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Kim E, Kawakami K, Sato R, Ishii A, Minagawa J. Photoprotective Capabilities of Light-Harvesting Complex II Trimers in the Green Alga Chlamydomonas reinhardtii. J Phys Chem Lett 2020; 11:7755-7761. [PMID: 32822182 DOI: 10.1021/acs.jpclett.0c02098] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Major light-harvesting complex (LHCII) trimers in plants induce the thermal dissipation of absorbed excitation energy against photooxidative damage under excess light conditions. LHCII trimers in green algae have been thought to be incapable of energy dissipation without additional quencher proteins, although LHCIIs in plants and green algae are homologous. In this study, we investigated the energy-dissipative capabilities of four distinct types of LHCII trimers isolated from the model green alga Chlamydomonas reinhardtii using spectroscopic analysis. Our results revealed that the LHCII trimers possessing LHCII type II (LHCBM5) and LHCII type IV (LHCBM1) had efficient energy-dissipative capabilities, whereas LHCII type I (LHCBM3/4/6/8/9) and type III (LHCBM2/7) did not. On the basis of the amino acid sequences of LHCBM5 and LHCBM1 compared with the other LHCBMs, we propose that positively charged extra N-terminal amino acid residues mediate the interactions between LHCII trimers to form energy-dissipative states.
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Affiliation(s)
- Eunchul Kim
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Keisuke Kawakami
- Research Center for Artificial Photosynthesis, Osaka City University, 3-3-138, Osaka, Japan
| | - Ryoichi Sato
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan
| | - Asako Ishii
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan
| | - Jun Minagawa
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan
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Burton-Smith RN, Watanabe A, Tokutsu R, Song C, Murata K, Minagawa J. Structural determination of the large photosystem II-light-harvesting complex II supercomplex of Chlamydomonas reinhardtii using nonionic amphipol. J Biol Chem 2019; 294:15003-15013. [PMID: 31420447 DOI: 10.1074/jbc.ra119.009341] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 08/14/2019] [Indexed: 02/01/2023] Open
Abstract
In photosynthetic organisms, photosystem II (PSII) is a large membrane protein complex, consisting of a pair of core complexes surrounded by an array of variable numbers of light-harvesting complex (LHC) II proteins. Previously reported structures of the PSII-LHCII supercomplex of the green alga Chlamydomonas reinhardtii exhibit significant structural heterogeneity, but recently improved purification methods employing ionic amphipol A8-35 have enhanced supercomplex stability, providing opportunities for determining a more intact structure. Herein, we present a 5.8 Å cryo-EM map of the C. reinhardtii PSII-LHCII supercomplex containing six LHCII trimers (C2S2M2L2). Utilizing a newly developed nonionic amphipol-based purification and stabilizing method, we purified the largest photosynthetic supercomplex to the highest percentage of the intact configuration reported to date. We found that the interprotein distances within the light-harvesting complex array in the green algal photosystem are larger than those previously observed in higher plants, indicating that the potential route of energy transfer in the PSII-LHCII supercomplex in green algae may be altered. Interestingly, we also observed an asymmetric PSII-LHCII supercomplex structure comprising C2S2M1L1 in the same sample. Moreover, we found a new density adjacent to the PSII core complex, attributable to a single-transmembrane helix. It was previously unreported in the cryo-EM maps of PSII-LHCII supercomplexes from land plants.
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Affiliation(s)
- Raymond N Burton-Smith
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.,Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Saitama 332-0012, Japan
| | - Akimasa Watanabe
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.,Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Saitama 332-0012, Japan.,Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8585, Japan
| | - Ryutaro Tokutsu
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.,Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Saitama 332-0012, Japan.,Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8585, Japan
| | - Chihong Song
- National Institute for Physiological Sciences, Okazaki, Aichi 444-8585, Japan
| | - Kazuyoshi Murata
- National Institute for Physiological Sciences, Okazaki, Aichi 444-8585, Japan .,Department of Physiological Sciences, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8585, Japan
| | - Jun Minagawa
- Division of Environmental Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan .,Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Saitama 332-0012, Japan.,Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8585, Japan
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3
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Kim E, Watanabe A, Sato R, Okajima K, Minagawa J. pH-Responsive Binding Properties of Light-Harvesting Complexes in a Photosystem II Supercomplex Investigated by Thermodynamic Dissociation Kinetics Analysis. J Phys Chem Lett 2019; 10:3615-3620. [PMID: 31180687 DOI: 10.1021/acs.jpclett.9b01208] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Reorganization of photosynthetic proteins on the thylakoid membrane is an important regulatory process for photoacclimation in photosynthetic organisms. However, the underlying mechanism has been poorly understood due to the lack of methods to analyze the interactions between membrane proteins. To investigate the mechanism, we demonstrated the binding properties of light-harvesting complex proteins (LHCs) in a photosystem II (PSII) supercomplex regulated by pH conditions, which primarily responded to environmental light conditions, using a thermodynamic dissociation kinetics analysis. The results showed that the strongly bound LHCs (∼60%) were responsive to pH conditions, whereas the moderately and loosely bound LHCs (∼40%) were nonresponsive. This result implies that the pH condition alters the binding properties of LHCs in the PSII supercomplex, inducing the reorganization of protein complexes.
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Affiliation(s)
- Eunchul Kim
- Division of Environmental Photobiology , National Institute for Basic Biology , Okazaki 444-8585 , Japan
| | - Akimasa Watanabe
- 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
| | - Ryoichi Sato
- Division of Environmental Photobiology , National Institute for Basic Biology , Okazaki 444-8585 , Japan
| | - Keisuke Okajima
- 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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4
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Watanabe A, Kim E, Burton‐Smith RN, Tokutsu R, Minagawa J. Amphipol‐assisted purification method for the highly active and stable photosystem
II
supercomplex of
Chlamydomonas reinhardtii. FEBS Lett 2019; 593:1072-1079. [DOI: 10.1002/1873-3468.13394] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 04/13/2019] [Accepted: 04/18/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Akimasa Watanabe
- Division of Environmental Photobiology National Institute for Basic Biology Okazaki Japan
- Department of Basic Biology School of Life Science SOKENDAI (The Graduate University for Advanced Studies) Okazaki Japan
- Core Research for Evolutional Science and Technology Japan Science and Technology Agency Saitama Japan
| | - Eunchul Kim
- Division of Environmental Photobiology National Institute for Basic Biology Okazaki Japan
| | - Raymond N. Burton‐Smith
- Division of Environmental Photobiology National Institute for Basic Biology Okazaki Japan
- Core Research for Evolutional Science and Technology Japan Science and Technology Agency Saitama Japan
| | - Ryutaro Tokutsu
- Division of Environmental Photobiology National Institute for Basic Biology Okazaki Japan
- Department of Basic Biology School of Life Science SOKENDAI (The Graduate University for Advanced Studies) Okazaki Japan
- Core Research for Evolutional Science and Technology Japan Science and Technology Agency Saitama Japan
| | - Jun Minagawa
- Division of Environmental Photobiology National Institute for Basic Biology Okazaki Japan
- Department of Basic Biology School of Life Science SOKENDAI (The Graduate University for Advanced Studies) Okazaki Japan
- Core Research for Evolutional Science and Technology Japan Science and Technology Agency Saitama Japan
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