- EMDB-12749: In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomon... -
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基本情報
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データベース: EMDB / ID: EMD-12749
タイトル
In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell
マップデータ
In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell (bin4). A denoised version of this tomogram is included in the bundle.
ジャーナル: Cell / 年: 2017 タイトル: The Eukaryotic CO-Concentrating Organelle Is Liquid-like and Exhibits Dynamic Reorganization. 著者: Elizabeth S Freeman Rosenzweig / Bin Xu / Luis Kuhn Cuellar / Antonio Martinez-Sanchez / Miroslava Schaffer / Mike Strauss / Heather N Cartwright / Pierre Ronceray / Jürgen M Plitzko / ...著者: Elizabeth S Freeman Rosenzweig / Bin Xu / Luis Kuhn Cuellar / Antonio Martinez-Sanchez / Miroslava Schaffer / Mike Strauss / Heather N Cartwright / Pierre Ronceray / Jürgen M Plitzko / Friedrich Förster / Ned S Wingreen / Benjamin D Engel / Luke C M Mackinder / Martin C Jonikas / 要旨: Approximately 30%-40% of global CO fixation occurs inside a non-membrane-bound organelle called the pyrenoid, which is found within the chloroplasts of most eukaryotic algae. The pyrenoid matrix is ...Approximately 30%-40% of global CO fixation occurs inside a non-membrane-bound organelle called the pyrenoid, which is found within the chloroplasts of most eukaryotic algae. The pyrenoid matrix is densely packed with the CO-fixing enzyme Rubisco and is thought to be a crystalline or amorphous solid. Here, we show that the pyrenoid matrix of the unicellular alga Chlamydomonas reinhardtii is not crystalline but behaves as a liquid that dissolves and condenses during cell division. Furthermore, we show that new pyrenoids are formed both by fission and de novo assembly. Our modeling predicts the existence of a "magic number" effect associated with special, highly stable heterocomplexes that influences phase separation in liquid-like organelles. This view of the pyrenoid matrix as a phase-separated compartment provides a paradigm for understanding its structure, biogenesis, and regulation. More broadly, our findings expand our understanding of the principles that govern the architecture and inheritance of liquid-like organelles.
EMPIAR-10694 (タイトル: In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell (tilt series) Data size: 5.8 Data #1: Phase-flipped and aligned tilt series of a pyrenoid inside a Chlamydomonas reinhardtii cell [tilt series])
ダウンロード / ファイル: emd_12749.map.gz / 形式: CCP4 / 大きさ: 762.2 MB / タイプ: IMAGE STORED AS SIGNED INTEGER (2 BYTES)
注釈
In situ cryo-electron tomogram of a pyrenoid inside a Chlamydomonas reinhardtii cell (bin4). A denoised version of this tomogram is included in the bundle.
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 kV / 集束イオンビーム - 電流: 0.03 nA / 集束イオンビーム - 時間: 1800 sec. / 集束イオンビーム - 温度: 91 K / 集束イオンビーム - Initial thickness: 8000 nm / 集束イオンビーム - 最終 厚さ: 300 nm 集束イオンビーム - 詳細: See https://bio-protocol.org/e1575 for detailed procedure.. The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Quanta FIB. This is not in a list ...集束イオンビーム - 詳細: See https://bio-protocol.org/e1575 for detailed procedure.. The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Quanta FIB. 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 K2 BASE (4k x 4k) 平均露光時間: 1.0 sec. / 平均電子線量: 2.0 e/Å2
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
C2レンズ絞り径: 70.0 µm / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm / 倍率(公称値): 42000