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

Autor: Kato K; Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Nagao R; Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan. nagaoryo@okayama-u.ac.jp., Ueno Y; Graduate School of Science, Kobe University, Hyogo, 657-8501, Japan., Yokono M; Institute of Low Temperature Science, Hokkaido University, Hokkaido, 060-0819, Japan., Suzuki T; Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, Saitama, 351-0198, Japan., Jiang TY; Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Dohmae N; Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, Saitama, 351-0198, Japan., Akita F; Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Akimoto S; Graduate School of Science, Kobe University, Hyogo, 657-8501, Japan., Miyazaki N; Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Ibaraki, 305-8577, Japan. naomiyazaki@gmail.com., Shen JR; Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan. shen@cc.okayama-u.ac.jp.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2022 Mar 30; Vol. 13 (1), pp. 1679. Date of Electronic Publication: 2022 Mar 30.
DOI: 10.1038/s41467-022-29303-7
Abstrakt: 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.
(© 2022. The Author(s).)
Databáze: MEDLINE
Externí odkaz: