ID | 63369 |
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Kato, Koji
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
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Nagao, Ryo
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
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Ueno, Yoshifumi
Graduate School of Science, Kobe University
Yokono, Makio
Institute of Low Temperature Science, Hokkaido University
Suzuki, Takehiro
Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science
Tian-Yi, Jiang
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
Dohmae, Naoshi
Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science
Akita, Fusamichi
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
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Akimoto, Seiji
Graduate School of Science, Kobe University
Miyazaki, Naoyuki
Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance (TARA), University of Tsukuba
Jian-Ren, Shen
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
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Abstract | Photosystem I (PSI) is one of the two photosystems functioning in light-energy harvesting, transfer, and electron transfer in photosynthesis. However, the oligomerization state of PSI is variable among photosynthetic organisms. We present a 3.8-angstrom resolution cryo-electron microscopic structure of tetrameric PSI isolated from the glaucophyte alga Cyanophora paradoxa, which reveals differences with PSI from other organisms in subunit composition and organization. The PSI tetramer is organized in a dimer of dimers with a C2 symmetry. Unlike cyanobacterial PSI tetramers, two of the four monomers are rotated around 90 degrees, resulting in a completely different pattern of monomer-monomer interactions. Excitation-energy transfer among chlorophylls differs significantly between Cyanophora and cyanobacterial PSI tetramers. These structural and spectroscopic features reveal characteristic interactions and excitation-energy transfer in the Cyanophora PSI tetramer, suggesting that the Cyanophora PSI could represent a turning point in the evolution of PSI from prokaryotes to eukaryotes.
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Published Date | 2022-03-30
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Publication Title |
Nature Communications
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Volume | volume13
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Issue | issue1
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Publisher | Nature Portfolio
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Start Page | 1679
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ISSN | 2041-1723
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NCID | AA12645905
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Content Type |
Journal Article
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language |
English
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OAI-PMH Set |
岡山大学
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Copyright Holders | © The Author(s) 2022
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File Version | publisher
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Related Url | isVersionOf https://doi.org/10.1038/s41467-022-29303-7
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License | http://creativecommons.org/licenses/by/4.0/
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