ジャーナル: Cell / 年: 2024 タイトル: A protein blueprint of the diatom CO-fixing organelle. 著者: Onyou Nam / Sabina Musiał / Manon Demulder / Caroline McKenzie / Adam Dowle / Matthew Dowson / James Barrett / James N Blaza / Benjamin D Engel / Luke C M Mackinder / 要旨: Diatoms are central to the global carbon cycle. At the heart of diatom carbon fixation is an overlooked organelle called the pyrenoid, where concentrated CO is delivered to densely packed Rubisco. ...Diatoms are central to the global carbon cycle. At the heart of diatom carbon fixation is an overlooked organelle called the pyrenoid, where concentrated CO is delivered to densely packed Rubisco. Diatom pyrenoids fix approximately one-fifth of global CO, but the protein composition of this organelle is largely unknown. Using fluorescence protein tagging and affinity purification-mass spectrometry, we generate a high-confidence spatially defined protein-protein interaction network for the diatom pyrenoid. Within our pyrenoid interaction network are 10 proteins with previously unknown functions. We show that six of these form a shell that encapsulates the Rubisco matrix and is critical for pyrenoid structural integrity, shape, and function. Although not conserved at a sequence or structural level, the diatom pyrenoid shares some architectural similarities to prokaryotic carboxysomes. Collectively, our results support the convergent evolution of pyrenoids across the two main plastid lineages and uncover a major structural and functional component of global CO fixation.
名称: T. pseudonana shell4 KO / タイプ: cell / ID: 1 / 親要素: 0
由来(天然)
生物種: T. 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: 7.5
凍結
凍結剤: ETHANE / 装置: FEI VITROBOT MARK II
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: 30 / 集束イオンビーム - 電流: 20 / 集束イオンビーム - 時間: 1 / 集束イオンビーム - 温度: 93 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 Aquilos 2. 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
TFS KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 平均電子線量: 2.0 e/Å2