08240c] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 02/07/2023] [Indexed: 03/02/2023] Open
Abstract
Protein-protein interface interactions dictate efficient excitation energy transfer from light-harvesting antennas to the photosystem II (PSII) core. In this work, we construct a 1.2 million atom-scale model of plant C2S2-type PSII-LHCII supercomplex and perform microsecond-scale molecular dynamics (MD) simulations to explore the interactions and assembly mechanisms of the sizeable PSII-LHCII supercomplex. We optimize the nonbonding interactions of the PSII-LHCII cryo-EM structure using microsecond-scale MD simulations. Binding free energy calculations with component decompositions reveal that hydrophobic interactions predominantly drive antenna-core association and the antenna-antenna interactions are relatively weak. Despite the positive electrostatic interaction energies, hydrogen bonds and salt bridges mainly provide directional or anchoring forces for interface binding. Analysis of the roles of small intrinsic subunits of PSII suggests that LHCII and CP26 first interact with small intrinsic subunits and then bind to the core proteins, whereas CP29 adopts a one-step binding process to the PSII core without the assistance of other factors. Our study provides insights into the molecular underpinnings of the self-organization and regulation of plant PSII-LHCII. It lays the framework for deciphering the general assembly principles of photosynthetic supercomplexes and possibly other macromolecular structures. The finding also has implications for repurposing photosynthetic systems to enhance photosynthesis.
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Affiliation(s)
- Ruichao Mao
- Hubei Key Laboratory of Agricultural Bioinformatics, College of Informatics, Huazhong Agricultural University Wuhan 430070 Hubei China
| | - Han Zhang
- Hubei Key Laboratory of Agricultural Bioinformatics, College of Informatics, Huazhong Agricultural University Wuhan 430070 Hubei China
| | - Lihua Bie
- Hubei Key Laboratory of Agricultural Bioinformatics, College of Informatics, Huazhong Agricultural University Wuhan 430070 Hubei China
| | - Lu-Ning Liu
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool Liverpool L69 7ZB UK .,Frontiers Science Center for Deep Ocean Multispheres and Earth System, College of Marine Life Sciences, Ocean University of China Qingdao 266003 China
| | - Jun Gao
- Hubei Key Laboratory of Agricultural Bioinformatics, College of Informatics, Huazhong Agricultural University Wuhan 430070 Hubei China
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13
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Li W, Guo J, Han X, Da X, Wang K, Zhao H, Huang ST, Li B, He H, Jiang R, Zhou S, Yan P, Chen T, He Y, Xu J, Liu Y, Wu Y, Shou H, Wu Z, Mao C, Mo X. A novel protein domain is important for photosystem II complex assembly and photoautotrophic growth in angiosperms. MOLECULAR PLANT 2023; 16:374-392. [PMID: 36566350 DOI: 10.1016/j.molp.2022.12.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 11/24/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Photosystem II (PSII) is a multi-subunit protein complex of the photosynthetic electron transport chain that is vital to photosynthesis. Although the structure, composition, and function of PSII have been extensively studied, its biogenesis mechanism remains less understood. Thylakoid rhodanese-like (TROL) provides an anchor for leaf-type ferredoxin:NADP+ oxidoreductase. Here, we report the chacterizaton of a second type of TROL protein, TROL2, encoded by seed plant genomes whose function has not previously been reported. We show that TROL2 is a PSII assembly cofactor with essential roles in the establishment of photoautotrophy. TROL2 contains a 45-amino-acid domain, termed the chlorotic lethal seedling (CLS) domain, that is both necessary and sufficient for TROL2 function in PSII assembly and photoautotrophic growth. Phylogenetic analyses suggest that TROL2 may have arisen from ancestral TROL1 via gene duplication before the emergence of seed plants and acquired the CLS domain via evolution of the sequence encoding its N-terminal portion. We further reveal that TROL2 (or CLS) forms an assembly cofactor complex with the intrinsic thylakoid membrane protein LOW PSII ACCUMULATION2 and interacts with small PSII subunits to facilitate PSII complex assembly. Collectively, our study not only shows that TROL2 (CLS) is essential for photoautotrophy in angiosperms but also reveals its mechanistic role in PSII complex assembly, shedding light on the molecular and evolutionary mechanisms of photosynthetic complex assemblyin angiosperms.
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Affiliation(s)
- Wei Li
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Jiangfan Guo
- College of Life Science, Shaanxi Normal University, Xi'an, Shaanxi Province 710062, PR China
| | - Xue Han
- School of Advanced Agricultural Sciences and School of Life Sciences, State Key Laboratory of Protein and Plant Gene Research, Peking University, Beijing 100871, China; Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences at Weifang, Weifang, Shandong 261000, China
| | - Xiaowen Da
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Kai Wang
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Hongfei Zhao
- College of Urban Construction, Zhejiang Shuren University, Hangzhou 310015, PR China
| | - Shi-Tang Huang
- School of Life Sciences, Peking University, Beijing 100871, PR China
| | - Bosheng Li
- Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences at Weifang, Weifang, Shandong 261000, China
| | - Hang He
- School of Advanced Agricultural Sciences and School of Life Sciences, State Key Laboratory of Protein and Plant Gene Research, Peking University, Beijing 100871, China; Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences at Weifang, Weifang, Shandong 261000, China
| | - Ruirui Jiang
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Shichen Zhou
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Peng Yan
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Tao Chen
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Yi He
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou 311300, PR China
| | - Jiming Xu
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Yu Liu
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Yunrong Wu
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Huixia Shou
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Zhongchang Wu
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Chuanzao Mao
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China
| | - Xiaorong Mo
- State Key Laboratory of Plant Environmental Resilience, College of Life Science, Zhejiang University, Hangzhou 310058, PR China.
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14
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Chen LX, Mao HT, Lin S, Din AMU, Yin XY, Yuan M, Zhang ZW, Yuan S, Zhang HY, Chen YE. Different Photosynthetic Response to High Light in Four Triticeae Crops. Int J Mol Sci 2023; 24:ijms24021569. [PMID: 36675085 PMCID: PMC9862584 DOI: 10.3390/ijms24021569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/09/2022] [Accepted: 12/21/2022] [Indexed: 01/14/2023] Open
Abstract
Photosynthetic capacity is usually affected by light intensity in the field. In this study, photosynthetic characteristics of four different Triticeae crops (wheat, triticale, barley, and highland barley) were investigated based on chlorophyll fluorescence and the level of photosynthetic proteins under high light. Compared with wheat, three cereals (triticale, barley, and highland barley) presented higher photochemical efficiency and heat dissipation under normal light and high light for 3 h, especially highland barley. In contrast, lower photoinhibition was observed in barley and highland barley relative to wheat and triticale. In addition, barley and highland barley showed a lower decline in D1 and higher increase in Lhcb6 than wheat and triticale under high light. Furthermore, compared with the control, the results obtained from PSII protein phosphorylation showed that the phosphorylation level of PSII reaction center proteins (D1 and D2) was higher in barley and highland barley than that of wheat and triticale. Therefore, we speculated that highland barley can effectively alleviate photodamages to photosynthetic apparatus by high photoprotective dissipation, strong phosphorylation of PSII reaction center proteins, and rapid PSII repair cycle under high light.
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Affiliation(s)
- Lun-Xing Chen
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Hao-Tian Mao
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Shuai Lin
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Atta Mohi Ud Din
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Xiao-Yan Yin
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Ming Yuan
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Zhong-Wei Zhang
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Shu Yuan
- College of Resources, Sichuan Agricultural University, Chengdu 611130, China
| | - Huai-Yu Zhang
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
| | - Yang-Er Chen
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China
- College of Life Science, Sichuan Agricultural University, Ya’an 625014, China
- Correspondence: ; Tel.: +86-835-2886653
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15
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From antenna to reaction center: Pathways of ultrafast energy and charge transfer in photosystem II. Proc Natl Acad Sci U S A 2022; 119:e2208033119. [PMID: 36215463 PMCID: PMC9586314 DOI: 10.1073/pnas.2208033119] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The photosystem II core complex (PSII-CC) is a photosynthetic complex that contains antenna proteins, which collect energy from sunlight, and a reaction center, which converts the collected energy to redox potential. Understanding the interplay between the antenna proteins and the reaction center will facilitate the development of more efficient solar energy conversion technologies. Here, we study the sub-100-ps dynamics of PSII-CC with two-dimensional electronic-vibrational spectroscopy, which connects energy flows with physical space, allowing a direct mapping of energy transfer pathways. Our results reveal a complex dynamical scheme which includes a specific pathway that connects CP43 to the reaction center. Resolving this pathway experimentally provides insights into the energy conversion processes in natural photosynthesis. The photosystem II core complex (PSII-CC) is the smallest subunit of the oxygenic photosynthetic apparatus that contains core antennas and a reaction center, which together allow for rapid energy transfer and charge separation, ultimately leading to efficient solar energy conversion. However, there is a lack of consensus on the interplay between the energy transfer and charge separation dynamics of the core complex. Here, we report the application of two-dimensional electronic-vibrational (2DEV) spectroscopy to the spinach PSII-CC at 77 K. The simultaneous temporal and spectral resolution afforded by 2DEV spectroscopy facilitates the separation and direct assignment of coexisting dynamical processes. Our results show that the dominant dynamics of the PSII-CC are distinct in different excitation energy regions. By separating the excitation regions, we are able to distinguish the intraprotein dynamics and interprotein energy transfer. Additionally, with the improved resolution, we are able to identify the key pigments involved in the pathways, allowing for a direct connection between dynamical and structural information. Specifically, we show that C505 in CP43 and the peripheral chlorophyll ChlzD1 in the reaction center are most likely responsible for energy transfer from CP43 to the reaction center.
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16
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Hirschi S, Ward TR, Meier WP, Müller DJ, Fotiadis D. Synthetic Biology: Bottom-Up Assembly of Molecular Systems. Chem Rev 2022; 122:16294-16328. [PMID: 36179355 DOI: 10.1021/acs.chemrev.2c00339] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The bottom-up assembly of biological and chemical components opens exciting opportunities to engineer artificial vesicular systems for applications with previously unmet requirements. The modular combination of scaffolds and functional building blocks enables the engineering of complex systems with biomimetic or new-to-nature functionalities. Inspired by the compartmentalized organization of cells and organelles, lipid or polymer vesicles are widely used as model membrane systems to investigate the translocation of solutes and the transduction of signals by membrane proteins. The bottom-up assembly and functionalization of such artificial compartments enables full control over their composition and can thus provide specifically optimized environments for synthetic biological processes. This review aims to inspire future endeavors by providing a diverse toolbox of molecular modules, engineering methodologies, and different approaches to assemble artificial vesicular systems. Important technical and practical aspects are addressed and selected applications are presented, highlighting particular achievements and limitations of the bottom-up approach. Complementing the cutting-edge technological achievements, fundamental aspects are also discussed to cater to the inherently diverse background of the target audience, which results from the interdisciplinary nature of synthetic biology. The engineering of proteins as functional modules and the use of lipids and block copolymers as scaffold modules for the assembly of functionalized vesicular systems are explored in detail. Particular emphasis is placed on ensuring the controlled assembly of these components into increasingly complex vesicular systems. Finally, all descriptions are presented in the greater context of engineering valuable synthetic biological systems for applications in biocatalysis, biosensing, bioremediation, or targeted drug delivery.
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Affiliation(s)
- Stephan Hirschi
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bühlstrasse 28, 3012 Bern, Switzerland.,Molecular Systems Engineering, National Centre of Competence in Research (NCCR), 4002 Basel, Switzerland
| | - Thomas R Ward
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.,Molecular Systems Engineering, National Centre of Competence in Research (NCCR), 4002 Basel, Switzerland
| | - Wolfgang P Meier
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.,Molecular Systems Engineering, National Centre of Competence in Research (NCCR), 4002 Basel, Switzerland
| | - Daniel J Müller
- Department of Biosystems Science and Engineering, ETH Zürich, Mattenstrasse 26, 4058 Basel, Switzerland.,Molecular Systems Engineering, National Centre of Competence in Research (NCCR), 4002 Basel, Switzerland
| | - Dimitrios Fotiadis
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bühlstrasse 28, 3012 Bern, Switzerland.,Molecular Systems Engineering, National Centre of Competence in Research (NCCR), 4002 Basel, Switzerland
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17
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Giardi MT, Antonacci A, Touloupakis E, Mattoo AK. Investigation of Photosystem II Functional Size in Higher Plants under Physiological and Stress Conditions Using Radiation Target Analysis and Sucrose Gradient Ultracentrifugation. Molecules 2022; 27:5708. [PMID: 36080475 PMCID: PMC9457868 DOI: 10.3390/molecules27175708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/31/2022] [Accepted: 09/01/2022] [Indexed: 12/02/2022] Open
Abstract
The photosystem II (PSII) reaction centre is the critical supramolecular pigment-protein complex in the chloroplast which catalyses the light-induced transfer of electrons from water to plastoquinone. Structural studies have demonstrated the existence of an oligomeric PSII. We carried out radiation inactivation target analysis (RTA), together with sucrose gradient ultracentrifugation (SGU) of PSII, to study the functional size of PSII in diverse plant species under physiological and stress conditions. Two PSII populations, made of dimeric and monomeric core particles, were revealed in Pisum sativum, Spinacea oleracea, Phaseulus vulgaris, Medicago sativa, Zea mais and Triticum durum. However, this core pattern was not ubiquitous in the higher plants since we found one monomeric core population in Vicia faba and a dimeric core in the Triticum durum yellow-green strain, respectively. The PSII functional sizes measured in the plant seedlings in vivo, as a decay of the maximum quantum yield of PSII for primary photochemistry, were in the range of 75-101 ± 18 kDa, 2 to 3 times lower than those determined in vitro. Two abiotic stresses, heat and drought, imposed individually on Pisum sativum, increased the content of the dimeric core in SGU and the minimum functional size determined by RTA in vivo. These data suggest that PSII can also function as a monomer in vivo, while under heat and drought stress conditions, the dimeric PSII structure is predominant.
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Affiliation(s)
- Maria Teresa Giardi
- Institute of Crystallography, CNR, Via Salaria Km 29.3, 00016 Monterotondo, Italy
- Biosensor Srl, Via Olmetti 44, 00060 Formello, Italy
| | - Amina Antonacci
- Institute of Crystallography, CNR, Via Salaria Km 29.3, 00016 Monterotondo, Italy
| | - Eleftherios Touloupakis
- Research Institute on Terrestrial Ecosystems, CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Autar K. Mattoo
- USDA-ARS, Sustainable Agricultural Systems Laboratory, Beltsville, MD 20705, USA
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18
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Spaniol B, Lang J, Venn B, Schake L, Sommer F, Mustas M, Geimer S, Wollman FA, Choquet Y, Mühlhaus T, Schroda M. Complexome profiling on the Chlamydomonas lpa2 mutant reveals insights into PSII biogenesis and new PSII associated proteins. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:245-262. [PMID: 34436580 PMCID: PMC8730698 DOI: 10.1093/jxb/erab390] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 08/24/2021] [Indexed: 05/27/2023]
Abstract
While the composition and function of the major thylakoid membrane complexes are well understood, comparatively little is known about their biogenesis. The goal of this work was to shed more light on the role of auxiliary factors in the biogenesis of photosystem II (PSII). Here we have identified the homolog of LOW PSII ACCUMULATION 2 (LPA2) in Chlamydomonas. A Chlamydomonas reinhardtii lpa2 mutant grew slower in low light, was hypersensitive to high light, and exhibited aberrant structures in thylakoid membrane stacks. Chlorophyll fluorescence (Fv/Fm) was reduced by 38%. Synthesis and stability of newly made PSII core subunits D1, D2, CP43, and CP47 were not impaired. However, complexome profiling revealed that in the mutant CP43 was reduced to ~23% and D1, D2, and CP47 to ~30% of wild type levels. Levels of PSI and the cytochrome b6f complex were unchanged, while levels of the ATP synthase were increased by ~29%. PSII supercomplexes, dimers, and monomers were reduced to ~7%, ~26%, and ~60% of wild type levels, while RC47 was increased ~6-fold and LHCII by ~27%. We propose that LPA2 catalyses a step during PSII assembly without which PSII monomers and further assemblies become unstable and prone to degradation. The LHCI antenna was more disconnected from PSI in the lpa2 mutant, presumably as an adaptive response to reduce excitation of PSI. From the co-migration profiles of 1734 membrane-associated proteins, we identified three novel putative PSII associated proteins with potential roles in regulating PSII complex dynamics, assembly, and chlorophyll breakdown.
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Affiliation(s)
- Benjamin Spaniol
- Molekulare Biotechnologie & Systembiologie, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
| | - Julia Lang
- Molekulare Biotechnologie & Systembiologie, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
| | - Benedikt Venn
- Computational Systems Biology, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
| | - Lara Schake
- Molekulare Biotechnologie & Systembiologie, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
| | - Frederik Sommer
- Molekulare Biotechnologie & Systembiologie, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
| | - Matthieu Mustas
- Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, Institut de Biologie Physico-Chimique, UMR CNRS/UPMC 7141, Paris, France
| | - Stefan Geimer
- Zellbiologie/Elektronenmikroskopie, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Francis-André Wollman
- Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, Institut de Biologie Physico-Chimique, UMR CNRS/UPMC 7141, Paris, France
| | - Yves Choquet
- Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, Institut de Biologie Physico-Chimique, UMR CNRS/UPMC 7141, Paris, France
| | - Timo Mühlhaus
- Computational Systems Biology, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
| | - Michael Schroda
- Molekulare Biotechnologie & Systembiologie, TU Kaiserslautern, Paul-Ehrlich Straße 23, D-67663 Kaiserslautern, Germany
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19
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Color-Specific Recovery to Extreme High-Light Stress in Plants. Life (Basel) 2021; 11:life11080812. [PMID: 34440556 PMCID: PMC8398727 DOI: 10.3390/life11080812] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/06/2021] [Accepted: 08/06/2021] [Indexed: 11/17/2022] Open
Abstract
Plants pigments, such as chlorophyll and carotenoids, absorb light within specific wavelength ranges, impacting their response to environmental light changes. Although the color-specific response of plants to natural levels of light is well described, extreme high-light stress is still being discussed as a general response, without considering the impact of wavelengths in particular response processes. In this study, we explored how the plant proteome coordinated the response and recovery to extreme light conditions (21,000 µmol m-2 s-1) under different wavelengths. Changes at the protein and mRNA levels were measured, together with the photosynthetic parameters of plants under extreme high-light conditions. The changes in abundance of four proteins involved in photoinhibition, and in the biosynthesis/assembly of PSII (PsbS, PsbH, PsbR, and Psb28) in both light treatments were measured. The blue-light treatment presented a three-fold higher non-photochemical quenching and did not change the level of the oxygen-evolving complex (OEC) or the photosystem II (PSII) complex components when compared to the control, but significantly increased psbS transcripts. The red-light treatment caused a higher abundance of PSII and OEC proteins but kept the level of psbS transcripts the same as the control. Interestingly, the blue light stimulated a more efficient energy dissipation mechanism when compared to the red light. In addition, extreme high-light stress mechanisms activated by blue light involve the role of OEC through increasing PsbS transcript levels. In the proteomics spatial analysis, we report disparate activation of multiple stress pathways under three differently damaged zones as the enriched function of light stress only found in the medium-damaged zone of the red LED treatment. The results indicate that the impact of extreme high-light stress on the proteomic level is wavelength-dependent.
