Structure of a tetrameric photosystem I from a glaucophyte alga Cyanophora paradoxa

Koji Kato, Ryo Nagao (), Yoshifumi Ueno, Makio Yokono, Takehiro Suzuki, Tian-Yi Jiang, Naoshi Dohmae, Fusamichi Akita, Seiji Akimoto, Naoyuki Miyazaki () and Jian-Ren Shen ()
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Koji Kato: Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
Ryo Nagao: Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
Yoshifumi Ueno: Graduate School of Science, Kobe University
Makio Yokono: Institute of Low Temperature Science, Hokkaido University
Takehiro Suzuki: 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
Naoshi Dohmae: Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science
Fusamichi Akita: Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University
Seiji Akimoto: Graduate School of Science, Kobe University
Naoyuki Miyazaki: 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

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: 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-Å 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°, 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.

Date: 2022
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DOI: 10.1038/s41467-022-29303-7

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