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Opatíková M, Semchonok DA, Kopečný D, Ilík P, Pospíšil P, Ilíková I, Roudnický P, Zeljković SĆ, Tarkowski P, Kyrilis FL, Hamdi F, Kastritis PL, Kouřil R. Cryo-EM structure of a plant photosystem II supercomplex with light-harvesting protein Lhcb8 and α-tocopherol. NATURE PLANTS 2023; 9:1359-1369. [PMID: 37550369 DOI: 10.1038/s41477-023-01483-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 07/04/2023] [Indexed: 08/09/2023]
Abstract
The heart of oxygenic photosynthesis is the water-splitting photosystem II (PSII), which forms supercomplexes with a variable amount of peripheral trimeric light-harvesting complexes (LHCII). Our knowledge of the structure of green plant PSII supercomplex is based on findings obtained from several representatives of green algae and flowering plants; however, data from a non-flowering plant are currently missing. Here we report a cryo-electron microscopy structure of PSII supercomplex from spruce, a representative of non-flowering land plants, at 2.8 Å resolution. Compared with flowering plants, PSII supercomplex in spruce contains an additional Ycf12 subunit, Lhcb4 protein is replaced by Lhcb8, and trimeric LHCII is present as a homotrimer of Lhcb1. Unexpectedly, we have found α-tocopherol (α-Toc)/α-tocopherolquinone (α-TQ) at the boundary between the LHCII trimer and the inner antenna CP43. The molecule of α-Toc/α-TQ is located close to chlorophyll a614 of one of the Lhcb1 proteins and its chromanol/quinone head is exposed to the thylakoid lumen. The position of α-Toc in PSII supercomplex makes it an ideal candidate for the sensor of excessive light, as α-Toc can be oxidized to α-TQ by high-light-induced singlet oxygen at low lumenal pH. The molecule of α-TQ appears to shift slightly into the PSII supercomplex, which could trigger important structure-functional modifications in PSII supercomplex. Inspection of the previously reported cryo-electron microscopy maps of PSII supercomplexes indicates that α-Toc/α-TQ can be present at the same site also in PSII supercomplexes from flowering plants, but its identification in the previous studies has been hindered by insufficient resolution.
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Affiliation(s)
- Monika Opatíková
- Department of Biophysics, Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Dmitry A Semchonok
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
| | - David Kopečný
- Department of Experimental Biology, Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Petr Ilík
- Department of Biophysics, Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Pavel Pospíšil
- Department of Biophysics, Faculty of Science, Palacký University, Olomouc, Czech Republic
| | - Iva Ilíková
- Institute of Experimental Botany of the Czech Academy of Sciences, Centre of Plant Structural and Functional Genomics, Olomouc, Czech Republic
| | - Pavel Roudnický
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Sanja Ćavar Zeljković
- Czech Advanced Technology and Research Institute, Palacký University, Olomouc, Czech Republic
- Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Genetic Resources for Vegetables, Medicinal and Special Plants, Crop Research Institute, Olomouc, Czech Republic
| | - Petr Tarkowski
- Czech Advanced Technology and Research Institute, Palacký University, Olomouc, Czech Republic
- Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Genetic Resources for Vegetables, Medicinal and Special Plants, Crop Research Institute, Olomouc, Czech Republic
| | - Fotis L Kyrilis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
| | - Farzad Hamdi
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
| | - Panagiotis L Kastritis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
- Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
- Institute of Chemical Biology, National Hallenic Research Foundation, Athens, Greece
| | - Roman Kouřil
- Department of Biophysics, Faculty of Science, Palacký University, Olomouc, Czech Republic.
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Surówka E, Potocka I, Dziurka M, Wróbel-Marek J, Kurczyńska E, Żur I, Maksymowicz A, Gajewska E, Miszalski Z. Tocopherols mutual balance is a key player for maintaining Arabidopsis thaliana growth under salt stress. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 156:369-383. [PMID: 33007531 DOI: 10.1016/j.plaphy.2020.09.008] [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: 05/22/2020] [Accepted: 09/07/2020] [Indexed: 05/26/2023]
Abstract
Enhanced channeling carbon through pathways: shikimate/chorismate, benzenoid-phenylopropanoid or 2-C-methyl-D-erythritol 4-phosphate (MEP) provides a multitude of secondary metabolites and cell wall components and allows plants response to environmental stresses. Through the biosynthetic pathways, different secondary metabolites, like tocopherols (TCs), are bind to mutual dependencies and metabolic loops, that are not yet fully understood. We compared, in parallel, the influence of α- and γ-TCs on metabolites involved in osmoprotective/antioxidative response, and physico-chemical modification of plasma membrane and cell wall. We studied Arabidopsis thaliana Columbia ecotype (WT), mutant vte1 deficient in α- and γ-TCs, mutant vte4 over-accumulating γ-TC instead of α-TC, and transgenic line tmt over-accumulating α-TC; exposed to NaCl. The results indicate that salt stress activates β-carboxylation processes in WT plants and in plants with altered TCs accumulation. In α-TC-deficient plants, NaCl causes ACC decrease, but does not change SA, whose concentration remains higher than in α-TC accumulating plants. α/γ-TCs contents influence carbohydrates, poliamines, phenolic (caffeic, ferrulic, cinnamic) acids accumulation patterns. Salinity results in increased detection of the LM5 galactan and LM19 homogalacturonan epitopes in α-TC accumulating plants, and the LM6 arabinan and MAC207 AGP epitopes in α-TC deficient mutants. Parallel, plants with altered TCs composition show decreased both the cell turgor and elastic modulus determined at the individual cell level. α-TC deficient plants reveal lower values of cell turgor and elastic modulus, but higher cell hydraulic conductivity than α-TC accumulating plants. Under salt stress, α-TC shows stronger regulatory effect than γ-TC through the impact on chloroplastic biosynthetic pathways and ROS/osmotic-modulating compounds.
