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β-カルボキソーム生物生成におけるCcmMによるルビスコ凝縮物形成
1Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Martinsried, Germany.
Nature
|January 25, 2019
まとめ
サイアノバクテリアのカルボキシゾームは,リブルース-1,5-ビスホスファートカルボキシラーゼ/酸素酵素 (Rubisco) とCcmMタンパク質を使用して二酸化炭素を濃縮する. CcmMの調査結果
科学分野:
- 生物化学
- 細胞生物学
- 構造生物学
背景:
- 細胞は酵素を分割して 代謝経路を調節し 効率を高めます
- サイアノバクテリアのカルボキソームには,固定のためにCO2を濃縮するルビスコと炭酸水素が含まれています.
- 2つの形態 (M58とM35) のCcmMタンパク質は,カーボキソーム形成のためのルビスコを集積する.
研究 の 目的:
- ルビスコ-CcmM複合体の形成の構造的基礎と,カルボキソームの生化におけるその役割を解明する.
- CcmMの小さなサブユニットのような (SSUL) モジュールとRubiscoの相互作用を調査する.
主な方法:
- ルビスコ-CcmM複合体の再構成
- 複合体の高解像度構造をX線結晶学または冷凍EMを用いて解く.
- SSULにおける二硫化結合の役割を評価する in vivo 機能検査
主要な成果:
- CcmMのSSULモジュールは,Rubiscoの赤道領域に結合し,分子をつなぎ,液体のような相分離を引き起こします.
- 以前の仮説とは異なり,SSULモジュールはRubisco小サブユニット (RbcS) を置き換えるものではありません.
- SSUL内の二硫化結合形成は,ネットワークの柔軟性を高め, in vivo 炭酸体機能に不可欠です.
結論:
- ルビスコは,CcmMのSSULドメインとのダイナミックな相互作用によって,カルボキシソーム内で液体のようなマトリックスを形成する.
- この液体-液体相分離のメカニズムは,低複雑性の配列に依存する真核系と異なる.
- 植物におけるCO2濃縮メカニズムを設計するには,カーボキソームの生体生成を理解することが重要です.
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