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20
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Zeng Y, Wang J, Yang C, Ding M, Hamilton PB, Zhang X, Yang C, Zhnag L, Dai X. A Streptomyces globisporus strain kills Microcystis aeruginosa via cell-to-cell contact. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 769:144489. [PMID: 33465632 DOI: 10.1016/j.scitotenv.2020.144489] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 12/08/2020] [Accepted: 12/09/2020] [Indexed: 06/12/2023]
Abstract
Cyanobacterial harmful algal blooms (CyanoHABs) bring economic loss, damage aquatic ecosystems, and produce cyanobacterial toxins that threaten human health. Algicidal bacteria as pathogens can expediate the decline of CyanoHABs. In this study, a Streptomyces globisporus strain (designated G9), isolated from soil near a eutrophic pond, showed high algicidal activity against Microcystis aeruginosa. Experimental results show that G9 preyed on Microcystis through cell-to-cell contact: (1) the hyphae of G9 killed cyanobacterial cells by twining around them, while cells beyond the reach of G9 hyphae were in normal shapes; (2) No algicides were detectable in the supernatant of G9 cultures or G9-Microcystis cocultures. The algicidal ratio of G9 to M. aeruginosa reached 96.7% after 6 days. G9 selectively killed the tested cyanobacterial strains, while it had only minor impacts on the growth of tested Chlorophyceae. Differential gene expression studies show that G9 affected the expression of key genes of M. aeruginosa involved in photosynthesis, microcystin synthesis and cellular emergency responses. Further, the microcystin-LR content decreased gradually with G9 treatment. As the first reported Streptomyces sp. with algicidal (predation) activity requiring cell-to-cell contact with target prey, G9 is a good candidate for the exploration of additional cyanobacteria-bacteria interactions and the development of novel strategies to control CyanoHABs.
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Affiliation(s)
- Yudie Zeng
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Jiayu Wang
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Chunyan Yang
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Mengyue Ding
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Paul B Hamilton
- Canadian Museum of Nature, 240 McLeod Street, Ottawa, Ontario K1P 6P4, Canada
| | - Xiaohui Zhang
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Caiyun Yang
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Lei Zhnag
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Xianzhu Dai
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China.
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21
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Challenges and Potential in Increasing Lutein Content in Microalgae. Microorganisms 2021; 9:microorganisms9051068. [PMID: 34063406 PMCID: PMC8156089 DOI: 10.3390/microorganisms9051068] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/09/2021] [Accepted: 05/10/2021] [Indexed: 02/08/2023] Open
Abstract
Research on enhancing lutein content in microalgae has made significant progress in recent years. However, strategies are needed to address the possible limitations of microalgae as practical lutein producers. The capacity of lutein sequestration may determine the upper limit of cellular lutein content. The preliminary estimation presented in this work suggests that the lutein sequestration capacity of the light-harvesting complex (LHC) of microalgae is most likely below 2% on the basis of dry cell weight (DCW). Due to its nature as a structural pigment, higher lutein content might interfere with the LHC in fulfilling photosynthetic functions. Storing lutein in a lipophilic environment is a mechanism for achieving high lutein content but several critical barriers must be overcome such as lutein degradation and access to lipid droplet to be stored through esterification. Understanding the mechanisms underlying lipid droplet biogenesis in chloroplasts, as well as carotenoid trafficking through chloroplast membranes and carotenoid esterification, may provide insight for new approaches to achieve high lutein contents in algae. In the meantime, building the machinery for esterification and sequestration of lutein and other hydroxyl-carotenoids in model microorganisms, such as yeast, with synthetic biology technology provides a promising option.
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22
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Tokarz KM, Wesołowski W, Tokarz B, Makowski W, Wysocka A, Jędrzejczyk RJ, Chrabaszcz K, Malek K, Kostecka-Gugała A. Stem Photosynthesis-A Key Element of Grass Pea ( Lathyrus sativus L.) Acclimatisation to Salinity. Int J Mol Sci 2021; 22:E685. [PMID: 33445673 PMCID: PMC7828162 DOI: 10.3390/ijms22020685] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/07/2021] [Accepted: 01/09/2021] [Indexed: 11/19/2022] Open
Abstract
Grass pea (Lathyrus sativus) is a leguminous plant of outstanding tolerance to abiotic stress. The aim of the presented study was to describe the mechanism of grass pea (Lathyrus sativus L.) photosynthetic apparatus acclimatisation strategies to salinity stress. The seedlings were cultivated in a hydroponic system in media containing various concentrations of NaCl (0, 50, and 100 mM), imitating none, moderate, and severe salinity, respectively, for three weeks. In order to characterise the function and structure of the photosynthetic apparatus, Chl a fluorescence, gas exchange measurements, proteome analysis, and Fourier-transform infrared spectroscopy (FT-IR) analysis were done inter alia. Significant differences in the response of the leaf and stem photosynthetic apparatus to severe salt stress were observed. Leaves became the place of harmful ion (Na+) accumulation, and the efficiency of their carboxylation decreased sharply. In turn, in stems, the reconstruction of the photosynthetic apparatus (antenna and photosystem complexes) activated alternative electron transport pathways, leading to effective ATP synthesis, which is required for the efficient translocation of Na+ to leaves. These changes enabled efficient stem carboxylation and made them the main source of assimilates. The observed changes indicate the high plasticity of grass pea photosynthetic apparatus, providing an effective mechanism of tolerance to salinity stress.
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Affiliation(s)
- Krzysztof M. Tokarz
- Department of Botany, Physiology and Plant Protection, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 29 Listopada 54, 31-425 Krakow, Poland; (B.T.); (W.M.); (A.W.)
| | - Wojciech Wesołowski
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 29 Listopada 54, 31-425 Krakow, Poland; (W.W.); (A.K.-G.)
| | - Barbara Tokarz
- Department of Botany, Physiology and Plant Protection, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 29 Listopada 54, 31-425 Krakow, Poland; (B.T.); (W.M.); (A.W.)
| | - Wojciech Makowski
- Department of Botany, Physiology and Plant Protection, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 29 Listopada 54, 31-425 Krakow, Poland; (B.T.); (W.M.); (A.W.)
| | - Anna Wysocka
- Department of Botany, Physiology and Plant Protection, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 29 Listopada 54, 31-425 Krakow, Poland; (B.T.); (W.M.); (A.W.)
- Centre Algatech, Institute of Microbiology, Czech Academy of Sciences, 379 81 Třeboň, Czech Republic
| | - Roman J. Jędrzejczyk
- Plant-Microorganism Interactions Group, Malopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7A, 30-387 Krakow, Poland;
| | - Karolina Chrabaszcz
- Raman Imaging Group, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.C.); (K.M.)
| | - Kamilla Malek
- Raman Imaging Group, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (K.C.); (K.M.)
| | - Anna Kostecka-Gugała
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 29 Listopada 54, 31-425 Krakow, Poland; (W.W.); (A.K.-G.)
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23
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Xiao Y, Zhu Q, Yang Y, Wang W, Kuang T, Shen JR, Han G. Role of PsbV-Tyr137 in photosystem II studied by site-directed mutagenesis in the thermophilic cyanobacterium Thermosynechococcus vulcanus. PHOTOSYNTHESIS RESEARCH 2020; 146:41-54. [PMID: 32342261 DOI: 10.1007/s11120-020-00753-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 04/19/2020] [Indexed: 05/07/2023]
Abstract
PsbV (cytochrome c550) is one of the three extrinsic proteins of photosystem II (PSII) and functions to maintain the stability and activity of the Mn4CaO5 cluster, the catalytic center for water oxidation. PsbV-Y137 is the C-terminal residue of PsbV and is located at the exit of a hydrogen-bond network mediated by the D1-Y161-H190 residue pair. In order to examine the function of PsbV-Y137, four mutants, PsbV-Y137A, PsbV-Y137F, PsbV-Y137G, and PsbV-Y137W, were generated with Thermosynechococcus vulcanus (T. vulcanus). These mutants showed growth rates similar to that of the wild-type strain (WT); however, their oxygen-evolving activities were different. At pH 6.5, the oxygen evolution rates of Y137F and Y137W were almost identical to that of WT, whereas the oxygen evolution rates of the Y137A, Y137G mutants were 64% and 61% of WT, respectively. However, the oxygen evolution in the latter two mutants decreased less at higher pHs, suggesting that higher pHs facilitated oxygen evolution probably by facilitating proton egress in these two mutants. Furthermore, thylakoid membranes isolated from the PsbV-Y137A, PsbV-Y137G mutants exhibited much lower levels of oxygen-evolving activity than that of WT, which was found to be caused by the release of PsbV. In addition, PSII complexes purified from the PsbV-Y137A and PsbV-Y137G mutants lost all of the three extrinsic proteins but instead bind Psb27, an assembly cofactor of PSII. These results demonstrate that the PsbV-Tyr137 residue is required for the stable binding of PsbV to PSII, and the hydrogen-bond network mediated by D1-Y161-H190 is likely to function in proton egress during water oxidation.
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Affiliation(s)
- Yanan Xiao
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China
- University of Chinese Academy of Sciences, Yuquan Rd, Shijingshan District, Beijing, 100049, China
| | - Qingjun Zhu
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China
- University of Chinese Academy of Sciences, Yuquan Rd, Shijingshan District, Beijing, 100049, China
| | - Yanyan Yang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China
| | - Wenda Wang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China
| | - Tingyun Kuang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China
| | - Jian-Ren Shen
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China.
- The Innovative Academy of Seed Design, Chinese Academy of Sciences, No. 1 Beichen West Rd., Beijing, 100101, China.
- Research Institute of Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Tsushima Naka 3-1-1, Okayama, 700-8530, Japan.
| | - Guangye Han
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, No. 20, Nanxincun, Xiangshan, Beijing, 100093, China.
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24
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Oka K, Ueno Y, Yokono M, Shen JR, Nagao R, Akimoto S. Adaptation of light-harvesting and energy-transfer processes of a diatom Phaeodactylum tricornutum to different light qualities. PHOTOSYNTHESIS RESEARCH 2020; 146:227-234. [PMID: 31965467 DOI: 10.1007/s11120-020-00714-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
Fucoxanthin-chlorophyll (Chl) a/c-binding proteins (FCPs) are light-harvesting pigment-protein complexes found in diatoms and brown algae. Due to the characteristic pigments, such as fucoxanthin and Chl c, FCPs can capture light energy in blue-to green regions. A pennate diatom Phaeodactylum tricornutum synthesizes a red-shifted form of FCP under weak or red light, extending a light-absorption ability to longer wavelengths. In the present study, we examined changes in light-harvesting and energy-transfer processes of P. tricornutum cells grown under white- and single-colored light-emitting diodes (LEDs). The red-shifted FCP appears in the cells grown under the green, yellow, and red LEDs, and exhibited a fluorescence peak around 714 nm. Additional energy-transfer pathways are established in the red-shifted FCP; two forms (F713 and F718) of low-energy Chl a work as energy traps at 77 K. Averaged fluorescence lifetimes are prolonged in the cells grown under the yellow and red LEDs, whereas they are shortened in the blue-LED-grown cells. Based on these results, we discussed the light-adaptation machinery of P. tricornutum cells involved in the red-shifted FCP.
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Affiliation(s)
- Kumiko Oka
- Faculty of Science, Kobe University, Kobe, 657-8501, Japan
| | - Yoshifumi Ueno
- Graduate School of Science, Kobe University, Kobe, 657-8501, Japan
| | - Makio Yokono
- Innovation Center, Nippon Flour Mills Co., Ltd, Atsugi, 243-0041, Japan
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan
| | - Ryo Nagao
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan.
| | - Seiji Akimoto
- Faculty of Science, Kobe University, Kobe, 657-8501, Japan.
- Graduate School of Science, Kobe University, Kobe, 657-8501, Japan.
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25
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Li L, Yi H. Photosynthetic responses of Arabidopsis to SO 2 were related to photosynthetic pigments, photosynthesis gene expression and redox regulation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 203:111019. [PMID: 32888606 DOI: 10.1016/j.ecoenv.2020.111019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 07/01/2020] [Accepted: 07/07/2020] [Indexed: 06/11/2023]
Abstract
Sulfur dioxide (SO2) is one of the most common and harmful air pollutants. High concentrations of SO2 can induce a series of defensive responses in Arabidopsis plants. However, the role of photosynthesis in the plant response to SO2 stress is not clear. Here, we report the photosynthetic responses of Arabidopsis plants to SO2 stress. Exposure to 30 mg/m3 SO2 decreased stomatal conductance (Gs) and transpiration rate (Tr) but increased photosynthetic pigments and net photosynthetic rate (Pn). The contents of carbohydrates and sucrose were not altered. The transcript levels of most genes related to photosystem II (PSII), cytochrome b6/f (Cytb6f), photosystem I (PSI) and carbon fixation were upregulated, revealing one important regulatory circuit for the maintenance of chloroplast homeostasis under SO2 stress. Exposure to SO2 triggered reactive oxygen species (ROS) generation, accompanied by increases in superoxide dismutase (SOD) activity and the contents of cysteine (Cys), glutathione (GSH) and non-protein thiol (NPT), which maintained cellular redox homeostasis. Together, our results indicated that chloroplast photosynthesis was involved in the plant response to SO2 stress. The photosynthetic responses were related to photosynthetic pigments, photosynthesis gene expression and redox regulation.
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Affiliation(s)
- Lijuan Li
- School of Life Science, Shanxi University, Taiyuan, 030006, Shanxi Province, China
| | - Huilan Yi
- School of Life Science, Shanxi University, Taiyuan, 030006, Shanxi Province, China.
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26
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Zhao Y, Wei X, Long Y, Ji X. Transcriptional analysis reveals sodium nitroprusside affects alfalfa in response to PEG-induced osmotic stress at germination stage. PROTOPLASMA 2020; 257:1345-1358. [PMID: 32556557 DOI: 10.1007/s00709-020-01508-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
Drought is one of the most common environmental factors that affect alfalfa germination and development. Nitric oxide (NO) could mediate stress tolerance in plants. The goal of this study was to determine exogenous NO donor-mediated drought adaption molecular mechanisms during the alfalfa germination stage. In this study, physiological and transcriptome analyses were performed on 7 days of the growth period seedlings by sodium nitroprusside (SNP) and polyethylene glycol (PEG) treatment. The results showed that SNP supplementation alleviated malondialdehyde accumulation, increased levels of proline and soluble sugars, and enhanced antioxidant enzyme activity under osmotic stress conditions. RNA-Seq experiments identified 5828 genes exhibiting differential expression in seedlings treated with PEG, SNP, or SNP+PEG relative to seedlings treated with distilled water. Of these DEGs, 3235 were upregulated, and 2593 were downregulated relative to the controls. Fifteen DEGs were amplified by qRT-PCR to verify the changes in expression determined by RNA-Seq, revealing that PIF3, glnA, PLCG1, and RP-S11e exhibited enhanced expression under the SNP+PEG treatment. SNP was found to modulate redox homeostasis-related genes such as GSTs, SOD2, GPX, and RBOH, and triggered calcium signaling transduction. It also induced some key genes relating to the abscisic acid, ethylene, and auxin signaling transduction in response to PEG stress. Conversely, genes associated with secondary metabolite biosynthesis and the metabolism of starch and sucrose during osmotic stress were downregulated by SNP. These results provide new insights into SNP-mediated drought adaption mechanisms at transcriptome-wide in alfalfa and reveal key drought tolerance pathways in this species.
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Affiliation(s)
- Ying Zhao
- College of Life Science and Technology, Gansu Agricultural University, No. 1 Yingmen Village, Anning District, Lanzhou, 730070, Gansu Province, People's Republic of China
| | - Xiaohong Wei
- College of Life Science and Technology, Gansu Agricultural University, No. 1 Yingmen Village, Anning District, Lanzhou, 730070, Gansu Province, People's Republic of China.
| | - Yu Long
- College of Business Administration, Kent State University, Kent, OH, USA
| | - Xiangzhuo Ji
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
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27
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Li L, Li F, Wang Y, Yang C, Lu C, Liu C, Sun R. An innovative artificial photosystem II constructed from PSII core of Thermosynechococcus vulcanus and LHCII of Pisum sativum - A new approach for studying the function of photosynthetic antenna. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 154:160-170. [PMID: 32563040 DOI: 10.1016/j.plaphy.2020.05.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 05/23/2020] [Accepted: 05/25/2020] [Indexed: 06/11/2023]
Abstract
In photosynthesis, the antenna system captures solar energy and transfers the excitations to photosystem II (PSII) core complex where charge separation, water splitting and oxygen evolution occur. In the evolution of photosynthesis from aquatic to terrestrial environments, the structure of PSII core complex was highly conserved while a variety of antenna forms became differentiated. In order to study the principles for energy transport from antenna to the PSII reaction center, we have explored whether the major light harvesting complex of PSII (LHCII) of higher plants can transfer energy to the cyanobacteria PSII core complexes (CC). For this purpose, LHCII from pea and CC from Thermosynechococcus vulcanus were isolated and co-reconstituted into liposome at LHCII:CC molar ratios of 2:1, 4:1 and 6:1, respectively. Chemical-cross linking followed by LC-MS/MS analysis confirmed the biochemical interaction between LHCII and CC in the liposome membrane. The analyses of 77 K fluorescence emission spectra and antenna cross section of PSII indicated that LHCII can transfer energy directly to the cyanobacterial CC. The study has laid the basis for further research on the mechanism of energy transfer from LHCII to PSII CC. This result may also open a new possibility for design and development of new artificial PSII in the application of solar energy conversion.
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Affiliation(s)
- Ling Li
- Key Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing, 100049, China
| | - Fei Li
- Key Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing, 100049, China
| | - Yue Wang
- Key Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing, 100049, China
| | - Chunhong Yang
- Key Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing, 100049, China; Qingdao Institute, Shanghai Institute of Technological Physics, Chinese Academy of Sciences, Binhai Road 50, Qingdao, 264000, China.
| | - Congming Lu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Cheng Liu
- Key Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing, 100049, China.
| | - Ruixue Sun
- Qingdao Institute, Shanghai Institute of Technological Physics, Chinese Academy of Sciences, Binhai Road 50, Qingdao, 264000, China.
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28
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Ishikawa N, Yokoe Y, Nishimura T, Nakano T, Ifuku K. PsbQ-Like Protein 3 Functions as an Assembly Factor for the Chloroplast NADH Dehydrogenase-Like Complex in Arabidopsis. PLANT & CELL PHYSIOLOGY 2020; 61:1252-1261. [PMID: 32333781 DOI: 10.1093/pcp/pcaa050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 04/17/2020] [Indexed: 06/11/2023]
Abstract
Angiosperms have three PsbQ-like (PQL) proteins in addition to the PsbQ subunit of the oxygen-evolving complex of photosystem II. Previous studies have shown that two PQL proteins, PnsL2 and PnsL3, are subunits of the chloroplast NADH dehydrogenase-like (NDH) complex involved in the photosystem I (PSI) cyclic electron flow. In addition, another PsbQ homolog, PQL3, is required for the NDH activity; however, the molecular function of PQL3 has not been elucidated. Here, we show that PQL3 is an assembly factor, particularly for the accumulation of subcomplex B (SubB) of the chloroplast NDH. In the pql3 mutant of Arabidopsis thaliana, the amounts of NDH subunits in SubB, PnsB1 and PsnB4, were decreased, causing a severe reduction in the NDH-PSI supercomplex. Analysis using blue native polyacrylamide gel electrophoresis suggested that the incorporation of PnsL3 into SubB was affected in the pql3 mutant. Unlike other PsbQ homologs, PQL3 was weakly associated with thylakoid membranes and was only partially protected from thermolysin digestion. Consistent with the function as an assembly factor, PQL3 accumulated independently in other NDH mutants, such as pnsl1-3. Furthermore, PQL3 accumulated in young leaves in a manner similar to the accumulation of CRR3, an assembly factor for SubB. These results suggest that PQL3 has developed a distinct function as an assembly factor for the NDH complex during evolution of the PsbQ protein family in angiosperms.
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Affiliation(s)
- Noriko Ishikawa
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Yuki Yokoe
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Taishi Nishimura
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takeshi Nakano
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kentaro Ifuku
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Che Y, Kusama S, Matsui S, Suorsa M, Nakano T, Aro EM, Ifuku K. Arabidopsis PsbP-Like Protein 1 Facilitates the Assembly of the Photosystem II Supercomplexes and Optimizes Plant Fitness under Fluctuating Light. PLANT & CELL PHYSIOLOGY 2020; 61:1168-1180. [PMID: 32277833 DOI: 10.1093/pcp/pcaa045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 04/11/2020] [Indexed: 06/11/2023]
Abstract
In green plants, photosystem II (PSII) forms multisubunit supercomplexes (SCs) containing a dimeric core and light-harvesting complexes (LHCs). In this study, we show that Arabidopsis thaliana PsbP-like protein 1 (PPL1) is involved in the assembly of the PSII SCs and is required for adaptation to changing light intensity. PPL1 is a homolog of PsbP protein that optimizes the water-oxidizing reaction of PSII in green plants and is required for the efficient repair of photodamaged PSII; however, its exact function has been unknown. PPL1 was enriched in stroma lamellae and grana margins and associated with PSII subcomplexes including PSII monomers and PSII dimers, and several LHCII assemblies, while PPL1 was not detected in PSII-LHCII SCs. In a PPL1 null mutant (ppl1-2), assembly of CP43, PsbR and PsbW was affected, resulting in a reduced accumulation of PSII SCs even under moderate light intensity. This caused the abnormal association of LHCII in ppl1-2, as indicated by lower maximal quantum efficiency of PSII (Fv/Fm) and accelerated State 1 to State 2 transitions. These differences would lower the capability of plants to adapt to changing light environments, thereby leading to reduced growth under natural fluctuating light environments. Phylogenetic and structural analyses suggest that PPL1 is closely related to its cyanobacterial homolog CyanoP, which functions as an assembly factor in the early stage of PSII biogenesis. Our results suggest that PPL1 has a similar function, but the data also indicate that it could aid the association of LHCII with PSII.
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Affiliation(s)
- Yufen Che
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shoko Kusama
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shintaro Matsui
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Marjaana Suorsa
- Molecular Plant Biology, Department of Biochemistry, University of Turku, FI-20014 Turku, Finland
| | - Takeshi Nakano
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Eva-Mari Aro
- Molecular Plant Biology, Department of Biochemistry, University of Turku, FI-20014 Turku, Finland
| | - Kentaro Ifuku
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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How paired PSII-LHCII supercomplexes mediate the stacking of plant thylakoid membranes unveiled by structural mass-spectrometry. Nat Commun 2020; 11:1361. [PMID: 32170184 PMCID: PMC7069969 DOI: 10.1038/s41467-020-15184-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 02/18/2020] [Indexed: 01/17/2023] Open
Abstract
Grana are a characteristic feature of higher plants’ thylakoid membranes, consisting of stacks of appressed membranes enriched in Photosystem II (PSII) and associated light-harvesting complex II (LHCII) proteins, together forming the PSII-LHCII supercomplex. Grana stacks undergo light-dependent structural changes, mainly by reorganizing the supramolecular structure of PSII-LHCII supercomplexes. LHCII is vital for grana formation, in which also PSII-LHCII supercomplexes are involved. By combining top-down and crosslinking mass spectrometry we uncover the spatial organization of paired PSII-LHCII supercomplexes within thylakoid membranes. The resulting model highlights a basic molecular mechanism whereby plants maintain grana stacking at changing light conditions. This mechanism relies on interactions between stroma-exposed N-terminal loops of LHCII trimers and Lhcb4 subunits facing each other in adjacent membranes. The combination of light-dependent LHCII N-terminal trimming and extensive N-terminal α-acetylation likely affects interactions between pairs of PSII-LHCII supercomplexes across the stromal gap, ultimately mediating membrane folding in grana stacks. The supramolecular organization of PSII-LHCII supercomplexes determines the plant thylakoid structure. Here, via structural mass spectrometry, Albanese et al. show how stroma-exposed N-termini of LHCII subunits, interacting with each other in adjacent membranes, can mediate membrane folding in grana stacks.
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Müh F, Zouni A. Structural basis of light-harvesting in the photosystem II core complex. Protein Sci 2020; 29:1090-1119. [PMID: 32067287 PMCID: PMC7184784 DOI: 10.1002/pro.3841] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 02/06/2020] [Accepted: 02/06/2020] [Indexed: 12/20/2022]
Abstract
Photosystem II (PSII) is a membrane-spanning, multi-subunit pigment-protein complex responsible for the oxidation of water and the reduction of plastoquinone in oxygenic photosynthesis. In the present review, the recent explosive increase in available structural information about the PSII core complex based on X-ray crystallography and cryo-electron microscopy is described at a level of detail that is suitable for a future structure-based analysis of light-harvesting processes. This description includes a proposal for a consistent numbering scheme of protein-bound pigment cofactors across species. The structural survey is complemented by an overview of the state of affairs in structure-based modeling of excitation energy transfer in the PSII core complex with emphasis on electrostatic computations, optical properties of the reaction center, the assignment of long-wavelength chlorophylls, and energy trapping mechanisms.
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Affiliation(s)
- Frank Müh
- Department of Theoretical Biophysics, Institute for Theoretical Physics, Johannes Kepler University Linz, Linz, Austria
| | - Athina Zouni
- Humboldt-Universität zu Berlin, Institute for Biology, Biophysics of Photosynthesis, Berlin, Germany
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Pi X, Zhao S, Wang W, Liu D, Xu C, Han G, Kuang T, Sui SF, Shen JR. The pigment-protein network of a diatom photosystem II-light-harvesting antenna supercomplex. Science 2020; 365:365/6452/eaax4406. [PMID: 31371578 DOI: 10.1126/science.aax4406] [Citation(s) in RCA: 113] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Accepted: 06/18/2019] [Indexed: 01/05/2023]
Abstract
Diatoms play important roles in global primary productivity and biogeochemical cycling of carbon, in part owing to the ability of their photosynthetic apparatus to adapt to rapidly changing light intensity. We report a cryo-electron microscopy structure of the photosystem II (PSII)-fucoxanthin (Fx) chlorophyll (Chl) a/c binding protein (FCPII) supercomplex from the centric diatom Chaetoceros gracilis The supercomplex comprises two protomers, each with two tetrameric and three monomeric FCPIIs around a PSII core that contains five extrinsic oxygen-evolving proteins at the lumenal surface. The structure reveals the arrangement of a huge pigment network that contributes to efficient light energy harvesting, transfer, and dissipation processes in the diatoms.
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Affiliation(s)
- Xiong Pi
- State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Songhao Zhao
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.,University of Chinese Academy of Sciences, Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Wenda Wang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Desheng Liu
- State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Caizhe Xu
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.,University of Chinese Academy of Sciences, Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Guangye Han
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Tingyun Kuang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
| | - Sen-Fang Sui
- State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.
| | - Jian-Ren Shen
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. .,Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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Salicylic Acid Protects Photosystem II by Alleviating Photoinhibition in Arabidopsis thaliana under High Light. Int J Mol Sci 2020; 21:ijms21041229. [PMID: 32059402 PMCID: PMC7072977 DOI: 10.3390/ijms21041229] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 02/07/2020] [Accepted: 02/09/2020] [Indexed: 12/19/2022] Open
Abstract
Salicylic acid (SA) is considered to play an important role in plant responses to environmental stresses. However, the detailed protective mechanisms in photosynthesis are still unclear. We therefore explored the protective roles of SA in photosystem II (PSII) in Arabidopsis thaliana under high light. The results demonstrated that 3 h of high light exposure resulted in a decline in photochemical efficiency and the dissipation of excess excitation energy. However, SA application significantly improved the photosynthetic capacity and the dissipation of excitation energy under high light. Western blot analysis revealed that SA application alleviated the decrease in the levels of D1 and D2 protein and increased the amount of Lhcb5 and PsbS protein under high light. Results from photoinhibition highlighted that SA application could accelerate the repair of D1 protein. Furthermore, the phosphorylated levels of D1 and D2 proteins were significantly increased under high light in the presence of SA. In addition, we found that SA application significantly alleviated the disassembly of PSII-LHCII super complexes and LHCII under high light for 3 h. Overall, our findings demonstrated that SA may efficiently alleviate photoinhibition and improve photoprotection by dissipating excess excitation energy, enhancing the phosphorylation of PSII reaction center proteins, and preventing the disassembly of PSII super complexes.
