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「光合成を支える葉緑素aとbの共存理由を解明」
E Kim, D Lee, S Sakamoto, J-Y Jo, M Vargas, A Ishizaki, J Minagawa, H Kim
"Network analysis with quantum dynamics clarifies why photosystem II exploits both chlorophyll a and b"
Science Advances 11(19) 2025年5月9日
論文リンク：https://doi.org/10.1126/sciadv.ads0327
▸ 概要
植物が光合成を行うために必要な色素「葉緑素a」と「葉緑素b」がなぜ共存しているのか、長年の謎が解明されました。
本研究は、日本大学の金恩哲助教（元：自然科学研究機構・基礎生物学研究所）、自然科学研究機構・基礎生物学研究所の皆川純教授、同・分子科学研究所／東京大学の石崎章仁教授、韓国エネルギー工科大学のKim Heetae准教授らの国際共同研究チームによる成果です。光化学系II（Photosystem II）における葉緑素aとbの共存が、光エネルギーを効率的かつ安全に利用するためであることを発見しました。ネットワーク解析と量子力学計算を組み合わせ、光エネルギーの流れをシミュレーションすることで、自然な葉緑素比がエネルギーの過剰流入を防ぐ安全弁として働くことを明らかにしました。
▸ 研究の意義と展望
本研究は、植物が光環境に適応する進化の利点を示すとともに、光合成を効率化する技術開発にもつながる可能性があります。
図の説明： PSII-LHCII超複合体をネットワーク構造としてモデル化し、クロロフィル間のエネルギー伝達ダイナミックスを分析した研究模式図。
Environmental effect of Heat by NPQ
Environmental effect of Heat by NPQ
A Murakami, E Kim, J Minagawa, K Takizawa
"How much heat does non-photochemical quenching produce?"
Frontiers in Plant Science, 15, 1367795, 2024
https://doi.org/10.3389/fpls.2024.1367795
Stable PSI-PSII megacomplex in Rice
Stable PSI-PSII megacomplex in Rice
E Kim, M Yokono, K Tsugane, A Ishii, C Noda, J Minagawa
"Formation of a stable PSI-PSII megacomplex in rice that conducts energy spillover. "
Plant and Cell Physiology, 64 (8), 858-865, 2023
https://doi.org/10.1093/pcp/pcad037
Commentary by Prof. K Ifuku
"Diversity of the PSI–PSII Megacomplexes That Conduct Energy Spillover in Green Plants"
https://doi.org/10.1093/pcp/pcad069
LHCII conformation
LHCII conformation
E Kim*, H Kubota-Kawai, F Kawai, M Yokono, J Minagawa* (*corresponding authors)
"Conformation of Light-Harvesting Complex II Trimer Depends upon Its Binding Site"
The Journal of Physical Chemistry B, 126 (31), 5855-5865, 2022
https://doi.org/10.1021/acs.jpcb.2c04061
PSII array
PSII array
E Kim, A Watanabe, CDP Duffy, AV Ruban, J Minagawa
"Multimeric and monomeric photosystem II supercomplexes represent structural adaptations to low-and high-light conditions"
Journal of Biological Chemistry, 295 (43), 14537-14545, 2020 (Selected as Editors' Picks)
https://doi.org/10.1074/jbc.RA120.014198
NPQ of CrLHCII
NPQ of CrLHCII
E Kim, K Kawakami, R Sato, A Ishii, J Minagawa
"Photoprotective Capabilities of Light-Harvesting Complex II Trimers in the Green Alga Chlamydomonas reinhardtii"
The Journal of Physical Chemistry Letters, 11 (18), 7755-7761, 2020
https://doi.org/10.1021/acs.jpclett.0c02098
LHCII interaction - pH
LHCII interaction - pH
E Kim*, A Watanabe, R Sato, K Okajima, J Minagawa* (*corresponding authors)
"pH-responsive binding properties of light-harvesting complexes in a photosystem II supercomplex investigated by thermodynamic dissociation kinetics analysis"
The Journal of Physical Chemistry Letters, 10 (13), 3615–3620, 2019
https://doi.org/10.1021/acs.jpclett.9b01208
TDiK assay
TDiK assay
E Kim, R Tokutsu, J Minagawa
"Investigation on the Thermodynamic Dissociation Kinetics of Photosystem II Supercomplexes to Determine the Binding Strengths of Light-Harvesting Complexes"
The Journal of Physical Chemistry B, 122 (5), 1627–1630, 2018
https://doi.org/10.1021/acs.jpcb.7b12417
NPQ of LHCSR3
NPQ of LHCSR3
E Kim, S Akimoto, R Tokutsu, M Yokono, J Minagawa
"Fluorescence lifetime analyses reveal how the high light-responsive protein LHCSR3 transforms PSII light-harvesting complexes into an energy-dissipative state"
Journal of Biological Chemistry, 292 (46), 18951–18960, 2017
https://doi.org/10.1074/jbc.M117.805192
State transition - imaging
State transition - imaging
E Kim, TK Ahn, S Kumazaki
"Changes in Antenna Sizes of Photosystems during State Transitions in Granal and Stroma-Exposed Thylakoid Membrane of Intact Chloroplasts in Arabidopsis Mesophyll Protoplasts"
Plant and Cell Physiology, 56 (4), 759–768, 2015 (Selected as Highlight)
https://doi.org/10.1093/pcp/pcv004
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