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Affiliation(s)
- Ewa Surówka
- The Franciszek Górski Institute of Plant Physiology of the Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Kraków, Poland.
| | - Izabela Potocka
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40-032, Katowice, Poland.
| | - Michał Dziurka
- The Franciszek Górski Institute of Plant Physiology of the Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Kraków, Poland
| | - Justyna Wróbel-Marek
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40-032, Katowice, Poland
| | - Ewa Kurczyńska
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40-032, Katowice, Poland.
| | - Iwona Żur
- The Franciszek Górski Institute of Plant Physiology of the Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Kraków, Poland
| | - Anna Maksymowicz
- The Franciszek Górski Institute of Plant Physiology of the Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Kraków, Poland
| | - Ewa Gajewska
- Department of Plant Physiology and Biochemistry, Faculty of Biology and Environmental Protection, University of Łódź, Banacha 12/16, 90-237, Łódź, Poland
| | - Zbigniew Miszalski
- The Franciszek Górski Institute of Plant Physiology of the Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Kraków, Poland
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Gonçalves AC, Schwantes D, Braga de Sousa RF, Benetoli da Silva TR, Guimarães VF, Campagnolo MA, Soares de Vasconcelos E, Zimmermann J. Phytoremediation capacity, growth and physiological responses of Crambe abyssinica Hochst on soil contaminated with Cd and Pb. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 262:110342. [PMID: 32250818 DOI: 10.1016/j.jenvman.2020.110342] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 02/01/2020] [Accepted: 02/24/2020] [Indexed: 06/11/2023]
Abstract
The search for vegetal species regarding effectiveness in the phytoremediation of soils is of great importance, mainly in function of the great environmental problems, such as soil contamination with heavy metals, the necessity of producing more food, among others that mankind face today. This work aimed (i) to evaluate phytoremediation capacity of Crambe abyssinica Hochst and its growth in soil artificially contaminated with Cd and Pb, and (ii) to evaluate the possible impacts of crambe cultivation in contaminated soil conditions, in order to evaluate, to test, and to question the Brazilian CONAMA 420, providing important information that can be useful for governmental and environmental purposes. Two simultaneous experiments were developed, one for each metal. The soils were contaminated with salts of CdCl2 and PbCl2H2O in five doses based on the investigation values (IV) of CONAMA Resolution 420, resulting in 0; 1.5; 3; 9 and 30 mg kg-1 for Cd and 33; 90; 180; 540 and 1800 mg kg-1 for Pb. Gaseous exchange, development, nutritional composition and production of plant components, as well as phytoavailability of metals, were evaluated. The contamination with metals reduced photosynthesis, increased breathing as well as leading to a negative effect on the mineral nutrition and productivity in general; Plants cultivated in soil with Cd presented higher phytoavailability when compared to those cultivated in the Pb conditions, being found metals in all parts of the crambe plants from 1.5 mg kg- 1 of Cd in the soil; and Pb was retained only in roots, not being translocated in the plant. Cd showed higher phytoavailability, being found in all parts of the plant and Pb was retained only in the roots. Cd showed a higher phytoavailability when compared to Pb, also being found in all parts of crambe plants from dose 1.5 mg kg-1 of Cd in soil, which is an environmental problem, since in these concentrations the cultivation of crops is allowed by Brazilian legislation CONAMA 420.
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Affiliation(s)
- Affonso Celso Gonçalves
- Universidade Estadual do Oeste do Paraná (UNIOESTE), CNPq Scientific Productivity Fellowship, Pernambuco Street, 1777 - Centro, Marechal Cândido Rondon, State of Paraná, 85960-000, Brazil.
| | - Daniel Schwantes
- Departamento de Ciencias Vegetales, Facultad de Agronomía e Ing. Forestal, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Macul, Región Metropolitana, Chile.
| | - Ricardo Felipe Braga de Sousa
- Universidade Estadual do Oeste do Paraná (UNIOESTE), Pernambuco Street, 1777 - Centro, Marechal Cândido Rondon, State of Paraná, 85960-000, Brazil.
| | - Tiago Roque Benetoli da Silva
- Universidade Estadual de Maringá (UEM), CNPq Scientific Productivity Fellowship, Av. Ângelo Moreira da Fonseca, 1800 - Parque Danielle, Umuarama, State of Paraná, 87506-370, Brazil.
| | - Vandeir Francisco Guimarães
- Universidade Estadual do Oeste do Paraná (UNIOESTE), CNPq Scientific Productivity Fellowship, Pernambuco Street, 1777 - Centro, Marechal Cândido Rondon, State of Paraná, 85960-000, Brazil.
| | - Marcelo Angelo Campagnolo
- Educational College of Medianeira (UDC-Medianeira), Rio Branco Street, 1820, Centro, Medianeira, State of Paraná, 85884-000, Brazil.
| | - Edmar Soares de Vasconcelos
- Universidade Estadual do Oeste do Paraná (UNIOESTE), Pernambuco Street, 1777 - Centro, Marechal Cândido Rondon, State of Paraná, 85960-000, Brazil
| | - Juliano Zimmermann
- Universidade Estadual do Oeste do Paraná (UNIOESTE), Pernambuco Street, 1777 - Centro, Marechal Cândido Rondon, State of Paraná, 85960-000, Brazil.
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