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Huang S, Zuo T, Ni W. Important roles of glycinebetaine in stabilizing the structure and function of the photosystem II complex under abiotic stresses. PLANTA 2020; 251:36. [PMID: 31903497 DOI: 10.1007/s00425-019-03330-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Accepted: 12/14/2019] [Indexed: 05/08/2023]
Abstract
The molecular and physiological mechanisms of glycinebetaine stabilizing photosystem II complex under abiotic stresses are discussed, helping to address food shortage problems threatening the survival of growing population. In the backdrop of climate change, the frequency, dimensions and duration of extreme events have increased sharply, which may have unintended consequences for agricultural. The acclimation of plants to a constantly changing environment involves the accumulation of compatible solutes. Various compatible solutes enable plants to tolerate abiotic stresses, and glycinebetaine (GB) is one of the most-studied. The biosynthesis and accumulation of GB appear in numerous plant species, especially under environmental stresses. The exogenous application of GB and GB-accumulating transgenic plants have been proven to further promote plant development under stresses. Early research on GB focused on the maintenance of osmotic potential in plants. Subsequent experimental evidence demonstrated that it also protects proteins including the photosystem II complex (PSII) from denaturation and deactivation. As reviewed here, multiple experimental evidences have indicated considerable progress in the roles of GB in stabilizing PSII under abiotic stresses. Based on these advances, we've concluded two effects of GB on PSII: (1) it stabilizes the structure of PSII by protecting extrinsic proteins from dissociation or by promoting protein synthesize; (2) it enhances the oxygen-evolving activity of PSII or promotes the repair of the photosynthetic damage of PSII.
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Affiliation(s)
- Shan Huang
- College of Environmental and Resource Sciences, Zhejiang University, Key Laboratory of Agricultural Resource and Environment of Zhejiang Province, Hangzhou, 310058, China
| | - Ting Zuo
- College of Environmental and Resource Sciences, Zhejiang University, Key Laboratory of Agricultural Resource and Environment of Zhejiang Province, Hangzhou, 310058, China
| | - Wuzhong Ni
- College of Environmental and Resource Sciences, Zhejiang University, Key Laboratory of Agricultural Resource and Environment of Zhejiang Province, Hangzhou, 310058, China.
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Pan X, Cao P, Su X, Liu Z, Li M. Structural analysis and comparison of light-harvesting complexes I and II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2019; 1861:148038. [PMID: 31229568 DOI: 10.1016/j.bbabio.2019.06.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 06/04/2019] [Accepted: 06/15/2019] [Indexed: 12/30/2022]
Abstract
Photosynthesis is a fundamental biological process involving the conversion of solar energy into chemical energy. The initial photochemical and photophysical events of photosynthesis are mediated by photosystem II (PSII) and photosystem I (PSI). Both PSII and PSI are multi-subunit supramolecular machineries composed of a core complex and a peripheral antenna system. The antenna system serves to capture light energy and transfer it to the core efficiently. Both PSII and PSI in the green lineage (plants and green algae) and PSI in red algae have an antenna system comprising a series of chlorophyll- and carotenoid-binding membrane proteins belonging to the light-harvesting complex (LHC) superfamily, including LHCII and LHCI. However, the antenna size and subunit composition vary considerably in the two photosystems from diverse organisms. On the basis of the plant and algal LHCII and LHCI structures that have been solved by X-ray crystallography and single-particle cryo-electron microscopy we review the detailed structural features and characteristic pigment properties of these LHCs in PSII and PSI. This article is part of a Special Issue entitled Light harvesting, edited by Dr. Roberta Croce.
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Affiliation(s)
- Xiaowei Pan
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Peng Cao
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Xiaodong Su
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Zhenfeng Liu
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Mei Li
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, PR China.
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Chen J, Chen J, Liu Y, Zheng Y, Zhu Q, Han G, Shen JR. Proton-Coupled Electron Transfer of Plastoquinone Redox Reactions in Photosystem II: A Pump-Probe Ultraviolet Resonance Raman Study. J Phys Chem Lett 2019; 10:3240-3247. [PMID: 31117681 DOI: 10.1021/acs.jpclett.9b00959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Plastoquinones (PQs) act as electron and proton mediators in photosystem II (PSII) for solar-to-chemical energy conversion. It is known that the redox potential of PQ varies in a wide range spanning hundreds of millivolts; however, its structural origin is not known yet. Here, by developing a pump-probe ultraviolet resonance Raman technique, we measured the vibrational structures of PQs including QA and QB in cyanobacterial PSII directly. The conversion of QA to QA•- in the Mn-depleted PSII is verified by direct observation of the distinct QA•- vibrational bands. A frequency upshift of the ring C=O/C=C stretch band at 1565 cm-1 for QA•- was observed, which suggests a π-π interaction between the quinone ring and Trp253. In contrast, proton-coupled reduction of QA to QAH upon light-driven electron transfer is demonstrated in PSII without QB bound. The H-bond between QA and His214 is likely the proton origin of this proton-coupled electron transfer.
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Affiliation(s)
- Jun Chen
- Science and Technology on Surface Physics and Chemistry Laboratory , Jiangyou 621908 , China
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China
| | - Jinfan Chen
- Science and Technology on Surface Physics and Chemistry Laboratory , Jiangyou 621908 , China
| | - Ying Liu
- Institute of Materials , China Academy of Engineering Physics , Mianyang 621907 , China
| | - Yang Zheng
- State Key Laboratory of Catalysis , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China
| | - Qingjun Zhu
- Photosynthesis Research Center, Key Laboratory of Photobiology , Institute of Botany, Chinese Academy of Sciences , No. 20, Nanxincun , Xiangshan, Beijing , 100093 , China
| | - Guangye Han
- Photosynthesis Research Center, Key Laboratory of Photobiology , Institute of Botany, Chinese Academy of Sciences , No. 20, Nanxincun , Xiangshan, Beijing , 100093 , China
| | - Jian-Ren Shen
- Photosynthesis Research Center, Key Laboratory of Photobiology , Institute of Botany, Chinese Academy of Sciences , No. 20, Nanxincun , Xiangshan, Beijing , 100093 , China
- Research Institute of Interdisciplinary Science, Graduate School of Natural Science and Technology , Okayama University , Tsushima Naka 3-1-1 , Okayama 700-8530 , Japan
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Endo K, Kobayashi K, Wang HT, Chu HA, Shen JR, Wada H. Site-directed mutagenesis of two amino acid residues in cytochrome b 559 α subunit that interact with a phosphatidylglycerol molecule (PG772) induces quinone-dependent inhibition of photosystem II activity. PHOTOSYNTHESIS RESEARCH 2019; 139:267-279. [PMID: 30039358 DOI: 10.1007/s11120-018-0555-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 07/07/2018] [Indexed: 06/08/2023]
Abstract
X-ray crystallographic analysis (1.9-Å resolution) of the cyanobacterial photosystem II (PSII) dimer showed the presence of five phosphatidylglycerol (PG) molecules per reaction center. One of the PG molecules, PG772, is located in the vicinity of the QB-binding site. To investigate the role of PG772 in PSII, we performed site-directed mutagenesis in the cytochrome (Cyt) b559 α subunit of Synechocystis sp. PCC 6803 to change two amino acids, Thr-5 and Ser-11, which interact with PG772. The photosynthetic activity of intact cells was slightly lower in all mutants than that of cells in the control strain; however, the oxygen-evolving PSII activity was decreased markedly in cells of mutants, as measured using artificial quinones (such as p-benzoquinone). Furthermore, electron transport from QA to QB was inhibited in mutants incubated with quinones, particularly under high-intensity light conditions. Lipid analysis of purified PSII showed approximately one PG molecule per reaction center, presumably PG772, was lost in the PSII dimer from the T5A and S11A mutants compared with that in the PSII dimer from the control strain. In addition, protein analysis of monomer and dimer showed decreased levels of PsbV and PsbU extrinsic proteins in the PSII monomer purified from T5A and S11A mutants. These results suggest that site-directed mutagenesis of Thr-5 and Ser-11, which presumably causes the loss of PG772, induces quinone-dependent inhibition of PSII activity under high-intensity light conditions and destabilizes the binding of extrinsic proteins to PSII.
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Affiliation(s)
- Kaichiro Endo
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Koichi Kobayashi
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, 153-8902, Japan
| | - Hsing-Ting Wang
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei, 11529, Taiwan, Republic of China
| | - Hsiu-An Chu
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei, 11529, Taiwan, Republic of China
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka, Okayama, 700-8530, Japan
| | - Hajime Wada
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, 153-8902, Japan.
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Yu Y, Zeng Y, Li J, Yang C, Zhang X, Luo F, Dai X. An algicidal Streptomyces amritsarensis strain against Microcystis aeruginosa strongly inhibits microcystin synthesis simultaneously. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 650:34-43. [PMID: 30195130 DOI: 10.1016/j.scitotenv.2018.08.433] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 08/29/2018] [Accepted: 08/31/2018] [Indexed: 06/08/2023]
Abstract
Microcystis aeruginosa and hepatotoxic microcystins produced by it have posed a severe threat to aquatic ecological security and human health. In this study a Streptomyces amritsarensis HG-16, showing high algicidal activity against M. aeruginosa and strong inhibitory effect on microcystin synthesis, was obtained by screening some anti-Fusarium sp. microbial strains isolated before in our laboratory. HG-16 bound cyanobacterial cells by mycelia to form flocs and killed M. aeruginosa by secreting active substances, which were proteinase K resistant and stable in the temperature range of 35-75 °C and pH range of 3-11. HG-16 removed M. aeruginosa of 105 and 106 cell mL-1 cell densities in similar rate and was active against all the tested harmful unicellular and filamentous cyanobacteria. Results of differential gene expression analysis indicated that HG-16 affected the photosynthesis system and microcystin synthesis of M. aeruginosa. Accordingly, the algicidal activity of HG-16 was light-dependent, and microcystin synthesis of M. aeruginosa decreased by 91.2% with HG-16 treatment. Thus, it is promising to utilize HG-16 to mitigate harmful cyanobacterial blooms, inhibit microcystin synthesis and control plant disease caused by Fusarium.spp. through irrigating farmland with eutrophic water applied HG-16.
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Affiliation(s)
- Yan Yu
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Yudie Zeng
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Jing Li
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Caiyun Yang
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Xiaohui Zhang
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Feng Luo
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China.
| | - Xianzhu Dai
- Chongqing Key Laboratory of Bio-resource development for Bioenergy, College of Resources and Environment, Southwest University, Chongqing 400715, China.
