Theoretical study on the mechanism of light energy transfer in photosynthetic systems
| Project/Area Number |
17K05757
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Kyoto University (2018-2020)
University of the Ryukyus (2017) |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 光捕集アンテナ / 励起エネルギー移動 / 分子シミュレーション / 光合成色素 / 光捕集複合体 / 理論解析 / LH2 / バクテリオクロロフィル / FMOタンパク / 光合成 / 光エネルギー伝達 / 理論計算 |
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| Outline of Final Research Achievements |
The purpose of this study is to clarify the correlation between the light energy transfer function of the light-harvesting antenna and the protein structure and fluctuation by utilizing our original method. First, the excitation energies of the pigments in the light-harvesting antenna and the excitonic couplings between the pigments were analyzed, and the calculated results were in good agreement with the experimental results. The analysis of the light energy transfer dynamics revealed that the energy transfer is accelerated by the difference in the excitation energy fluctuations of the pigments located in different protein environments. The relaxation process of photosynthetic pigment from highly excited states was also analyzed, and it was found that ligands play an important role.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、光捕集アンテナが内部に含まれる色素の励起エネルギーの揺らぎを最適化することで効率的なエネルギー伝達を実現していることを明らかにした。さらに、極低温よりも室温で揺らぎを最適化していることも明らかにしている。これらの研究成果は、これまで解析が困難だった揺らぎの役割を初めて明らかにしたものであり、学術的意義は大きいと考えられる。今後、本研究で得られた成果が人工光合成や太陽電池などの分子設計の指針となることも期待される。
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Report
(5 results)
Research Products
(31 results)
