ジャーナル: Cell / 年: 2024 タイトル: Diatom pyrenoids are encased in a protein shell that enables efficient CO fixation. 著者: Ginga Shimakawa / Manon Demulder / Serena Flori / Akihiro Kawamoto / Yoshinori Tsuji / Hermanus Nawaly / Atsuko Tanaka / Rei Tohda / Tadayoshi Ota / Hiroaki Matsui / Natsumi Morishima / ...著者: Ginga Shimakawa / Manon Demulder / Serena Flori / Akihiro Kawamoto / Yoshinori Tsuji / Hermanus Nawaly / Atsuko Tanaka / Rei Tohda / Tadayoshi Ota / Hiroaki Matsui / Natsumi Morishima / Ryosuke Okubo / Wojciech Wietrzynski / Lorenz Lamm / Ricardo D Righetto / Clarisse Uwizeye / Benoit Gallet / Pierre-Henri Jouneau / Christoph Gerle / Genji Kurisu / Giovanni Finazzi / Benjamin D Engel / Yusuke Matsuda / 要旨: Pyrenoids are subcompartments of algal chloroplasts that increase the efficiency of Rubisco-driven CO fixation. Diatoms fix up to 20% of global CO, but their pyrenoids remain poorly characterized. ...Pyrenoids are subcompartments of algal chloroplasts that increase the efficiency of Rubisco-driven CO fixation. Diatoms fix up to 20% of global CO, but their pyrenoids remain poorly characterized. Here, we used in vivo photo-crosslinking to identify pyrenoid shell (PyShell) proteins, which we localized to the pyrenoid periphery of model pennate and centric diatoms, Phaeodactylum tricornutum and Thalassiosira pseudonana. In situ cryo-electron tomography revealed that pyrenoids of both diatom species are encased in a lattice-like protein sheath. Single-particle cryo-EM yielded a 2.4-Å-resolution structure of an in vitro TpPyShell1 lattice, which showed how protein subunits interlock. T. pseudonana TpPyShell1/2 knockout mutants had no PyShell sheath, altered pyrenoid morphology, and a high-CO requiring phenotype, with reduced photosynthetic efficiency and impaired growth under standard atmospheric conditions. The structure and function of the diatom PyShell provide a molecular view of how CO is assimilated in the ocean, a critical ecosystem undergoing rapid change.
名称: T. pseudonana / タイプ: cell / ID: 1 / 親要素: 0 / 詳細: Pyrenoid in T. pseudonana chloroplast
由来(天然)
生物種: Thalassiosira pseudonana (珪藻)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
電子線トモグラフィー法
試料の集合状態
cell
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試料調製
緩衝液
pH: 7
凍結
凍結剤: ETHANE
切片作成
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 3 / 集束イオンビーム - 電流: 0.03 / 集束イオンビーム - 時間: 600 / 集束イオンビーム - 温度: 83 K / 集束イオンビーム - Initial thickness: 1000 / 集束イオンビーム - 最終 厚さ: 150 集束イオンビーム - 詳細: The value given for _em_focused_ion_beam.instrument is FEI Aquilos II. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 平均電子線量: 2.0 e/Å2