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Kim E, Kubota-Kawai H, Kawai F, Yokono M, Minagawa J. Conformation of Light-Harvesting Complex II Trimer Depends upon Its Binding Site. J Phys Chem B 2022; 126:5855-5865. [PMID: 35920883 DOI: 10.1021/acs.jpcb.2c04061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The light-harvesting complex II (LHCII) trimer in plants functions as a major antenna complex and a quencher to protect it from photooxidative damage. Theoretical studies on the structure of an LHCII trimer have demonstrated that excitation energy transfer between chlorophylls (Chls) in LHCII can be modulated by its exquisite conformational fluctuation. However, conformational changes depending on its binding location have not yet been investigated, even though reorganization of protein complexes occurs by physiological regulations. In this study, we investigated conformational differences in LHCII by comparing published structures of an identical LHCII trimer in the three different photosystem supercomplexes from the green alga Chlamydomonas reinhardtii. Our results revealed distinct differences in Chl configurations as well as polypeptide conformations of the LHCII trimers depending on its binding location. We propose that these configurational differences readily modulate the function of LHCII and possibly lead to a change in excitation-energy flow over the photosynthetic supercomplex.
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Affiliation(s)
- Eunchul Kim
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.,Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies, Okazaki 444-8585, Japan
| | | | - Fumihiro Kawai
- Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
| | - Makio Yokono
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.,Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies, Okazaki 444-8585, Japan
| | - Jun Minagawa
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.,Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies, Okazaki 444-8585, Japan
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2
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Kaňa R, Kotabová E, Kopečná J, Trsková E, Belgio E, Sobotka R, Ruban AV. Violaxanthin inhibits nonphotochemical quenching in light-harvesting antenna of Chromera velia. FEBS Lett 2016; 590:1076-85. [PMID: 26988983 DOI: 10.1002/1873-3468.12130] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 02/24/2016] [Accepted: 02/26/2016] [Indexed: 01/01/2023]
Abstract
Non-photochemical quenching (NPQ) is a photoprotective mechanism in light-harvesting antennae. NPQ is triggered by chloroplast thylakoid lumen acidification and is accompanied by violaxanthin de-epoxidation to zeaxanthin, which further stimulates NPQ. In the present study, we show that violaxanthin can act in the opposite direction to zeaxanthin because an increase in the concentration of violaxanthin reduced NPQ in the light-harvesting antennae of Chromera velia. The correlation overlapped with a similar relationship between violaxanthin and NPQ as observed in isolated higher plant light-harvesting complex II. The data suggest that violaxanthin in C. velia can act as an inhibitor of NPQ, indicating that violaxanthin has to be removed from the vicinity of the protein to reach maximal NPQ.
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Affiliation(s)
- Radek Kaňa
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic.,Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic
| | - Eva Kotabová
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic.,Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic
| | - Jana Kopečná
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic
| | - Eliška Trsková
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic.,Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic
| | - Erica Belgio
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic.,School of Biological and Chemical Sciences, Queen Mary University of London, UK
| | - Roman Sobotka
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic.,Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic
| | - Alexander V Ruban
- School of Biological and Chemical Sciences, Queen Mary University of London, UK
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3
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Duffy CDP, Valkunas L, Ruban AV. Quantum Mechanical Calculations of Xanthophyll–Chlorophyll Electronic Coupling in the Light-Harvesting Antenna of Photosystem II of Higher Plants. J Phys Chem B 2013; 117:7605-14. [DOI: 10.1021/jp4025848] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. D. P. Duffy
- School of Biological and Chemical
Sciences, Queen Mary College, University of London, Mile End, Bancroft Road, London, E1 4NS, United Kingdom
| | - L. Valkunas
- Theoretical Physics Department,
Faculty of Physics, Vilnius University,
Saulėteko al. 9, LT-10222 Vilnius, Lithuania
