論文

2022年12月

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

Nature Communications
  • Koji Kato
  • Ryo Nagao
  • Yoshifumi Ueno
  • Makio Yokono
  • Takehiro Suzuki
  • Tian-Yi Jiang
  • Naoshi Dohmae
  • Fusamichi Akita
  • Seiji Akimoto
  • Naoyuki Miyazaki
  • Jian-Ren Shen
  • 全て表示

13
1
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41467-022-29303-7
出版者・発行元
Springer Science and Business Media LLC

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.

リンク情報
DOI
https://doi.org/10.1038/s41467-022-29303-7
URL
https://www.nature.com/articles/s41467-022-29303-7.pdf
URL
https://www.nature.com/articles/s41467-022-29303-7
ID情報
  • DOI : 10.1038/s41467-022-29303-7
  • eISSN : 2041-1723

エクスポート
BibTeX RIS