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The increase of photosynthetic carbon assimilation as a mechanism of adaptation to low temperature in Lotus japonicus. Sci Rep 2019; 9:863. [PMID: 30696867 PMCID: PMC6351645 DOI: 10.1038/s41598-018-37165-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/25/2018] [Indexed: 11/15/2022] Open
Abstract
Low temperature is one of the most important factors affecting plant growth, it causes an stress that directly alters the photosynthetic process and leads to photoinhibition when severe enough. In order to address the photosynthetic acclimation response of Lotus japonicus to cold stress, two ecotypes with contrasting tolerance (MG-1 and MG-20) were studied. Their chloroplast responses were addressed after 7 days under low temperature through different strategies. Proteomic analysis showed changes in photosynthetic and carbon metabolism proteins due to stress, but differentially between ecotypes. In the sensitive MG-1 ecotype acclimation seems to be related to energy dissipation in photosystems, while an increase in photosynthetic carbon assimilation as an electron sink, seems to be preponderant in the tolerant MG-20 ecotype. Chloroplast ROS generation was higher under low temperature conditions only in the MG-1 ecotype. These data are consistent with alterations in the thylakoid membranes in the sensitive ecotype. However, the accumulation of starch granules observed in the tolerant MG-20 ecotype indicates the maintenance of sugar metabolism under cold conditions. Altogether, our data suggest that different acclimation strategies and contrasting chloroplast redox imbalance could account for the differential cold stress response of both L. japonicus ecotypes.
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Chen Y, Wu N, Mao H, Zhou J, Su Y, Zhang Z, Zhang H, Yuan S. Different toxicities of nanoscale titanium dioxide particles in the roots and leaves of wheat seedlings. RSC Adv 2019; 9:19243-19252. [PMID: 35516862 PMCID: PMC9065167 DOI: 10.1039/c9ra02984b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 06/07/2019] [Indexed: 11/21/2022] Open
Abstract
Despite previous studies on exploring the environmental effects of titanium dioxide nanoparticles particle (nTiO2) on plants, the detailed impacts of nTiO2on the antioxidant system and photosynthesis of plants is still not well understood.
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Affiliation(s)
- Yanger Chen
- College of Life Science
- Sichuan Agricultural University
- Ya'an 625014
- China
| | - Nan Wu
- College of Life Science
- Sichuan Agricultural University
- Ya'an 625014
- China
| | - Haotian Mao
- College of Life Science
- Sichuan Agricultural University
- Ya'an 625014
- China
| | - Jun Zhou
- College of Life Science
- Sichuan Agricultural University
- Ya'an 625014
- China
| | - Yanqiu Su
- College of Life Science
- Sichuan University
- Chengdu 610064
- China
| | - Zhongwei Zhang
- College of Resources
- Sichuan Agricultural University
- Chengdu 611130
- China
| | - Huaiyu Zhang
- College of Life Science
- Sichuan Agricultural University
- Ya'an 625014
- China
| | - Shu Yuan
- College of Resources
- Sichuan Agricultural University
- Chengdu 611130
- China
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41
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Zaharieva I, Dau H. Energetics and Kinetics of S-State Transitions Monitored by Delayed Chlorophyll Fluorescence. FRONTIERS IN PLANT SCIENCE 2019; 10:386. [PMID: 30984228 PMCID: PMC6450259 DOI: 10.3389/fpls.2019.00386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 03/13/2019] [Indexed: 05/21/2023]
Abstract
Understanding energetic and kinetic parameters of intermediates formed in the course of the reaction cycle (S-state cycle) of photosynthetic water oxidation is of high interest and could support the rationale designs of artificial systems for solar fuels. We use time-resolved measurements of the delayed chlorophyll fluorescence to estimate rate constants, activation energies, free energy differences, and to discriminate between the enthalpic and the entropic contributions to the decrease of the Gibbs free energy of the individual transitions. Using a joint-fit simulation approach, kinetic parameters are determined for the reaction intermediates in the S-state transitions in buffers with different pH in H2O and in D2O.
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Affiliation(s)
| | - Holger Dau
- *Correspondence: Ivelina Zaharieva, Holger Dau,
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42
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Goussi R, Manaa A, Derbali W, Ghnaya T, Abdelly C, Barbato R. Combined effects of NaCl and Cd2+ stress on the photosynthetic apparatus of Thellungiella salsuginea. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:1274-1287. [DOI: 10.1016/j.bbabio.2018.10.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 09/24/2018] [Accepted: 10/13/2018] [Indexed: 02/06/2023]
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Yao M, Liu Y, Fei L, Zhou Y, Wang F, Chen J. Self-Adaptable Quinone-Quinol Exchange Mechanism of Photosystem II. J Phys Chem B 2018; 122:10478-10489. [PMID: 30380868 DOI: 10.1021/acs.jpcb.8b09641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The step of plastoquinone (PQ) reduction to plastoquinol (PQH2) can regulate the photoreaction rate of photosystem II (PSII). To experimentally unravel the PQ-PQH2 exchange mechanism of PSII, we investigate the reaction kinetics of plant PSII membranes and the subunits-trimmed PSII core complexes with various PQ analogues and directly probe the reductions of PQ and other quinones by 257 nm resonance Raman scattering. Two phases of quinone concentration effect on the reaction rate originate from the quinone-quinol exchange mechanism. The results indicate that high concentrations of quinone, more than one movable quinone molecule per PSII reaction center, could trigger quinone-quinol exchange adapting to the unidirectional route: quinones enter through channel I and/or III, and quinols leave through channel II. A weak quinone binding site near QB probably plays a crucial role in pushing quinone-quinol exchange forward in the unidirectional route. Our work provides experimental proofs demonstrating a self-adaptable quinone-quinol exchange mechanism of PSII.
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Affiliation(s)
- Mingdong Yao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , China.,Key Laboratory of Systems Bioengineering (Ministry of Education) , Tianjin University , Tianjin 300072 , China
| | - Ying Liu
- Institute of Materials , China Academy of Engineering Physics , Mianyang 621907 , China
| | - Liping Fei
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , China
| | - Ye Zhou
- Key Laboratory of Separation Sciences for Analytical Chemistry, National Chromatographic R&A Center, Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , China
| | - Fangjun Wang
- Key Laboratory of Separation Sciences for Analytical Chemistry, National Chromatographic R&A Center, Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , China
| | - Jun Chen
- Science and Technology on Surface Physics and Chemistry Laboratory , Jiangyou 621908 , China.,State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , China
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44
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Albanese P, Manfredi M, Re A, Marengo E, Saracco G, Pagliano C. Thylakoid proteome modulation in pea plants grown at different irradiances: quantitative proteomic profiling in a non-model organism aided by transcriptomic data integration. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 96:786-800. [PMID: 30118564 DOI: 10.1111/tpj.14068] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 08/03/2018] [Accepted: 08/13/2018] [Indexed: 05/02/2023]
Abstract
Plant thylakoid membranes contain hundreds of proteins that closely interact to cope with ever-changing environmental conditions. We investigated how Pisum sativum L. (pea) grown at different irradiances optimizes light-use efficiency through the differential accumulation of thylakoid proteins. Thylakoid membranes from plants grown under low (LL), moderate (ML) and high (HL) light intensity were characterized by combining chlorophyll fluorescence measurements with quantitative label-free proteomic analysis. Protein sequences retrieved from available transcriptomic data considerably improved thylakoid proteome profiling, increasing the quantifiable proteins from 63 to 194. The experimental approach used also demonstrates that this integrative omics strategy is powerful for unravelling protein isoforms and functions that are still unknown in non-model organisms. We found that the different growth irradiances affect the electron transport kinetics but not the relative abundance of photosystems (PS) I and II. Two acclimation strategies were evident. The behaviour of plants acclimated to LL was compared at higher irradiances: (i) in ML, plants turn on photoprotective responses mostly modulating the PSII light-harvesting capacity, either accumulating Lhcb4.3 or favouring the xanthophyll cycle; (ii) in HL, plants reduce the pool of light-harvesting complex II and enhance the PSII repair cycle. When growing at ML and HL, plants accumulate ATP synthase, boosting both cyclic and linear electron transport by finely tuning the ΔpH across the membrane and optimizing protein trafficking by adjusting the thylakoid architecture. Our results provide a quantitative snapshot of how plants coordinate light harvesting, electron transport and protein synthesis by adjusting the thylakoid membrane proteome in a light-dependent manner.
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Affiliation(s)
- Pascal Albanese
- Applied Science and Technology Department-BioSolar Lab, Politecnico di Torino, Environment Park, Via Livorno 60, 10144, Torino, Italy
| | - Marcello Manfredi
- ISALIT-Department of Science and Technological Innovation, University of Eastern Piedmont, Viale T. Michel 11, 15121, Alessandria, Italy
- Department of Science and Technological Innovation, University of Eastern Piedmont, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Angela Re
- Center for Sustainable Future Technologies-CSFT@POLITO, Istituto Italiano di Tecnologia, Corso Trento 21, 10129, Torino, Italy
| | - Emilio Marengo
- Department of Science and Technological Innovation, University of Eastern Piedmont, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Guido Saracco
- Applied Science and Technology Department-BioSolar Lab, Politecnico di Torino, Environment Park, Via Livorno 60, 10144, Torino, Italy
| | - Cristina Pagliano
- Applied Science and Technology Department-BioSolar Lab, Politecnico di Torino, Environment Park, Via Livorno 60, 10144, Torino, Italy
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45
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Structure, assembly and energy transfer of plant photosystem II supercomplex. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:633-644. [DOI: 10.1016/j.bbabio.2018.03.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/12/2018] [Accepted: 03/12/2018] [Indexed: 12/20/2022]
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46
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Kouřil R, Nosek L, Semchonok D, Boekema EJ, Ilík P. Organization of Plant Photosystem II and Photosystem I Supercomplexes. Subcell Biochem 2018; 87:259-286. [PMID: 29464563 DOI: 10.1007/978-981-10-7757-9_9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
In nature, plants are continuously exposed to varying environmental conditions. They have developed a wide range of adaptive mechanisms, which ensure their survival and maintenance of stable photosynthetic performance. Photosynthesis is delicately regulated at the level of the thylakoid membrane of chloroplasts and the regulatory mechanisms include a reversible formation of a large variety of specific protein-protein complexes, supercomplexes or even larger assemblies known as megacomplexes. Revealing their structures is crucial for better understanding of their function and relevance in photosynthesis. Here we focus our attention on the isolation and a structural characterization of various large protein supercomplexes and megacomplexes, which involve Photosystem II and Photosystem I, the key constituents of photosynthetic apparatus. The photosystems are often attached to other protein complexes in thylakoid membranes such as light harvesting complexes, cytochrome b 6 f complex, and NAD(P)H dehydrogenase. Structural models of individual supercomplexes and megacomplexes provide essential details of their architecture, which allow us to discuss their function as well as physiological significance.
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Affiliation(s)
- Roman Kouřil
- Department of Biophysics, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Olomouc, Czech Republic.
| | - Lukáš Nosek
- Department of Biophysics, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Olomouc, Czech Republic
| | - Dmitry Semchonok
- Electron Microscopy Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, The Netherlands
| | - Egbert J Boekema
- Electron Microscopy Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, The Netherlands
| | - Petr Ilík
- Department of Biophysics, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Olomouc, Czech Republic
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47
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Asada M, Nishimura T, Ifuku K, Mino H. Location of the extrinsic subunit PsbP in photosystem II studied by pulsed electron-electron double resonance. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018. [DOI: 10.1016/j.bbabio.2018.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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48
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Duanmu D, Rockwell NC, Lagarias JC. Algal light sensing and photoacclimation in aquatic environments. PLANT, CELL & ENVIRONMENT 2017; 40:2558-2570. [PMID: 28245058 PMCID: PMC5705019 DOI: 10.1111/pce.12943] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Revised: 02/13/2017] [Accepted: 02/15/2017] [Indexed: 05/05/2023]
Abstract
Anoxygenic photosynthetic prokaryotes arose in ancient oceans ~3.5 billion years ago. The evolution of oxygenic photosynthesis by cyanobacteria followed soon after, enabling eukaryogenesis and the evolution of complex life. The Archaeplastida lineage dates back ~1.5 billion years to the domestication of a cyanobacterium. Eukaryotic algae have subsequently radiated throughout oceanic/freshwater/terrestrial environments, adopting distinctive morphological and developmental strategies for adaptation to diverse light environments. Descendants of the ancestral photosynthetic alga remain challenged by a typical diurnally fluctuating light supply ranging from ~0 to ~2000 μE m-2 s-1 . Such extreme changes in light intensity and variations in light quality have driven the evolution of novel photoreceptors, light-harvesting complexes and photoprotective mechanisms in photosynthetic eukaryotes. This minireview focuses on algal light sensors, highlighting the unexpected roles for linear tetrapyrroles (bilins) in the maintenance of functional chloroplasts in chlorophytes, sister species to streptophyte algae and land plants.
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Affiliation(s)
- Deqiang Duanmu
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
- Corresponding authors: Deqiang Duanmu, State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China. Tel:+86-27-87282101; Fax:+86-27-87282469; ; J. Clark Lagarias, Department of Molecular and Cellular Biology, University of California, Davis CA 95616. Tel: 530-752-1865; Fax: 530-752-3085;
| | - Nathan C. Rockwell
- Department of Molecular and Cellular Biology, University of California, Davis CA 95616
| | - J. Clark Lagarias
- Department of Molecular and Cellular Biology, University of California, Davis CA 95616
- Corresponding authors: Deqiang Duanmu, State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China. Tel:+86-27-87282101; Fax:+86-27-87282469; ; J. Clark Lagarias, Department of Molecular and Cellular Biology, University of California, Davis CA 95616. Tel: 530-752-1865; Fax: 530-752-3085;
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49
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Albanese P, Melero R, Engel BD, Grinzato A, Berto P, Manfredi M, Chiodoni A, Vargas J, Sorzano CÓS, Marengo E, Saracco G, Zanotti G, Carazo JM, Pagliano C. Pea PSII-LHCII supercomplexes form pairs by making connections across the stromal gap. Sci Rep 2017; 7:10067. [PMID: 28855679 PMCID: PMC5577252 DOI: 10.1038/s41598-017-10700-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/14/2017] [Indexed: 12/30/2022] Open
Abstract
In higher plant thylakoids, the heterogeneous distribution of photosynthetic protein complexes is a determinant for the formation of grana, stacks of membrane discs that are densely populated with Photosystem II (PSII) and its light harvesting complex (LHCII). PSII associates with LHCII to form the PSII-LHCII supercomplex, a crucial component for solar energy conversion. Here, we report a biochemical, structural and functional characterization of pairs of PSII-LHCII supercomplexes, which were isolated under physiologically-relevant cation concentrations. Using single-particle cryo-electron microscopy, we determined the three-dimensional structure of paired C2S2M PSII-LHCII supercomplexes at 14 Å resolution. The two supercomplexes interact on their stromal sides through a specific overlap between apposing LHCII trimers and via physical connections that span the stromal gap, one of which is likely formed by interactions between the N-terminal loops of two Lhcb4 monomeric LHCII subunits. Fast chlorophyll fluorescence induction analysis showed that paired PSII-LHCII supercomplexes are energetically coupled. Molecular dynamics simulations revealed that additional flexible physical connections may form between the apposing LHCII trimers of paired PSII-LHCII supercomplexes in appressed thylakoid membranes. Our findings provide new insights into how interactions between pairs of PSII-LHCII supercomplexes can link adjacent thylakoids to mediate the stacking of grana membranes.
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Affiliation(s)
- Pascal Albanese
- Applied Science and Technology Department-BioSolar Lab, Politecnico di Torino, Viale T. Michel 5, 15121, Alessandria, Italy
- Department of Biology, University of Padova, Via Ugo Bassi 58 B, 35121, Padova, Italy
| | - Roberto Melero
- Biocomputing Unit, Centro Nacional de Biotecnología-CSIC, Darwin 3, Cantoblanco, 28049, Madrid, Spain
| | - Benjamin D Engel
- Department of Molecular Structural Biology, Max Planck Institute of Biochemistry, 82152, Martinsried, Germany
| | - Alessandro Grinzato
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58 B, 35121, Padova, Italy
| | - Paola Berto
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58 B, 35121, Padova, Italy
| | - Marcello Manfredi
- ISALIT-Department of Science and Technological Innovation, University of Eastern Piedmont, Viale T. Michel 11, 15121, Alessandria, Italy
- Department of Science and Technological Innovation, University of Eastern Piedmont, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Angelica Chiodoni
- Center for Sustainable Future Technologies - CSFT@POLITO, Istituto Italiano di Tecnologia, Corso Trento 21, 10129, Torino, Italy
| | - Javier Vargas
- Biocomputing Unit, Centro Nacional de Biotecnología-CSIC, Darwin 3, Cantoblanco, 28049, Madrid, Spain
| | | | - Emilio Marengo
- Department of Science and Technological Innovation, University of Eastern Piedmont, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Guido Saracco
- Center for Sustainable Future Technologies - CSFT@POLITO, Istituto Italiano di Tecnologia, Corso Trento 21, 10129, Torino, Italy
| | - Giuseppe Zanotti
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58 B, 35121, Padova, Italy
| | - Jose-Maria Carazo
- Biocomputing Unit, Centro Nacional de Biotecnología-CSIC, Darwin 3, Cantoblanco, 28049, Madrid, Spain
| | - Cristina Pagliano
- Applied Science and Technology Department-BioSolar Lab, Politecnico di Torino, Viale T. Michel 5, 15121, Alessandria, Italy.
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50
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Xuan H, Dai X, Li J, Zhang X, Yang C, Luo F. A Bacillus sp. strain with antagonistic activity against Fusarium graminearum kills Microcystis aeruginosa selectively. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 583:214-221. [PMID: 28104332 DOI: 10.1016/j.scitotenv.2017.01.055] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Revised: 01/09/2017] [Accepted: 01/10/2017] [Indexed: 06/06/2023]
Abstract
Cyanobacterial harmful algal blooms (CyanoHABs) cause severe environmental problems, economic losses and threaten human health seriously. In the present study, a Bacillus sp. strain, designated as AF-1, with strong antagonistic activity against plant pathogenic fungus Fusarium graminearum was isolated from purple soil. Bacillus sp. AF-1 selectively killed Microcystis aeruginosa at low cell density (1.6×103cfu/mL), and showed the strongest bactericidal activity against M. aeruginosa NIES-843 (Ae=93%, t=6d). The algicidal substances originated from strain AF-1 were stable in the temperature range of 35-100°C, and pH range of 3-11. Cell-free filtrate of AF-1 culture caused excessive accumulation of intracellular reactive oxygen species (ROS), cell death and the efflux of intracellular components of M. aeruginosa NIES-843 cells. The expression of genes recA, psbA1, psbD1, rbcL and mcyB, involved in DNA repair, photosynthesis and microcystin synthesis of NIES 843, were significantly influenced by the cell-free filtrate of AF-1 culture. Bacillus sp. AF-1 has the potential to be developed as a bifunctional biocontrol agent to control CyanoHABs and F. graminearum caused plant disease.
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Affiliation(s)
- Huanling Xuan
- Research Center of Bioenergy and Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Xianzhu Dai
- Research Center of Bioenergy and Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400715, China.
| | - Jing Li
- Research Center of Bioenergy and Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Xiaohui Zhang
- Research Center of Bioenergy and Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Caiyun Yang
- Research Center of Bioenergy and Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Feng Luo
- Research Center of Bioenergy and Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400715, China
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