- Center for Physical Sciences and Technology, Savanorių 231, LT-02300
Vilnius, Lithuania
| | - A. V. Ruban
- School of Biological and Chemical
Sciences, Queen Mary College, University of London, Mile End, Bancroft Road, London, E1 4NS, United Kingdom
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4
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Wei X, Chen J, Xie Q, Zhang S, Ge L, Qiao X. Distinct photolytic mechanisms and products for different dissociation species of ciprofloxacin. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:4284-4290. [PMID: 23548166 DOI: 10.1021/es400425b] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
As many antibiotics are ionizable and may have different dissociation forms in the aquatic environment, we hypothesized that the different dissociation species have disparate photolytic pathways, products, and kinetics, and adopted ciprofloxacin (CIP) as a case to test this hypothesis. Simulated sunlight experiments and matrix calculations were performed to differentiate the photolytic reactivity for each dissociation species (H4CIP(3+), H3CIP(2+), H2CIP(+), HCIP(0), and CIP(-)). The results prove that the five dissociation species do have dissimilar photolytic kinetics and products. H4CIP(3+) mainly undergoes stepwise cleavage of the piperazine ring, while H2CIP(+) mainly undergoes defluorination. For H3CIP(2+), HCIP(0), and CIP(-), the major photolytic pathway is oxidation. By density functional theory calculation, we clarified the defluorination mechanisms for the five dissociation species at the excited triplet states: All the five species can defluorinate by reaction with hydroxide ions (OH(-)) to form hydroxylated products, and H2CIP(+) can also undergo C-F bond cleavage to produce F(-) and a carbon-centered radical. This study is a first attempt to differentiate the photolytic products and mechanisms for different dissociation species of ionizable compounds. The results imply that for accurate ecological risk assessment of ionizable emerging pollutants, it is necessary to investigate the environmental photochemical behavior of all dissociation species.
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Affiliation(s)
- Xiaoxuan Wei
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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5
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Ilioaia C, Duffy CDP, Johnson MP, Ruban AV. Changes in the Energy Transfer Pathways within Photosystem II Antenna Induced by Xanthophyll Cycle Activity. J Phys Chem B 2013; 117:5841-7. [DOI: 10.1021/jp402469d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cristian Ilioaia
- Institut de
Biologie et de Technologie
de Saclay, CEA Saclay, 91191 Gif/Yvette
Cedex, France
| | - Christopher D. P. Duffy
- School of
Biological and Chemical
Sciences, Queen Mary University of London, Mile End, Bancroft Road, London E1 4NS, United Kingdom
| | - Matthew P. Johnson
- Department of Molecular Biology
and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, United Kingdom
| | - Alexander V. Ruban
- School of
Biological and Chemical
Sciences, Queen Mary University of London, Mile End, Bancroft Road, London E1 4NS, United Kingdom
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6
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Duffy CDP, Valkunas L, Ruban AV. Light-harvesting processes in the dynamic photosynthetic antenna. Phys Chem Chem Phys 2013; 15:18752-70. [DOI: 10.1039/c3cp51878g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Duffy CDP, Chmeliov J, Macernis M, Sulskus J, Valkunas L, Ruban AV. Modeling of Fluorescence Quenching by Lutein in the Plant Light-Harvesting Complex LHCII. J Phys Chem B 2012; 117:10974-86. [DOI: 10.1021/jp3110997] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- C. D. P. Duffy
- The School of Biological and
Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, U.K
| | - J. Chmeliov
- Theoretical Physics Department,
Faculty of Physics, Vilnius University,
Saulėteko al. 9, LT-10222 Vilnius, Lithuania
- Institute of Physics, Center for Physical Sciences and Technology, Gostauto
11, LT-01108 Vilnius, Lithuania
| | - M. Macernis
- Theoretical Physics Department,
Faculty of Physics, Vilnius University,
Saulėteko al. 9, LT-10222 Vilnius, Lithuania
- Institute of Physics, Center for Physical Sciences and Technology, Gostauto
11, LT-01108 Vilnius, Lithuania
| | - J. Sulskus
- Theoretical Physics Department,
Faculty of Physics, Vilnius University,
Saulėteko al. 9, LT-10222 Vilnius, Lithuania
| | - L. Valkunas
- Theoretical Physics Department,
Faculty of Physics, Vilnius University,
Saulėteko al. 9, LT-10222 Vilnius, Lithuania
- Institute of Physics, Center for Physical Sciences and Technology, Gostauto
11, LT-01108 Vilnius, Lithuania
| | - A. V. Ruban
- The School of Biological and
Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, U.K
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